0001959173-24-001301.txt : 20240222 0001959173-24-001301.hdr.sgml : 20240222 20240222165409 ACCESSION NUMBER: 0001959173-24-001301 CONFORMED SUBMISSION TYPE: 144 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20240222 DATE AS OF CHANGE: 20240222 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: MKS INSTRUMENTS INC CENTRAL INDEX KEY: 0001049502 STANDARD INDUSTRIAL CLASSIFICATION: INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823] ORGANIZATION NAME: 08 Industrial Applications and Services IRS NUMBER: 042277512 STATE OF INCORPORATION: MA FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 144 SEC ACT: 1933 Act SEC FILE NUMBER: 000-23621 FILM NUMBER: 24665765 BUSINESS ADDRESS: STREET 1: 2 TECH DRIVE STREET 2: SUITE 201 CITY: ANDOVER STATE: MA ZIP: 01810 BUSINESS PHONE: 978-645-5500 MAIL ADDRESS: STREET 1: 2 TECH DRIVE STREET 2: SUITE 201 CITY: ANDOVER STATE: MA ZIP: 01810 REPORTING-OWNER: COMPANY DATA: COMPANY CONFORMED NAME: BAGSHAW SETH H CENTRAL INDEX KEY: 0001192439 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 144 144 1 primary_doc.xml 144 0001192439 XXXXXXXX LIVE 0001049502 MKS INSTRUMENTS INC 000-23621 2 TECH DRIVE SUITE 201 ANDOVER MA 01810 978-645-5500 BAGSHAW SETH H Officer Common Fidelity Brokerage Services LLC

900 Salem Street Smithfield RI 02917

32865 4051627.76 66878495 02/22/2024 NASDAQ Common 02/15/2019 Restricted Stock Vesting Issuer N 3500 02/15/2019 Compensation Common 05/31/2019 ESPP Purchase Issuer N 175 05/31/2019 Cash Common 11/29/2019 ESPP Purchase Issuer N 152 11/29/2019 Cash Common 05/29/2020 ESPP Purchase Issuer N 118 05/29/2020 Cash Common 11/30/2020 ESPP Purchase Issuer N 119 11/30/2020 Cash Common 10/28/2021 Restricted Stock Vesting Issuer N 360 10/28/2021 Compensation Common 11/30/2021 ESPP Purchase Issuer N 40 11/30/2021 Cash Common 02/15/2022 Restricted Stock Vesting Issuer N 2700 02/15/2022 Compensation Common 05/31/2022 ESPP Purchase Issuer N 101 05/31/2022 Cash Common 10/28/2022 Restricted Stock Vesting Issuer N 2425 10/28/2022 Compensation Common 11/30/2022 ESPP Purchase Issuer N 77 11/30/2022 Cash Common 02/15/2023 Restricted Stock Vesting Issuer N 10629 02/15/2023 Compensation Common 05/31/2023 ESPP Purchase Issuer N 150 05/31/2023 Cash Common 11/30/2023 ESPP Purchase Issuer N 126 11/30/2023 Cash Common 02/15/2024 Restricted Stock Vesting Issuer N 12193 02/15/2024 Compensation Y 02/22/2024 /s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Seth H. Bagshaw