Ramakumar Mayampurath - 17 Nov 2025 Form 4 Insider Report for MKS INC (MKSI)

Role
EVP & CFO
Signature
/s/ James Kruger, attorney-in-fact
Issuer symbol
MKSI
Transactions as of
17 Nov 2025
Net transactions value
-$375,121
Form type
4
Filing time
18 Nov 2025, 14:32:57 UTC
Previous filing
19 Feb 2025
Next filing
09 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Mayampurath Ramakumar EVP & CFO C/O MKS INC., 2 TECH DRIVE, ANDOVER /s/ James Kruger, attorney-in-fact 18 Nov 2025 0001859332

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MKSI Common Stock Options Exercise +8,295 8,295 17 Nov 2025 Direct F1
transaction MKSI Common Stock Tax liability $375,121 -2,628 -32% $142.74 5,667 17 Nov 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 -8,295 -34% 16,402 17 Nov 2025 Common Stock 8,295 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 November 15, 2025, provided that if, in any vesting year, November 15th is not a business day, such vesting shall occur on the next business day.