MKSI / MKS Inc. - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

MKS Inc.
US ˙ NasdaqGS ˙ US55306N1046

Mga Batayang Estadistika
LEI 549300KEQATBHAGVF505
CIK 1049502
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 MKS 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.
August 7, 2025 EX-4.1

Specimen certificate representing the Common Stock

EXHIBIT 4.1

August 7, 2025 10-Q

FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ 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 0-23621 MKS INC.

August 6, 2025 8-K

FORM 8-K Item 2.02 Results of Operations and Financial Condition. Item 9.01 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): August 06, 2025 MKS INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commission File Numb

August 6, 2025 EX-99.1

MKS Inc. Reports Second Quarter 2025 Financial Results

EXHIBIT 99.1 MKS Inc. Reports Second Quarter 2025 Financial Results • Revenue of $973 million, above the high end of guidance • GAAP net income of $62 million and net income per diluted share of $0.92, each above the midpoint of guidance • Adjusted EBITDA of $240 million, above the high end of guidance, and Non-GAAP net earnings per diluted share of $1.77, at the high end of guidance Andover, MA,

May 29, 2025 EX-1.01

Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form

Exhibit 1.01 MKS INC. Conflict Minerals Report For the Year Ended December 31, 2024 Special Note Regarding Forward-Looking Statements This report contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act

May 29, 2025 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT MKS Inc. (Exact name of the registrant as specified in its charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT MKS Inc. (Exact name of the registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation or organization) (Commission File Number) (IRS Employer Identification No.) 01810 2 Tech Drive, Andover, Massachusetts (Address of principal

May 15, 2025 EX-3.1

Restated Articles of Organization

Exhibit 3.1 The Commonwealth of Massachusetts William Francis Galvin Secretary of the Commonwealth One Ashburton Place, Boston, Massachusetts 02108-1512 Restated Articles of Organization (General Laws Chapter 156D, Section 10.07; 950 CMR 113.35) (1) Exact name of corporation: MKS Instruments, Inc. (2) Registered office address: c/o Cogency Global Inc., 45 School Street, Suite 202, Boston, MA 02108

May 15, 2025 EX-99.1

MKS Instruments Announces Change of Corporate Name to MKS Inc.

Exhibit 99.1 MKS Instruments Announces Change of Corporate Name to MKS Inc. ANDOVER, Mass., May 15, 2025 (GLOBE NEWSWIRE) - MKS Instruments, Inc. (NASDAQ: MKSI) (“MKS”), a global provider of enabling technologies that transform our world, announced today that its shareholders have approved the change of the Company’s name to “MKS Inc.” and the change is effective May 16, 2025. John T.C. Lee, Presi

May 15, 2025 EX-3.2

Amendments to Second Amended and Restated By-Laws

Exhibit 3.2 AMENDMENTS TO SECOND AMENDED AND RESTATED BY-LAWS OF MKS INC. 1. The name of the Corporation where it appears on the cover page of the Second Amended and Restated By-Laws is deleted in its entirety and replaced with the following: MKS INC. 2. Article VIII of the Second Amended and Restated By-Laws is deleted in its entirety and replaced with the following: ARTICLE VIII AMENDMENTS These

May 15, 2025 8-K

FORM 8-K Item 3.03 Material Modification to Rights of Security Holders. Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. Item 5.03 Amendments

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 12, 2025 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commission

May 8, 2025 10-Q

FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ 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 0-23621 MKS INSTRUMENTS, INC.

May 7, 2025 8-K

FORM 8-K Item 2.02 Results of Operations and Financial Condition. Item 9.01 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): May 07, 2025 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commission

May 7, 2025 EX-99.1

MKS Instruments Reports First Quarter 2025 Financial Results

EXHIBIT 99.1 MKS Instruments Reports First Quarter 2025 Financial Results • Quarterly revenue of $936 million, at the high end of guidance • Quarterly GAAP net income of $52 million and net income per diluted share of $0.77, each above the midpoint of guidance • Quarterly Adjusted EBITDA of $236 million, at the high end of guidance, and Non-GAAP net earnings per diluted share of $1.71, above the h

April 1, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amend

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

April 1, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amend

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 21, 2025 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amend

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

February 25, 2025 EX-10.9

Form of Restricted Stock Unit Agreement for Non-Employee Directors under the 2022 Stock Incentive Plan for 2025

EXHIBIT 10.9 MKS INSTRUMENTS, INC. Restricted Stock Unit Agreement for Non-Employee Directors Granted Under the 2022 Stock Incentive Plan AGREEMENT «Grant Date» (the “Grant Date”), between MKS Instruments, Inc., a Massachusetts corporation (the “Company”), and «Participant Name» (the “Participant”). For valuable consideration, receipt of which is acknowledged, the parties hereto agree as follows:

February 25, 2025 EX-4.1

Specimen certificate representing the Common Stock

EXHIBIT 4.1 NUMBER FPO COMMON STOCK MKS INSTRUMENTS, INC. INCORPORATED UNDER THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS SHARES SEE REVERSE FOR CERTAIN DEFINITIONS CUSIP 55306N 10 4 THIS CERTIFIES THAT is the owner of FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, NO PAR VALUE, OF MKS INSTRUMENTS, INC. transferable only on the books of the Corporation by the holder hereof in person or by

February 25, 2025 EX-19.1

Insider Trading Policy

EXHIBIT 19.1 MKS Instruments, Inc. Insider Trading Policy (Revised May 16, 2023) 1. Background and purpose 1.1 Overview The federal securities laws prohibit any member of the Company’s Board of Directors (a “Director”) or employee of the Company (or any of its subsidiaries) from purchasing or selling Company securities on the basis of material nonpublic information concerning the Company, or from

February 25, 2025 EX-21.1

Subsidiaries of the Registrant

EXHIBIT 21.1 SUBSIDIARY JURISDICTION OF INCORPORATION Alpha 2 B.V. Netherlands Alpha 3 B.V. Netherlands Alpha 4 B.V. Netherlands Alpha Germany Bidco GmbH Germany Alpha Treasury Services B.V. Netherlands Atotech (China) Chemicals Ltd. China Atotech (Malaysia) Sdn. Bhd. Malaysia Atotech (Philippines) Chemicals, Inc. Philippines Atotech (Singapore) Chemicals Pte. Ltd. Singapore Atotech (Thailand) Co.

February 25, 2025 10-K

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

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 0-23621 MKS INSTRUMENTS,

February 12, 2025 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 12, 2025 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commi

February 12, 2025 EX-99.1

MKS Instruments Reports Fourth Quarter and Full-Year 2024 Financial Results

EXHIBIT 99.1 MKS Instruments Reports Fourth Quarter and Full-Year 2024 Financial Results • Quarterly revenue of $935 million, above the midpoint of guidance • Quarterly GAAP net income of $90 million and net income per diluted share of $1.33 • Quarterly Adjusted EBITDA of $237 million and Non-GAAP net earnings per diluted share of $2.15, above the midpoint of guidance Andover, MA, February 12, 202

January 24, 2025 EX-10.1

Fifth Amendment to Credit Agreement, dated as of January 24, 2025, by and among MKS Instruments, Inc., as parent borrower, the other loan parties party thereto, JPMorgan Chase Bank, N.A., as administrative agent, and each lender party thereto

EX-10.1 2 d908043dex101.htm EX-10.1 Exhibit 10.1 Execution Version FIFTH AMENDMENT TO CREDIT AGREEMENT This FIFTH AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), dated as of January 24, 2025, is entered into by and among MKS INSTRUMENTS, INC., a Massachusetts corporation, as Parent Borrower (the “Parent Borrower”), the other Loan Parties party hereto, JPMORGAN CHASE BANK, N.A. (“JPM”), in its ca

January 24, 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): January 24, 2025 MKS INSTRUMENTS,

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 24, 2025 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commis

January 24, 2025 EX-99.1

MKS Instruments Completes Repricing on its Secured Term Loan B USD and EUR Tranches and Makes a $100 Million Voluntary Prepayment on its Secured Term Loan B USD

Exhibit 99.1 MKS Instruments Completes Repricing on its Secured Term Loan B USD and EUR Tranches and Makes a $100 Million Voluntary Prepayment on its Secured Term Loan B USD Andover, MA, January 24, 2025 - MKS Instruments, Inc. (NASDAQ: MKSI), a global provider of enabling technologies that transform our world, announced today that it successfully completed the repricing of its $2.5 billion and €0

December 3, 2024 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): December 2, 2024 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commis

December 3, 2024 EX-3.1

Second Amended and Restated By-Laws of the Registrant

Exhibit 3.1 SECOND AMENDED AND RESTATED BY-LAWS OF MKS INSTRUMENTS, INC. BY-LAWS Table of Contents Page ARTICLE I STOCKHOLDERS 1 1.1. Annual Meeting 1 1.2. Notice of Business at Annual Meetings 1 1.3. Special Meetings 3 1.4. Place of Meetings 4 1.5. Requirement of Notice 4 1.6. Waiver of Notice 5 1.7. Quorum 5 1.8. Voting and Proxies 5 1.9. Nomination of Directors 5 1.10. Conduct of Meetings 7 1.1

November 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ 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 0-23621 MKS INSTRUMENTS, INC.

November 7, 2024 EX-10.1

Employment Agreement, effective August 9, 2024, between Ramakumar Mayampurath and the Registrant

Exhibit 10.1 EMPLOYMENT AGREEMENT MKS Instruments, Inc., a Massachusetts corporation (the “Company” or “MKS”), and Ram Mayampurath of Chandler, Arizona (“Employee”) agree, effective 9th day of August 2024 as follows: 1. Employment. The Company is employing Employee on an at-will basis in the position of Executive Vice President, Chief Financial Officer (CFO) and Treasurer, beginning October 14, 20

November 6, 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): November 06, 2024 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commi

November 6, 2024 EX-99.1

MKS Instruments Reports Third Quarter 2024 Financial Results

EXHIBIT 99.1 MKS Instruments Reports Third Quarter 2024 Financial Results • Quarterly revenue of $896 million, at the high end of guidance • Quarterly GAAP net income of $62 million and net income per share of $0.92 • Quarterly Adjusted EBITDA of $232 million and Non-GAAP net earnings per diluted share of $1.72, exceeding the high-end of guidance Andover, MA, November 6, 2024 - MKS Instruments, In

November 5, 2024 EX-99.1

MKS Instruments Announces Appointment of Wissam Jabre to its Board of Directors

EX-99.1 Exhibit 99.1 MKS Instruments Announces Appointment of Wissam Jabre to its Board of Directors Andover, Mass., November 5, 2024 – MKS Instruments, Inc. (NASDAQ: MKSI), a global provider of enabling technologies that transform our world, today announced that Wissam Jabre, EVP and Chief Financial Officer of Western Digital Corporation, has been appointed to its Board of Directors, effective No

November 5, 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 4, 2024 MKS INSTRUMENTS,

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, 2024 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commis

August 13, 2024 EX-99.1

Ram Mayampurath to Join MKS Instruments as Chief Financial Officer

Exhibit 99.1 Ram Mayampurath to Join MKS Instruments as Chief Financial Officer Andover, Mass., August 13, 2024 – MKS Instruments, Inc. (NASDAQ: MKSI), a global provider of technologies that transform our world, today announced that Ram Mayampurath has been appointed Executive Vice President, Chief Financial Officer and Treasurer, effective October 14, 2024. He will report directly to John T.C. Le

August 13, 2024 8-K

Regulation FD Disclosure, 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): August 5, 2024 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commissi

August 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ 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 0-23621 MKS INSTRUMENTS, INC.

August 8, 2024 EX-10.1

Employment Agreement, effective April 30, 2024, between John Williams and the Registrant

Exhibit 10.1 EMPLOYMENT AGREEMENT This Employment Agreement is effective 30 day of April 2024, by and between MKS Instruments, Inc., a Massachusetts corporation (“MKS” or the “Company”), and John Williams of Tualatin, Oregon (“Employee”). WHEREAS, the Company and Employee entered into an Employment Agreement effective March 19, 2021 (the “Prior Employment Agreement”); WHEREAS, the Company and Empl

August 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): August 07, 2024 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commiss

August 7, 2024 EX-99.1

MKS Instruments Reports Second Quarter 2024 Financial Results

EXHIBIT 99.1 MKS Instruments Reports Second Quarter 2024 Financial Results • Quarterly revenue of $887 million, at the high end of guidance • Quarterly GAAP net income of $23 million and net income per share of $0.33 • Quarterly Adjusted EBITDA of $228 million and Non-GAAP net earnings per diluted share of $1.53, exceeding the high-end of guidance Andover, MA, August 7, 2024 - MKS Instruments, Inc

July 23, 2024 EX-10.1

Fourth Amendment to Credit Agreement, dated as of July 23, 2024, by and among the Registrant, as parent borrower, the other loan parties party thereto, JPMorgan Chase Bank, N.A., as administrative agent, and each lender party thereto

Exhibit 10.1 Execution Version FOURTH AMENDMENT TO CREDIT AGREEMENT This FOURTH AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), dated as of July 23, 2024, is entered into by and among MKS INSTRUMENTS, INC., a Massachusetts corporation, as Parent Borrower (the “Parent Borrower”), the other Loan Parties party hereto, JPMORGAN CHASE BANK, N.A. (“JPM”), in its capacity as Administrative Agent, and e

July 23, 2024 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement

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 23, 2024 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissio

July 23, 2024 EX-99.1

MKS Instruments Completes Repricing and Makes a $110 Million Voluntary Prepayment on its Secured Term Loan B

Exhibit 99.1 MKS Instruments Completes Repricing and Makes a $110 Million Voluntary Prepayment on its Secured Term Loan B Andover, MA, July 23, 2024 — MKS Instruments, Inc. (NASDAQ: MKSI), a global provider of enabling technologies that transform our world, announced today that it successfully completed the repricing of its $2.6 billion and €0.8 billion secured tranche B term loans maturing in 202

June 20, 2024 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): June 20, 2024 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commissio

May 23, 2024 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT MKS Instruments, Inc. (Exact name of the registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdic

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT MKS Instruments, Inc. (Exact name of the registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation or organization) (Commission File Number) (IRS Employer Identification No.) 2 Tech Drive, Suite 201, Andover, Massachusetts 0181

May 23, 2024 EX-1.01

Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form

Exhibit 1.01 MKS INSTRUMENTS, INC. Conflict Minerals Report For the Year Ended December 31, 2023 Special Note Regarding Forward-Looking Statements This report contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the

May 16, 2024 8-K

Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, 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): May 16, 2024 MKS Instruments, Inc. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

May 16, 2024 EX-4.1

Indenture, dated May 16, 2024, between the Registrant and U.S. Bank Trust Company, National Association, as trustee

Exhibit 4.1 MKS INSTRUMENTS, INC. AND U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee INDENTURE Dated as of May 16, 2024 1.25% Convertible Senior Notes due 2030 TABLE OF CONTENTS PAGE ARTICLE 1 DEFINITIONS Section 1.01. Definitions 1 Section 1.02. References to Interest 13 ARTICLE 2 ISSUE, DESCRIPTION, EXECUTION, REGISTRATION AND EXCHANGE OF NOTES Section 2.01. Designation and Amount 14

May 16, 2024 EX-99.1

MKS Instruments Announces Closing of Private Offering of $1.4 Billion of 1.25% Convertible Senior Notes, Including Full Exercise of Option to Purchase $200 Million of Additional Notes

Exhibit 99.1 MKS Instruments Announces Closing of Private Offering of $1.4 Billion of 1.25% Convertible Senior Notes, Including Full Exercise of Option to Purchase $200 Million of Additional Notes ANDOVER, MA, May 16, 2024 – MKS Instruments, Inc. (NASDAQ: MKSI) (“MKS”) today announced the closing of its offering of $1.4 billion aggregate principal amount of its 1.25% convertible senior notes due 2

May 16, 2024 EX-10.1

Form of Confirmation for Capped Call Transactions

Exhibit 10.1 [Dealer name and address] May [], 2024      To: MKS Instruments, Inc. 2 Tech Drive, Suite 201 Andover, MA 01810 Re: [Base][Additional] Call Option Transaction The purpose of this letter agreement (this “Confirmation”) is to confirm the terms and conditions of the call option transaction entered into between [Dealer] (“Dealer”) and MKS Instruments, Inc. (“Counterparty”) as of the Trade

May 14, 2024 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): May 13, 2024 MKS Instruments, Inc. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

May 14, 2024 EX-99.1

MKS Instruments Announces Pricing of Upsized Private Offering of $1.2 Billion of 1.25% Convertible Senior Notes

Exhibit 99.1 MKS Instruments Announces Pricing of Upsized Private Offering of $1.2 Billion of 1.25% Convertible Senior Notes ANDOVER, MA, May 13, 2024 – MKS Instruments, Inc. (NASDAQ: MKSI) (“MKS”) today announced the pricing of its offering of $1.2 billion aggregate principal amount of 1.25% convertible senior notes due 2030 (the “notes”). The notes will be offered and sold in a private placement

May 13, 2024 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): May 13, 2024 MKS Instruments, Inc. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

May 13, 2024 EX-99.1

MKS Instruments Announces Proposed Private Offering of $1.0 Billion of Convertible Senior Notes

EX-99.1 Exhibit 99.1 MKS Instruments Announces Proposed Private Offering of $1.0 Billion of Convertible Senior Notes ANDOVER, MA, May 13, 2024 – MKS Instruments, Inc. (NASDAQ: MKSI) (“MKS”) today announced that it intends to offer, subject to market and other conditions, $1.0 billion aggregate principal amount of convertible senior notes due 2030 (the “notes”) in a private placement (the “offering

May 9, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ 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 0-23621 MKS INSTRUMENTS, INC.

May 8, 2024 EX-99.1

MKS Instruments Reports First Quarter 2024 Financial Results

EXHIBIT 99.1 MKS Instruments Reports First Quarter 2024 Financial Results • Quarterly revenue of $868 million, above the midpoint of guidance • Quarterly GAAP net income of $15 million and net income per share of $0.22 • Quarterly Adjusted EBITDA of $217 million and Non-GAAP net earnings per diluted share of $1.18, exceeding the high-end of guidance Andover, MA, May 8, 2024 - MKS Instruments, Inc.

May 8, 2024 EX-10.1

Second Amendment, dated May 7, 2024, to Employment Agreement, dated as of September 16, 2019, between James A. Schreiner and the Registrant

Exhibit 10.1 SECOND AMENDMENT TO EMPLOYMENT AGREEMENT This SECOND AMENDMENT (the “Second Amendment”) to the Employment Agreement (as defined below) is made this 7th day of May 2024, by and between MKS Instruments, Inc., a Massachusetts corporation (“MKS”), and James A. Schreiner (“Employee”). WHEREAS, MKS and Employee are parties to an employment agreement dated September 16, 2019 (the “Employment

May 8, 2024 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): May 7, 2024 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

May 8, 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 08, 2024 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commission

April 1, 2024 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): April 1, 2024 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commissio

March 27, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amend

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 27, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amend

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

February 27, 2024 EX-10.9

Form of Restricted Stock Unit Agreement for Employees under the 2022 Stock Incentive Plan for 2024 (Standard)

EXHIBIT 10.9 MKS INSTRUMENTS, INC. Restricted Stock Unit Agreement Granted Under the 2022 Stock Incentive Plan AGREEMENT made (the “Grant Date”), between MKS Instruments, Inc., a Massachusetts corporation (the “Company”), and (the “Participant”). For valuable consideration, receipt of which is acknowledged, the parties hereto agree as follows: 1. General. The Company hereby grants to the Participa

February 27, 2024 EX-97.1

Dodd-Frank Compensation Recovery Policy

EXHIBIT 97.1 MKS INSTRUMENTS, INC. Dodd-Frank Compensation Recovery Policy This Compensation Recovery Policy (this “Policy”) is adopted by MKS Instruments, Inc. (the “Company”) in accordance with Nasdaq Listing Rule 5608 (“Rule 5608”), which implements Rule 10D-1 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) (as promulgated pursuant to Section 954 of the Dodd-Frank Wal

February 27, 2024 EX-10.10

Form of Restricted Stock Unit Agreement for Employees under the 2022 Stock Incentive Plan for 2024 (rTSR)

EXHIBIT 10.10 MKS INSTRUMENTS, INC. Restricted Stock Unit Agreement Granted Under the 2022 Stock Incentive Plan AGREEMENT made (the “Grant Date”), between MKS Instruments, Inc., a Massachusetts corporation (the “Company”), and (the “Participant”). For valuable consideration, receipt of which is acknowledged, the parties hereto agree as follows: 1. General. The Company hereby grants to the Particip

February 27, 2024 EX-21.1

Subsidiaries of the Registrant

EXHIBIT 21.1 SUBSIDIARIES OF THE REGISTRANT SUBSIDIARY JURISDICTION OF INCORPORATION Alpha 2 B.V. Netherlands Alpha 3 B.V. Netherlands Alpha 4 B.V. Netherlands Alpha Germany Bidco GmbH Germany Alpha Treasury Services B.V. Netherlands Atotech (China) Chemicals Ltd. China Atotech (Malaysia) Sdn. Bhd. Malaysia Atotech (Philippines) Chemicals, Inc. Philippines Atotech (Singapore) Chemicals Pte. Ltd. S

February 27, 2024 10-K

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

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 0-23621 MKS INSTRUMENTS,

February 21, 2024 POS AM

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO: FORM S-3 REGISTRATION STATEMENT NO. 333-267046 THE SECURITIES ACT OF 1933 MKS Instruments, Inc. (Exact name of registrant as specified in its c

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO: FORM S-3 REGISTRATION STATEMENT NO. 333-267046 UNDER THE SECURITIES ACT OF 1933 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts (State or other jurisdiction of incorporation or organization) 04-2277512 (I.R.S. Employer Identification Number) 2 Tech D

February 14, 2024 EX-10.1

Third Amendment to Credit Agreement, dated as of February 13, 2024, by and among the Registrant, as parent borrower, the other loan parties party thereto, JPMorgan Chase Bank, N.A., as administrative agent, and each lender and letter of credit issuer party thereto

Exhibit 10.1 Execution Version THIRD AMENDMENT TO CREDIT AGREEMENT This THIRD AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), dated as of February 13, 2024, is entered into by and among MKS INSTRUMENTS, INC., a Massachusetts corporation, as Parent Borrower (the “Parent Borrower”), the other Loan Parties party hereto, JPMORGAN CHASE BANK, N.A. (“JPM”), in its capacity as Administrative Agent, eac

February 14, 2024 8-K

Entry into a Material Definitive Agreement

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 13, 2024 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commi

February 13, 2024 SC 13G/A

MKSI / MKS Instruments, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 14)* Name of issuer: MKS Instruments Inc Title of Class of Securities: Common Stock CUSIP Number: 55306N104 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

February 12, 2024 SC 13G/A

MKSI / MKS Instruments, Inc. / Carlyle Group Inc. - SC 13G/A Passive Investment

SC 13G/A 1 d792127dsc13ga.htm SC 13G/A Securities and Exchange Commission Washington, D.C. 20549 Schedule 13G (Rule 13d-102) 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 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1)* MKS Instruments, Inc. (Name of Issuer) Common Stock, no par value (Title o

February 12, 2024 EX-24

POWER OF ATTORNEY

EX-24 2 d792127dex24.htm EX-24 Exhibit 24 POWER OF ATTORNEY The undersigned understands that, from time to time, the Carlyle Companies (defined below) are required to prepare, execute, and file certain federal and state securities laws filings. Know all by these presents, that the undersigned hereby constitutes and appoints each of Jeffrey Ferguson, Jeremy Anderson, Chintan Bhatt, Anne Frederick,

February 9, 2024 SC 13G/A

MKSI / MKS Instruments, Inc. / Capital International Investors - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5 )* MKS Instruments, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 55306N104 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box

February 8, 2024 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): February 5, 2024 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commis

February 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): February 07, 2024 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commi

February 7, 2024 SC 13G/A

MKSI / MKS Instruments, Inc. / VICTORY CAPITAL MANAGEMENT INC Passive Investment

SC 13G/A 1 mksinstruments13ga1123123.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 ( Amendment No. )* MKS Instruments (Name of Issuer) Common Stock (Title of Class of Securities) 55306N104 (CUSIP Number) December 31, 2023 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designat

February 7, 2024 EX-99.1

MKS Instruments Reports Fourth Quarter and Full-Year 2023 Financial Results

EXHIBIT 99.1 MKS Instruments Reports Fourth Quarter and Full-Year 2023 Financial Results • Quarterly revenue of $893 million, exceeding the high-end of guidance • Quarterly GAAP net loss of $68 million and net loss per share of $1.02, which includes goodwill and intangible asset impairments • Quarterly Non-GAAP net earnings per diluted share of $1.17 and Adjusted EBITDA of $218 million, exceeding

January 22, 2024 EX-99.1

MKS Instruments Completes Refinancing of Secured Term Loan A

Exhibit 99.1 MKS Instruments Completes Refinancing of Secured Term Loan A Andover, MA, January 22, 2024 — MKS Instruments, Inc. (NASDAQ: MKSI) (“MKS”), a global provider of enabling technologies that transform our world, announced today that it successfully completed the refinancing of its existing $744 million secured tranche A term loans using a portion of the proceeds of its $490 million increm

January 22, 2024 EX-10.1

Second Amendment to Credit Agreement, dated as of January 22, 2024, by and among the Registrant, as parent borrower, the other loan parties party thereto, JPMorgan Chase Bank, N.A., as administrative agent, and each lender party thereto

Exhibit 10.1 EXECUTION VERSION SECOND AMENDMENT TO CREDIT AGREEMENT This SECOND AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), dated as of January 22, 2024, is entered into by and among MKS INSTRUMENTS, INC., a Massachusetts corporation, as Parent Borrower (the “Parent Borrower”), the other Loan Parties party hereto, JPMORGAN CHASE BANK, N.A. (“JPM”), in its capacity as Administrative Agent, an

January 22, 2024 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits, 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): January 22, 2024 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commis

December 4, 2023 EX-99.1

Seth H. Bagshaw to Retire as Chief Financial Officer of MKS Instruments Retirement in April 2024 caps 18-year career in helping build MKS

Exhibit 99.1 Seth H. Bagshaw to Retire as Chief Financial Officer of MKS Instruments Retirement in April 2024 caps 18-year career in helping build MKS ANDOVER, Mass., Dec. 4, 2023 (GLOBE NEWSWIRE) — MKS Instruments, Inc. (NASDAQ: MKSI), a global provider of enabling technologies that transform our world, today announced that Seth H. Bagshaw, 64, will retire as Executive Vice President, Chief Finan

December 4, 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): December 1, 2023 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commis

November 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ 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 0-23621 MKS INSTRUMENTS, INC.

November 1, 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): November 01, 2023 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commi

November 1, 2023 EX-99.1

MKS Instruments Reports Third Quarter 2023 Financial Results

EXHIBIT 99.1 MKS Instruments Reports Third Quarter 2023 Financial Results • Revenue of $932 million, in-line with the midpoint of guidance • GAAP gross margin of 45.7% and Non-GAAP gross margin of 47.1%, above the high-end of guidance • GAAP operating margin of 12.6% and Non-GAAP operating margin of 21.8%, above the high-end of guidance • GAAP net income per diluted share of $0.58 and Non-GAAP net

October 3, 2023 EX-10.1

First Amendment to Credit Agreement, dated as of October 3, 2023, by and among the Registrant, as parent borrower, the other loan parties party thereto, JPMorgan Chase Bank, N.A., as administrative agent, and each lender party thereto

Exhibit 10.1 Execution Version FIRST AMENDMENT TO CREDIT AGREEMENT This FIRST AMENDMENT TO CREDIT AGREEMENT (this “Amendment”), dated as of October 3, 2023, is entered into by and among MKS INSTRUMENTS, INC., a Massachusetts corporation, as Parent Borrower (the “Parent Borrower”), the other Loan Parties party hereto, JPMORGAN CHASE BANK, N.A. (“JPM”), in its capacity as Administrative Agent, and e

October 3, 2023 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement

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, 2023 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commiss

October 3, 2023 EX-99.1

MKS Instruments Completes Repricing of Secured Term Loan B

Exhibit 99.1 MKS Instruments Completes Repricing of Secured Term Loan B Andover, MA, October 3, 2023 — MKS Instruments, Inc. (NASDAQ: MKSI), a global provider of enabling technologies that transform our world, announced today that it successfully completed the repricing of its existing $3.6 billion secured tranche B term loan. The lenders have agreed to an amendment that results in a reduction of

August 4, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ 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 0-23621 MKS INSTRUMENTS, INC.

August 2, 2023 EX-99.1

MKS Instruments Reports Second Quarter 2023 Financial Results

EXHIBIT 99.1 MKS Instruments Reports Second Quarter 2023 Financial Results • Revenue of $1.0 billion, up 26% sequentially and above the midpoint of guidance • Semiconductor market revenue of $440 million, up 42% sequentially and above high end of guidance • Gross margin of 46.9%, above high end of guidance • GAAP net loss per share of $26.47, which includes goodwill and intangible asset impairment

August 2, 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): August 02, 2023 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commiss

June 9, 2023 SC 13G/A

MKSI / MKS Instruments, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 13)* Name of issuer: MKS Instruments Inc. Title of Class of Securities: Common Stock CUSIP Number: 55306N104 Date of Event Which Requires Filing of this Statement: May 31, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Ru

June 5, 2023 EX-99.1

MKS Instruments Announces Pricing of Public Offering by Selling Stockholders

EX-99.1 Exhibit 99.1 MKS Instruments Announces Pricing of Public Offering by Selling Stockholders Andover, MA, June 1, 2023 — MKS Instruments, Inc. (NASDAQ: MKSI) (“MKS”), a global provider of enabling technologies that transform our world, announced today the pricing of an underwritten public offering of 2,000,000 shares of common stock by entities affiliated with Carlyle. The offering is expecte

June 5, 2023 EX-1.1

Underwriting Agreement, dated June 1, 2023, by and among MKS Instruments, Inc., J.P. Morgan Securities LLC, as underwriter, and the selling stockholders named therein.

EX-1.1 Exhibit 1.1 Execution Version MKS INSTRUMENTS, INC. 2,000,000 Shares of Common Stock Underwriting Agreement June 1, 2023 J.P. Morgan Securities LLC 383 Madison Avenue New York, New York 10179 Ladies and Gentlemen: The selling stockholders named in Schedule 2 hereto (the “Selling Stockholders”), each a stockholder of MKS Instruments, Inc., a Massachusetts corporation (the “Company”), propose

June 5, 2023 424B7

2,000,000 Shares Common Stock

424B7 Table of Contents Filed Pursuant to Rule 424(b)(7) Registration No. 333-267046 Preliminary Prospectus Supplement (to Prospectus dated August 24, 2022) 2,000,000 Shares Common Stock The selling stockholders identified in this prospectus supplement are selling 2,000,000 shares of our common stock. We are not selling any securities under this prospectus supplement and will not receive any of th

June 5, 2023 8-K

Entry into a Material Definitive Agreement, 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): June 1, 2023 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

June 1, 2023 424B7

Subject to Completion, dated June 1, 2023

424B7 Table of Contents Filed Pursuant to Rule 424(b)(7) Registration No. 333-267046 The information in this preliminary prospectus supplement is not complete and may be changed. A registration statement relating to these securities has been filed with the Securities and Exchange Commission and is effective. This preliminary prospectus supplement and the accompanying prospectus are not an offer to

May 25, 2023 EX-1.01

MKS INSTRUMENTS, INC. Conflict Minerals Report For the Year Ended December 31, 2022

EX-1.01 2 d503511dex101.htm EX-1.01 Exhibit 1.01 MKS INSTRUMENTS, INC. Conflict Minerals Report For the Year Ended December 31, 2022 Special Note Regarding Forward-Looking Statements This report contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Ex

May 25, 2023 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT MKS Instruments, Inc. (Exact name of the registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdic

SD UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT MKS Instruments, Inc. (Exact name of the registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation or organization) (Commission File Number) (IRS Employer Identification No.) 2 Tech Drive, Suite 201, Andover, Massachusetts 0

May 18, 2023 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): May 16, 2023 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

May 5, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ 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 0-23621 MKS INSTRUMENTS, INC.

May 3, 2023 EX-99

MKS Instruments Reports First Quarter 2023 Financial Results

EXHIBIT 99.1 MKS Instruments Reports First Quarter 2023 Financial Results • Global operations restored following ransomware incident • Revenue of $794 million • GAAP net loss per diluted share of $0.64 • Non-GAAP net earnings per diluted share of $0.48 • Operating cash flow of $37 million and free cash flow of $20 million Andover, MA, May 3, 2023 - MKS Instruments, Inc. (NASDAQ: MKSI), a global pr

May 3, 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

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 03, 2023 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commission

April 5, 2023 DEF 14A

definitive proxy statement

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

April 5, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amend

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 14, 2023 EX-10

Form of Restricted Stock Unit Agreement for Employees under the 2022 Stock Incentive Plan for 2023

Exhibit 10.5 MKS INSTRUMENTS, INC. Restricted Stock Unit Agreement Granted Under the 2022 Stock Incentive Plan AGREEMENT made (the “Grant Date”), between MKS Instruments, Inc., a Massachusetts corporation (the “Company”), and (the “Participant”). For valuable consideration, receipt of which is acknowledged, the parties hereto agree as follows: 1. General. The Company hereby grants to the Participa

March 14, 2023 EX-21

Subsidiaries of the Registrant

EXHIBIT 21.1 SUBSIDIARIES OF THE REGISTRANT SUBSIDIARY JURISDICTION OF INCORPORATION Alpha 2 B.V. Netherlands Alpha 3 B.V. Netherlands Alpha 4 B.V. Netherlands Alpha 5 B.V. Netherlands Alpha Germany Bidco GmbH Germany Atotech (China) Chemicals Ltd. China Atotech (Malaysia) Sdn. Bhd. Malaysia Atotech (Philippines) Chemicals, Inc. Philippines Atotech (Singapore) Chemicals Pte. Ltd. Singapore Atotech

March 14, 2023 10-K

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

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 0-23621 MKS INSTRUMENTS,

February 27, 2023 EX-99

MKS Instruments Reports Fourth Quarter And Full-Year 2022 Financial Results

EXHIBIT 99.1 MKS Instruments Reports Fourth Quarter And Full-Year 2022 Financial Results • Record quarterly revenue of $1.09 billion, up 42% year-over-year, exceeding the high-end of guidance • Quarterly GAAP net income per diluted share of $0.81 and quarterly Non-GAAP net earnings per diluted share of $2.00, exceeding the high-end of guidance • Quarterly GAAP net income of $54 million and quarter

February 27, 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

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 27, 2023 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commi

February 27, 2023 NT 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 12b-25 NOTIFICATION OF LATE FILING

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 12b-25 NOTIFICATION OF LATE FILING SEC File Number: 000-23621 CUSIP Number: 55306N104 (Check one): ☒ Form 10-K ☐ Form 20-F ☐ Form 11-K ☐ Form 10-Q ☐ Form 10-D ☐ Form N-SAR ☐ Form N-CSR For Period Ended: December 31, 2022 ☐ Transition Report on Form 10-K ☐ Transition Report on Form 20-F ☐ Transition Report on Form 11-K ☐ T

February 13, 2023 EX-99.1

MKS Reschedules Fourth Quarter and Full Year 2022 Earnings Call to February 28, 2023

Exhibit 99.1 MKS Reschedules Fourth Quarter and Full Year 2022 Earnings Call to February 28, 2023 Andover, Mass., February 13, 2023 — MKS Instruments, Inc. (NASDAQ: MKSI), a global provider of enabling technologies that transform our world, today reported that due to the ransomware event that was identified on February 3, 2023, the Company now plans to release fourth quarter and full year 2022 fin

February 13, 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): February 13, 2023 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commi

February 10, 2023 SC 13G/A

MKSI / MKS Instruments, Inc. / Capital International Investors - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3 )* MKS Instruments, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 55306N104 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box

February 10, 2023 SC 13G/A

MKSI / MKS Instruments, Inc. / Capital International Investors - 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 )* MKS Instruments, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 55306N104 (CUSIP Number) January 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this S

February 9, 2023 SC 13G/A

MKSI / MKS Instruments, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01436-mksinstrumentsinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 12)* Name of issuer: MKS Instruments Inc. Title of Class of Securities: Common Stock CUSIP Number: 55306N104 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to desi

February 6, 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 3, 2023 MKS Instruments,

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 3, 2023 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commis

February 6, 2023 SC 13G/A

MKSI / MKS Instruments, Inc. / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3 )* MKS INSTRUMENTS INC (Name of Issuer) Common Stock (Title of Class of Securities) 55306N104 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to

February 2, 2023 SC 13G

MKSI / MKS Instruments, Inc. / VICTORY CAPITAL MANAGEMENT INC Passive Investment

SC 13G 1 mksinstruments13g123122.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 ( Amendment No. )* MKS Instruments (Name of Issuer) Common Stock (Title of Class of Securities) 55306N104 (CUSIP Number) December 31, 2022 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate th

December 13, 2022 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): December 13, 2022 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commi

November 7, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 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 0-23621 MKS INSTRUMENTS, INC.

November 2, 2022 EX-99.1

MKS Instruments Reports Third Quarter 2022 Financial Results

EXHIBIT 99.1 MKS Instruments Reports Third Quarter 2022 Financial Results ? Record quarterly revenue of $954 million ? Non-GAAP net earnings per diluted share of $2.74 and GAAP net income per diluted share of $0.09 ? Successfully completed acquisition of Atotech Limited, adding critical chemistry solutions for advanced electronics and specialty industrial markets to MKS' portfolio Andover, MA, Nov

November 2, 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): November 02, 2022 MKS INSTRUMENTS, INC. (Exact name of Registrant as Specified in Its Charter) Massachusetts 000-23621 04-2277512 (State or Other Jurisdiction of Incorporation) (Commi

August 31, 2022 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): August 31, 2022 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commiss

August 29, 2022 EX-24

POWER OF ATTORNEY

Exhibit 24 POWER OF ATTORNEY The undersigned understands that, from time to time, the Carlyle Companies (defined below) are required to prepare, execute, and file certain federal and state securities laws filings.

August 29, 2022 EX-99

JOINT FILING AGREEMENT

Exhibit 99 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that they are jointly filing this statement on Schedule 13G.

August 29, 2022 SC 13G

MKSI / MKS Instruments, Inc. / Carlyle Group Inc. - SC 13G Passive Investment

Securities and Exchange Commission Washington, D.C. 20549 Schedule 13G (Rule 13d-102) 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 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. )* MKS Instruments, Inc. (Name of Issuer) Common Stock, no par value (Title of Class of Securities) 55306N104 (CUSIP

August 24, 2022 EX-99.3

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Exhibit 99.3 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION The unaudited pro forma condensed combined financial information (?Unaudited Pro Forma Financial Information?) included herein presents the unaudited pro forma condensed combined balance sheet (?Unaudited Pro Forma Balance Sheet?) and the unaudited pro forma condensed combined statements of operations (?Unaudited Pro Forma S

August 24, 2022 8-K/A

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) 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 17, 2022 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of inc

August 24, 2022 EX-FILING FEES

Filing Fee Table

EX-FILING FEES Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) MKS INSTRUMENTS, INC.

August 24, 2022 S-3ASR

As filed with the Securities and Exchange Commission on August 24, 2022

Table of Contents As filed with the Securities and Exchange Commission on August 24, 2022 Registration No.

August 17, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Completion of Acquisition or Disposition of Assets, 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 17, 2022 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commiss

August 17, 2022 8-K/A

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/A (Amendment No. 1) 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 25, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of in

August 17, 2022 EX-10.3

Credit Agreement, dated as of August 17, 2022, by and among the Registrant, the lenders and letter of credit issuers party thereto and JPMorgan Chase Bank, N.A., as administrative agent and collateral agent

Exhibit 10.3 Execution Version CREDIT AGREEMENT DATED AS OF AUGUST 17, 2022 AMONG MKS INSTRUMENTS, INC., AS PARENT BORROWER, JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT, COLLATERAL AGENT AND A L/C ISSUER, THE OTHER LENDERS AND L/C ISSUERS PARTY HERETO, JPMORGAN CHASE BANK, N.A., BARCLAYS BANK PLC, BOFA SECURITIES, INC., CITIBANK, N.A., HSBC SECURITIES (USA) INC. AND MIZUHO BANK, LTD., AS JO

August 17, 2022 EX-99.1

SUMMARY OF RISK FACTORS

Exhibit 99.1 SUMMARY OF RISK FACTORS Below is a summary of the principal factors that make an investment in MKS speculative or risky. The following summary does not contain all of the information that may be important to you, and you should read the below summary in conjunction with the more detailed discussion of risks set forth under the heading ?Risk Factors? that follows. Acquisition Risks ? O

August 17, 2022 EX-10.1

Investor Rights Agreement, dated August 17, 2022, by and among MKS Instruments, Inc. and the Carlyle Stockholders

Exhibit 10.1 INVESTOR RIGHTS AGREEMENT BY AND AMONG MKS INSTRUMENTS, INC. AND THE CARLYLE STOCKHOLDERS AUGUST 17, 2022 TABLE OF CONTENTS Page SECTION I. DEFINITIONS 1 1.1 Drafting Conventions; No Construction Against Drafter 1 1.2 Defined Terms 2 SECTION II. REPRESENTATIONS AND WARRANTIES OF THE COMPANY 3 2.1 Representations and Warranties of the Company 3 SECTION III. REGISTRATION RIGHTS 4 3.1 De

August 3, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 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 0-23621 MKS INSTRUMENTS, INC.

July 28, 2022 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): July 28, 2022 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissio

July 27, 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): July 27, 2022 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissio

July 27, 2022 EX-99.1

MKS Instruments Reports Second Quarter 2022 Financial Results

EXHIBIT 99.1 MKS Instruments Reports Second Quarter 2022 Financial Results ? Record revenue of $765 million, up 3% sequentially and above high-end of guidance ? Record Semiconductor Market revenue of $515 million, up 6% sequentially and 19% year-over-year ? Non-GAAP net earnings per diluted share of $2.59, above high-end of guidance, and GAAP net income per diluted share of $2.32 Andover, MA, July

May 26, 2022 EX-1.01

Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form

Exhibit 1.01 MKS INSTRUMENTS, INC. Conflict Minerals Report For the Year Ended December 31, 2021 Special Note Regarding Forward-Looking Statements This report contains ?forward-looking statements? within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (Exch

May 26, 2022 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT MKS Instruments, Inc. (Exact name of the registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdic

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT MKS Instruments, Inc. (Exact name of the registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation or organization) (Commission File Number) (IRS Employer Identification No.) 2 Tech Drive, Suite 201, Andover, Massachusetts 0181

May 11, 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, 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): May 10, 2022 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

May 11, 2022 EX-10.3

Form of Restricted Stock Unit Agreement for Employees under the 2022 Stock Incentive Plan for 2022

Exhibit 10.3 MKS INSTRUMENTS, INC. Restricted Stock Unit Agreement Granted Under the 2022 Stock Incentive Plan AGREEMENT made ?Grant Date? (the ?Grant Date?), between MKS Instruments, Inc., a Massachusetts corporation (the ?Company?), and ?Participant Name? (the ?Participant?). For valuable consideration, receipt of which is acknowledged, the parties hereto agree as follows: 1. General. The Compan

May 11, 2022 EX-10.2

Form of Restricted Stock Unit Agreement for Non-Employee Directors under the 2022 Stock Incentive Plan

Exhibit 10.2 MKS INSTRUMENTS, INC. Restricted Stock Unit Agreement Annual Grant to Non-Employee Directors Under the 2022 Stock Incentive Plan AGREEMENT ?Grant Date? (the ?Grant Date?), between MKS Instruments, Inc., a Massachusetts corporation (the ?Company?), and ?Participant Name? (the ?Participant?). For valuable consideration, receipt of which is acknowledged, the parties hereto agree as follo

May 10, 2022 EX-99.1

2022 Stock Incentive Plan

Exhibit 99.1 MKS Instruments, Inc. 2022 STOCK INCENTIVE PLAN 1. Purpose The purpose of this 2022 Stock Incentive Plan (the ?Plan?) of MKS Instruments, Inc., a Massachusetts corporation (the ?Company?), is to advance the interests of the Company?s stockholders by enhancing the Company?s ability to attract, retain and motivate persons who are expected to make important contributions to the Company a

May 10, 2022 S-8

As filed with the Securities and Exchange Commission on May 10, 2022

As filed with the Securities and Exchange Commission on May 10, 2022 Registration No.

May 10, 2022 EX-FILING FEES

Calculation of Filing Fee Tables

Exhibit 107 Calculation of Filing Fee Tables Form S-8 (Form Type) MKS INSTRUMENTS, INC.

May 2, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 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 0-23621 MKS INSTRUMENTS, INC.

April 26, 2022 EX-99.1

MKS Instruments Reports First Quarter 2022 Financial Results

EXHIBIT 99.1 MKS Instruments Reports First Quarter 2022 Financial Results ? Revenue of $742 million, up 7% year-over-year ? GAAP net income of $143 million, up 17% year-over-year ? Non-GAAP net earnings of $151 million, up 6% year-over-year ? Has become the market share leader in RF Power Supplies ? Successful re-syndication of Atotech Limited acquisition financing Andover, MA, April 26, 2022 ? MK

April 26, 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): April 26, 2022 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissi

April 5, 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): April 5, 2022 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissio

April 5, 2022 EX-99.1

SAFE HARBOR FOR FORWARD-LOOKING STATEMENTS This presentation contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933 and Section 21E of the Securities E

Exhibit 99.1 Lender Presentation April 2022 MKS Instruments,Inc. SAFE HARBOR FOR FORWARD-LOOKING STATEMENTS This presentation contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 regarding the proposed acquisition (the ?Acquisition?) by MKS Ins

April 1, 2022 EX-2.1

Amendment to Implementation Agreement, dated April 1, 2022, by and among Atotech Limited, MKS Instruments, Inc. and Atotech Manufacturing, Inc.

Exhibit 2.1 EXECUTION VERSION AMENDMENT TO THE IMPLEMENTATION AGREEMENT DATED 1 JULY 2021 AMONG ATOTECH LIMITED, MKS INSTRUMENTS, INC. AND ATOTECH MANUFACTURING, INC. THIS AMENDMENT (this ?Amendment?) to the Implementation Agreement (as defined below) is made as of 1 April 2022, by and among Atotech Limited (the ?Company?), MKS Instruments, Inc. (the ?Acquirer?) and Atotech Manufacturing, Inc., an

April 1, 2022 EX-10.1

Commitment Letter, by and among MKS Instruments, Inc., JPMorgan Chase Bank, N.A. and Barclays Bank PLC, dated as of April 1, 2022

Exhibit 10.1 Execution Version JPMORGAN CHASE BANK, N.A. 383 Madison Avenue New York, New York 10179 BARCLAYS 745 Seventh Avenue New York, New York 10019 PERSONAL AND CONFIDENTIAL April 1, 2022 MKS Instruments, Inc. 2 Tech Drive, Suite 201 Andover, Massachusetts 01810 Attention: Seth H. Bagshaw, Senior Vice President, Chief Financial Officer & Treasurer Commitment Letter Ladies and Gentlemen: You

April 1, 2022 EX-99.1

MKS Instruments Provides Update on Pending Acquisition of Atotech

Exhibit 99.1 MKS Instruments Provides Update on Pending Acquisition of Atotech ANDOVER, Mass., April 1, 2022 ? (GLOBE NEWSWIRE) ? MKS Instruments, Inc. (NASDAQ: MKSI) (?MKS?), a global provider of technologies that enable advanced processes and improve productivity, today announced that it has agreed with Atotech Limited (NYSE: ATC) (?Atotech?) to extend the date for completing MKS? previously ann

April 1, 2022 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, 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): April 1, 2022 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissio

March 31, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amend

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 31, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amend

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

February 28, 2022 EX-21.1

Subsidiaries of the Registrant

EXHIBIT 21.1 SUBSIDIARIES OF THE REGISTRANT SUBSIDIARY JURISDICTION OF INCORPORATION Atotech Manufacturing, Inc. Delaware Beijing Newport Spectra-Physics Technologies Co., Ltd. China Electro Scientific Industries Europe Ltd United Kingdom Electro Scientific Industries GmbH Germany Electro Scientific Industries Singapore Pte. Ltd. Singapore Electro Scientific Industries, Inc. Oregon ESI China, Inc.

February 28, 2022 EX-2.2

Letter Agreement, by and among the Registrant, Atotech Limited and Atotech Manufacturing, Inc., dated October 29, 2021

Exhibit 2.2 LETTER AGREEMENT THIS AGREEMENT (the ?Agreement?) is made on 29 October, 2021. WHEREAS: (A) The following parties entered into an Implementation Agreement on 1 July, 2021 (the ?Implementation Agreement?): 1) ATOTECH LIMITED, a registered public company incorporated and existing under the laws of Jersey with registered number 127906 and whose registered office is at 3rd Floor, 44 Esplan

February 28, 2022 10-K

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

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, 2021 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 0-23621 MKS INSTRUMENTS,

February 11, 2022 SC 13G/A

MKSI / MKS Instruments, Inc. / Capital International Investors - 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. 2 )* MKS Instruments, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 55306N104 (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 this

February 11, 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

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 7, 2022 MKS INSTRUMENTS, INC. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commis

February 11, 2022 EX-10.1

Management Incentive Plan

Exhibit 10.1 MKS INSTRUMENTS, INC. MANAGEMENT INCENTIVE PLAN ARTICLE 1. DURATION AND PURPOSE 1.1 Duration. The Plan is effective as of January 1, 2022 and will remain in effect until terminated by the Company (as defined below) pursuant to Section 6.4 below. 1.2 Purpose. The Plan is intended to increase shareholder value and the success of the Company by providing a cash incentive to selected empl

February 10, 2022 SC 13G/A

MKSI / MKS Instruments, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: MKS Instruments Inc. Title of Class of Securities: Common Stock CUSIP Number: 55306N104 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

February 4, 2022 SC 13G/A

MKSI / MKS Instruments, 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. 2 )* MKS INSTRUMENTS INC (Name of Issuer) Common Stock (Title of Class of Securities) 55306N104 (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 this Sc

January 26, 2022 EX-99.1

MKS Instruments Reports Fourth Quarter And Full Year 2021 Financial Results

EXHIBIT 99.1 MKS Instruments Reports Fourth Quarter And Full Year 2021 Financial Results ? Record quarterly revenue of $764 million, up 16% year-over-year ? Record quarterly Non-GAAP net earnings of $168 million, up 29% year-over-year, and quarterly GAAP net income of $150 million, up 30% year-over-year ? Record annual revenue of $2.9 billion, up 27% year-over-year ? Record annual Non-GAAP net ear

January 26, 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): January 26, 2022 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commis

December 14, 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 14, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commi

December 14, 2021 EX-99.1

MKS Instruments and Atotech Provide Update on Pending Acquisition of Atotech

Exhibit 99.1 MKS Instruments and Atotech Provide Update on Pending Acquisition of Atotech ANDOVER, Mass. and LONDON, England ? December 14, 2021 ? (GLOBE NEWSWIRE) ? MKS Instruments, Inc. (NASDAQ: MKSI) (?MKS?), a global provider of technologies that enable advanced processes and improve productivity, and Atotech Limited (NYSE: ATC) (?Atotech?), a leading process chemicals technology and advanced

November 3, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 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 0-23621 MKS INSTRUMENTS, INC.

October 29, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, 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 25, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commis

October 29, 2021 EX-10.2

Amendment, dated October 25, 2021, to Employment Agreement, effective September 16, 2019, between James A. Schreiner and the Registrant

Exhibit 10.2 AMENDMENT TO EMPLOYMENT AGREEMENT This AMENDMENT (the ?Amendment?) to the Employment Agreement (as defined below) is made this 25th day of October 2021, by and between MKS Instruments, Inc., a Massachusetts Corporation (?MKS?), and James A. Schreiner (?Employee?). WHEREAS, MKS and Employee are parties to an employment agreement dated September 16, 2019 (the ?Employment Agreement?); an

October 29, 2021 EX-10.1

Letter Agreement, by and among the Registrant, Atotech Limited and Atotech Manufacturing, Inc., dated October 29, 2021

Exhibit 10.1 LETTER AGREEMENT THIS AGREEMENT (the ?Agreement?) is made on 29 October, 2021. WHEREAS: (A) The following parties entered into an Implementation Agreement on 1 July, 2021 (the ?Implementation Agreement?): 1) ATOTECH LIMITED, a registered public company incorporated and existing under the laws of Jersey with registered number 127906 and whose registered office is at 3rd Floor, 44 Espla

October 27, 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): October 27, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commis

October 27, 2021 EX-99.1

MKS Instruments Reports Third Quarter 2021 Financial Results

EXHIBIT 99.1 MKS Instruments Reports Third Quarter 2021 Financial Results ? Revenue of $742 million, up 26% year-over-year ? Non-GAAP net earnings of $155 million, up 45% year-over-year, and GAAP net income of $132 million, up 44% year-over-year ? Operating cash flow of $153 million, up 1% year-over-year, and free cash flow of $133 million, up 8% year-over-year Andover, MA, October 27, 2021 ? MKS

October 4, 2021 EX-99.1

SAFE HARBOR FOR FORWARD-LOOKING STATEMENTS This presentation contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933 and Section 21E of the Securities E

EX-99.1 2 d149074dex991.htm EX-99.1 Exhibit 99.1 Public Lender Presentation October 6, 2021 MKS Instruments, Inc. SAFE HARBOR FOR FORWARD-LOOKING STATEMENTS This presentation contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 regarding the pr

October 4, 2021 8-K

Regulation FD Disclosure, 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): October 4, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commiss

August 5, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 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 0-23621 MKS INSTRUMENTS, INC.

July 28, 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): July 28, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissio

July 28, 2021 EX-99.1

MKS Instruments Reports Second Quarter 2021 Financial Results

EX-99.1 2 d202582dex991.htm EX-99.1 EXHIBIT 99.1 MKS Instruments Reports Second Quarter 2021 Financial Results • Record revenue of $750 million, up 38% year-over-year • Record Non-GAAP net earnings of $168 million, up 88% year-over-year, and GAAP net income of $147 million, up 99% year-over-year • Record operating cash flow of $165 million, up 19% year-over-year, and record free cash flow of $149

July 15, 2021 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): July 15, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissio

July 8, 2021 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): July 8, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

July 8, 2021 EX-99.1

Safe Harbor for Forward-Looking Statements Statements in this presentation regarding the proposed transaction (the “transaction”) between MKS Instruments, Inc. (“MKS”) and Atotech Limited (“Atotech”), the expected timetable for completing the transac

EX-99.1 2 d184441dex991.htm EX-99.1 Optimizing the Interconnect: The Next Frontier For Miniaturization & Complexity MKS To Acquire Atotech July 1, 2021 (updated July 8, 2021) Exhibit 99.1 Safe Harbor for Forward-Looking Statements Statements in this presentation regarding the proposed transaction (the “transaction”) between MKS Instruments, Inc. (“MKS”) and Atotech Limited (“Atotech”), the expecte

July 2, 2021 EX-10.2

Commitment Letter, by and among the Company, JPMorgan Chase Bank, N.A. and Barclays Bank PLC, dated as of July 1, 2021

EX-10.2 4 d174752dex102.htm EX-10.2 Exhibit 10.2 Execution Version JPMORGAN CHASE BANK, N.A. 383 Madison Avenue New York, New York 10179 BARCLAYS 745 Seventh Avenue New York, New York 10019 PERSONAL AND CONFIDENTIAL July 1, 2021 MKS Instruments, Inc. 2 Tech Drive, Suite 201 Andover, Massachusetts 01810 Attention: Seth H. Bagshaw, Senior Vice President, Chief Financial Officer & Treasurer Commitmen

July 2, 2021 8-K

Entry into a Material Definitive Agreement, 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 1, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

July 2, 2021 EX-10.1

Lock-Up Agreement, between the Registrant and the Carlyle Shareholders, dated as of July 1, 2021

Exhibit 10.1 Execution Version LOCK-UP AGREEMENT July 1, 2021 MKS Instruments, Inc. 2 Tech Drive, Suite 201 Andover, MA 01810 USA Ladies and Gentlemen: This letter agreement (this ?Agreement?) relates to the Implementation Agreement, dated as of July 1, 2021 (the ?Implementation Agreement?), by and among MKS Instruments, Inc., a Massachusetts corporation (?MKS?) and Atotech Limited, a registered p

July 2, 2021 EX-2.1

Implementation Agreement, between the Registrant and Atotech Limited, dated as of July 1, 2021

Exhibit 2.1 1 July 2021 (1) ATOTECH LIMITED (2) MKS INSTRUMENTS, INC. IMPLEMENTATION AGREEMENT 99 Bishopsgate London EC2M 3XF United Kingdom Tel: +44.20.7710.1000 www.lw.com CONTENTS Clause Page 1. INTERPRETATION 2 2. CASH CONSIDERATION 12 3. SHARE CONSIDERATION 12 4. CONDITIONS 13 5. IMPLEMENTATION OF THE ACQUISITION 15 6. DOCUMENTATION, INFORMATION AND UNDERTAKINGS 17 7. DIRECTORS? AND OFFICERS?

July 1, 2021 EX-99.2

Safe Harbor for Forward-Looking Statements Statements in this presentation regarding the proposed transaction (the “transaction”) between MKS Instruments, Inc. (“MKS”) and Atotech Limited (“Atotech”), the expected timetable for completing the transac

Exhibit 99.2 Optimizing the Interconnect: The Next Frontier For Miniaturization & Complexity July 1, 2021 MKS To Acquire AtotechExhibit 99.2 Optimizing the Interconnect: The Next Frontier For Miniaturization & Complexity July 1, 2021 MKS To Acquire Atotech Safe Harbor for Forward-Looking Statements Statements in this presentation regarding the proposed transaction (the ?transaction?) between MKS I

July 1, 2021 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): July 1, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

July 1, 2021 EX-99.1

MKS Instruments to Acquire Atotech

Exhibit 99.1 MKS Instruments to Acquire Atotech ? $5.1 billion cash and stock transaction combines capabilities in lasers, optics, motion and process chemistry to enable next-generation advanced electronics ? Accelerates interconnect solutions for customers to address increasing miniaturization demands that enables integration of chips to devices ? Recurring consumables portfolio for leading edge

June 10, 2021 SC 13G/A

MKSI / MKS Instruments, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: MKS Instruments Inc. Title of Class of Securities: Common Stock CUSIP Number: 55306N104 Date of Event Which Requires Filing of this Statement: May 28, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Ru

May 27, 2021 SD

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT MKS Instruments, Inc. (Exact name of the registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdic

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT MKS Instruments, Inc. (Exact name of the registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation or organization) (Commission File Number) (IRS Employer Identification No.) 2 Tech Drive, Suite 201, Andover, Massachusetts 0181

May 27, 2021 EX-1.01

MKS INSTRUMENTS, INC. Conflict Minerals Report For the Year Ended December 31, 2020

Exhibit 1.01 MKS INSTRUMENTS, INC. Conflict Minerals Report For the Year Ended December 31, 2020 Special Note Regarding Forward-Looking Statements This report contains ?forward-looking statements? within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (Exch

May 12, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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): May 11, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

May 10, 2021 EX-99.1

MKS Instruments Announces Agreement to Acquire Photon Control

EX-99.1 4 d433023dex991.htm EX-99.1 Exhibit 99.1 MKS Instruments Announces Agreement to Acquire Photon Control • Expands Technology Solutions for Key Customers in Semiconductor Market • Acquiring a Leader in Optical Sensors for Temperature Control used in Semiconductor Wafer Fabrication • Enhances the MKS Surround the Chamber® Portfolio ANDOVER, Mass., May 10, 2021 — (GLOBE NEWSWIRE) — MKS Instrum

May 10, 2021 EX-10.2

Amendment No. 2 to ABL Credit Agreement, dated as of May 6, 2021, by and among the Company, the other loan parties party thereto, each lender party thereto and Barclays Bank PLC, as administrative agent.

Exhibit 10.2 Execution Version AMENDMENT NO. 2 TO ABL CREDIT AGREEMENT dated as of May 6, 2021, among MKS INSTRUMENTS, INC., as the Borrower, the other Loan Parties party hereto, the Lenders party hereto, and BARCLAYS BANK PLC, as Administrative Agent AMENDMENT NO. 2 TO ABL CREDIT AGREEMENT This AMENDMENT NO. 2 TO ABL CREDIT AGREEMENT, dated as of May 6, 2021 (this ?Agreement?), by and among MKS I

May 10, 2021 EX-10.1

Amendment No. 7 to Term Loan Credit Agreement, dated as of May 6, 2021, by and among the Company, the other loan parties party thereto, each lender party thereto and Barclays Bank PLC, as administrative agent.

EX-10.1 2 d433023dex101.htm EX-10.1 Exhibit 10.1 EXECUTION VERSION AMENDMENT NO. 7 TO TERM LOAN CREDIT AGREEMENT dated as of May 6, 2021, among MKS INSTRUMENTS, INC., as the Borrower, the other Loan Parties party hereto, the Lenders party hereto, and BARCLAYS BANK PLC, as Administrative Agent AMENDMENT NO. 7 TO TERM LOAN CREDIT AGREEMENT This AMENDMENT NO. 7 TO TERM LOAN CREDIT AGREEMENT, dated as

May 10, 2021 8-K

Entry into a Material Definitive Agreement, 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 6, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

May 4, 2021 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 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 0-23621 MKS INSTRUMENTS, INC.

April 26, 2021 EX-99.1

MKS Instruments Reports First Quarter 2021 Financial Results

EX-99.1 2 d174899dex991.htm EX-99.1 EXHIBIT 99.1 MKS Instruments Reports First Quarter 2021 Financial Results • Record revenue of $694 million, up 30% year-over-year • Record Non-GAAP net earnings of $143 million, up 68% year-over-year, and GAAP net income of $122 million, up 77% year-over-year • Operating cash flow of $127 million, up 69% year-over-year, and free cash flow of $100 million, up 55%

April 26, 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): April 26, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissi

March 26, 2021 DEF 14A

- DEF 14A

DEF 14A 1 d104095ddef14a.htm DEF 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION 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 app

March 26, 2021 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 8, 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): March 8, 2021 MKS INSTRUMENTS, INC. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissio

March 8, 2021 EX-99.1

MKS Instruments Confirms Revised Offer to Acquire Coherent for $250 per Share

EX-99.1 2 d219573dex991.htm EX-99.1 Exhibit 99.1 MKS Instruments Confirms Revised Offer to Acquire Coherent for $250 per Share ANDOVER, MA – March 08, 2021 – MKS Instruments, Inc. (NASDAQ: MKSI), a global provider of technologies that enable advanced processes and improve productivity, today confirmed that it had submitted a revised offer on March 5, 2021 to acquire all outstanding shares of Coher

March 8, 2021 425

Merger Prospectus - 425

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, 2021 MKS INSTRUMENTS, INC. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissio

February 26, 2021 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): February 24, 2021 MKS INSTRUMENTS, INC. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commi

February 23, 2021 10-K

Annual Report - 10-K

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, 2020 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 0-23621 MKS INSTRUMENTS,

February 23, 2021 EX-10.37

Employment Agreement, effective January 1, 2020, between David Henry and the Registrant

EX-10.37 3 mksi-ex1037269.htm EX-10.37 Exhibit 10.37 EMPLOYMENT AGREEMENT MKS Instruments, Inc., a Massachusetts corporation (the “Company”), and David Henry of Methuen, MA (“Employee”) agree, effective January 1, 2020 as follows. 1.Employment. The Company is employing Employee on an at-will basis in the position of Senior Vice President, Corporate Marketing and PMO. Employee agrees to comply with

February 23, 2021 EX-10.36

Employment Agreement, effective February 18, 2021, between Mark Gitin, the Registrant and Newport Corporation

Exhibit 10.36 EMPLOYMENT AGREEMENT Employment Agreement effective February 18, 2021 (the ?Effective Date?) (?Employment Agreement?) by and between, on the one hand, MKS Instruments, Inc., a Massachusetts corporation (?MKS?), and Newport Corporation, a Nevada corporation (the ?Company?), and on the other hand, Mark Gitin of Mountain View, CA (?Employee?). WHEREAS, the Company is a wholly-owned subs

February 23, 2021 EX-21.1

Subsidiaries of the Registrant

EXHIBIT 21.1 SUBSIDIARIES OF THE REGISTRANT SUBSIDIARY JURISDICTION OF INCORPORATION Beijing Newport Spectra-Physics Technologies Co., Ltd. China Electro Scientific Industries Europe Ltd United Kingdom Electro Scientific Industries GmbH Germany Electro Scientific Industries Singapore Pte. Ltd. Singapore Electro Scientific Industries, Inc. Oregon Eolite Systems SAS France ESI China, Inc. Oregon ESI

February 23, 2021 EX-10.38

Employment Agreement, effective February 17, 2021, between Eric Taranto and the Registrant

Exhibit 10.38 EMPLOYMENT AGREEMENT Employment Agreement effective February 17, 2021 (the ?Effective Date?) (the ?Employment Agreement?) by and between MKS Instruments, Inc., a Massachusetts corporation (the ?Company?), and Eric Taranto of Bedford, NH (?Employee?). WHEREAS, the Company and Employee entered into an Employment Agreement on or about August 22, 2018 (the ?Prior Employment Agreement?);

February 17, 2021 425

Merger Prospectus - 425

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 17, 2021 MKS INSTRUMENTS, INC. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commi

February 17, 2021 EX-99.1

Safe Harbor For Forward-Looking Statements Statements in this document regarding the proposed transaction between MKS and Coherent, future financial and operating results, benefits and synergies of the transaction, financing for the transaction, futu

EX-99.1 2 d130872dex991.htm EX-99.1 The Case for MKS + Coherent Accelerating the Adoption of Laser-Based Manufacturing February 17, 2021 Exhibit 99.1 Safe Harbor For Forward-Looking Statements Statements in this document regarding the proposed transaction between MKS and Coherent, future financial and operating results, benefits and synergies of the transaction, financing for the transaction, futu

February 17, 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): February 17, 2021 MKS INSTRUMENTS, INC. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commi

February 16, 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): February 16, 2021 MKS INSTRUMENTS, INC. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commi

February 16, 2021 425

Merger Prospectus - 425

425 1 d105797d425.htm 425 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 16, 2021 MKS INSTRUMENTS, INC. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdictio

February 16, 2021 SC 13G/A

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* MKS Instruments, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 55306N104 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this

February 16, 2021 EX-99.1

February 16, 2021

EX-99.1 2 d105797dex991.htm EX-99.1 Exhibit 99.1 February 16, 2021 Board of Directors Coherent Inc. 5100 Patrick Henry Drive Santa Clara, CA 95054 To the Members of the Board: We appreciate the constructive and professional engagement of Coherent’s team with us over the past week as we discussed together the substantial merits of a business combination with MKS Instruments. We have long admired Co

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)* Name of issuer: MKS Instruments Inc. Title of Class of Securities: Common Stock CUSIP Number: 55306N104 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

February 8, 2021 425

Merger Prospectus - 425

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 8, 2021 MKS INSTRUMENTS, INC. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commis

February 8, 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): February 8, 2021 MKS INSTRUMENTS, INC. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commis

February 8, 2021 EX-99.1

MKS Instruments Makes Superior Offer to Acquire Coherent Implied Value of Approximately $240 per Share, Transaction Value at $6 Billion

EX-99.1 Exhibit 99.1 MKS Instruments Makes Superior Offer to Acquire Coherent Implied Value of Approximately $240 per Share, Transaction Value at $6 Billion • Creates a global leader in photonics to accelerate customer solutions • Offer represents 16% premium over implied value of Lumentum transaction • Expected to be accretive to Non-GAAP earnings per share within 12 months of close • Anticipated

February 4, 2021 SC 13G/A

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* MKS INSTRUMENTS INC (Name of Issuer) Common Stock (Title of Class of Securities) 55306N104 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Sc

January 27, 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): January 27, 2021 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commis

January 27, 2021 EX-99.1

MKS Instruments Reports Fourth Quarter And Full Year 2020 Financial Results

EX-99.1 2 d57903dex991.htm EX-99.1 EXHIBIT 99.1 MKS Instruments Reports Fourth Quarter And Full Year 2020 Financial Results • Record quarterly revenue of $660 million, up 32% year-over-year • Record quarterly Non-GAAP net earnings of $130 million, up 96% year-over-year, and quarterly net income of $116 million, up 170% year-over-year • Record annual operating cash flow of $513 million, up 110% yea

November 3, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 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 0-23621 MKS INSTRUMENTS, INC.

October 27, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - 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 27, 2020 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commis

October 27, 2020 EX-99.1

MKS Instruments Reports Third Quarter 2020 Financial Results

EX-99.1 EXHIBIT 99.1 MKS Instruments Reports Third Quarter 2020 Financial Results • Record quarterly consolidated revenue of $590 million, up 28% year-over-year • Record quarterly Semiconductor Market revenue of $359 million, up 61% year-over-year • Quarterly non-GAAP net earnings per diluted share of $1.93, up 72% year-over-year • Quarterly GAAP net income per diluted share of $1.66 • Record quar

August 3, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 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 0-23621 MKS INSTRUMENTS, INC.

July 29, 2020 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): July 29, 2020 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissio

July 29, 2020 EX-99.1

MKS Instruments Reports Second Quarter 2020 Financial Results

EX-99.1 2 d935559dex991.htm EX-99.1 EXHIBIT 99.1 MKS Instruments Reports Second Quarter 2020 Financial Results • Quarterly revenue of $544 million, up 15% year-over-year • Quarterly Semiconductor Market revenue of $321 million, up 50% year-over-year, led by record revenue in our Power Solutions business • Quarterly non-GAAP net earnings per diluted share of $1.62, up 49% year-over-year • Quarterly

May 29, 2020 EX-1.01

MKS INSTRUMENTS, INC. Conflict Minerals Report For the Year Ended December 31, 2019

EX-1.01 2 d863995dex101.htm EX-1.01 Exhibit 1.01 MKS INSTRUMENTS, INC. Conflict Minerals Report For the Year Ended December 31, 2019 Special Note Regarding Forward-Looking Statements This report contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933, as amended and Section 21E of the Securities Exc

May 29, 2020 SD

- SD

SD UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM SD SPECIALIZED DISCLOSURE REPORT MKS Instruments, Inc. (Exact name of the registrant as specified in its charter) Massachusetts 0-23621 04-2277512 (State or other jurisdiction of incorporation or organization) (Commission File Number) (IRS Employer Identification No.) 2 Tech Drive, Suite 201, Andover, Massachusetts 018

May 13, 2020 8-K

Financial Statements and Exhibits, 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): May 11, 2020 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commission

May 6, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 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 0-23621 MKS INSTRUMENTS, INC.

May 6, 2020 EX-10.2

MKS Instruments, Inc. Annual Profit Improvement Bonus Plan

EX-10.2 2 mksi-ex102144.htm EX-10.2 Exhibit 10.2 MKS Instruments, Inc. Annual Profit Improvement Bonus Plan (as approved by the Board of Directors on February 10, 2020) 1. Purpose: The Annual Profit Improvement Bonus Plan (the “Profit Improvement Bonus Plan”) provides those employees of MKS Instruments, Inc. and its affiliates (“MKS” or the “Company”) who are eligible to participate in the MKS Ins

April 28, 2020 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): April 28, 2020 MKS Instruments, Inc. (Exact name of registrant as specified in its charter) Massachusetts 000-23621 04-2277512 (State or other jurisdiction of incorporation) (Commissi

April 28, 2020 EX-99.1

MKS Instruments Reports First Quarter 2020 Financial Results

EX-99.1 2 d909050dex991.htm EX-99.1 EXHIBIT 99.1 MKS Instruments Reports First Quarter 2020 Financial Results • Quarterly revenue of $536 million, up 7% sequentially and up 16% year-over-year • Quarterly Non-GAAP net earnings of $85 million, or $1.54 per diluted share • Quarterly GAAP net income of $69 million, or $1.25 per diluted share Andover, MA, April 28, 2020 — MKS Instruments, Inc. (NASDAQ:

April 8, 2020 DEFA14A

MKSI / MKS Instruments, Inc. DEFA14A - - DEFA14A

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 27, 2020 DEF 14A

MKSI / MKS Instruments, Inc. DEF 14A - - DEF 14A

DEF 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 27, 2020 DEFA14A

MKSI / MKS Instruments, Inc. DEFA14A - - DEFA14A

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 14A (Rule 14A-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

February 28, 2020 EX-21.1

Subsidiaries of the Registrant

EX-21.1 EXHIBIT 21.1 SUBSIDIARIES OF THE REGISTRANT SUBSIDIARY JURISDICTION OF INCORPORATION Beijing Newport Spectra-Physics Technologies Co., Ltd. China Electro Scientific Industries Europe Ltd United Kingdom Electro Scientific Industries GmbH Germany Electro Scientific Industries Singapore Pte. Ltd. Singapore Electro Scientific Industries, Inc. Oregon Eolite Systems SAS France ESI China, Inc. Or

February 28, 2020 EX-10.29

Employment Agreement, effective September 16, 2019, between James A. Schreiner and the Registrant

EX-10.29 4 d114808dex1029.htm EX-10.29 Exhibit 10.29 EMPLOYMENT AGREEMENT MKS Instruments, Inc., a Massachusetts corporation (the “Company”), and James A. Schreiner of Savage, MN (“Employee”) agree, effective September 16, 2019, as follows. 1. Employment. The Company is employing Employee on an at-will basis in the position of Chief Operating Officer. Employee agrees to comply with the Company’s p

February 28, 2020 10-K

Annual Report - 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, 2019 or ☐ TRA NSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File number 0-2362

February 28, 2020 EX-4.1

Specimen certificate representing the Common Stock

EX-4.1 Exhibit 4.1 MKS MKS INSTRUMENTS, INC. COMMON STOCK SEE REVERSE FOR CERTAIN DEFINITIONS INCORPORATED UNDER THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS CUSIP 55306N 10 4 THIS CERTIFIES THAT is the owner of FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, NO PAR VALUE, OF MKS INSTRUMENTS, INC. transferable Certificate and only the on shares the books represented of the Corporation hereb

February 28, 2020 EX-4.2

Description of Capital Stock Registered Under Section 12 of the Exchange Act

EX-4.2 Exhibit 4.2 MKS INSTRUMENTS, INC. DESCRIPTION OF CAPITAL STOCK REGISTERED UNDER SECTION 12 OF THE EXCHANGE ACT The following description is a summary of the terms of our capital stock registered pursuant to Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and is qualified in its entirety by reference to our Restated Articles of Organization, as amended (“Ch

Other Listings
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