0001959173-23-003799.txt : 20230906 0001959173-23-003799.hdr.sgml : 20230906 20230906170809 ACCESSION NUMBER: 0001959173-23-003799 CONFORMED SUBMISSION TYPE: 144 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20230906 DATE AS OF CHANGE: 20230906 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] 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: 231240030 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 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

25000 2432583.38 66862788 09/06/2023 NASDAQ Common 02/15/2018 Restricted Stock Vesting Issuer N 5069 02/15/2018 Compensation Common 05/31/2018 ESPP Purchase Issuer N 134 05/31/2018 Cash Common 11/30/2018 ESPP Purchase Issuer N 109 11/30/2018 Cash Common 02/15/2019 Restricted Stock Vesting Issuer N 13371 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 02/15/2020 Restricted Stock Vesting Issuer N 42 02/15/2020 Compensation 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 02/15/2021 Restricted Stock Vesting Issuer N 122 02/15/2021 Compensation Common 05/28/2021 ESPP Purchase Issuer N 89 05/28/2021 Cash Common 10/28/2021 Restricted Stock Vesting Issuer N 2425 10/28/2021 Compensation Common 11/30/2021 ESPP Purchase Issuer N 67 11/30/2021 Cash Common 02/15/2022 Restricted Stock Vesting Issuer N 3008 02/15/2022 Compensation Y 09/06/2023 /s/ Ryan Riviere, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Seth H. Bagshaw