YMAB / Y-mAbs Therapeutics, Inc. - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Y-mAbs Therapeutics, Inc.
US ˙ NasdaqGS ˙ US9842411095

Mga Batayang Estadistika
CIK 1722964
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 Y-mAbs Therapeutics, Inc.
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 2, 2025 SC TO-T/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company — Issuer) YOSEMITE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company — Issuer) YOSEMITE MERGER SUB, INC. (Offeror) a wholly owned subsidiary of PERSEUS BIDCO US, INC. (Parent of Offeror) Common Stock, par value $0.0001 per share (Title o

September 2, 2025 SC 14D9/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 (Amendment No. 1) Y-MABS THERAPEUTICS, INC. (Name of Subject Co

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 (Amendment No. 1) Y-MABS THERAPEUTICS, INC. (Name of Subject Company) Y-MABS THERAPEUTICS, INC. (Name of Persons Filing Statement) Common Stock, $0.0001 par value per share (Title of Class of Securities) 984241109

August 18, 2025 EX-99.(E)(7)

ADDENDUM TO EMPLOYMENT CONTRACT Y-mAbs Therapeutics A/S Agern Allé 11 2970 Hørsholm (the “Employer”) and Joris Wilms   (the “Employee”) (collectively the “Parties”)

Exhibit (e)(7) ADDENDUM TO EMPLOYMENT CONTRACT Between Y-mAbs Therapeutics A/S Agern Allé 11 2970 Hørsholm (the “Employer”) and Joris Wilms   (the “Employee”) (collectively the “Parties”) With effect from June 1, 2020, the Employment Contract entered into between the Parties (with previous amendments) shall be amended as follows: 1.

August 18, 2025 EX-99.(A)(1)(II)

Letter of Transmittal to Tender Shares of Common Stock of Y-MABS THERAPEUTICS, INC. $8.60 Per Share YOSEMITE MERGER SUB, INC. a wholly owned subsidiary of PERSEUS BIDCO US, INC.

 Exhibit (a)(1)(ii) Letter of Transmittal to Tender Shares of Common Stock of Y-MABS THERAPEUTICS, INC.

August 18, 2025 EX-99.(A)(1)(I)

Offer to Purchase for Cash All Outstanding Shares of Common Stock Y-MABS THERAPEUTICS, INC. $8.60 Per Share YOSEMITE MERGER SUB, INC. a wholly owned subsidiary of PERSEUS BIDCO US, INC. THE OFFER AND WITHDRAWAL RIGHTS EXPIRE ONE MINUTE FOLLOWING 11:5

TABLE OF CONTENTS  Exhibit (a)(1)(i) Offer to Purchase for Cash All Outstanding Shares of Common Stock of Y-MABS THERAPEUTICS, INC.

August 18, 2025 EX-FILING FEES

Table 1: Transaction Valuation

Calculation of Filing Fee Tables Table 1: Transaction Valuation Transaction Valuation Fee Rate Amount of Filing Fee Fees to be Paid 1 $ 411,886,943.

August 18, 2025 EX-99.(A)(1)(V)

Offer to Purchase for Cash All Outstanding Shares of Common Stock Y-MABS THERAPEUTICS, INC. $8.60 Per Share YOSEMITE MERGER SUB, INC. a wholly owned subsidiary of PERSEUS BIDCO US, INC. THE OFFER AND WITHDRAWAL RIGHTS EXPIRE ONE MINUTE FOLLOWING 11:5

 Exhibit (a)(1)(v) Offer to Purchase for Cash All Outstanding Shares of Common Stock of Y-MABS THERAPEUTICS, INC.

August 18, 2025 EX-99.(A)(1)(IV)

Offer to Purchase for Cash All Outstanding Shares of Common Stock Y-MABS THERAPEUTICS, INC. $8.60 Per Share YOSEMITE MERGER SUB, INC. a wholly owned subsidiary of PERSEUS BIDCO US, INC. THE OFFER AND WITHDRAWAL RIGHTS EXPIRE ONE MINUTE FOLLOWING 11:5

 Exhibit (a)(1)(iv) Offer to Purchase for Cash All Outstanding Shares of Common Stock of Y-MABS THERAPEUTICS, INC.

August 18, 2025 SC 14D9

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company) Y-MABS THER

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company) Y-MABS THERAPEUTICS, INC. (Name of Persons Filing Statement) Common Stock, $0.0001 par value per share (Title of Class of Securities) 984241109

August 18, 2025 EX-99.(E)(8)

EMPLOYMENT AGREEMENT for DOUG GENTILCORE

Exhibit (e)(8) EMPLOYMENT AGREEMENT for DOUG GENTILCORE This Employment Agreement (the “Agreement”) is made between Y-mAbs Therapeutics, Inc.

August 18, 2025 EX-99.(E)(3)

This Mutual Confidentiality Agreement

Exhibit (e)(3) This Mutual Confidentiality Agreement (this “Agreement”), dated as of February 4, 2025, is by and between BTG International Inc, a Delaware corporation (“Serb”), and Y-mAbs Therapeutics, Inc.

August 18, 2025 EX-99.(A)(1)(III)

Notice of Guaranteed Delivery to Tender Shares of Common Stock of Y-MABS THERAPEUTICS, INC. $8.60 Per Share YOSEMITE MERGER SUB, INC. a wholly owned subsidiary of PERSEUS BIDCO US, INC. (not to be used for Signature Guarantees)

 Exhibit (a)(1)(iii) Notice of Guaranteed Delivery to Tender Shares of Common Stock of Y-MABS THERAPEUTICS, INC.

August 18, 2025 SC TO-T

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company — Issuer) YOSEMITE

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company — Issuer) YOSEMITE MERGER SUB, INC. (Offeror) a wholly owned subsidiary of PERSEUS BIDCO US, INC. (Parent of Offeror) Common Stock, par value $0.0001 per share (Title o

August 18, 2025 EX-99.(D)(III)

This Mutual Confidentiality Agreement

Exhibit d(iii) This Mutual Confidentiality Agreement (this “Agreement”), dated as of February 4, 2025, is by and between BTG International Inc, a Delaware corporation (“Serb”), and Y-mAbs Therapeutics, Inc.

August 18, 2025 EX-99.(E)(10)

Y-MABS THERAPEUTICS, INC. EXECUTIVE SEVERANCE PLAN AND SUMMARY PLAN DESCRIPTION APPROVED BY THE BOARD OF DIRECTORS: January 6, 2025

Exhibit (e)(10) Y-MABS THERAPEUTICS, INC. EXECUTIVE SEVERANCE PLAN AND SUMMARY PLAN DESCRIPTION APPROVED BY THE BOARD OF DIRECTORS: January 6, 2025 1. Introduction. The purpose of this Y-mAbs Therapeutics, Inc. Executive Severance Plan (the “Plan”) is to provide assurances of specified severance benefits to eligible executives of the Company whose employment is terminated by the Company or a succe

August 18, 2025 EX-99.(E)(9)

Y-MABS THERAPEUTICS, INC. INVENTION AND CONFIDENTIAL INFORMATION AGREEMENT

Exhibit (e)(9) December 19, 2023 JOHN LAROCCA Re: Y-mAbs Therapeutics, Inc. — Offer of Employment Dear John: It is a pleasure to offer you employment with Y-mAbs Therapeutics, Inc. (“the Company”) in the position of General Counsel, Vice President Legal. You will report directly to Chief Executive Officer, Michael Rossi (“the Manager”) or another individual designated by him. You shall perform suc

August 18, 2025 EX-99.(A)(1)(VI)

This announcement is neither an offer to purchase nor a solicitation of an offer to sell Shares (as defined below). The Offer (as defined below) is made solely pursuant to the Offer to Purchase dated August 18, 2025 and the related Letter of Transmit

Exhibit (a)(1)(vi) This announcement is neither an offer to purchase nor a solicitation of an offer to sell Shares (as defined below).

August 8, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-38650 Y-mA

August 8, 2025 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (In thousands, except share and per share data)

Exhibit 99.1 Y-mAbs Reports Second Quarter 2025 Financial Results and Recent Corporate Developments ● Reported Total Revenues of $19.5 million for the second quarter of 2025, exceeding the high end of the Company’s guidance range of between $17 million and $19 million ● SERB Pharmaceuticals to acquire Y-mAbs in $412.0 million transaction; transaction expected to close by the fourth quarter of 2025

August 8, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 8, 2025 Y-MABS THERAPEUTIC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 8, 2025 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiza

August 6, 2025 EX-99.2

Exhibit 99.2: Employee FAQ, dated August 6, 2025.

Exhibit 99.2 Y-mAbs Employee FAQ 1. What was announced? · We have entered into an agreement under which SERB Pharmaceuticals has agreed to acquire Y-mAbs Therapeutics in a transaction at an equity value for Y-mAbs of $412 million. · Under the terms of the merger agreement, SERB is obligated to initiate a tender offer to acquire all outstanding shares of Y-mAbs for $8.60 per share in cash. · By com

August 6, 2025 EX-99.1

Exhibit 99.1: A message to Company employees from Parent, dated August 6, 2025.

Exhibit 99.1 FROM: Vanessa TO: Y-mAbs-All TIMING: Day after Announcement SUBJECT: A Note from SERB Dear Y-mAbs team, On behalf of the entire SERB team, I wanted to take a moment to reach out to introduce myself and express my excitement for this next chapter together. SERB is a specialty pharmaceutical company with a global presence across Europe, the U.S., the Middle East and Australia. Founded i

August 6, 2025 EX-99.1

A message to Company employees from SERB Pharmaceuticals, dated August 6, 2025.

Exhibit 99.1 FROM: Vanessa TO: Y-mAbs-All TIMING: Day after Announcement SUBJECT: A Note from SERB Dear Y-mAbs team, On behalf of the entire SERB team, I wanted to take a moment to reach out to introduce myself and express my excitement for this next chapter together. SERB is a specialty pharmaceutical company with a global presence across Europe, the U.S., the Middle East and Australia. Founded i

August 6, 2025 SC TO-C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE TO Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company) YOSEMITE ME

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE TO Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company) YOSEMITE MERGER SUB, INC. (Offeror) A Wholly Owned Subsidiary of PERSEUS BIDCO US, INC. (Parent of Offeror) Common Stock, Par Value $0.0001 Per Share (Title of C

August 6, 2025 SC14D9C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company) Y-MABS THER

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company) Y-MABS THERAPEUTICS, INC. (Name of Persons Filing Statement) Common Stock, $0.0001 par value per share (Title of Class of Securities) 984241109 (CUSIP Number of

August 5, 2025 EX-99.1

Joint Press Release issued by SERB Pharmaceuticals and the Company, dated August 5, 2025.

Exhibit 99.1 FOR IMMEDIATE RELEASE SERB Pharmaceuticals Agrees to Acquire Y-mAbs Therapeutics Acquisition to Include DANYELZA® (Naxitamab-gqgk), Further Broadening SERB’s Rare Oncology Product Portfolio Transaction Expands SERB’s Investment in the U.S. SERB to Commence All-Cash Tender Offer to Acquire All Outstanding Shares of Y-mAbs for $8.60 Per Share Represents 105% Premium to Y-mAbs Closing Sh

August 5, 2025 EX-99.6

Exhibit 99.6: LinkedIn Post, dated August 5, 2025.

Exhibit 99.6 Y-mAbs LinkedIn Post Forward-Looking Statements This communication contains forward-looking statements that involve risks and uncertainties relating to future events and the future performance of Y-mAbs and Serb, including statements relating to the ability to complete and the timing of completion of the transactions contemplated by the Agreement and Plan of Merger dated as of August

August 5, 2025 EX-99.1

Exhibit 99.1: Joint Press Release issued by Parent and the Company, dated August 5, 2025 (incorporated by reference to Exhibit 99.1 of the Current Report on Form 8-K filed by the Company with the U.S. Securities and Exchange Commission on August 5, 2025).

Exhibit 99.1 FOR IMMEDIATE RELEASE SERB Pharmaceuticals Agrees to Acquire Y-mAbs Therapeutics Acquisition to Include DANYELZA®(Naxitamab-gqgk), Further Broadening SERB’s Rare Oncology Product Portfolio Transaction Expands SERB’s Investment in the U.S. SERB to Commence All-Cash Tender Offer to Acquire All Outstanding Shares of Y-mAbs for $8.60 Per Share Represents 105% Premium to Y-mAbs Closing Sha

August 5, 2025 EX-99.2

Exhibit 99.2: Email from Michael Rossi, President and Chief Executive Officer of the Company, sent to employees, dated August 5, 2025.

Exhibit 99.2 Y-mAbs Employee Email Sender: Mike Rossi Subject: Important Update on the Next Step in Our Y-mAbs Journey Send Date: August 5, 2025 Distribution: All Employees Y-mAbs Team, Since day one, our mission at Y-mAbs Therapeutics has been clear: bring important new therapies to patients as quickly as possible. Through DANYELZA®, our company has brought one of the most important innovations i

August 5, 2025 EX-99.5

Exhibit 99.5: Vendor/Supplier Letter, dated August 5, 2025.

Exhibit 99.5 Y-mAbs Vendor / Supplier Courtesy Letter Dear Valued Partner, I am reaching out with important news about Y-mAbs Therapeutics. Today, we announced that we have entered into a definitive agreement under which SERB Pharmaceuticals has agreed to acquire Y-mAbs. Since our founding, patients have been the top priority for Y-mAbs. We recognize that our work with patients is critical as we f

August 5, 2025 EX-10.1

Form of Tender and Support Agreement, dated as of August 4, 2025, by and between Perseus BidCo US, Inc., and the stockholders party thereto

Exhibit 10.1 TENDER AND SUPPORT AGREEMENT THIS TENDER AND SUPPORT AGREEMENT (this “Agreement”) is made and entered into as of August 4, 2025, by and between Perseus BidCo US, Inc., a Delaware corporation (“Parent”), and the undersigned holder (the “Stockholder”) of shares of common stock of Y-mAbs Therapeutics, Inc., a Delaware corporation (the “Company”). Capitalized terms used herein and not def

August 5, 2025 EX-99.1

SERB Pharmaceuticals Agrees to Acquire Y-mAbs Therapeutics Acquisition to Include Naxitamab-gqgk DANYELZA®(Naxitamab-gqgk), Further Broadening SERB’s Rare Oncology Product Portfolio Transaction Expands SERB’s Investment in the U.S. SERB to Commence A

Exhibit 99.1 FOR IMMEDIATE RELEASE SERB Pharmaceuticals Agrees to Acquire Y-mAbs Therapeutics Acquisition to Include Naxitamab-gqgk DANYELZA®(Naxitamab-gqgk), Further Broadening SERB’s Rare Oncology Product Portfolio Transaction Expands SERB’s Investment in the U.S. SERB to Commence All-Cash Tender Offer to Acquire All Outstanding Shares of Y-mAbs for $8.60 Per Share Represents 105% Premium to Y-m

August 5, 2025 EX-99.4

Exhibit 99.4: Patient and Patient Advocacy Organization Letter, dated August 5, 2025.

Exhibit 99.4 Y-mAbs Patient and Patient Advocacy Organizations Courtesy Letter Hello, I am reaching out with important news about Y-mAbs Therapeutics. Today, we announced that we have entered into a definitive agreement under which SERB Pharmaceuticals has agreed to acquire Y-mAbs. Since our founding, patients have been the top priority for Y-mAbs. We recognize that our work with patients is criti

August 5, 2025 EX-99.3

News article published by Endpoints: Specialty pharma SERB to buy Y-mAbs in $412M all-cash deal, by Kyle LaHucik, dated August 5, 2025.

Exhibit 99.3 Specialty pharma SERB to buy Y-mAbs in $412M all-cash deal Endpoints 5 August 2025 By Kyle LaHucik Specialty drugmaker SERB Pharmaceuticals plans to buy cancer biotech Y-mAbs Therapeutics to further broaden its portfolio of more than 70 medicines. SERB will pay $8.60 per share to buy Y-mAbs $YMAB, the companies said Tuesday morning. Y-mAbs’ stock price skyrocketed 103% to $8.51 apiece

August 5, 2025 EX-99.2

Social media posts of SERB Pharmaceuticals and Vanessa Wolfeler, President of SERB Pharmaceuticals, dated August 5, 2025.

Exhibit 99.2

August 5, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 4, 2025 Y-mAbs Therapeutic

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 4, 2025 Y-mAbs Therapeutics, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38650 47-4619612 (State or Other Jurisdiction of Incorporation) (Commissio

August 5, 2025 EX-2.1

Agreement and Plan of Merger, dated as of August 4, 2025, by and among Perseus BidCo US, Inc., Yosemite Merger Sub, Inc. and the Company, and solely for purposes of Section 5.16 and Article 8 therein, Stark International Lux (incorporated by reference to Exhibit 2.1 to the Registrant’s Current Report on Form 8-K (File No. 001-38650) filed with the Securities and Exchange Commission on August 5, 2025)

Exhibit 2.1 EXECUTION VERSION AGREEMENT AND PLAN OF MERGER among: Perseus BidCo US, Inc., a Delaware corporation; Yosemite Merger Sub, Inc., a Delaware corporation; Y-mAbs Therapeutics, Inc., a Delaware corporation; and solely for the purposes of Section ‎5.16 and ‎Article 8 Stark International Lux, a Luxembourg société à responsabilité limitée Dated as of August 4, 2025 TABLE OF CONTENTS Page Art

August 5, 2025 EX-99.3

Exhibit 99.3: Investor/Analyst Letter, dated August 5, 2025.

Exhibit 99.3 Y-mAbs Investor / Analyst Courtesy Letter Subject: Y-mAbs Agrees to be Acquired by SERB for $8.60 per Share Good morning, I’m pleased to share that Y-mAbs Therapeutics has entered into a definitive agreement under which SERB Pharmaceuticals has agreed to acquire Y-mAbs in a transaction with an equity value of $412 million. Members of the management team will be available to answer que

August 5, 2025 SC TO-C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE TO Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company) YOSEMITE ME

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE TO Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1) of the Securities Exchange Act of 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company) YOSEMITE MERGER SUB, INC. (Offeror) A Wholly Owned Subsidiary of PERSEUS BIDCO US, INC. (Parent of Offeror) Common Stock, Par Value $0.0001 Per Share (Title of C

August 5, 2025 SC14D9C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company) Y-MABS THER

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14D-9 Solicitation/Recommendation Statement Under Section 14(d)(4) of the Securities Exchange Act of 1934 Y-MABS THERAPEUTICS, INC. (Name of Subject Company) Y-MABS THERAPEUTICS, INC. (Name of Persons Filing Statement) Common Stock, $0.0001 par value per share (Title of Class of Securities) 984241109 (CUSIP Number of

July 15, 2025 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 11, 2025 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizat

May 30, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ⌧ Filed by a Party other than the Registrant ◻ Check the appropriate box: ◻ Preliminary Proxy Statement ◻ Confidential, for Use of the Commission Only (as permitted by Rule 14

May 30, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ⌧ Filed by a Party other than the Registrant ◻ Check the appropriate box: ◻ Preliminary Proxy Statement ◻ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ◻ Defin

May 28, 2025 EX-99.1

Radiopharmaceutical R&D Update May 28, 2025

Exhibit 99.1 Radiopharmaceutical R&D Update May 28, 2025 Disclaimer Forward - Looking Statements This presentation contains forward - looking statements within the meaning of the US Private Securities Litigation Reform Act of 1995 . The forward - looking statements involve substantial risks and uncertainties . All statements, other than statements of historical facts, contained in this presentatio

May 28, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 28, 2025 Y-MABS THERAPEUTICS,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 28, 2025 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizati

May 28, 2025 EX-99.2

Y-mAbs Hosts Virtual Radiopharmaceutical R&D Update Highlighting Clinical Progress and Expanded Pipeline -        Company’s Part A data readout from first-in-human Phase 1 Trial 1001 in patients with recurrent or refractory metastatic solid tumors kn

Exhibit 99.2 Y-mAbs Hosts Virtual Radiopharmaceutical R&D Update Highlighting Clinical Progress and Expanded Pipeline -        Company’s Part A data readout from first-in-human Phase 1 Trial 1001 in patients with recurrent or refractory metastatic solid tumors known to express GD2, validates GD2-SADA as safe, tolerable and able to achieve targeted in vivo conjugation of 177Lu-DOTA -        Increas

May 13, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-38650 Y-m

May 13, 2025 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (In thousands, except share and per share data)

Exhibit 99.1 Y-mAbs Reports First Quarter 2025 Financial Results and Recent Corporate Developments ● Reported Net Product Revenues of $20.9 million for the first quarter of 2025, a year-over-year increase of approximately 8% ● National Comprehensive Cancer Network® (NCCN®) Clinical Practice Guidelines in Oncology for Neuroblastoma updated to include naxitamab-gqgk (DANYELZA®) ● Dosed first patient

May 13, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 13, 2025 Y-MABS THERAPEUTICS,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 13, 2025 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizati

April 29, 2025 10-K/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A (Mark One) ☒Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2024 OR ☐Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. for the transition period from to . Commission File Number 001-

April 29, 2025 EX-10.44

Amended and Restated Non-Employee Director Compensation Policy, effective March 18, 2025.

Exhibit 10.44 Y-MABS THERAPEUTICS, INC. AMENDED AND RESTATED NON-EMPLOYEE DIRECTOR COMPENSATION POLICY The Board of Directors (the “Board”) of Y-mAbs Therapeutics, Inc. (the “Company”) has approved the following Amended and Restated Non-Employee Director Compensation Policy (the “Policy”), which establishes compensation to be paid to Non-Employee Directors (as defined below) of the Company, as an

March 4, 2025 424B5

Up to $35,000,000 Common Stock

424B5 1 tmb-20250304x424b5.htm 424B5 Table of Contents As Filed Pursuant to Rule 424(b)(5) Registration No. 333-271006 PROSPECTUS SUPPLEMENT (To Prospectus Dated May 5, 2023) Up to $35,000,000 Common Stock We have entered into an Equity Distribution Agreement, or the Distribution Agreement, dated as of March 4, 2025, with Oppenheimer & Co. Inc., or the Sales Agent, relating to the sale of shares o

March 4, 2025 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 4, 2025 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizat

March 4, 2025 EX-10.43

Amendment No.1 to License Agreement dated December 17, 2020, entered into and effective on December 9, 2024, by and between the Registrant and SciClone Pharmaceuticals International Ltd

Exhibit 10.43 First Amendment to the LICENSE AGREEMENT Between Y-mAbs Therapeutics, Inc. and SciClone Pharmaceuticals International Ltd. This First Amendment to the License Agreement (the “Amendment”) is entered into as of December 9, 2024 (the “Effective Date”), by and between Y-mAbs Therapeutics, Inc., a Delaware corporation with its principal offices located at 230 Park Avenue, Suite 3350, New

March 4, 2025 S-8

As filed with the Securities and Exchange Commission on March 4, 2025

As filed with the Securities and Exchange Commission on March 4, 2025 Registration No.

March 4, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 4, 2025 Y-MABS THERAPEUTICS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 4, 2025 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizat

March 4, 2025 EX-10.42

Amendment No.3 to License Agreement dated August 20, 2015, entered into and effective on November 8, 2024, by and between the Registrant and Memorial Sloan-Kettering Cancer Center

Exhibit 10.42 MENDMENT NO. 3 AMENDMENT NO. 3 to LICENSE AGREEMENT DATED August 20, 2015 between MEMORIAL SLOAN-KETTERING CANCER CENTER and Y-MABS THERAPEUTICS, INC. i Amendment no. 3 to license agreement This Amendment No. 3 (“Amendment”), effective on the date of the last signature below (“Amendment Effective Date”), is made to that certain License Agreement dated August 20. 2015, as amended on M

March 4, 2025 EX-19.1

Y-mAbs Therapeutics, Inc. Insider Trading Compliance Policy

Exhibit 19.1 Y-mAbs Therapeutics, Inc. Insider Trading Compliance Policy I. PURPOSE Y-mAbs Therapeutics, Inc. (“Y-mAbs” or the “Company”) has adopted this Insider Trading Compliance Policy (the “Policy”) to assist with compliance with insider trading laws and to prevent even the appearance of improper trading. Additionally, this Policy prohibits the unauthorized disclosure and misuse of any materi

March 4, 2025 EX-21.1

Subsidiary of the Registrant

Exhibit 21.1 Subsidiary of the Registrant Y-mAbs Therapeutics A/S (Denmark)

March 4, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024. OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-38

March 4, 2025 EX-FILING FEES

Exhibit Fee Table

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Y-mAbs Therapeutics, Inc.

March 4, 2025 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (In thousands, except share and per share data)

Exhibit 99.1 Y-mAbs Reports Fourth Quarter 2024 Financial Results and Recent Corporate Developments ● Reported Total Revenues of $26.5 million for the fourth quarter of 2024 and $87.7 million for the full year 2024 ● The Company established two business units in January 2025 aimed to accelerate the clinical development of its Radiopharmaceuticals Platform and optimize the commercial potential of D

March 4, 2025 EX-1.1

Equity Distribution Agreement, dated March 4, 2025, by and between the Registrant and Oppenheimer & Co. Inc. (incorporated by reference to Exhibit 1.1 to the Registrant’s Form 8-K filed, March 4, 2025)

Exhibit 1.1 Y-MABS THERAPEUTICS, INC. EQUITY DISTRIBUTION AGREEMENT March 4, 2025 Oppenheimer & Co. Inc. 85 Broad Street, 26th Floor New York, New York 10004 Ladies and Gentlemen: Y-mAbs Therapeutics, Inc., a Delaware corporation (the “Company”), confirms its agreement (this “Agreement”) with Oppenheimer & Co. Inc. (the “Agent”), as follows: 1. Issuance and Sale of Shares. The Company agrees that,

March 4, 2025 EX-4.2

Description of the registrant’s securities registered pursuant to section 12 of the Securities Exchange Act of 1934.

EXHIBIT 4.2 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of February 25, 2025, Y-mAbs Therapeutics, Inc. (“Y-mAbs,” “we,” “our” or “us”), had one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): our common stock, par value $0.0001 per share. The followin

January 13, 2025 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 13, 2025 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

January 10, 2025 8-K

Regulation FD Disclosure, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 6, 2025 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiz

January 10, 2025 EX-99.1

Y-mAbs Provides Strategic Business Update and 2025 Priorities Company establishes two business units with goal of accelerating clinical development of its Radiopharmaceuticals Platform and optimizing the commercial potential of DANYELZA Preliminary P

Exhibit 99.1 Y-mAbs Provides Strategic Business Update and 2025 Priorities Company establishes two business units with goal of accelerating clinical development of its Radiopharmaceuticals Platform and optimizing the commercial potential of DANYELZA Preliminary Part A data from GD2-SADA Phase 1 trial demonstrates tolerability and validity of SADA PRIT platform pre-targeting approach; Company expec

November 14, 2024 SC 13G/A

YMAB / Y-mAbs Therapeutics, Inc. / Paradigm Biocapital Advisors LP - SC 13G/A Passive Investment

SC 13G/A 1 tm2427604d2sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock, $0.0001 par value per share (Title of Class of Securities) 984241109 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of this stateme

November 8, 2024 EX-10.4

License Agreement dated September 11, 2024, by and between the Registrant and Princeton 202 Associates Limited Partnership (incorporated by reference to Exhibit 10.4 to Registrant’s Form 10-Q filed, November 8, 2024)

Exhibit 10.4 LICENSE AGREEMENT LICENSE AGREEMENT, dated as of September 11, 2024, between Princeton 202 Associates Limited Partnership, a New Jersey limited partnership, with offices c/o Boston Properties at 101 Carnegie Center, Suite 104, Princeton, New Jersey 08540 (the “Licensor”), and Y-mAbs Therapeutics, Inc., a Delaware corporation, with its principal office at 230 Park Avenue, Suite 3350, N

November 8, 2024 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (In thousands, except share and per share data)

Exhibit 99.1 Y-mAbs Reports Third Quarter 2024 Financial Results and Recent Corporate Developments ● Reported Total DANYELZA net product revenues of $18.5 million for the third quarter of 2024 ● Entered into exclusive license and distribution agreement with Nobelpharma for DANYELZA in Japan recognizing an upfront payment of $2.0 million in the fourth quarter of 2024 ● Achieved extension of primary

November 8, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 8, 2024 Y-MABS THERAPEUT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 8, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

November 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-38650

November 8, 2024 EX-10.3

Lease Agreement dated September 11, 2024, by and between the Registrant and Princeton 202 Associates Limited Partnership (incorporated by reference to Exhibit 10.3 to Registrant’s Form 10-Q filed, November 8, 2024)

Exhibit 10.3 LEASE AND LEASE AGREEMENT Between Princeton 202 Associates Limited Partnership The Landlord And Y-mAbs Therapeutics, Inc. The Tenant For Leased Premises In 202 Carnegie Center Princeton, New Jersey September 11, 2024 Prepared by: Gregory S. Ricciardi, Esq. Boston Properties 101 Carnegie Center, Suite 104 Princeton, New Jersey 08540 TABLE OF CONTENTS ‌Page 1 Definitions‌1 2 Lease of th

November 4, 2024 EX-99.1

Y-mAbs and Nobelpharma Announce Exclusive License and Distribution Agreement for DANYELZA

Exhibit 99.1 Y-mAbs and Nobelpharma Announce Exclusive License and Distribution Agreement for DANYELZA® (naxitamab-gqgk) in Japan New York, NY and Japan, November 4, 2024 – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB), a commercial-stage biopharmaceutical company focused on the development and commercialization of novel radioimmunotherapy and antibody-based therapeutic prod

November 4, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 29, 2024 Y-MABS THERAPEUT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 29, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

November 4, 2024 EX-10.1

License Agreement, entered into on October 29, 2024 and effective October 23, 2024, by and between the Registrant and Nobelpharma, Co., Ltd. (incorporated by reference to Exhibit 10.1 to Registrant’s Form 8-K filed, November 4, 2024)

Exhibit 10.1 Certain information (marked as [***]) has been excluded from this exhibit because it is both (i) not material and (ii) is the type that the registrant treats as private or confidential. LICENSE AGREEMENT This License Agreement (this “Agreement”) is made and entered into as of October 23, 2024 (the “Effective Date”) by and between: Y-mAbs Therapeutics, Inc. (“Licensor”), a corporation

November 4, 2024 SC 13G/A

YMAB / Y-mAbs Therapeutics, Inc. / VANGUARD GROUP INC Passive Investment

SC 13G/A 1 UnitedStates13GY-mAbsTher.txt 240.13d-102 Schedule 13G - Information to be included in statements filed pursuant to 240.13d-1(b), (c), and (d) and amendments thereto filed pursuant to 240.13d-2. Securities and Exchange Commission, Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* (Name of Issuer) Y-mAbs Therapeutics Inc (Title of Class of S

September 26, 2024 CORRESP

September 26, 2024

September 26, 2024 United States Securities and Exchange Commission Division of Corporate Finance Office of Life Sciences Washington, D.

September 20, 2024 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 17, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or orga

September 17, 2024 8-K

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 11, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or orga

August 12, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 12, 2024 Y-MABS THERAPEUTI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 12, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiz

August 12, 2024 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (In thousands, except share and per share data)

Exhibit 99.1 Y-mAbs Reports Second Quarter 2024 Financial Results and Recent Corporate Developments ● Reported Total DANYELZA net product revenues of $22.8 million for the second quarter of 2024, representing a 10% YoY increase ● Continued geographic expansion of DANYELZA with new market revenues recorded in the second quarter from Brazil and Mexico; DANYELZA now approved in Hong Kong ● Part A of

August 12, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-38650 Y-mA

July 19, 2024 EX-10.1

Separation Agreement entered into on July 16, 2024, between Bo Kruse and Y-mAbs Therapeutics A/S (incorporated by reference to Exhibit 10.1 to Registrant’s Form 8-K filed, July 19, 2024)

Exhibit 10.1 15th July 2024 SEPARATION AGREEMENT BETWEEN Y-mAbs Therapeutics A/S (CVR no. 37053678) Agern Alle 11 2970 Hørsholm ("Company") AND Bo Kruse Ängavångsvägen 4 S-21851 Klagshamn Sverige (SE) ("BK” ) (jointly the "Parties" or individually the “Party”) 1. Termination of employment 1.1 Effective as of 1 October 2015, BK was employed by the Company as CFO on the terms and conditions set out

July 19, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 16, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizat

July 19, 2024 EX-10.2

Consultancy Agreement, entered into on July 16, 2024, between the Registrant and Investeringsselskabet GH ApS (incorporated by reference to Exhibit 10.2 to Registrant’s Form 8-K filed, July 19, 2024)

Exhibit 10.2 Consultancy agreement This consultancy agreement (the “Agreement”) has been made by and between: 1. Y-mAbs Therapeutics, Inc., a company limited by shares incorporated in the United States under corporate registration number 47-4619612 (the “Company”), with registered address at 230 Park Avenue, Suite 3350 New York, NY 10169, USA; and 2. Investeringsselskabet GH ApS, a company limited

July 1, 2024 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 27, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizat

July 1, 2024 EX-10.1

Employment Agreement, entered into on June 28, 2024, between the Registrant and Peter Pfreundschuh (incorporated by reference to Exhibit 10.1 to Registrant’s Form 8-K filed, July 1, 2024)

Exhibit 10.1 EMPLOYMENT AGREEMENT for PETER PFREUNDSCHUH This Employment Agreement (the “Agreement”) is made this 28th June, 2024 between Y-mAbs Therapeutics, Inc. (the “Company”) and Peter Pfreundschuh (the “Executive”) (collectively, the “Parties”). WHEREAS, the Company desires for Executive to provide services to the Company as well as its subsidiaries (together with the Company, the “Group”),

July 1, 2024 EX-99.1

Y-mAbs Appoints Seasoned Biopharma Executive Peter Pfreundschuh as Chief Financial Officer

Exhibit 99.1 Y-mAbs Appoints Seasoned Biopharma Executive Peter Pfreundschuh as Chief Financial Officer New York, NY, July 1, 2024 – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB), a commercial-stage biopharmaceutical company focused on the development and commercialization of novel radioimmunotherapy and antibody-based therapeutic products for the treatment of cancer, today

June 28, 2024 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 26, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizat

June 13, 2024 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 11, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizat

May 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-38650 Y-m

May 7, 2024 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (In thousands, except share and per share data)

Exhibit 99.1 Y-mAbs Reports First Quarter 2024 Financial Results and Recent Corporate Developments ● Reported U.S. DANYELZA® net product revenues of $18.6 million for the first quarter of 2024, representing a YoY increase of 11% ● Reported Worldwide DANYELZA net product revenues of $19.4 million for the first quarter of 2024, representing a 4% YoY decrease due to international volumes ● Cash and c

May 7, 2024 EX-10.3

Severance Agreement dated March 21, 2024 between Y-mAbs Therapeutics A/S and Steen Lisby (incorporated by reference to Exhibit 10.3 to Registrant’s Form 10-Q filed May 7, 2024)

Exhibit 10.3 The following severance agreement (the “Agreement”) has been entered into by Y-mAbs Therapeutics A/S CVR No. 37053678 Agern Allé 11 DK – 2970 Hørsholm (hereinafter the “Company”) and Steen Lisby Vibevang 2 DK – 2970 Hørsholm (hereinafter the “Employee”) (The Company and the Employee each a “Party” and together the “Parties”) SEVERANCE AGREEMENT 1. BACKGROUND 1.1 The Employee has been

May 7, 2024 EX-10.4

Amended and Restated Non-Employee Director Compensation Policy, effective April 26, 2024 (filed herewith)

Exhibit 10.4 Y-MABS THERAPEUTICS, INC. AMENDED AND RESTATED NON-EMPLOYEE DIRECTOR COMPENSATION POLICY The Board of Directors (the “Board”) of Y-mAbs Therapeutics, Inc. (the “Company”) has approved the following Amended and Restated Non-Employee Director Compensation Policy (the “Policy”), which establishes compensation to be paid to Non-Employee Directors (as defined below) of the Company, as an i

May 7, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 7, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizatio

April 29, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ⌧ Filed by a Party other than the Registrant ◻ Check the appropriate box: ◻ Preliminary Proxy Statement ◻ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ◻ Defin

April 29, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ⌧ Filed by a Party other than the Registrant ◻ Check the appropriate box: ◻ Preliminary Proxy Statement ◻ Confidential, for Use of the Commission Only (as permitted by Rule 14

April 29, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 25, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiza

April 8, 2024 SC 13G

YMAB / Y-mAbs Therapeutics, Inc. / Paradigm Biocapital Advisors LP - SC 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock, $0.0001 par value per share (Title of Class of Securities) 984241109 (CUSIP Number) March 27, 2024 (Date of Event Which Requires Filing of this statement) Check the appropriate box to designate the

April 8, 2024 EX-99.1

Joint Filing Agreement

Exhibit 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Common Stock, $0.

March 14, 2024 EX-99.1

Y-mAbs Therapeutics Announces Resignation of Chief Financial Officer

Exhibit 99.1 Y-mAbs Therapeutics Announces Resignation of Chief Financial Officer New York, NY, March 14, 2024 – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB), a commercial-stage biopharmaceutical company focused on the development and commercialization of novel radioimmunotherapy and antibody-based therapeutic products for the treatment of cancer, today announced that Chief

March 14, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 8, 2024 Y-MABS THERAPEUTICS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 8, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizat

March 4, 2024 EX-99.1

Y-mAbs Appoints Oncology Executive Mary Tagliaferri, M.D. to its Board of Directors

Exhibit 99.1 Y-mAbs Appoints Oncology Executive Mary Tagliaferri, M.D. to its Board of Directors Dr. Tagliaferri brings deep biopharmaceutical industry expertise and a successful track record in oncology therapeutic development New York, NY, March 4, 2024 – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB), a commercial-stage biopharmaceutical company focused on the development

March 4, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 29, 2024 Y-MABS THERAPEU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 29, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organ

February 29, 2024 EX-FILING FEES

Exhibit Fee Table

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Y-mAbs Therapeutics, Inc.

February 29, 2024 EX-97.1

Y-mAbs Therapeutics, Inc. Executive Compensation Recoupment Policy (filed herewith)

Exhibit 97.1 Y-MABS THERAPEUTICS, INC. INCENTIVE COMPENSATION RECOUPMENT POLICY 1.INTRODUCTION The Compensation Committee (the “Compensation Committee”) of the Board of Directors (the “Board”) of Y-mAbs Therapeutics, Inc. a Delaware corporation (the “Company”), has determined that it is in the best interests of the Company and its stockholders to adopt this Incentive Compensation Recoupment Policy

February 29, 2024 EX-4.2

Description of the registrant’s securities registered pursuant to section 12 of the Securities Exchange Act of 1934.

EXHIBIT 4.2 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of February 22, 2024, Y-mAbs Therapeutics, Inc. (“Y-mAbs,” “we,” “our” or “us”), had one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): our common stock, par value $0.0001 per share. The followin

February 29, 2024 EX-10.46

Form of Performance Restricted Stock Unit Award Grant Notice and Restricted Stock Unit Award Agreement under the 2018 Equity Incentive Plan

Exhibit 10.46 Y-MABS THERAPEUTICS, INC. 2018 EQUITY INCENTIVE PLAN PERRFORMANCE-BASED RESTRICTED STOCK UNIT AWARD GRANT NOTICE Y-mAbs Therapeutics, Inc., a Delaware corporation, (the “Company”), pursuant to its 2018 Equity Incentive Plan, as amended from time to time (the “Plan”), hereby grants to the holder listed below (the “Participant”), an award of performance-based restricted stock units (“P

February 29, 2024 EX-21.1

Subsidiary of the Registrant

Exhibit 21.1 Subsidiary of the Registrant Y-mAbs Therapeutics A/S (Denmark)

February 29, 2024 EX-10.34

Amendment to Employment Agreement for Dr. Vignesh Rajah, effective as of January 1, 2024 (filed herewith)

Exhibit 10.34 EMPLOYMENT AGREEMENT for Vignesh Rajah This Employment Agreement (the “Agreement”) is made between Y-mAbs Therapeutics, Inc. (the “Company”) and Vignesh Rajah (the “Executive”) (collectively, the “Parties”). WHEREAS, the Company desires for Executive to provide services to the Company as well as its subsidiaries (together with the Company, the “Group”), and wishes to provide Executiv

February 29, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023. OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-38

February 29, 2024 S-8

As filed with the Securities and Exchange Commission on February 29, 2024

As filed with the Securities and Exchange Commission on February 29, 2024 Registration No.

February 29, 2024 EX-99.1

Y-mAbs Reports Fourth Quarter and Full Year 2023 Financial Results and Recent Corporate Developments

Exhibit 99.1 Y-mAbs Reports Fourth Quarter and Full Year 2023 Financial Results and Recent Corporate Developments · Record DANYELZA® net product revenues of $23.4 million and $84.3 million for Q4 and FY 2023 represents YoY growth of 42% and 71%, respectively · Cash and cash equivalents of $78.6 million as of December 31, 2023; Reiterate anticipated cash runway into 2027 · Management announces full

February 29, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 29, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organ

February 14, 2024 EX-99.1

Joint Filing Agreement, dated as of February 14, 2024

EX-99.1 2 tm246115d1ex1.htm EXHIBIT 1 EXHIBIT 1 JOINT FILING AGREEMENT This Joint Filing Agreement (the “Agreement”) is made and entered into as of February 14, 2024, by and among WG Biotech ApS and Johan Wedell-Wedellsborg (collectively referred to herein as the “Filers”). Pursuant to and in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the Filers hereby agr

February 14, 2024 SC 13G/A

YMAB / Y-mAbs Therapeutics, Inc. / WG Biotech ApS - SC 13G/A Passive Investment

SC 13G/A 1 tm246115d1sc13g.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock, $0.0001 par value per share (Title of Class of Securities) 984241109 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement)

February 13, 2024 SC 13G/A

YMAB / Y-mAbs Therapeutics, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv02324-ymabstherapeuticsinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 1)* Name of issuer: Y-mAbs Therapeutics Inc Title of Class of Securities: Common Stock CUSIP Number: 984241109 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to

February 13, 2024 SC 13G/A

YMAB / Y-mAbs Therapeutics, Inc. / HBM Healthcare Investments (Cayman) Ltd. - SC 13G/A Passive Investment

SC 13G/A 1 tm245871d4sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 6)* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 984241109 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement

February 6, 2024 SC 13G/A

YMAB / Y-mAbs Therapeutics, Inc. / ACORN BIOVENTURES, L.P. - Y-MABS THERAPEUTICS, INC. Passive Investment

SC 13G/A 1 p24-0355sc13ga.htm Y-MABS THERAPEUTICS, INC. SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock, $0.0001 par value per share (Title of Class of Securities) 984241109 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statem

January 9, 2024 EX-99.1

Oncology Leadership in Pretargeted Radioimmunotherapy Platform and Antibody - based Therapies January 2024 Strongly Positioned to Drive Future Value 3 Novel Platforms in Development S elf - A ssembly D is A ssembly (“SADA”) Pretargeted Radioimmunothe

Exhibit 99.1 Oncology Leadership in Pretargeted Radioimmunotherapy Platform and Antibody - based Therapies January 2024 Disclaimer Statements in this presentation about future expectations, plans and prospects, as well as any other statements regarding matters that are not historical facts, constitute “forward - looking statements” within the meaning of Section 27 A of the Securities Act of 1933 a

January 9, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 8, 2024 Y-MABS THERAPEUTI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 8, 2024 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiz

November 13, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-38650

November 13, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 13, 2023 Y-MABS THERAPEU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 13, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organ

November 13, 2023 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (In thousands, except share and per share data)

Exhibit 99.1 Y-mAbs Reports Third Quarter 2023 Financial Results and Recent Corporate Developments · Q3 2023 DANYELZA® net product revenues of $20.0 million represents YoY growth of 59% · U.S. FDA clearance of IND for CD38-SADA for relapsed or refractory non-Hodgkin Lymphoma · Cash and cash equivalents of $86.6 million as of September 30, 2023, with anticipated cash runway extended into 2027 · Man

November 13, 2023 EX-10.1

Amendment, dated August 16, 2023, to Lease Agreement dated January 10, 2018, by and between the Registrant and RXR HB Owner LLC (incorporated by reference to Exhibit 10.1 to Registrant’s Form 10-Q filed November 13, 2023)

Exhibit 10.1 AMENDMENT TO LEASE This AMENDMENT TO LEASE (this “Amendment”) dated as of August 16th, 2023 (the “Effective Date”) between RXR HB OWNER LLC, having an office c/o RXR Realty LLC, 625 RXR Plaza, Uniondale, New York 11556 (“Landlord”), and Y-MABS THERAPEUTICS, INC., having an office at 230 Park Avenue, New York, New York 10169 (“Tenant”). W I T N E S E T H: WHEREAS, Landlord and Tenant e

October 18, 2023 EX-99.1

Y-mAbs Names Michael Rossi as President and Chief Executive Officer and Director

Exhibit 99.1 Y-mAbs Names Michael Rossi as President and Chief Executive Officer and Director New York, NY, October 18, 2023 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, announced today th

October 18, 2023 EX-10.2

Employee Confidential Information and Inventions Assignment Agreement, dated October 17, 2023, between the Registrant and Michael Rossi (incorporated by reference to Exhibit 10.2 to Registrant’s Form 8-K filed October 18, 2023)

Exhibit 10.2 Y-MABS THERAPEUTICS, INC. EMPLOYEE CONFIDENTIAL INFORMATION AND INVENTIONS ASSIGNMENT AGREEMENT In consideration of my employment or continued employment by Y-mAbs Therapeutics, Inc. (“Employer”), and its subsidiaries, parents, affiliates, successors, and assigns (together with Employer, “Company”), the compensation paid to me now and during my employment with Company, and Company’s a

October 18, 2023 EX-99.1

Y-mAbs Therapeutics Announces U.S. FDA Clearance of Investigational New Drug Application for CD38-SADA

Exhibit 99.1 Y-mAbs Therapeutics Announces U.S. FDA Clearance of Investigational New Drug Application for CD38-SADA Clearance of CD38-SADA IND marks the second clinical development program utilizing the Company’s novel SADA technology platform New York, NY, October 17, 2023 – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused o

October 18, 2023 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 17, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

October 18, 2023 EX-10.1

Employment Agreement entered into on October 17, 2023, between the Registrant and Michael Rossi (incorporated by reference to Exhibit 10.1 to Registrant’s Form 8-K filed October 18, 2023).

Exhibit 10.1 EMPLOYMENT AGREEMENT for MICHAEL ROSSI This Employment Agreement (the “Agreement”) is made between Y-mAbs Therapeutics, Inc. (the “Company”) and Michael Rossi (the “Executive”) (collectively, the “Parties”). Whereas, the Company desires for Executive to provide services to the Company as well as its subsidiaries (together with the Company, the “Group”), and wishes to provide Executive

October 18, 2023 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 12, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

August 10, 2023 EX-99.1

Y-mAbs Reports Second Quarter 2023 Financial Results and Recent Corporate Developments

Exhibit 99.1 Y-mAbs Reports Second Quarter 2023 Financial Results and Recent Corporate Developments · Q2 2023 DANYELZA® record net product revenues of $20.8 million, driving YoY growth of 112% and a 3% sequential increase compared to Q1 2023 · Management reiterates FY 2023 financial guidance · DANYELZA marketing authorization granted in Brazil · Ongoing patient recruitment in the Phase I GD2-SADA

August 10, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 10, 2023 Y-MABS THERAPEUTI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 10, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiz

August 10, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-38650 Y-mA

June 9, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 8, 2023 Y-MABS THERAPEUTICS,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 8, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizati

May 26, 2023 EX-99.1

Y-mAbs Announces Presentation of Naxitamab Data at ASCO

Exhibit 99.1 Y-mAbs Announces Presentation of Naxitamab Data at ASCO New York, NY, May 26, 2023 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced that a poster presentation feat

May 26, 2023 EX-99.2

Y-mAbs Announces Presentation of GD2-SADA Study at ASCO

Exhibit 99.2 Y-mAbs Announces Presentation of GD2-SADA Study at ASCO New York, NY, May 26, 2023 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced that a poster presentation feat

May 26, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 26, 2023 Y-MABS THERAPEUTICS,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 26, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizati

May 23, 2023 EX-99.1

Y-mAbs’ DANYELZA

Exhibit 99.1 Y-mAbs’ DANYELZA® (naxitamab-gqgk) for the Treatment of High-Risk Neuroblastoma approved in Brazil New York, NY, May 23, 2023 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, toda

May 23, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 23, 2023 Y-MABS THERAPEUTICS,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 23, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizati

May 8, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 8, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizatio

May 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-38650 Y-m

May 8, 2023 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (In thousands, except share and per share data)

Exhibit 99.1 Y-mAbs Reports First Quarter 2023 Financial Results and Recent Corporate Developments and Updates 2023 Financial Guidance ● Q1 2023 DANYELZA® record net product revenues of $20.3 million, driving YoY growth of 93% and a 24% sequential increase compared to Q4 2022 ● Management updates 2023 financial guidance, now anticipating higher DANYELZA net revenues of $80-85 million and lower cas

May 2, 2023 CORRESP

Y-mAbs Therapeutics, Inc. 230 Park Avenue, Suite 3350 New York, NY 10169

Y-mAbs Therapeutics, Inc. 230 Park Avenue, Suite 3350 New York, NY 10169 May 2, 2023 Via EDGAR U.S. Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Attn: Daniel Crawford Re: Y-mAbs Therapeutics, Inc. Registration Statement on Form S-3 (File No. 333-271006) Request for Acceleration of Effective Date Mr. Crawford: In accordance with Rule 4

April 28, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.       )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.       ) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ¨

April 28, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.       )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.       ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by R

April 18, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 18, 2023 Y-MABS THERAPEUTIC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 18, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiza

April 18, 2023 EX-99.1

Y-mAbs Announces Presentation of Naxitamab data at AACR

Exhibit 99.1 Y-mAbs Announces Presentation of Naxitamab data at AACR New York, NY, April 18, 2023 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced that a poster presentation fe

April 5, 2023 EX-99.1

Y-mAbs Announces First Patient Dosed in Phase 1 Clinical Trial of GD2-SADA

Exhibit 99.1 Y-mAbs Announces First Patient Dosed in Phase 1 Clinical Trial of GD2-SADA New York, NY, April 5, 2023 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced that the fi

April 5, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 5, 2023 Y-MABS THERAPEUTICS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 5, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizat

April 3, 2023 SC 13G

YMAB / Y-Mabs Therapeutics Inc / ACORN BIOVENTURES, L.P. - Y-MABS THERAPEUTICS, INC. Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock, $0.0001 par value per share (Title of Class of Securities) 984241109 (CUSIP Number) March 15, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant

March 30, 2023 EX-10.41

Non-Employee Director Compensation Policy, adopted on January 17, 2023 (incorporated by reference to Exhibit 10.41 to Registrant’s Form 10-K filed March 30, 2023).

EXHIBIT 10.41 Y-MABS THERAPEUTICS, INC. AMENDED AND RESTATED NON-EMPLOYEE DIRECTOR COMPENSATION POLICY The Board of Directors (the “Board”) of Y-mAbs Therapeutics, Inc. (the “Company”) has approved the following Amended and Restated Non-Employee Director Compensation Policy (the “Policy”), which establishes compensation to be paid to Non-Employee Directors (as defined below) of the Company, as an

March 30, 2023 S-8

As filed with the Securities and Exchange Commission on March 30, 2023

As filed with the Securities and Exchange Commission on March 30, 2023 Registration No.

March 30, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022. OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-38

March 30, 2023 EX-4.4

Description of the registrant’s securities registered pursuant to section 12 of the Securities Exchange Act of 1934

EXHIBIT 4.4 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of March 23, 2023, Y-mAbs Therapeutics, Inc. (“Y-mAbs,” “we,” “our” or “us”), had one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): our common stock, par value $0.0001 per share. The following s

March 30, 2023 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (In thousands, except share and per share data)

Exhibit 99.1 Y-mAbs Reports Fourth Quarter and Full-Year 2022 Financial Results and Recent Corporate Developments ● Q4 2022 DANYELZA® record net product revenues of $16.4 million, driving YoY growth of 71% and 31% sequential increase compared to Q3 2022 ● DANYELZA conditional marketing authorization granted in China ● Management reiterates 2023 financial guidance ● First ever SADA Phase I trial op

March 30, 2023 EX-FILING FEES

Exhibit Fee Table

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Y-mAbs Therapeutics, Inc.

March 30, 2023 EX-21.1

Subsidiaries of the Registrant

EX-21.1 5 ymab-20221231xex21d1.htm EX-21.1 Exhibit 21.1 Subsidiaries of the Registrant Y-mAbs Therapeutics A/S (Denmark) Y-mAbs Therapeutics (Cayman Islands) Y-mAbs Therapeutics Limited (United Kingdom) Note: Y-mAbs Therapeutics (Cayman Islands) and Y-mAbs Therapeutics Limited (United Kingdom) are dormant entities without any operations and holding no assets.

March 30, 2023 EX-10.42

Employment Agreement for Ms. Susan Smith, effective as of January 1, 2022 (filed herewith).

Exhibit 10.42 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (the “Agreement”) is entered into this [xx] day of December 2021 (the “Effective Date”), between SUE SMITH, whose principal residence is located at [***](the “Employee”), and Y-MABS THERAPEUTICS, INC., with its principal place of business located at 230 Park Avenue, Suite 3350, New York, New York 10169 (the “Company”) (the Employee and t

March 30, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 30, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiza

March 30, 2023 EX-4.10

Form of Indenture, between the Registrant and one or more trustees to be named

Exhibit 4.10 Y-mAbs Therapeutics, Inc. Issuer AND [TRUSTEE], Trustee INDENTURE Dated as of [●], 20 Debt Securities TABLE OF CONTENTS PAGE ARTICLE 1 DEFINITIONS 1 Section 1.01 Definitions of Terms 1 ARTICLE 2 ISSUE, DESCRIPTION, TERMS, EXECUTION, REGISTRATION AND EXCHANGE OF SECURITIES 5 Section 2.01 Designation and Terms of Securities 5 Section 2.02 Form of Securities and Trustee’s Certificate 8 S

March 30, 2023 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) Y-mAbs Therapeutics, Inc.

March 30, 2023 S-3

As filed with the Securities and Exchange Commission on March 30, 2023

Table of Contents As filed with the Securities and Exchange Commission on March 30, 2023 Registration No.

March 13, 2023 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 13, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiza

February 14, 2023 SC 13G

YMAB / Y-mAbs Therapeutics, Inc / WG Biotech ApS - SC 13G Passive Investment

SC 13G 1 tm236789d1sc13g.htm SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock, $0.0001 par value per share (Title of Class of Securities) 984241109 (CUSIP Number) December 31, 2019 (Date of Event Which Requires Filing of this Statement) Chec

February 14, 2023 SC 13G/A

YMAB / Y-mAbs Therapeutics, Inc / HBM Healthcare Investments (Cayman) Ltd. - SC 13G/A Passive Investment

SC 13G/A 1 tm235913d4sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5)* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 984241109 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement

February 14, 2023 EX-99.1

JOINT FILING AGREEMENT

EX-99.1 2 tm236789d1ex99-1.htm EXHIBIT 1 EXHIBIT 1 JOINT FILING AGREEMENT This Joint Filing Agreement (the “Agreement”) is made and entered into as of February 14, 2023, by and among WG Biotech ApS and Johan Wedell-Wedellsborg (collectively referred to herein as the “Filers”). Pursuant to and in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the Filers hereby

February 9, 2023 SC 13G

YMAB / Y-mAbs Therapeutics, Inc / VANGUARD GROUP INC - SCHEDULE 13G Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 Name of issuer: Y-mAbs Therapeutics Inc. Title of Class of Securities: Common Stock CUSIP Number: 984241109 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule 13d-1(b)

February 2, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 2, 2023 Y-MABS THERAPEUT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 2, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

February 2, 2023 EX-99.1

Y-mAbs and the European Medicines Agency Reach Agreement on the Pediatric Investigation Plan for Naxitamab

Exhibit 99.1 Y-mAbs and the European Medicines Agency Reach Agreement on the Pediatric Investigation Plan for Naxitamab New York, NY, February 2, 2023 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of

January 4, 2023 8-K

Regulation FD Disclosure, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): January 3, 2023 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiz

January 4, 2023 EX-99.1

Y-mAbs Announces Restructuring Plan and Provides Financial Outlook Following Complete Response Letter from FDA

Exhibit 99.1 Y-mAbs Announces Restructuring Plan and Provides Financial Outlook Following Complete Response Letter from FDA ? Estimated 28% reduction in annual operating expenses for 2023 compared to previously announced guidance for 2022 of $162-167 million; ? Estimated total cash burn for 2023, including restructuring expenses, expected to be $50-55 million, expected to extend cash runway into Q

December 21, 2022 EX-99.1

Y-mAbs Announces Partnership regarding Early Access Program for DANYELZA (naxitamab-gqgk) in Europe

Exhibit 99.1 Y-mAbs Announces Partnership regarding Early Access Program for DANYELZA (naxitamab-gqgk) in Europe New York, NY, December 21, 2022 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer

December 21, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 21, 2022 Y-MABS THERAPEU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 21, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organ

December 16, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 16, 2022 Y-MABS THERAPEU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 16, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organ

December 16, 2022 EX-99.1

The CHMP has Adopted a Negative Opinion for Omburtamab for the Treatment of CNS/LM Metastasis from Neuroblastoma in Europe

Exhibit 99.1 The CHMP has Adopted a Negative Opinion for Omburtamab for the Treatment of CNS/LM Metastasis from Neuroblastoma in Europe NEW YORK, December 16, 2022 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the

December 14, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 14, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organ

December 14, 2022 EX-99.1

Y-mAbs Announces Pipeline Update

Exhibit 99.1 Y-mAbs Announces Pipeline Update New York, NY, December 14, 2022 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced that a clinical update for naxitamab and the Comp

December 8, 2022 EX-99.1

Y-mAbs’ DANYELZA

Exhibit 99.1 Y-mAbs? DANYELZA? (naxitamab-gqgk) for the Treatment of High-Risk Neuroblastoma approved in China New York, NY, December 8, 2022 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, t

December 8, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 8, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

December 2, 2022 EX-99.1

Y-mAbs Announces Complete Response Letter for Omburtamab Biologics License Application

Exhibit 99.1 Y-mAbs Announces Complete Response Letter for Omburtamab Biologics License Application New York, NY, December 1, 2022 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announ

December 2, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 1, 2022 Y-MABS THERAPEUT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 1, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

November 7, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 7, 2022 Y-MABS THERAPEUT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 7, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

November 7, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

November 7, 2022 EX-10.1

Form of Stock Option Grant Notice and Stock Option Agreement under the 2018 Equity Incentive Plan.

Exhibit 10.1 Y-MABS THERAPEUTICS, INC. 2018 EQUITY INCENTIVE PLAN STOCK OPTION GRANT NOTICE Y-mAbs Therapeutics, Inc. a Delaware corporation, (the ?Company?), pursuant to its 2018 Equity Incentive Plan, as may be amended from time to time (the ?Plan?), hereby grants to the holder listed below (?Participant?), an option to purchase the number of shares of the Company?s Common Stock (the ?Shares?),

November 7, 2022 EX-10.3

Separation Agreement and General Release, effective as of September 22, 2022, between Y-mAbs Therapeutics, Inc. and Claus Juan Møller San Pedro

Exhibit 10.3 SEPARATION AGREEMENT AND GENERAL RELEASE ? This Separation Agreement and General Release (the ?Agreement?) is made and entered into by and between Y-mAbs Therapeutics, Inc. (the ?Company?), located at 230 Park Avenue, Suite 3350, New York, NY 10169, and its employee, Claus Juan M?ller San Pedro (?Employee?), who resides at [***]. ? WHEREAS, Employee has been employed by the Company as

November 7, 2022 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (in thousands, except share data)

Exhibit 99.1 Y-mAbs Reports Third Quarter 2022 Financial Results and Recent Corporate Developments · Q3 2022 DANYELZA® record product revenues of $12.5 million, YoY growth of 40% and 28% sequential increase compared to Q2 2022 · DANYELZA marketing authorization granted in Israel; regulatory filing submitted in Brazil · Management reiterates financial guidance, including anticipated 2022 full-year

November 7, 2022 EX-10.2

Form of Stock Option Grant Notice and Stock Option Agreement for directors under the 2018 Equity Incentive Plan.

Exhibit 10.2 Y-MABS THERAPEUTICS, INC. 2018 EQUITY INCENTIVE PLAN STOCK OPTION GRANT NOTICE Y-mAbs Therapeutics, Inc. a Delaware corporation, (the ?Company?), pursuant to its 2018 Equity Incentive Plan, as may be amended from time to time (the ?Plan?), hereby grants to the holder listed below (?Participant?), an option to purchase the number of shares of the Company?s Common Stock (the ?Shares?),

October 28, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 28, 2022 Y-MABS THERAPEUT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 28, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

October 28, 2022 EX-99.1

Y-mAbs Announces Outcome of FDA Advisory Committee Meeting on Omburtamab

Exhibit 99.1 Y-mAbs Announces Outcome of FDA Advisory Committee Meeting on Omburtamab New York, NY, October 28, 2022 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced the outcom

October 3, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 3, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiz

October 3, 2022 EX-99.1

Y-mAbs Announces Pivotal Data for Omburtamab

Exhibit 99.1 Y-mAbs Announces Pivotal Data for Omburtamab New York, NY, October 3, 2022 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced clinical data on the Company?s product

September 26, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 22, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or orga

September 26, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 26, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or orga

September 26, 2022 EX-99.1

Y-mAbs Announces Regulatory Filing for DANYELZA® (naxitamab-gqgk) in Brazil

Exhibit 99.1 Y-mAbs Announces Regulatory Filing for DANYELZA? (naxitamab-gqgk) in Brazil New York, NY, September 26, 2022 (GLOBE NEWSWIRE) ?Y-mAbs Therapeutics, Inc. (?Y-mAbs?, NASDAQ: YMAB), a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced that Adium Pharma S.A.

September 2, 2022 EX-99.1

Y-mAbs Announces Scheduling of FDA Advisory Committee Meeting for Omburtamab

Exhibit 99.1 Y-mAbs Announces Scheduling of FDA Advisory Committee Meeting for Omburtamab New York, NY, September 1, 2022 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced that

September 2, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 2, 2022 (September 1, 2022) Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of in

August 30, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 30, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiz

August 30, 2022 EX-99.1

Y-mAbs and Takeda Announces Marketing Authorization in Israel for DANYELZA® (naxitamab-gqgk) for Neuroblastoma

Exhibit 99.1 Y-mAbs and Takeda Announces Marketing Authorization in Israel for DANYELZA® (naxitamab-gqgk) for Neuroblastoma New York, NY, and PETAH TIKVA, Israel, August 30, 2022 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic pr

August 8, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

August 8, 2022 EX-10.1

Form of Stock Option Grant Notice and Stock Option Agreement under the 2018 Equity Incentive Plan (incorporated by reference to Exhibit 10.1 to Registrant’s Form 10-Q filed August 8, 2022)

Exhibit 10.1 Y-MABS THERAPEUTICS, INC. 2018 EQUITY INCENTIVE PLAN STOCK OPTION GRANT NOTICE Y-mAbs Therapeutics, Inc. a Delaware corporation, (the “Company”), pursuant to its 2018 Equity Incentive Plan, as may be amended from time to time (the “Plan”), hereby grants to the holder listed below (“Participant”), an option to purchase the number of shares of the Company’s Common Stock (the “Shares”),

August 8, 2022 EX-10.2

Retention Bonus Agreement, dated May 30, 2022 by and between EVP and Chief Financial Officer, Bo Kruse and Y-mAbs Therapeutics A/S (incorporated by reference to Exhibit 10.2 to Registrant’s Form 10-Q filed August 8, 2022)

? Exhibit 10.2 ? May 30, 2022 VIA EMAIL Bo Kruse ? ? Re: Retention Bonus ? Dear Bo We are pleased to inform you that, in recognition of your contributions to Y-mAbs Therapeutics A/S (the ?Company?), you are being offered the opportunity to receive a retention bonus (the ?Retention Bonus?) on the following terms and conditions: 1. Payment of Retention Bonus. Subject to satisfaction of the condition

August 8, 2022 EX-10.3

Form of Retention Bonus Agreement of Y-mAbs Therapeutics A/S (incorporated by reference to Exhibit 10.3 to Registrant’s Form 10-Q filed August 8, 2022)

Exhibit 10.3 [ ] VIA EMAIL [ ] Re: Retention Bonus Dear [ ] We are pleased to inform you that, in recognition of your contributions to Y-mAbs Therapeutics A/S (the “Company”), you are being offered the opportunity to receive a retention bonus (the “Retention Bonus”) on the following terms and conditions: 1. Payment of Retention Bonus. Subject to satisfaction of the conditions set forth below, you

August 8, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 8, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organiza

August 8, 2022 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (in thousands, except share data)

Exhibit 99.1 Y-mAbs Announces Second Quarter Financial Results and Recent Corporate Developments ? Omburtamab BLA Accepted by the FDA with November 2022 PDUFA date ? Announced IND Clearance for the first GD2-SADA construct ? YTD DANYELZA? product revenue $20.3 million ? Management reiterates financial guidance, including 2022 full-year DANYELZA? revenue of $45-$50 million ? Strong cash position wi

August 8, 2022 EX-10.4

Form of Retention Bonus Agreement of Y-mAbs Therapeutics, Inc. (incorporated by reference to Exhibit 10.4 to Registrant’s Form 10-Q filed August 8, 2022)

? EXHIBIT 10.4 ? [ ]VIA EMAIL [ ] ? Re: Retention Bonus ? Dear [ ] We are pleased to inform you that, in recognition of your contributions to Y-mAbs Therapeutics, Inc. (the ?Company?), you are being offered the opportunity to receive a retention bonus (the ?Retention Bonus?) on the following terms and conditions: 1. Payment of Retention Bonus. Subject to satisfaction of the conditions set forth be

July 12, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 12, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizat

July 12, 2022 EX-99.1

Y-mAbs’ Announces Clearance of IND for GD2-SADA

Exhibit 99.1 Y-mAbs? Announces Clearance of IND for GD2-SADA New York, NY, July 12, 2022 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced initiation of its first clinical trial

June 13, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 13, 2022 (June 9, 2022) Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporati

June 2, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 2, 2022 (May 30, 2022) Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporatio

May 31, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 31, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizati

May 31, 2022 EX-99.1

Y-mAbs Announces FDA Acceptance of Biologics License Application for OMBLASTYS® (omburtamab) for the Treatment of Neuroblastoma for Priority Review

Exhibit 99.1 Y-mAbs Announces FDA Acceptance of Biologics License Application for OMBLASTYS® (omburtamab) for the Treatment of Neuroblastoma for Priority Review New York, NY, May 31, 2022 (GLOBE NEWSWIRE) – Y-mAbs Therapeutics, Inc. (the “Company” or “Y-mAbs”) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based thera

May 26, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 26, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizati

May 26, 2022 EX-99.1

Y-mAbs Announces Naxitamab Chemoimmunotherapy Investigational Trial for High-Risk Neuroblastoma Meets Primary Endpoint

Exhibit 99.1 Y-mAbs Announces Naxitamab Chemoimmunotherapy Investigational Trial for High-Risk Neuroblastoma Meets Primary Endpoint New York, NY, May 26, 2022 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treat

May 19, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 19, 2022 (May 18, 2022) Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporatio

May 9, 2022 EX-10.9

Amendment to Employment Agreement for Dr. Steen Lisby, effective as of June 1, 2020 (incorporated by reference to Exhibit 10.9 to Registrant’s Form 10-Q filed, May 9, 2022)

? Exhibit 10.9 ? ADDENDUM TO EMPLOYMENT CONTRACT ? Between ? Y-mAbs Therapeutics A/S Agern Alle 11 2970 H?rsholm (the "Employer") and Steen Lisby [***] ? (the "Employee") ? (collectively the "Parties") ? With effect from June 1, 2020, the Employment Contract entered into between the Parties (with previous amendments, the "Employment Contract") shall be amended as follows: ? 1. New Position/Work Re

May 9, 2022 EX-10.11

Amendment to Employment Agreement for Dr. Vignesh Rajah, effective as of March 1, 2021 (incorporated by reference to Exhibit 10.11 to Registrant’s Form 10-Q filed, May 9, 2022)

Exhibit 10.11 ADDENDUM TO EMPLOYMENT CONTRACT Between Y-mAbs Therapeutics A/S Agern All? 11 2970 H?rsholm (the ?Employer") and ? Vignesh Rajah (the ?Employee?) (collectively the ?Parties") With effect from March 10, 2021, the Employment Contract entered into between the Parties (with previous amendments, the ?Employment Contract?) shall be amended as follows: ? 1. Additional Clause (take-over prot

May 9, 2022 EX-10.7

Amendment No. 2, dated March 18, 2021 to License Agreement, dated as of August 20, 2015 between Registrant and Memorial Sloan Kettering Cancer Center (incorporated by reference to Exhibit 10.7 to Registrant’s Form 10-Q filed, May 6, 2022)

Certain information (marked as [***]) has been excluded from this exhibit because it is both (i) not material and (ii) would be competitively harmful if publicly disclosed.

May 9, 2022 EX-10.10

Employment Agreement for Dr. Vignesh Rajah, effective as of June 2, 2020 (incorporated by reference to Exhibit 10.10 to Registrant’s Form 10-Q filed, May 9, 2022)

Exhibit 10.10 EMPLOYMENT CONTRACT Between Y-mAbs Therapeutics A/5 Agern Alle 11 2970 H?rsholm (the "Employer") and Dr. Vignesh Rajah? [***] (the "Employee") (collectively the "Parties") 1. Period of employment, Title, Reporting Person 1.1 The Employee is employed as of June 2nd, 2020 by the Employer, a company engaged in drug development. 1.2 The Employee is employed as Senior Vice President and C

May 9, 2022 EX-10.8

Employment Agreement for Dr. Steen Lisby, effective as of August 1, 2017 (incorporated by reference to Exhibit 10.8 to Registrant’s Form 10-Q filed, May 9, 2022)

Exhibit 10.8 EMPLOYMENT CONTRACT Between Y-mAbs Therapeutics A/S Rungsted Strandvej 113 2960 Rungsted Kyst (hereinafter referred to as "the Employer ") and Steen Lisby [***] (hereinafter referred to as "the Employee") (hereinafter collectively referred to as "the Parties") have today entered into the following EMPLOYMENT CONTRACT 1. Period of employment 1.1 The Employee is employed as of August 1s

May 9, 2022 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (in thousands, except share data)

Exhibit 99.1 Y-mAbs Announces First Quarter Financial Results and Recent Corporate Developments ? Completed resubmission to the FDA of omburtamab BLA ? DANYELZA? adoption drove a 9% sequential revenue increase to $10.5 million ? Company issues 2022 full-year DANYELZA? revenue guidance of $45-$50 million ? Strong cash position with $156.7 million as of March 31, 2022, providing runway through mid-2

May 9, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 9, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizatio

May 9, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

April 29, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)

April 29, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.       )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ??????) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? ? Confidential, for Use of the Commission Only (as permitted by

April 27, 2022 EX-99.1

Y-mAbs Announces Executive Management Changes and Provides 2022 Revenue Guidance and Financial Update

Exhibit 99.1 Y-mAbs Announces Executive Management Changes and Provides 2022 Revenue Guidance and Financial Update ? CEO and Board Member Dr. Claus Moller has stepped down; Thomas Gad, Founder, Chairman and President assumes Interim CEO role and steps down as Chairman; Dr. Jim Healy to be appointed as Chairman ? DANYELZA? first quarter revenues were $10.5 million, up 9% sequentially quarter over q

April 27, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 27, 2022 (April 22, 2022) Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorpor

April 11, 2022 SC 13G/A

YMAB / Y-mAbs Therapeutics, Inc / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4 )* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 984241109 (CUSIP Number) March 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this

April 1, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 1, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organizat

April 1, 2022 EX-99.1

Y-mAbs Announces Submission of Omburtamab Biologics License Application to FDA

Exhibit 99.1 Y-mAbs Announces Submission of Omburtamab Biologics License Application to FDA New York, NY, April 1, 2022 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced that on

March 1, 2022 EX-4.4

Description of the registrant’s securities registered pursuant to section 12 of the Securities Exchange Act of 1934.

EXHIBIT 4.4 DESCRIPTION OF THE REGISTRANT?S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of February 22, 2022, Y-mAbs Therapeutics, Inc. (?Y-mAbs,? ?we,? ?our? or ?us?), had one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the ?Exchange Act?): our common stock, par value $0.0001 per share. The followin

March 1, 2022 EX-21.1

Subsidiaries of the Registrant.

Exhibit 21.1 Subsidiaries of the Registrant Y-mAbs Therapeutics A/S (Denmark) ? Y-mAbs Therapeutics (Cayman Islands) ? Y-mAbs Therapeutics Limited (United Kingdom) ? Note: Y-mAbs Therapeutics (Cayman Islands) and Y-mAbs Therapeutics Limited (United Kingdom) are dormant entities without any operations and holding no assets.

March 1, 2022 10-K

l UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents l ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

February 25, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 24, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organ

February 25, 2022 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (in thousands, except share data)

EX-99.1 2 tm227665d1ex99-1.htm EXHIBIT 99.1 Exhibit 99.1 Y-mAbs Reports Fourth Quarter and Full Year 2021 Financial Results and Recent Corporate Developments · Announced completion of pre-BLA meeting with the FDA for omburtamab BLA resubmission expected by the end of first quarter 2022 · DANYELZA® adoption drives sequential revenue increase · Completed IND submission to the FDA for first SADA cons

February 15, 2022 SC 13D/A

YMAB / Y-mAbs Therapeutics, Inc / Sofinnova Venture Partners X, L.P. - SC 13D/A Activist Investment

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D (RULE 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a) (Amendment No. 1)* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 984241109 (CUSIP Number) Nathalie Auber Sofinnova Investments

February 11, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 11, 2022 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organ

February 11, 2022 EX-99.1

Y-mAbs Announces Completion of Pre-BLA Meeting with FDA for Omburtamab

Exhibit 99.1 Y-mAbs Announces Completion of Pre-BLA Meeting with FDA for Omburtamab New York, NY, February 11, 2022 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced that it rec

February 7, 2022 SC 13G/A

YMAB / Y-mAbs Therapeutics, Inc / HBM Healthcare Investments (Cayman) Ltd. - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4)* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 984241109 (CUSIP Number) December 31, 2021 & January 28, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriat

February 4, 2022 SC 13G/A

YMAB / Y-mAbs Therapeutics, Inc / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3 )* Y-mAbs Therapeutics, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 984241109 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which t

December 17, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 16, 2021 (December 14, 2021) Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of in

December 15, 2021 EX-99.1

Y-mAbs Announces Pipeline Update

Exhibit 99.1 Y-mAbs Announces Pipeline Update New York, NY, December 15, 2021 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today announced that clinical experience for naxitamab and data f

December 15, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): December 15, 2021 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organ

November 24, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 22, 2021 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organ

November 4, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 4, 2021 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

November 4, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 4, 2021 Y-MABS THERAPEUTICS, INC. (Exact name of registrant as specified in its charter) Delaware 001-38650 47-4619612 (State or other jurisdiction of incorporation or organi

November 4, 2021 EX-99.1

Y-mAbs Provides Regulatory Update on Omburtamab for the Treatment of Patients with Neuroblastoma CNS/LM Metastasis

Exhibit 99.1 Y-mAbs Provides Regulatory Update on Omburtamab for the Treatment of Patients with Neuroblastoma CNS/LM Metastasis New York, NY, November 4, 2021 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treat

November 4, 2021 EX-99.1

Y-MABS THERAPEUTICS, INC. Consolidated Balance Sheets (in thousands, except share data)

Exhibit 99.1 Y-mAbs Announces Third Quarter Financial Results and Recent Corporate Developments New York, NY, November 4, 2021 (GLOBE NEWSWIRE) ? Y-mAbs Therapeutics, Inc. (the ?Company? or ?Y-mAbs?) (Nasdaq: YMAB) a commercial-stage biopharmaceutical company focused on the development and commercialization of novel, antibody-based therapeutic products for the treatment of cancer, today reported f

November 4, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

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