X0508 4 2024-11-04 0001049502 MKS INSTRUMENTS INC MKSI 0001903967 JABRE WISSAM G C/O MKS INSTRUMENTS, INC. 2 TECH DRIVE, SUITE 201 ANDOVER MA 01810 1 0 Common Stock 2024-11-04 4 A 0 2008.637 A 2008.637 D These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (subject to the terms and conditions of the restricted stock unit agreement). Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Instruments, Inc. /s/ James Kruger, attorney-in-fact 2024-11-05