Kathleen Flaherty Burke Mks Instruments Inc (MKSI) insider trading activity

Kathleen Flaherty Burke is EVP, GC & Secretary of MKS INSTRUMENTS INC. Currently has a direct ownership of 51,074 shares of MKSI, which is worth approximately $7.29 Million. The most recent transaction as insider was on Oct 31, 2025, when has been sold 777 shares (Common Stock) at a price of $143.71 per share, resulting in proceeds of $111,662. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 51.1K

0.3% 3M change

18.78% 12M change

Total Value Held $7.29 Million

Kathleen Flaherty Burke Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Oct 31 2025	SELL Payment of exercise price or tax liability	$111,662 $143.71 p/Share	777 Reduced 1.5%	51,074 Common Stock
Oct 31 2025	BUY Exercise of conversion of derivative security	-	777 Added 1.48%	51,851 Common Stock
Feb 18 2025	SELL Payment of exercise price or tax liability	$411,569 $103.67 p/Share	3,970 Reduced 7.23%	50,922 Common Stock
Feb 18 2025	BUY Exercise of conversion of derivative security	-	11,645 Added 17.5%	54,892 Common Stock
Mar 01 2024	SELL Open market or private sale	$910,737 $122.89 p/Share	7,411 Reduced 14.7%	42,999 Common Stock
Feb 15 2024	SELL Payment of exercise price or tax liability	$600,000 $122.15 p/Share	4,912 Reduced 8.88%	50,410 Common Stock
Feb 15 2024	BUY Exercise of conversion of derivative security	-	12,457 Added 18.38%	55,322 Common Stock

Aug 07 2023	SELL Open market or private sale	$1,170,638 $101.24 p/Share	11,563 Reduced 21.29%	42,737 Common Stock
Feb 15 2023	SELL Payment of exercise price or tax liability	$348,407 $100.29 p/Share	3,474 Reduced 6.03%	54,150 Common Stock
Feb 15 2023	BUY Exercise of conversion of derivative security	-	10,105 Added 14.92%	57,624 Common Stock
Oct 28 2022	SELL Payment of exercise price or tax liability	$81,789 $84.58 p/Share	967 Reduced 2.0%	47,442 Common Stock
Oct 28 2022	BUY Exercise of conversion of derivative security	-	2,179 Added 4.31%	48,409 Common Stock
Feb 15 2022	SELL Payment of exercise price or tax liability	$565,655 $152.55 p/Share	3,708 Reduced 7.44%	46,128 Common Stock
Feb 15 2022	BUY Exercise of conversion of derivative security	-	9,037 Added 15.35%	49,836 Common Stock
Oct 28 2021	SELL Payment of exercise price or tax liability	$140,931 $145.74 p/Share	967 Reduced 2.32%	40,731 Common Stock
Oct 28 2021	BUY Exercise of conversion of derivative security	-	2,179 Added 4.97%	41,698 Common Stock
Feb 16 2021	SELL Payment of exercise price or tax liability	$555,345 $172.2 p/Share	3,225 Reduced 7.56%	39,430 Common Stock
Feb 16 2021	BUY Exercise of conversion of derivative security	-	8,109 Added 15.97%	42,655 Common Stock

KFB

Kathleen Flaherty Burke

EVP, GC & Secretary

Andover, MA

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