5 Form 4 filings for MKSI between 2026-08-04 and 2026-11-03, from 4 filers. 4 discretionary (3 sales, 0 purchases), 1 routine grant or withholding filing. 4 of 5 carry a dollar total (1 stated, 3 computed as shares × price), summing to $3,663,036; a multi-transaction filing without a stated total contributes only its largest transaction, so the sum is a floor and the true figure is higher. Prices ran $202 to $302.

Filings 5 Filers 4 Discretionary 4 Routine 1 Structured 2/5

▸Lee John Tseng-ChungPresident & CEO 2026-11-03 · surrendered (tax withholding) 2,157.445 @ $202.04 10b5-1 ×12 filings

Filed	Action	Shares largest txn	Price	Filing total	Txns	SEC
2026-11-03	surrendered (tax withholding)	2,157.445	$202.04	≥ $435,890	3	RECEIPT ↗
2026-08-17	sold 10b5-1 PLAN	10,000	$302.01	$3,020,100	—	RECEIPT ↗

▸Mora Elizabethrole unstated 2026-09-02 · sold 300 @ $250.96 for $75,288 TOTAL SOLD ≥ $75,28810b5-1 ×11 filing

Filed	Action	Shares largest txn	Price	Filing total	Txns	SEC
2026-09-02	sold 10b5-1 PLAN	300	$250.96	$75,288	1	RECEIPT ↗

▸Donlan Renee Martelrole unstated 2026-08-18 1 filing

Filed	Action	Shares largest txn	Price	Filing total	Txns	SEC
2026-08-18	Donlan Renee Martel at MKS INC filed a Form 4; no parseable transaction details were found in the filing.					RECEIPT ↗

▸Williams John Edwardrole unstated 2026-08-04 · sold 457 @ $288.31 10b5-1 ×11 filing

Filed	Action	Shares largest txn	Price	Filing total	Txns	SEC
2026-08-04	sold 10b5-1 PLAN	457	$288.31	$131,758	—	RECEIPT ↗

4 filers · 5 filings · disclosed filing totals sum to $3,663,036 (1/5 state one, 3 computed; totals are proceeds with a floor, never profit — a Form 4 states what was traded, not what it cost the filer)

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