MKS Inc.

MKSI·NASDAQ·$334.11Share Price as of 11/2·$23BMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/06/26 10-QQ1 ended 03/31/2605/07/26 10-KFY 202502/24/26 10-QQ3 ended 09/30/2511/06/25 10-QQ2 ended 06/30/2508/07/25

Disclosures

8-KCurrent report10/19/26 8-KCurrent report08/05/26 8-KCurrent report05/12/26 8-KCurrent report05/06/26 8-KCurrent report04/06/26

Prospectuses and Registrations

S-8Registration of securities for employees05/11/26 POS AMPost-effective amendment02/21/24 424B7Prospectus06/05/23 424B7Prospectus06/01/23 S-3ASRAutomatic shelf registration08/24/22

Proxies

DEF 14ADefinitive proxy03/31/26 DEFA14AAdditional proxy materials03/31/26 PRE 14APreliminary proxy03/20/26 DEF 14ADefinitive proxy04/01/25 DEFA14AAdditional proxy materials04/01/25

Ownership

SC 13G/ABeneficial ownership (amended)09/03/26 Form 4Insider transaction09/02/26 144Proposed sale of securities09/01/26 Form 4Insider transaction08/18/26 Form 4Insider transaction08/17/26

Other

SDConflict Minerals disclosure05/28/26 ARSAnnual report to shareholders03/31/26 SDConflict Minerals disclosure05/29/25 ARSAnnual report to shareholders04/01/25 SDConflict Minerals disclosure05/23/24