MKS Inc. MKSI NASDAQ

NASDAQ Global Select • Technology • Hardware, Equipment & Parts • US • USD

SharesGrow Score

49/100

1/7 Pass

SharesGrow Intrinsic Value

MKS Inc. (MKSI) has 20 known insider and institutional holders on record. The largest holder is Carlyle Partners VI Cayman Holdings, L.P. with 6,482,732 shares. Other notable holders include Carlyle Group Inc. and Lee John Tseng-Chung.

Over the last 12 months, insiders have made 31 transactions in MKSI stock — 10 buys (valued at RSU Award) and 15 sells (valued at $10.98M). Insider selling has exceeded buying during this period.

MKSI Insider Ownership

Top Holder

Carlyle Partners VI Cayman Holdings, L.P.

6,482,732 shares

Buys (12 mo)

$0.00 value

Sells (12 mo)

$10.98M value

12-Month Transaction Activity

Buy 32%

Sell 48%

Top Insider Holders

#	Name	Role	Shares Owned	Last Filed	Relative Size
1	Carlyle Partners Vi Cayman Holdings, L.p.	10 Percent Owner	6,482,732	2023-05-10	100%
2	Carlyle Group Inc.	10 Percent Owner	6,482,732	2023-05-10	100%
3	Lee John Tseng-chung	President & CEO	154,696	2026-02-23	2%
4	Wild Geoffrey	Director	105,807	2022-08-18	2%
5	Bertucci John R	Director	67,275	2019-05-09	1%
6	Burke Kathleen Flaherty	EVP, Gc & Secretary	53,794	2026-02-23	1%
7	Colella Gerald G	Director	50,017	2026-02-24	1%
8	Schreiner James Alan	EVP & COO	23,402	2026-02-25	0%
9	Henry David Philip	EVP, Global Str Mktg & GM, Msd	18,841	2026-02-23	0%
10	Mora Elizabeth	Director	18,663	2026-03-03	0%
11	Quirk Brian Charles	Sr. VP, Global Operations	17,641	2018-05-08	0%
12	Taranto Eric Robert	EVP & GM, Vsd	15,445	2026-03-09	0%
13	Batra Raj	Director	15,445	2025-05-13	0%
14	Donahue Joseph B	Director	11,351	2025-05-13	0%
15	Gitin Mark Milton	EVP & GM, Psd	11,113	2024-02-16	0%
16	Warner Michelle M	Director	10,852	2024-05-08	0%
17	Moloney Jacqueline F	Director	10,393	2026-03-13	0%
18	Mayampurath Ramakumar	EVP & CFO	8,625	2026-02-18	0%
19	Cannone Peter Iii	Director	8,362	2026-02-23	0%
20	Colella Gerard G	Director	8,217	2025-05-13	0%

Recent Transactions (last 12 months)

Date	Name	Role	Type	Shares	Price	Value
2026-03-12	Moloney Jacqueline F	Director	Informative Sell	340	$213.77	$72.68K
2026-03-06	Taranto Eric Robert	EVP & GM, Vsd	Informative Sell	4,568	$220.52	$1.01M
2026-03-02	Mora Elizabeth	Director	Informative Sell	300	$239.44	$71.83K
2026-02-24	Schreiner James Alan	EVP & COO	Informative Sell	4,100	$255.00	$1.05M
2026-02-24	Colella Gerald G	Director	Informative Sell	10,000	$253.97	$2.54M
2026-02-20	Colella Gerald G	Director	Informative Sell	10,000	$252.90	$2.53M
2026-02-20	Henry David Philip	EVP, Global Str Mktg & GM, Msd	Informative Sell	2,000	$261.56	$523.12K
2026-02-20	Taranto Eric Robert	EVP & GM, Vsd	Informative Sell	1,453	$247.55	$359.69K
2026-02-20	Burke Kathleen Flaherty	EVP, Gc & Secretary	Informative Sell	4,254	$250.00	$1.06M
2026-02-20	Mccarthy Michelle M	VP & Chief Accounting Officer	Informative Sell	816	$250.35	$204.28K
2026-02-20	Williams John Edward	EVP & GM, Psd	Informative Sell	2,043	$256.41	$523.84K
2026-02-20	Moloney Jacqueline F	Director	Informative Sell	829	$247.55	$205.22K
2026-02-20	Lee John Tseng-chung	President & CEO	Informative Sell	1,890	$259.70	$490.84K
2026-02-20	Cannone Peter Iii	Director	Informative Sell	1,250	$258.06	$322.58K
2026-02-17	Mayampurath Ramakumar	EVP & CFO	Option Exercise	2,958	-	-
2026-02-17	Henry David Philip	EVP, Global Str Mktg & GM, Msd	Option Exercise (Sell)	2,054	-	-
2026-02-17	Taranto Eric Robert	EVP & GM, Vsd	Option Exercise (Sell)	1,303	-	-
2026-02-17	Schreiner James Alan	EVP & COO	Option Exercise (Sell)	1,944	-	-
2026-02-17	Burke Kathleen Flaherty	EVP, Gc & Secretary	Option Exercise (Sell)	2,493	-	-
2026-02-17	Williams John Edward	EVP & GM, Psd	Option Exercise	300	-	-
2026-02-17	Lee John Tseng-chung	President & CEO	Option Exercise (Sell)	7,654	-	-
2025-06-02	Mora Elizabeth	Director	Informative Sell	300	$81.78	$24.53K
2025-05-12	Jabre Wissam G	Director	RSU Award	2,479	-	-
2025-05-12	Batra Raj	Director	RSU Award	2,479	-	-
2025-05-12	Mora Elizabeth	Director	RSU Award	2,479	-	-