MKSI

Technology

MKS Inc.

$213.66+0.17 (+0.08%)

Prev Close

$213.49

Open

$216.69

High

$224.72

Low

$212.08

Volume

586.4K

Market Cap

$17.09B

P/E

51.73

Div Yield

—

Over the past 12 months, insider activity at MKS Inc. (MKSI) has been exclusively selling, with 0 insider purchases totaling $0.00 and 29 insider sales totaling $53.29M. The most recent insider transaction was by Moloney Jacqueline F (director), who sold $72.7K worth of shares on Mar 13, 2026. MKS Inc. operates in the Technology sector, within the Hardware, Equipment & Parts industry, with a market cap of $17.09B.

Buys (12M)

$0.00

Sells (12M)

$53.29M

Net Activity

Net Seller

$53.29M

Active Insiders

last 12 mo

MKSI Price Chart

MKSI Insider Trading Activity

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Mar 13, 2026↗	Moloney Jacqueline F	director	Sell	340	$213.77	$72.7K	10,393.2
Mar 9, 2026↗	Taranto Eric Robert	officer: EVP & GM, VSD	Sell	4,567	$220.52	$1.01M	15,444.8
Mar 3, 2026↗	Mora Elizabeth	director	Sell	300	$239.44	$71.8K	18,663.4
Feb 25, 2026↗	Schreiner James Alan	officer: EVP & COO	Sell	4,100	$255.00	$1.05M	23,402
Feb 24, 2026↗	COLELLA GERALD G	director	Sell	40,000	$253.43	$10.14M	50,017
Feb 23, 2026↗	Burke Kathleen Flaherty	officer: EVP, GC & Secretary	Sell	4,254	$250.00	$1.06M	53,794.5
Feb 23, 2026↗	CANNONE PETER III	director	Sell	1,250	$258.06	$322.6K	8,362.08
Feb 23, 2026↗	Henry David Philip	officer: EVP, Global Str Mktg & GM, MSD	Sell	2,000	$261.56	$523.1K	18,841.4
Feb 23, 2026↗	Lee John Tseng-Chung	director, officer: President & CEO	Sell	30,000	$256.77	$7.70M	171,386
Feb 23, 2026↗	McCarthy Michelle M	officer: VP & Chief Accounting Officer	Sell	1,466	$250.00	$366.5K	816
Feb 23, 2026↗	Moloney Jacqueline F	director	Sell	829	$247.55	$205.2K	10,733.3
Feb 23, 2026↗	Taranto Eric Robert	officer: EVP & GM, VSD	Sell	1,452	$247.55	$359.4K	20,012.6
Feb 23, 2026↗	Williams John Edward	officer: EVP & GM, PSD	Sell	2,042	$256.41	$523.6K	3,640.1
Feb 20, 2026↗	Burke Kathleen Flaherty	EVP, GC & Secretary	Sell	4,254	$250.00	$1.06M	0
Feb 20, 2026↗	CANNONE PETER III	Director	Sell	1,250	$258.06	$322.6K	0
Feb 20, 2026↗	COLELLA GERALD G	Director	Sell	20,000	$253.43	$5.07M	50,017
Feb 20, 2026↗	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Sell	2,000	$261.56	$523.1K	0
Feb 20, 2026↗	Lee John Tseng-Chung	President & CEO	Sell	30,000	$256.77	$7.70M	0
Feb 20, 2026↗	McCarthy Michelle M	VP & Chief Accounting Officer	Sell	1,466	$250.00	$366.5K	0
Feb 20, 2026↗	Moloney Jacqueline F	Director	Sell	829	$247.55	$205.2K	0
Feb 20, 2026↗	Taranto Eric Robert	EVP & GM, VSD	Sell	1,453	$247.50	$359.6K	0
Feb 20, 2026↗	Williams John Edward	EVP & GM, PSD	Sell	2,043	$256.36	$523.7K	0
Feb 17, 2026↗	Burke Kathleen Flaherty	EVP, GC & Secretary	Sell	5,318	$260.73	$1.39M	0
Feb 17, 2026↗	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Sell	4,097	$260.76	$1.07M	0
Feb 17, 2026↗	Lee John Tseng-Chung	President & CEO	Sell	32,548	$260.74	$8.49M	0
Feb 17, 2026↗	Mayampurath Ramakumar	EVP & CFO	Sell	2,516	$260.73	$656.0K	0
Feb 17, 2026↗	Schreiner James Alan	EVP & COO	Sell	4,344	$260.73	$1.13M	0
Feb 17, 2026↗	Taranto Eric Robert	EVP & GM, VSD	Sell	2,712	$260.72	$707.1K	0
Feb 17, 2026↗	Williams John Edward	EVP & GM, PSD	Sell	1,195	$260.85	$311.7K	0

MKSI Insider Buying Activity

The following table shows recent insider purchases of MKS Inc. (MKSI) stock reported via SEC Form 4 filings.

No insider buying activity found for MKSI in the last 12 months.

MKSI Insider Selling Activity

The following table shows recent insider sales of MKS Inc. (MKSI) stock reported via SEC Form 4 filings.

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Mar 13, 2026↗	Moloney Jacqueline F	director	Sell	340	$213.77	$72.7K	10,393.2
Mar 9, 2026↗	Taranto Eric Robert	officer: EVP & GM, VSD	Sell	4,567	$220.52	$1.01M	15,444.8
Mar 3, 2026↗	Mora Elizabeth	director	Sell	300	$239.44	$71.8K	18,663.4
Feb 25, 2026↗	Schreiner James Alan	officer: EVP & COO	Sell	4,100	$255.00	$1.05M	23,402
Feb 24, 2026↗	COLELLA GERALD G	director	Sell	40,000	$253.43	$10.14M	50,017
Feb 23, 2026↗	Burke Kathleen Flaherty	officer: EVP, GC & Secretary	Sell	4,254	$250.00	$1.06M	53,794.5
Feb 23, 2026↗	CANNONE PETER III	director	Sell	1,250	$258.06	$322.6K	8,362.08
Feb 23, 2026↗	Henry David Philip	officer: EVP, Global Str Mktg & GM, MSD	Sell	2,000	$261.56	$523.1K	18,841.4
Feb 23, 2026↗	Lee John Tseng-Chung	director, officer: President & CEO	Sell	30,000	$256.77	$7.70M	171,386
Feb 23, 2026↗	McCarthy Michelle M	officer: VP & Chief Accounting Officer	Sell	1,466	$250.00	$366.5K	816
Feb 23, 2026↗	Moloney Jacqueline F	director	Sell	829	$247.55	$205.2K	10,733.3
Feb 23, 2026↗	Taranto Eric Robert	officer: EVP & GM, VSD	Sell	1,452	$247.55	$359.4K	20,012.6
Feb 23, 2026↗	Williams John Edward	officer: EVP & GM, PSD	Sell	2,042	$256.41	$523.6K	3,640.1
Feb 20, 2026↗	Burke Kathleen Flaherty	EVP, GC & Secretary	Sell	4,254	$250.00	$1.06M	0
Feb 20, 2026↗	CANNONE PETER III	Director	Sell	1,250	$258.06	$322.6K	0
Feb 20, 2026↗	COLELLA GERALD G	Director	Sell	20,000	$253.43	$5.07M	50,017
Feb 20, 2026↗	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Sell	2,000	$261.56	$523.1K	0
Feb 20, 2026↗	Lee John Tseng-Chung	President & CEO	Sell	30,000	$256.77	$7.70M	0
Feb 20, 2026↗	McCarthy Michelle M	VP & Chief Accounting Officer	Sell	1,466	$250.00	$366.5K	0
Feb 20, 2026↗	Moloney Jacqueline F	Director	Sell	829	$247.55	$205.2K	0
Feb 20, 2026↗	Taranto Eric Robert	EVP & GM, VSD	Sell	1,453	$247.50	$359.6K	0
Feb 20, 2026↗	Williams John Edward	EVP & GM, PSD	Sell	2,043	$256.36	$523.7K	0
Feb 17, 2026↗	Burke Kathleen Flaherty	EVP, GC & Secretary	Sell	5,318	$260.73	$1.39M	0
Feb 17, 2026↗	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Sell	4,097	$260.76	$1.07M	0
Feb 17, 2026↗	Lee John Tseng-Chung	President & CEO	Sell	32,548	$260.74	$8.49M	0
Feb 17, 2026↗	Mayampurath Ramakumar	EVP & CFO	Sell	2,516	$260.73	$656.0K	0
Feb 17, 2026↗	Schreiner James Alan	EVP & COO	Sell	4,344	$260.73	$1.13M	0
Feb 17, 2026↗	Taranto Eric Robert	EVP & GM, VSD	Sell	2,712	$260.72	$707.1K	0
Feb 17, 2026↗	Williams John Edward	EVP & GM, PSD	Sell	1,195	$260.85	$311.7K	0