SAN / Banco Santander, S.A. - Depositary Receipt (Common Stock) - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Banco Santander, S.A. - Depositary Receipt (Common Stock)
US ˙ NYSE ˙ US05964H1059

Mga Batayang Estadistika
LEI 5493006QMFDDMYWIAM13
CIK 891478
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Banco Santander, S.A. - Depositary Receipt (Common Stock)
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
September 4, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2025 Commission File Number: 001-12518 Banco Santander, S

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal execut

August 29, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

August 28, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

August 21, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

August 18, 2025 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on August 29, 2025, pursuant to the provisions of Rule 12d2-2 (a).

August 14, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

August 7, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

August 1, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

July 31, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 31, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 30, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

q22025earningspresentati FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.

July 30, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

q22025pr FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal ex

July 30, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

q22025earningspresentati FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.

July 30, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 30, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 23, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 1, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 1, 2025 EX-1.7

Banco Santander, S.A. announces tender offer results

Exhibit 1.7 Banco Santander, S.A. announces tender offer results = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 1 July 2025 - Further to its announcements on 24 June 2025, Banco Santander, S.A. (the "Offeror") now announces the final results of its invitations made to the holders of its outstanding EUR 1,500,000,000 4.375 per cent. Non-Step-Up

July 1, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 1, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 1, 2025 CB/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB/A TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM (Amendment No. 2)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB/A TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM (Amendment No. 2) Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to file this Form: Securities Act Rule 801 (Rights Offering) ☐ Securities Act Rule 802 (Exchange Offer) ☐ Exchange Act Rule 13e-4(h)(8) (Issuer Tender Offer) ☒ E

June 24, 2025 EX-1.1

IMPORTANT NOTICE

Exhibit 1.1 Notice to U.S. Investors: The proposed transaction relates to the securities of Banco Santander, S.A., a company incorporated in Spain. Information distributed in connection with the proposed transaction is subject to Spanish disclosure requirements that are different from those of the United States. It may be difficult for you to enforce your rights and any claim you may have arising

June 24, 2025 F-X

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM F-X APPOINTMENT OF AGENT FOR SERVICE OF PROCESS AND UNDERTAKING

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM F-X APPOINTMENT OF AGENT FOR SERVICE OF PROCESS AND UNDERTAKING A. Name of issuer or person filing (“Filer”): Banco Santander, S.A. B. (1) This is [check one]: [X] An original filing for the Filer [ ] An amended filing for the Filer (2) A filer may also file the Form F-X in paper under a hardship exemption provided by Reg

June 24, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

June 24, 2025 CB/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB/A TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM (Amendment No. 1)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB/A TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM (Amendment No. 1) Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to file this Form: Securities Act Rule 801 (Rights Offering) ☐ Securities Act Rule 802 (Exchange Offer) ☐ Exchange Act Rule 13e-4(h)(8) (Issuer Tender Offer) ☒ E

June 24, 2025 CB

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to file this Form: Securities Act Rule 801 (Rights Offering) ☐ Securities Act Rule 802 (Exchange Offer) ☐ Exchange Act Rule 13e-4(h)(8) (Issuer Tender Offer) ☒ Exchange Act Rule 14d

June 24, 2025 EX-1.3

Headline: "TENDER: Banco Santander, S.A. announces tender offer"

Exhibit 1.3 Headline: "TENDER: Banco Santander, S.A. announces tender offer" = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 24 June 2025 - Banco Santander, S.A. (the "Offeror") announces that it is inviting holders of its outstanding EUR 1,500,000,000 4.375 per cent. Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1

June 24, 2025 EX-1.5

24 June 2025 - Banco Santander, S.A. (the "

Exhibit 1.5 24 June 2025 - Banco Santander, S.A. (the "Offeror") announces today, with reference to the invitations made to the holders of its outstanding EUR 1,500,000,000 4.375 per cent. Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities (ISIN: XS2102912966) (the "Preferred Securities") as described in the tender offer memorandum dated 24 June 2025 (the "Tend

June 24, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

June 10, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

June 3, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

May 29, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 28, 2025 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on June 09, 2025, pursuant to the provisions of Rule 12d2-2 (a).

May 22, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 14, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 7, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 7, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 5, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 5, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 5, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

April 30, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 30, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 30, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 30, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 30, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 29, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 28, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 23, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 23, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 11, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 4, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 4, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 3, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

March 27, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

March 24, 2025 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on April 04, 2025, pursuant to the provisions of Rule 12d2-2 (a).

March 20, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

March 13, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

March 6, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

March 3, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2025 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

February 28, 2025 EX-12.1

Section 302 Certification

Exhibit 12.1 Section 302 Certification I, Héctor Grisi, certify that: 1. I have reviewed this annual report on Form 20-F of Banco Santander, S.A.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading wi

February 28, 2025 EX-97.1

ANNEX: FINANCIAL STATEMENT COMPENSATION RECOUPMENT

Exhibit 97.1 ANNEX: FINANCIAL STATEMENT COMPENSATION RECOUPMENT This Annex provides for the recoupment of certain executive compensation in the event of an accounting restatement resulting from material noncompliance with financial reporting requirements under U.S. federal securities laws in accordance with the terms and conditions set forth herein. Banco Santander S.A. (hereinafter, “the Group” o

February 28, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 28, 2025 EX-11.1

CODE OF CONDUCT IN THE SECURITIES MARKETS Santander Group

Code of Conduct in the Securities Markets Exhibit 11.1 CODE OF CONDUCT IN THE SECURITIES MARKETS Santander Group 1 Code of Conduct in the Securities Markets TABLE OF CONTENTS 1 INTRODUCTION 3 2 APPLICATION CRITERIA IN THE USE OF INSIDE INFORMATION 7 3 APPLICATION CRITERIA IN OWN-ACCOUNT DEALING 11 4 APPLICATION CRITERIA IN KNOWLEDGE AND TRAINING 16 5 GOVERNANCE 16 6 CONTROLS AND EVIDENCE 16 7 OWNE

February 28, 2025 20-F

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F (Mark One) ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHA

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F (Mark One) ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ending 31 December 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1

February 28, 2025 EX-2.2

DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Description of American Depositary Shares

Exhibit 2.2 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Description of American Depositary Shares The following description of Banco Santander’s American depositary shares (the “ADSs”) is a summary and does not purport to be complete. It is subject to and qualified in its entirety by reference to the amended and restated depos

February 28, 2025 EX-15.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Exhibit 15.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form F-3 (No. 333-271955) and on Form S-8 (No. 333-285208, No. 333-278095, No. 333-269251, No. 333-262484, No. 333-256936, No. 333-238260, No. 333-231568 and 333-227289) of Banco Santander, S.A. of our report dated February 28, 2025 relating to

February 28, 2025 EX-12.2

Section 302 Certification

Exhibit 12.2 Section 302 Certification I, José G. Cantera, certify that: 1.I have reviewed this annual report on Form 20-F of Banco Santander, S.A.; 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading w

February 28, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 28, 2025 EX-1.1

BYLAWS OF BANCO SANTANDER, S.A. CHAPTER I. THE COMPANY AND ITS CAPITAL Section 1. Name of the Company

Exhibit 1.1 BYLAWS OF BANCO SANTANDER, S.A. CHAPTER I. THE COMPANY AND ITS CAPITAL Section 1. Name of the Company Article 1. Corporate name The name of the Company is BANCO SANTANDER, S.A. (hereinafter, the “Bank” or the “Company”). The Bank was founded in the city for which it was named, by means of a public instrument executed on 3 March 1856 before notary public Mr. José Dou Martínez; such publ

February 28, 2025 EX-12.3

Section 302 Certification

Exhibit 12.3 Section 302 Certification I, José Doncel, certify that: 1.I have reviewed this annual report on Form 20-F of Banco Santander, S.A.; 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with

February 28, 2025 EX-13.1

Section 906 Certification

Exhibit 13.1 Section 906 Certification The certification set forth below is being submitted in connection with the Annual Report on Form 20-F for the year ended 31 December 2024 (the “Report”) for the purpose of complying with Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code. Héctor Gri

February 27, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

6-K 1 dp2254196k.htm FORM 6-K FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain

February 25, 2025 EX-99.3

Banco Santander, S.A. Buyouts Procedure

EXHIBIT 99.3 Banco Santander, S.A. Buyouts Procedure Banco Santander, S.A.’s (the “Bank” or “Banco Santander”) remuneration system includes the delivery of shares of the Bank or of rights thereon or that are linked to the price of the Bank´s shares, the (immediate or deferred) delivery of shares of the Bank within the framework of the application of the Group’s buyout regulations which have been a

February 25, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 25, 2025 EX-99.2

REGULATIONS FOR THE NINTH CYCLE OF THE DEFERRED MULTIYEAR OBJECTIVES VARIABLE REMUNERATION PLAN

Exhibit 99.2 Confidential This document is a translation of an original text in Spanish. In case of any discrepancy between both texts, the Spanish version will prevail. REGULATIONS FOR THE NINTH CYCLE OF THE DEFERRED MULTIYEAR OBJECTIVES VARIABLE REMUNERATION PLAN Contents 1. INTRODUCTION 1 2. SUBJECTIVE SCOPE AND PURPOSE 2 3. SETTING THE AWARD 3 4. FUNCTIONING OF THE PLAN 8 5. DELIVERY OF SHARES

February 25, 2025 EX-99.1

REGULATIONS FOR THE FOURTEENTH CYCLE OF THE DEFERRED AND CONDITIONAL VARIABLE REMUNERATION PLAN

Exhibit 99.1 Confidential This document is a translation of an original text in Spanish. In case of any discrepancy between both texts, the Spanish version will prevail. REGULATIONS FOR THE FOURTEENTH CYCLE OF THE DEFERRED AND CONDITIONAL VARIABLE REMUNERATION PLAN Contents 1. INTRODUCTION 1 2. SUBJECTIVE SCOPE AND PURPOSE 2 3. SETTING THE AWARD 2 4. FUNCTIONING OF THE PLAN 4 5. DELIVERY OF SHARES

February 25, 2025 EX-FILING FEES

CALCULATION OF FILING FEE TABLES BANCO SANTANDER, S.A. Table 1: Newly Registered and Carry Forward Securities

Ex-Filing Fees CALCULATION OF FILING FEE TABLES S-8 BANCO SANTANDER, S.A. Table 1: Newly Registered and Carry Forward Securities Line Item Type Security Type Security Class Title Notes Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Newly Registered Securities Fees to be Paid Equity Shares of Capit

February 25, 2025 S-8

As filed with the Securities and Exchange Commission on February 25, 2025

As filed with the Securities and Exchange Commission on February 25, 2025 Registration No.

February 20, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 14, 2025 6-K/A

FORM 6-K/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander,

FORM 6-K/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal execu

February 13, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 13, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 12, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 6, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 5, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 5, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 5, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 5, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 5, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

January 29, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2025 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

January 23, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2025 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

January 23, 2025 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20459 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 Banco Santander, S.A. (Exact name of registra

8-A12B UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20459 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Kingdom of Spain None (State of incorporation or organization) (I.R.S. Employer Identification No.) Ciudad Grup

January 21, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2025 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

January 17, 2025 EX-4.1

BANCO SANTANDER, S.A. as Issuer, THE BANK OF NEW YORK MELLON, London Branch as Trustee and Principal Paying Agent THE BANK OF NEW YORK MELLON SA/NV, Luxembourg Branch as Senior Non Preferred Debt Securities Registrar SECOND SUPPLEMENTAL INDENTURE dat

Exhibit 4.1 BANCO SANTANDER, S.A. as Issuer, THE BANK OF NEW YORK MELLON, London Branch as Trustee and Principal Paying Agent and THE BANK OF NEW YORK MELLON SA/NV, Luxembourg Branch as Senior Non Preferred Debt Securities Registrar SECOND SUPPLEMENTAL INDENTURE dated as of January 17, 2025 to SENIOR NON PREFERRED DEBT SECURITIES INDENTURE dated as of March 14, 2024 SECOND SUPPLEMENTAL INDENTURE (

January 17, 2025 EX-1.1

BANCO SANTANDER, S.A. (a company with limited liability organized under the laws of The Kingdom of Spain) U.S.$1,000,000,000 5.565% Senior Non Preferred Fixed Rate Notes due 2030 U.S.$1,000,000,000 6.033% Senior Non Preferred Fixed Rate Notes due 203

Exhibit 1.1 Execution Version BANCO SANTANDER, S.A. (a company with limited liability organized under the laws of The Kingdom of Spain) U.S.$1,000,000,000 5.565% Senior Non Preferred Fixed Rate Notes due 2030 U.S.$1,000,000,000 6.033% Senior Non Preferred Fixed Rate Notes due 2035 UNDERWRITING AGREEMENT January 7, 2025 BofA Securities, Inc. One Bryant Park New York, NY 10036 Citigroup Global Marke

January 17, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of January, 2025. Commission File Number: 001-

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of January, 2025. Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Add

January 16, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2025 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

January 15, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of January, 2025. Commission File Number: 001-

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of January, 2025. Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Add

January 8, 2025 424B5

Banco Santander, S.A. $1,000,000,000 5.565% Senior Non Preferred Fixed Rate Notes due 2030 $1,000,000,000 6.033% Senior Non Preferred Fixed Rate Notes due 2035

Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-271955 PROSPECTUS SUPPLEMENT (to prospectus dated May 16, 2023) $2,000,000,000 Banco Santander, S.A. $1,000,000,000 5.565% Senior Non Preferred Fixed Rate Notes due 2030 $1,000,000,000 6.033% Senior Non Preferred Fixed Rate Notes due 2035 We are offering $1,000,000,000 principal amount of 5.565% Senior Non Preferred Fixed Rate Notes d

January 8, 2025 FWP

PRICING TERM SHEET U.S.$1,000,000,000 5.565% Senior Non Preferred Fixed Rate Notes due 2030 (the “SNP 2030 Fixed Rate Notes”)

FWP 1 dp223232fwp.htm FORM FWP Filed Pursuant to Rule 433 Registration No. 333-271955 Dated: January 7, 2025 PRICING TERM SHEET U.S.$1,000,000,000 5.565% Senior Non Preferred Fixed Rate Notes due 2030 (the “SNP 2030 Fixed Rate Notes”) Issuer: Banco Santander, S.A. Series Number: SNP-241 Issuer Ratings*: A2 (Positive) / A+ (Stable) / A- (Stable) by Moody’s/S&P/Fitch Expected Notes Ratings*: Baa1 /

January 8, 2025 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Banco Santander, S.A. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Tables 424(b)(5) ………….. (Form Type) Banco Santander, S.A. …………………………………………………….. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Regis

January 7, 2025 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of January, 2025. Commission File Number: 001-

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of January, 2025. Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Add

January 7, 2025 424B5

Subject to Completion Preliminary Prospectus Supplement dated January 7, 2025

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-271955 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities nor do they seek an offer to buy these securities in any jurisdiction where the offer or sale is not per

January 2, 2025 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2025 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2025 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

December 23, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

December 19, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

December 11, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

December 4, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

November 29, 2024 6-K

FORM 6-K

6-K 1 dp2213916k.htm FORM 6-K FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of November, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain

November 21, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of November, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of November, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

November 14, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of November, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of November, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

November 7, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of November, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of November, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

October 31, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

October 29, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

October 29, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

October 29, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

October 29, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

October 24, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

October 22, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

October 17, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

October 16, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

October 10, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

October 9, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

October 3, 2024 6-K

FORM 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of October, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

September 30, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal execut

September 26, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal execut

September 24, 2024 6-K

FORM 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal execut

September 23, 2024 6-K

FORM 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal execut

September 19, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal execut

September 12, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal execut

September 10, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal execut

September 5, 2024 6-K

FORM 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal execut

September 3, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S

6-K 1 dp2174876k.htm FORM 6-K FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of September, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spai

August 27, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of August, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

August 8, 2024 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20459 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 Banco Santander, S.A. (Exact name of registra

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20459 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Kingdom of Spain (State of incorporation or organization) None (I.R.S. Employer Identification No.) Ciudad Grupo Santa

August 1, 2024 EX-1.1

BANCO SANTANDER, S.A. (a company with limited liability organized under the laws of The Kingdom of Spain) U.S.$1,500,000,000 8.000% Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities UNDERWRITING AGREEMENT

Exhibit 1.1 Execution Version BANCO SANTANDER, S.A. (a company with limited liability organized under the laws of The Kingdom of Spain) U.S.$1,500,000,000 8.000% Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities UNDERWRITING AGREEMENT July 29, 2024 Barclays Capital Inc. 745 Seventh Avenue New York, NY 10019 BofA Securities, Inc. One Bryant Park New York, NY 10

August 1, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August, 2024 Commission File Number: 001-12

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August, 2024 Commission File Number: 001-12518 BANCO SANTANDER, S.A. Ciudad Grupo Santander 28660 Boadilla del Monte Madrid Spain (Address of principal executive offices) Indicate by check mark

August 1, 2024 EX-4.1

BANCO SANTANDER, S.A. as Issuer, THE BANK OF NEW YORK MELLON, London Branch as Trustee, Paying and Conversion Agent, Calculation Agent and Principal Paying Agent THE BANK OF NEW YORK MELLON SA/NV, Luxembourg Branch as Contingent Convertible Capital S

Exhibit 4.1 BANCO SANTANDER, S.A. as Issuer, THE BANK OF NEW YORK MELLON, London Branch as Trustee, Paying and Conversion Agent, Calculation Agent and Principal Paying Agent and THE BANK OF NEW YORK MELLON SA/NV, Luxembourg Branch as Contingent Convertible Capital Securities Registrar SECOND SUPPLEMENTAL INDENTURE dated as of August 1, 2024 to CONTINGENT CONVERTIBLE CAPITAL SECURITIES INDENTURE da

July 30, 2024 424B5

Banco Santander, S.A. $1,500,000,000 8.000% Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-271955 PROSPECTUS SUPPLEMENT (to prospectus dated May 16, 2023) Banco Santander, S.A. $1,500,000,000 8.000% Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities The $1,500,000,000 8.000% Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities of $200,

July 30, 2024 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Banco Santander, S.A. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation  or Carry Forward Rule Amount Registered

EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables 424(b)(5) (Form Type) Banco Santander, S.

July 30, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 30, 2024 FWP

PRICING TERM SHEET U.S.$1,500,000,000 8.000% Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities (the “Notes”)

Filed Pursuant to Rule 433 Registration No. 333-271955 Dated: July 29, 2024 PRICING TERM SHEET U.S.$1,500,000,000 8.000% Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities (the “Notes”) Issuer: Banco Santander, S.A. Legal Entity Identifier: 5493006QMFDDMYWIAM13 Issuer Ratings*: A2 (Positive) / A+ (Stable) / A- (Stable) by Moody’s/S&P/Fitch Expected Securities R

July 29, 2024 424B5

Subject to Completion Preliminary Prospectus Supplement dated July 29, 2024

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-271955 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities nor do they seek an offer to buy these securities in any jurisdiction where the offer or sale is not per

July 26, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 26, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 24, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 24, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

6-K 1 financieroq224ingles.htm 6-K FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spai

July 24, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 24, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 19, 2024 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20459 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20459 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Kingdom of Spain (State of incorporation or organization) None (I.R.S. Employer Identification No.) Ciudad Grupo Santa

July 17, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 15, 2024 EX-1.1

BANCO SANTANDER, S.A. (a company with limited liability organized under the laws of The Kingdom of Spain) U.S.$750,000,000 Senior Preferred Callable Floating Rate Notes due 2028 U.S.$1,500,000,000 5.365% Senior Preferred Callable Fixed-to-Fixed Rate

Exhibit 1.1 BANCO SANTANDER, S.A. (a company with limited liability organized under the laws of The Kingdom of Spain) U.S.$750,000,000 Senior Preferred Callable Floating Rate Notes due 2028 U.S.$1,500,000,000 5.365% Senior Preferred Callable Fixed-to-Fixed Rate Notes due 2028 U.S.$1,500,000,000 5.439% Senior Preferred Fixed Rate Notes due 2031 UNDERWRITING AGREEMENT July 8, 2024 Barclays Capital I

July 15, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July, 2024 Commission File Number: 001-1251

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July, 2024 Commission File Number: 001-12518 BANCO SANTANDER, S.A. Ciudad Grupo Santander 28660 Boadilla del Monte Madrid Spain (Address of principal executive offices) Indicate by check mark w

July 15, 2024 EX-4.1

BANCO SANTANDER, S.A. as Issuer, THE BANK OF NEW YORK MELLON, London Branch as Trustee, Calculation Agent and Principal Paying Agent THE BANK OF NEW YORK MELLON SA/NV, Luxembourg Branch as Senior Preferred Debt Securities Registrar THIRD SUPPLEMENTAL

Exhibit 4.1 BANCO SANTANDER, S.A. as Issuer, THE BANK OF NEW YORK MELLON, London Branch as Trustee, Calculation Agent and Principal Paying Agent and THE BANK OF NEW YORK MELLON SA/NV, Luxembourg Branch as Senior Preferred Debt Securities Registrar THIRD SUPPLEMENTAL INDENTURE dated as of July 15, 2024 to SENIOR PREFERRED DEBT SECURITIES INDENTURE dated as of August 8, 2023 THIRD SUPPLEMENTAL INDEN

July 9, 2024 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Banco Santander, S.A. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables 424(b)(5) (Form Type) Banco Santander, S.

July 9, 2024 424B5

Banco Santander, S.A. $750,000,000 Senior Preferred Callable Floating Rate Notes due 2028 $1,500,000,000 5.365% Senior Preferred Callable Fixed-to-Fixed Rate Notes due 2028 $1,500,000,000 5.439% Senior Preferred Fixed Rate Notes due 2031

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-271955 PROSPECTUS SUPPLEMENT (to prospectus dated May 16, 2023) $3,750,000,000 Banco Santander, S.A. $750,000,000 Senior Preferred Callable Floating Rate Notes due 2028 $1,500,000,000 5.365% Senior Preferred Callable Fixed-to-Fixed Rate Notes due 2028 $1,500,000,000 5.439% Senior Preferred Fixed Rate Notes due 2031 W

July 9, 2024 FWP

PRICING TERM SHEET U.S.$750,000,000 Senior Preferred Callable Floating Rate Notes due 2028 (the “SP 2028 Floating Rate Notes”)

Filed Pursuant to Rule 433 Registration No. 333-271955 Dated: July 8, 2024 PRICING TERM SHEET U.S.$750,000,000 Senior Preferred Callable Floating Rate Notes due 2028 (the “SP 2028 Floating Rate Notes”) Issuer: Banco Santander, S.A. Series Number: SP-229 Issuer Ratings*: A2 (Positive) / A+ (Stable) / A- (Stable) by Moody’s/S&P/Fitch Expected Notes Ratings*: A2 / A+ / A (Moody’s / S&P / Fitch) Statu

July 8, 2024 424B5

Subject to Completion Preliminary Prospectus Supplement dated July 8, 2024

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-271955 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities nor do they seek an offer to buy these securities in any jurisdiction where the offer or sale is not per

July 3, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 2, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of July, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

July 1, 2024 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on July 12, 2024, pursuant to the provisions of Rule 12d2-2 (a).

June 27, 2024 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on July 08, 2024, pursuant to the provisions of Rule 12d2-2 (a).

June 24, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

June 18, 2024 6-K

FORM 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

June 13, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

June 6, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of June, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive o

May 30, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 24, 2024 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on June 04, 2024, pursuant to the provisions of Rule 12d2-2 (a).

May 23, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 17, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 16, 2024 EX-1.7

Banco Santander, S.A. announces tender offer results

Exhibit 1.7 Banco Santander, S.A. announces tender offer results = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 16 May 2024 - Further to its announcements on 7 May 2024, Banco Santander, S.A. (the “Offeror”) now announces the final results of its invitations made to the holders of its outstanding EUR 1,500,000,000 4.75 per cent. Non-Step-Up No

May 16, 2024 CB/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB/A TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM (Amendment No. 1)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB/A TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM (Amendment No. 1) Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to file this Form: Securities Act Rule 801 (Rights Offering) ☐ Securities Act Rule 802 (Exchange Offer) ☐ Exchange Act Rule 13e-4(h)(8) (Issuer Tender Offer) ☒ E

May 16, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 14, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 8, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (E

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive of

May 7, 2024 CB

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM

CB UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to file this Form: Securities Act Rule 801 (Rights Offering) ☐ Securities Act Rule 802 (Exchange Offer) ☐ Exchange Act Rule 13e-4(h)(8) (Issuer Tender Offer) ☒ Exchange Act Rule

May 7, 2024 F-X

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM F-X APPOINTMENT OF AGENT FOR SERVICE OF PROCESS AND UNDERTAKING A. Name of issuer or person filing (“Filer”): Banco Santander, S.A. B. (1)   This is an (check one): ☒   orig

F-X UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM F-X APPOINTMENT OF AGENT FOR SERVICE OF PROCESS AND UNDERTAKING A. Name of issuer or person filing (“Filer”): Banco Santander, S.A. B. (1)   This is an (check one): ☒   original filing for the Filer ☐   amended filing for the Filer (2)   Check the following box if you are filing the Form F-X in paper in accordance wit

May 7, 2024 EX-1.3

Headline: “TENDER: Banco Santander, S.A. announces tender offer”

EX-1.3 Exhibit 1.3 Headline: “TENDER: Banco Santander, S.A. announces tender offer” 7 May 2024—Banco Santander, S.A. (the “Offeror”) announces that it is inviting holders of its outstanding EUR 1,500,000,000 4.75 per cent. Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities (ISIN: XS1793250041) (the “Preferred Securities”) to tender their Preferred Securities fo

May 7, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (E

Table of Contents FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of prin

May 7, 2024 CB/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB/A TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM (Amendment No. 1)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form CB/A TENDER OFFER/RIGHTS OFFERING NOTIFICATION FORM (Amendment No. 1) Please place an X in the box(es) to designate the appropriate rule provision(s) relied upon to file this Form: Securities Act Rule 801 (Rights Offering) ☐ Securities Act Rule 802 (Exchange Offer) ☐ Exchange Act Rule 13e-4(h)(8) (Issuer Tender Offer) ☒ E

May 7, 2024 EX-1.5

7 May 2024 - Banco Santander, S.A. (the “

Exhibit 1.5 7 May 2024 - Banco Santander, S.A. (the “Offeror”) announces today, with reference to the invitations made to the holders of its outstanding EUR 1,500,000,000 4.75 per cent. Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities (ISIN: XS1793250041) (the “Preferred Securities”) as described in the tender offer memorandum dated 7 May 2024 (the “Tender Of

May 7, 2024 EX-1.1

IMPORTANT NOTICE

EX-1.1 Exhibit 1.1 Notice to U.S. Investors: The proposed transaction relates to the securities of Banco Santander, S.A., a company incorporated in Spain. Information distributed in connection with the proposed transaction is subject to Spanish disclosure requirements that are different from those of the United States. It may be difficult for you to enforce your rights and any claim you may have a

May 7, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (E

6-K FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of May, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

April 30, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 30, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 30, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 30, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 26, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 23, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 18, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 11, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

April 3, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of April, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

March 22, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

March 22, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

March 21, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

March 20, 2024 EX-99.1

REGULATIONS FOR THE EIGHTH CYCLE OF THE DEFERRED MULTIYEAR OBJECTIVES VARIABLE REMUNERATION PLAN

EXHIBIT 99.1 – Banco Santander, S.A. Deferred Multiyear Objectives Variable Remuneration Plan (Cycle VIII) REGULATIONS FOR THE EIGHTH CYCLE OF THE DEFERRED MULTIYEAR OBJECTIVES VARIABLE REMUNERATION PLAN 1. INTRODUCTION Following a proposal by the remuneration committee, these regulations (the "Regulations") were approved by the board of Banco Santander, S.A. ("Banco Santander" or the "Bank") at i

March 20, 2024 EX-99.3

EXHIBIT 99.3 – Banco Santander, S.A. Buyouts Procedure

EXHIBIT 99.3 – Banco Santander, S.A. Buyouts Procedure Banco Santander, S.A.’s (the “Bank” or “Banco Santander”) remuneration system includes the delivery of shares of the Bank or of rights thereon or that are linked to the price of the Bank´s shares, the (immediate or deferred) delivery of shares of the Bank within the application of the Group’s buyout regulations which have been approved by the

March 20, 2024 EX-FILING FEES

Calculation of Filing Fee Tables FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 BANCO SANTANDER, S.A. (Exact Name of Registrant as Specified in Its Charter) Newly Registered Securities

Exhibit 107.1 Calculation of Filing Fee Tables FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 BANCO SANTANDER, S.A. (Exact Name of Registrant as Specified in Its Charter) Newly Registered Securities Security Type Security Class Title (1) Fee Calculation Rule Amount Registered (2) Proposed Maximum Offering Price Per Unit (3) Maximum Aggregate Offering Price Fee Rate Amount of Regi

March 20, 2024 S-8

As filed with the Securities and Exchange Commission on March 20, 2024

As filed with the Securities and Exchange Commission on March 20, 2024 Registration No.

March 20, 2024 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20459 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20459 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Kingdom of Spain (State of incorporation or organization) None (I.R.S. Employer Identification No.) Ciudad Grupo Santa

March 20, 2024 EX-99.2

REGULATIONS FOR THE THIRTEENTH CYCLE OF THE DEFERRED AND CONDITIONAL VARIABLE REMUNERATION PLAN

EXHIBIT 99.2 – Banco Santander, S.A. Deferred and Conditional Variable Remuneration Plan (Cycle XIII) REGULATIONS FOR THE THIRTEENTH CYCLE OF THE DEFERRED AND CONDITIONAL VARIABLE REMUNERATION PLAN 1. INTRODUCTION Following a proposal by the remuneration committee, these regulations (the "Regulations") were approved by the board of Banco Santander, S.A. ("Banco Santander" or the "Bank") at its mee

March 14, 2024 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March, 2024 Commission File Number: 001-125

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March, 2024 Commission File Number: 001-12518 BANCO SANTANDER, S.A. Ciudad Grupo Santander 28660 Boadilla del Monte Madrid Spain (Address of principal executive offices) Indicate by check m

March 14, 2024 EX-1.1

BANCO SANTANDER, S.A. (a company with limited liability organized under the laws of The Kingdom of Spain) U.S.$400,000,000 Senior Non Preferred Callable Floating Rate Notes due 2028 U.S.$1,100,000,000 5.552% Senior Non Preferred Callable Fixed-to-Fix

EX-1.1 Exhibit 1.1 EXECUTION VERSION BANCO SANTANDER, S.A. (a company with limited liability organized under the laws of The Kingdom of Spain) U.S.$400,000,000 Senior Non Preferred Callable Floating Rate Notes due 2028 U.S.$1,100,000,000 5.552% Senior Non Preferred Callable Fixed-to-Fixed Rate Notes due 2028 U.S.$1,250,000,000 5.538% Senior Non Preferred Callable Fixed-to-Fixed Rate Notes due 2030

March 14, 2024 EX-4.1

BANCO SANTANDER, S.A. as Issuer THE BANK OF NEW YORK MELLON, London Branch as Trustee Senior Non Preferred Debt Securities dated as of March 14, 2024

EX-4.1 Exhibit 4.1 BANCO SANTANDER, S.A. as Issuer TO THE BANK OF NEW YORK MELLON, London Branch as Trustee INDENTURE Senior Non Preferred Debt Securities dated as of March 14, 2024 BANCO SANTANDER, S.A. Reconciliation and tie between Trust Indenture Act of 1939, as amended by the Trust Indenture Reform Act of 1990, and this Senior Non Preferred Debt Securities Indenture, dated as of March 14, 202

March 14, 2024 EX-4.3

BANCO SANTANDER, S.A. as Issuer, THE BANK OF NEW YORK MELLON, London Branch as Trustee and Principal Paying Agent THE BANK OF NEW YORK MELLON SA/NV, Luxembourg Branch as Subordinated Debt Securities Registrar SECOND SUPPLEMENTAL INDENTURE dated as of

EX-4.3 Exhibit 4.3 BANCO SANTANDER, S.A. as Issuer, THE BANK OF NEW YORK MELLON, London Branch as Trustee and Principal Paying Agent and THE BANK OF NEW YORK MELLON SA/NV, Luxembourg Branch as Subordinated Debt Securities Registrar SECOND SUPPLEMENTAL INDENTURE dated as of March 14, 2024 to SUBORDINATED DEBT SECURITIES INDENTURE dated as of August 8, 2023 SECOND SUPPLEMENTAL INDENTURE (“Second Sup

March 14, 2024 6-K

FORM 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

March 14, 2024 EX-4.2

BANCO SANTANDER, S.A. as Issuer, THE BANK OF NEW YORK MELLON, London Branch as Trustee, Calculation Agent and Principal Paying Agent THE BANK OF NEW YORK MELLON SA/NV, Luxembourg Branch as Senior Non Preferred Debt Securities Registrar FIRST SUPPLEME

EX-4.2 Exhibit 4.2 BANCO SANTANDER, S.A. as Issuer, THE BANK OF NEW YORK MELLON, London Branch as Trustee, Calculation Agent and Principal Paying Agent and THE BANK OF NEW YORK MELLON SA/NV, Luxembourg Branch as Senior Non Preferred Debt Securities Registrar FIRST SUPPLEMENTAL INDENTURE dated as of March 14, 2024 to SENIOR NON PREFERRED DEBT SECURITIES INDENTURE dated as of March 14, 2024 FIRST SU

March 12, 2024 424B5

Banco Santander, S.A. $400,000,000 Senior Non Preferred Callable Floating Rate Notes due 2028 $1,100,000,000 5.552% Senior Non Preferred Callable Fixed-to-Fixed Rate Notes due 2028 $1,250,000,000 5.538% Senior Non Preferred Callable Fixed-to-Fixed Ra

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-271955 PROSPECTUS SUPPLEMENT (to prospectus dated May 16, 2023) $2,750,000,000 Banco Santander, S.A. $400,000,000 Senior Non Preferred Callable Floating Rate Notes due 2028 $1,100,000,000 5.552% Senior Non Preferred Callable Fixed-to-Fixed Rate Notes due 2028 $1,250,000,000 5.538% Senior Non Preferred Callable Fixed-

March 12, 2024 FWP

PRICING TERM SHEET U.S.$1,250,000,000 6.350% Tier 2 Subordinated Fixed Rate Notes Due 2034 (the “Tier 2 2034 Fixed Rate Notes”)

Filed Pursuant to Rule 433 Registration No. 333-271955 Dated: March 11, 2024 PRICING TERM SHEET U.S.$1,250,000,000 6.350% Tier 2 Subordinated Fixed Rate Notes Due 2034 (the “Tier 2 2034 Fixed Rate Notes”) Issuer: Banco Santander, S.A. Series Number: SUBSAN-221 Issuer Ratings*: A2 (Stable) / A+ (Stable) / A- (Stable) by Moody’s/S&P/Fitch Expected Notes Ratings*: Baa2 / BBB+ / BBB (Moody’s / S&P / F

March 12, 2024 FWP

PRICING TERM SHEET U.S.$400,000,000 Senior Non Preferred Callable Floating Rate Notes due 2028 (the “SNP 2028 Floating Rate Notes”)

Filed Pursuant to Rule 433 Registration No. 333-271955 Dated: March 11, 2024 PRICING TERM SHEET U.S.$400,000,000 Senior Non Preferred Callable Floating Rate Notes due 2028 (the “SNP 2028 Floating Rate Notes”) Issuer: Banco Santander, S.A. Series Number: SNP-217 Issuer Ratings*: A2 (Stable) / A+ (Stable) / A- (Stable) by Moody’s/S&P/Fitch Expected Notes Ratings*: Baa1 / A- / A- (Moody’s / S&P / Fit

March 12, 2024 424B5

Banco Santander, S.A. $1,250,000,000 6.350% Tier 2 Subordinated Fixed Rate Notes due 2034

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-271955 PROSPECTUS SUPPLEMENT (to prospectus dated May 16, 2023) $1,250,000,000 Banco Santander, S.A. $1,250,000,000 6.350% Tier 2 Subordinated Fixed Rate Notes due 2034 We are offering $1,250,000,000 principal amount of 6.350% Tier 2 Subordinated Fixed Rate Notes due 2034 (the “Notes”). The Notes will bear interest a

March 12, 2024 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type)       Banco Santander, S.A.       (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables 424(b)(5) (Form Type)       Banco Santander, S.

March 12, 2024 EX-FILING FEES

Calculation of Filing Fee Tables (Form Type) Banco Santander, S.A. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered

Exhibit 107 Calculation of Filing Fee Tables 424(b)(5) (Form Type) Banco Santander, S.

March 11, 2024 424B5

Subject to Completion Preliminary Prospectus Supplement dated March 11, 2024

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-271955 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities nor do they seek an offer to buy these securities in any jurisdiction where the offer or sale is not per

March 11, 2024 424B5

Subject to Completion Preliminary Prospectus Supplement dated March 11, 2024

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration Statement No. 333-271955 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not an offer to sell these securities nor do they seek an offer to buy these securities in any jurisdiction where the offer or sale is not per

March 7, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2024 Commission File Number: 001-12518 Banco Santander, S.A.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of March, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executive

February 29, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 21, 2024 EX-12.2

Section 302 Certification

Exhibit 12.2 Section 302 Certification I, José G. Cantera, certify that: 1.I have reviewed this annual report on Form 20-F of Banco Santander, S.A.; 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading w

February 21, 2024 EX-12.1

Section 302 Certification

Exhibit 12.1 Section 302 Certification I, Héctor Grisi, certify that: 1. I have reviewed this annual report on Form 20-F of Banco Santander, S.A.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading wi

February 21, 2024 EX-2.2

DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Description of American Depositary Shares

Exhibit 2.2 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Description of American Depositary Shares The following description of Banco Santander’s American depositary shares (the “ADSs”) is a summary and does not purport to be complete. It is subject to and qualified in its entirety by reference to the amended and restated depos

February 21, 2024 20-F

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F (Mark One) ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHA

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F (Mark One) ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ending 31 December 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1

February 21, 2024 EX-97.1

ANNEX: FINANCIAL STATEMENT COMPENSATION RECOUPMENT

Exhibit 97.1 ANNEX: FINANCIAL STATEMENT COMPENSATION RECOUPMENT This Annex provides for the recoupment of certain executive compensation in the event of an accounting restatement resulting from material noncompliance with financial reporting requirements under U.S. federal securities laws in accordance with the terms and conditions set forth herein. Banco Santander S.A. (hereinafter, “the Group” o

February 21, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 21, 2024 EX-1.1

BYLAWS OF BANCO SANTANDER, S.A. CHAPTER I. THE COMPANY AND ITS CAPITAL Section 1. Name of the Company

Exhibit 1.1 BYLAWS OF BANCO SANTANDER, S.A. CHAPTER I. THE COMPANY AND ITS CAPITAL Section 1. Name of the Company Article 1. Corporate name The name of the Company is BANCO SANTANDER, S.A. (hereinafter, the “Bank” or the “Company”). The Bank was founded in the city for which it was named, by means of a public instrument executed on 3 March 1856 before notary public Mr. José Dou Martínez; such publ

February 21, 2024 EX-12.3

Section 302 Certification

Exhibit 12.3 Section 302 Certification I, José Doncel, certify that: 1.I have reviewed this annual report on Form 20-F of Banco Santander, S.A.; 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with

February 21, 2024 EX-15.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

Exhibit 15.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form F-3 (No. 333-271955) and on Form S-8 (No. 333-269251, No. 333-262484, No. 333-256936, No. 333-238260, No. 333-231568 and 333-227289) of Banco Santander, S.A. of our report dated February 21, 2024 relating to the financial statements and th

February 21, 2024 EX-13.1

Section 906 Certification

Exhibit 13.1 Section 906 Certification The certification set forth below is being submitted in connection with the Annual Report on Form 20-F for the year ended 31 December 2023 (the “Report”) for the purpose of complying with Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code. Héctor Gri

February 20, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 20, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 20, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 20, 2024 6-K

FORM 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

February 20, 2024 EX-99.1

EX-99.1

Think Value Think Customer Think Global 2023 Annual report santander.com 2023 Annual report Unless otherwise specified, references in this annual report to other documents, including but not limited to other reports and websites, including our own, are for information purposes only. If the contents of such other documents and websites refer to this annual report, they are not nor should be conside

February 5, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of February, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

January 31, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

January 31, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A

q42023pr FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal

January 31, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

January 31, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

January 26, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

January 24, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

January 18, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

January 11, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

January 4, 2024 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of January, 2024 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executiv

December 28, 2023 6-K

FORM 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

December 21, 2023 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

December 20, 2023 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

December 20, 2023 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

December 14, 2023 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

December 13, 2023 6-K

FORM 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

December 11, 2023 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

December 5, 2023 6-K

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.

FORM 6-K SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Report of Foreign Issuer Pursuant to Rule 13a-16 or 15d-16 of the Securities Exchange Act of 1934 For the month of December, 2023 Commission File Number: 001-12518 Banco Santander, S.A. (Exact name of registrant as specified in its charter) Ciudad Grupo Santander 28660 Boadilla del Monte (Madrid) Spain (Address of principal executi

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