MKSI

Mks Inc

Company with tickers: MKSI

CIK

1049502

CUSIP

55306N104

Shares Outstanding

67,544,129

Website

https://www.mks.com

13F Activity (30d)

186 filings 185 filers

Trades by corporate insiders — officers, directors and holders of more than 10% of the shares — disclosed to the SEC on Forms 3, 4 and 5. Form 4 must be filed within two business days of the trade.

Insider Sentiment Score

Peer-relative 0–100 rank of how aggressively insiders accumulated over the trailing 90 days. See the full ranking.

Net buyers

-12

Net shares bought

-0.09%

Net buy value

$20,587,221

Date	Insider	Role	Type	Shares	Price	Value	After
2026-06-10	Schreiner James Alan	EVP & COO	Sell	781	$317.42	$247,905	22,701
2026-06-05	McCarthy Michelle M	VP & Chief Accounting Officer	Sell	2,434	$315.23	$767,270	1
2026-06-01	Donlan Renee Martel	EVP, GC & CCO	Other	9,471	—	—	9,471
2026-06-01	Donlan Renee Martel	EVP, GC & CCO	Other	0	—	—	0
2026-06-01	Donlan Renee Martel	EVP, GC & CCO	Other	0	—	—	0
2026-06-01	Donlan Renee Martel	EVP, GC & CCO	Other	0	—	—	0
2026-06-01	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Sell	6,000	$314.43	$1,886,583	10,421
2026-06-01	Mora Elizabeth	Director	Sell	300	$318.02	$95,406	19,145
2026-05-27	Donahue Joseph B	Director	Sell	2,100	$327.95	$688,703	10,032
2026-05-27	COLELLA GERALD G	Director	Sell	4,876	$332.04	$1,619,034	26,467
2026-05-27	COLELLA GERALD G	Director	Sell	213	$337.05	$71,792	22,817
2026-05-27	COLELLA GERALD G	Director	Other	8,998	—	—	8,998
2026-05-27	COLELLA GERALD G	Director	Sell	1,811	$335.46	$607,514	24,656
2026-05-27	COLELLA GERALD G	Director	Sell	8,210	$331.45	$2,721,195	31,343
2026-05-27	COLELLA GERALD G	Director	Sell	2,800	$338.58	$948,024	20,017
2026-05-27	COLELLA GERALD G	Director	Sell	464	$330.38	$153,298	39,553
2026-05-27	COLELLA GERALD G	Director	Sell	1,626	$336.54	$547,219	23,030
2026-05-26	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Sell	2,500	$330.50	$826,250	16,341
2026-05-22	Mayampurath Ramakumar	SVP, CFO, Treasurer	Sell	8,810	$315.48	$2,779,379	1
2026-05-22	Lee John Tseng-Chung	Director, President & CEO	Sell	10,000	$315.48	$3,154,800	144,696
2026-05-18	CANNONE PETER III	Director	Sell	1,350	$303.40	$409,590	7,794
2026-05-14	Moloney Jacqueline F	Director	Sell	1,000	$312.20	$312,197	8,775
2026-05-13	Moloney Jacqueline F	Director	Sell	1,400	$318.99	$446,586	9,775
2026-05-11	Burke Kathleen Flaherty	EVP, GC & Secretary	Sell	4,355	$319.94	$1,393,317	49,439
2026-05-11	Taranto Eric Robert	EVP & GM, VSD	Sell	2,848	$319.93	$911,161	12,596
2026-05-11	CANNONE PETER III	Director	Award	781	—	—	9,144
2026-05-11	COLELLA GERALD G	Director	Award	781	—	—	8,998
2026-05-11	JABRE WISSAM G	Director	Award	781	—	—	5,269
2026-05-11	COLELLA GERALD G	Director	Other	40,017	—	—	40,017
2026-05-11	Mora Elizabeth	Director	Award	781	—	—	19,445
2026-05-11	Donahue Joseph B	Director	Award	781	—	—	12,132
2026-05-11	Moloney Jacqueline F	Director	Award	781	—	—	11,175
2026-05-11	Batra Raj	Director	Award	781	—	—	16,227
2026-04-17	Williams John Edward	EVP & GM, PSD	Convert	1,740	—	—	6,812
2026-04-17	Williams John Edward	EVP & GM, PSD	Convert	1,740	—	—	5,380
2026-04-17	Williams John Edward	EVP & GM, PSD	Tax	825	$269.89	$222,659	4,554
2026-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Convert	1,107	—	—	9,124
2026-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Tax	1,375	$274.15	$376,956	2,435
2026-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Convert	1,107	—	—	2,075
2026-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Award	1,672	—	—	11,199
2026-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Convert	1,736	—	—	7,388
2026-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Convert	968	—	—	10,231
2026-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Convert	968	—	—	968
2026-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Convert	1,736	—	—	3,811
2026-03-12	Moloney Jacqueline F	Director	Sell	340	$213.77	$72,682	10,393
2026-03-06	Taranto Eric Robert	EVP & GM, VSD	Sell	4,567	$220.52	$1,007,124	15,444
2026-03-02	Mora Elizabeth	Director	Sell	300	$239.44	$71,832	18,663
2026-02-24	Schreiner James Alan	EVP & COO	Sell	4,100	$255.00	$1,045,500	23,401
2026-02-24	COLELLA GERALD G	Director	Sell	10,000	$253.97	$2,539,675	40,017
2026-02-20	Lee John Tseng-Chung	Director, President & CEO	Sell	12,812	$256.93	$3,291,804	158,574

Showing 1–50 of 1,000 transactions