Michelle M. McCarthy - Apr 15, 2025 Form 4 Insider Report for MKS INSTRUMENTS INC (MKSI)

Role
VP & Chief Accounting Officer
Signature
/s/ James Kruger, attorney-in-fact
Stock symbol
MKSI
Transactions as of
Apr 15, 2025
Transactions value $
-$41,636
Form type
4
Date filed
4/17/2025, 01:51 PM
Previous filing
Aug 19, 2024
SEC
View on sec.gov

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MKSI Common Stock Options Exercise +968 968 Apr 15, 2025 Direct F1
transaction MKSI Common Stock Options Exercise +1.11K +114.26% 2.07K Apr 15, 2025 Direct F1
transaction MKSI Common Stock Tax liability -$41.6K -608 -29.32% $68.48 1.47K Apr 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 -968 -15.15% 5.42K Apr 15, 2025 Common Stock 968 Direct F1, F3
transaction MKSI Restricted Stock Unit Options Exercise -1.11K -20.4% 4.32K Apr 15, 2025 Common Stock 1.11K Direct F1, F3
transaction MKSI Restricted Stock Unit Award +5.21K +120.7% 9.53K Apr 15, 2025 Common Stock 5.21K Direct F1, F4
* 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 Instruments, Inc.
F2 These shares were withheld by MKS Instruments, 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 three equal annual installments commencing on April 15, 2025, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.
F4 These RSUs vest in three equal annual installments commencing on April 15, 2026, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.