James Alan Schreiner Mks Instruments Inc (MKSI) insider trading activity

James Alan Schreiner is EVP & COO of MKS INSTRUMENTS INC. Currently has a direct ownership of 22,534 shares of MKSI, which is worth approximately $3.24 Million. The most recent transaction as insider was on Oct 22, 2025, when has been sold 711 shares (Common Stock) at a price of $138.68 per share, resulting in proceeds of $98,601. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 22.5K

0.69% 3M change

20.48% 12M change

Total Value Held $3.24 Million

James Alan Schreiner Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Oct 22 2025	SELL Open market or private sale	$98,601 $138.68 p/Share	711 Reduced 3.06%	22,534 Common Stock
Sep 18 2025	SELL Open market or private sale	$103,912 $124.0 p/Share	838 Reduced 3.48%	23,245 Common Stock
Aug 18 2025	SELL Payment of exercise price or tax liability	$125,174 $100.22 p/Share	1,249 Reduced 4.93%	24,083 Common Stock
Aug 18 2025	BUY Exercise of conversion of derivative security	-	2,640 Added 9.44%	25,332 Common Stock
Jul 07 2025	SELL Open market or private sale	$98,035 $102.44 p/Share	957 Reduced 4.05%	22,691 Common Stock
Feb 18 2025	SELL Payment of exercise price or tax liability	$378,188 $103.67 p/Share	3,648 Reduced 13.44%	23,496 Common Stock
Feb 18 2025	BUY Exercise of conversion of derivative security	-	8,339 Added 23.5%	27,144 Common Stock
Aug 19 2024	SELL Payment of exercise price or tax liability	$223,055 $119.09 p/Share	1,873 Reduced 9.1%	18,704 Common Stock
Aug 19 2024	BUY Exercise of conversion of derivative security	-	3,961 Added 16.14%	20,577 Common Stock
Feb 15 2024	SELL Payment of exercise price or tax liability	$458,795 $122.15 p/Share	3,756 Reduced 18.57%	16,468 Common Stock
Feb 15 2024	BUY Exercise of conversion of derivative security	-	8,655 Added 29.97%	20,224 Common Stock
Feb 15 2023	SELL Payment of exercise price or tax liability	$190,450 $100.29 p/Share	1,899 Reduced 14.4%	11,291 Common Stock
Feb 15 2023	BUY Exercise of conversion of derivative security	-	6,456 Added 32.86%	13,190 Common Stock
Sep 16 2022	SELL Payment of exercise price or tax liability	$56,763 $89.11 p/Share	637 Reduced 8.73%	6,656 Common Stock
Sep 16 2022	BUY Exercise of conversion of derivative security	-	1,434 Added 16.43%	7,293 Common Stock
Feb 15 2022	SELL Payment of exercise price or tax liability	$189,467 $152.55 p/Share	1,242 Reduced 17.74%	5,758 Common Stock
Feb 15 2022	BUY Exercise of conversion of derivative security	-	3,655 Added 34.3%	7,000 Common Stock
Sep 16 2021	SELL Payment of exercise price or tax liability	$68,327 $150.5 p/Share	454 Reduced 12.18%	3,273 Common Stock
Sep 16 2021	BUY Exercise of conversion of derivative security	-	1,434 Added 27.79%	3,727 Common Stock
Feb 16 2021	SELL Payment of exercise price or tax liability	$85,756 $172.2 p/Share	498 Reduced 18.39%	2,210 Common Stock
Feb 16 2021	BUY Exercise of conversion of derivative security	-	1,696 Added 38.51%	2,708 Common Stock

JAS

James Alan Schreiner

EVP & COO

Andover, MA

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