John Edward Williams - Aug 15, 2025 Form 4 Insider Report for MKS INC (MKSI)

Role
EVP & GM, PSD
Signature
/s/ James Kruger, attorney-in-fact
Stock symbol
MKSI
Transactions as of
Aug 15, 2025
Transactions value $
-$32,257
Form type
4
Date filed
8/18/2025, 01:49 PM
Previous filing
Apr 18, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Williams John Edward EVP & GM, PSD C/O MKS INC., 2 TECH DRIVE, ANDOVER /s/ James Kruger, attorney-in-fact 2025-08-18 0001710173

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MKSI Common Stock Options Exercise +947 +31.57% 3.95K Aug 15, 2025 Direct F1
transaction MKSI Common Stock Tax liability -$32.3K -308 -7.8% $104.73 3.64K Aug 15, 2025 Direct F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction MKSI Restricted Stock Unit Options Exercise -947 -11.43% 7.34K Aug 15, 2025 Common Stock 947 Direct F1, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.
F2 These shares were withheld by MKS Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person.
F3 These RSUs vest in two equal annual installments commencing on August 15, 2024, provided that if, in any vesting year, August 15th is not a business day, such vesting shall occur on the next business day.