Stocks
MKSI MKS INC

MKSI

MKS INC

Company with tickers: MKSI

CIK

1049502

CUSIP

55306N104

Shares Outstanding

67,321,698

Price Holdings Short Volume Short Interest Fails to Deliver SEC Filings Earnings Calls Insider Trading Congress Trades

Date	Insider	Role	Type	Shares	Price	Value	After
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	Taranto Eric Robert	EVP & GM, VSD	Sell	1,452	$247.55	$359,443	20,012
2026-02-20	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Sell	2,000	$261.56	$523,120	18,841
2026-02-20	Lee John Tseng-Chung	Director, President & CEO	Sell	13,310	$256.05	$3,408,076	171,386
2026-02-20	COLELLA GERALD G	Director	Sell	10,000	$252.90	$2,528,999	50,017
2026-02-20	COLELLA GERALD G	Director	Other	8,216	—	—	8,216
2026-02-20	CANNONE PETER III	Director	Sell	1,250	$258.06	$322,575	8,362
2026-02-20	Moloney Jacqueline F	Director	Sell	829	$247.55	$205,219	10,733
2026-02-20	Williams John Edward	EVP & GM, PSD	Sell	2,042	$256.41	$523,584	3,640
2026-02-20	Burke Kathleen Flaherty	EVP, GC & Secretary	Sell	4,254	$250.00	$1,063,500	53,794
2026-02-20	McCarthy Michelle M	VP & Chief Accounting Officer	Sell	650	$249.57	$162,219	816
2026-02-17	Williams John Edward	EVP & GM, PSD	Convert	300	—	—	11,490
2026-02-17	Williams John Edward	EVP & GM, PSD	Award	1,473	—	—	11,790
2026-02-17	Williams John Edward	EVP & GM, PSD	Tax	1,195	$260.74	$311,584	5,682
2026-02-17	Williams John Edward	EVP & GM, PSD	Convert	300	—	—	3,940
2026-02-17	Mayampurath Ramakumar	SVP, CFO, Treasurer	Convert	2,958	—	—	26,600
2026-02-17	Mayampurath Ramakumar	SVP, CFO, Treasurer	Tax	2,515	$260.74	$655,761	8,811
2026-02-17	Mayampurath Ramakumar	SVP, CFO, Treasurer	Award	4,278	—	—	29,558
2026-02-17	Mayampurath Ramakumar	SVP, CFO, Treasurer	Convert	2,958	—	—	8,625
2026-02-17	Burke Kathleen Flaherty	EVP, GC & Secretary	Tax	5,317	$260.74	$1,386,355	58,048
2026-02-17	Burke Kathleen Flaherty	EVP, GC & Secretary	Convert	3,450	—	—	23,884
2026-02-17	Burke Kathleen Flaherty	EVP, GC & Secretary	Award	3,327	—	—	27,335
2026-02-17	Burke Kathleen Flaherty	EVP, GC & Secretary	Convert	3,450	—	—	54,611
2026-02-17	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Convert	2,405	—	—	18,969
2026-02-17	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Convert	2,405	—	—	18,062
2026-02-17	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Award	2,567	—	—	21,375
2026-02-17	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Tax	4,097	$260.74	$1,068,252	20,841
2026-02-17	Schreiner James Alan	EVP & COO	Tax	4,343	$260.74	$1,132,394	27,501
2026-02-17	Schreiner James Alan	EVP & COO	Convert	2,566	—	—	25,187
2026-02-17	Schreiner James Alan	EVP & COO	Convert	2,566	—	—	18,055
2026-02-17	Schreiner James Alan	EVP & COO	Award	2,376	—	—	20,621
2026-02-17	Lee John Tseng-Chung	Director, President & CEO	Convert	22,088	—	—	132,629
2026-02-17	Lee John Tseng-Chung	Director, President & CEO	Award	15,592	—	—	154,717
2026-02-17	Lee John Tseng-Chung	Director, President & CEO	Tax	32,548	$260.74	$8,486,566	184,696
2026-02-17	Lee John Tseng-Chung	Director, President & CEO	Convert	22,088	—	—	169,443
2026-02-17	Taranto Eric Robert	EVP & GM, VSD	Convert	1,764	—	—	12,737
2026-02-17	Taranto Eric Robert	EVP & GM, VSD	Convert	1,764	—	—	19,468
2026-02-17	Taranto Eric Robert	EVP & GM, VSD	Tax	2,711	$260.74	$706,866	21,465
2026-02-17	Taranto Eric Robert	EVP & GM, VSD	Award	1,758	—	—	14,501
2026-02-08	Taranto Eric Robert	EVP & GM, VSD	Award	3,504	—	—	12,742
2026-02-08	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Award	5,521	—	—	18,808
2026-02-08	Schreiner James Alan	EVP & COO	Award	5,226	—	—	18,244
2026-02-08	Burke Kathleen Flaherty	EVP, GC & Secretary	Award	7,008	—	—	24,007
2026-02-08	Mayampurath Ramakumar	SVP, CFO, Treasurer	Award	8,877	—	—	25,279
2026-02-08	Lee John Tseng-Chung	Director, President & CEO	Award	50,971	—	—	139,124
2026-02-08	Williams John Edward	EVP & GM, PSD	Award	2,973	—	—	10,317
2025-12-02	Mora Elizabeth	Director	Sell	300	$158.81	$47,643	18,963
2025-11-17	Mayampurath Ramakumar	SVP, CFO, Treasurer	Convert	8,295	—	—	16,402
2025-11-17	Mayampurath Ramakumar	SVP, CFO, Treasurer	Tax	2,628	$142.74	$375,121	5,667
2025-11-17	Mayampurath Ramakumar	SVP, CFO, Treasurer	Convert	8,295	—	—	8,295
2025-10-31	Lee John Tseng-Chung	Director, President & CEO	Convert	352	—	—	147,621
2025-10-31	Lee John Tseng-Chung	Director, President & CEO	Convert	352	—	—	89,803
2025-10-31	Lee John Tseng-Chung	Director, President & CEO	Tax	2,003	$143.71	$287,851	147,269
2025-10-31	Burke Kathleen Flaherty	EVP, GC & Secretary	Convert	158	—	—	51,232
2025-10-31	Burke Kathleen Flaherty	EVP, GC & Secretary	Convert	158	—	—	17,617
2025-10-31	Burke Kathleen Flaherty	EVP, GC & Secretary	Tax	777	$143.71	$111,663	51,074
2025-10-22	Schreiner James Alan	EVP & COO	Sell	711	$138.68	$98,601	22,534
2025-10-01	Moloney Jacqueline F	Director	Sell	300	$122.14	$36,642	11,562
2025-09-18	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Sell	5,000	$130.00	$650,000	15,571
2025-09-18	Schreiner James Alan	EVP & COO	Sell	838	$124.00	$103,912	23,245
2025-09-02	Mora Elizabeth	Director	Sell	300	$99.85	$29,955	19,263
2025-08-18	Schreiner James Alan	EVP & COO	Convert	2,640	—	—	25,332
2025-08-18	Schreiner James Alan	EVP & COO	Convert	2,640	—	—	13,018
2025-08-18	Schreiner James Alan	EVP & COO	Tax	1,249	$100.22	$125,175	24,083
2025-08-15	Williams John Edward	EVP & GM, PSD	Tax	308	$104.73	$32,257	3,640
2025-08-15	Williams John Edward	EVP & GM, PSD	Convert	947	—	—	7,343
2025-08-15	Williams John Edward	EVP & GM, PSD	Convert	947	—	—	3,948
2025-08-04	Schreiner James Alan	EVP & COO	Award	1,329	—	—	15,659
2025-08-01	Moloney Jacqueline F	Director	Sell	300	$92.10	$27,630	11,862
2025-07-07	Schreiner James Alan	EVP & COO	Sell	957	$102.44	$98,035	22,691
2025-07-03	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Sell	2,000	$105.00	$210,000	20,571
2025-06-02	Mora Elizabeth	Director	Sell	300	$81.78	$24,534	19,563
2025-05-12	Mora Elizabeth	Director	Award	2,479	—	—	19,863
2025-05-12	CANNONE PETER III	Director	Award	2,479	—	—	9,612
2025-05-12	Batra Raj	Director	Award	2,479	—	—	15,445
2025-05-12	Moloney Jacqueline F	Director	Award	2,479	—	—	12,162
2025-05-12	JABRE WISSAM G	Director	Award	2,479	—	—	4,487
2025-05-12	Donahue Joseph B	Director	Award	2,479	—	—	11,350
2025-05-12	COLELLA GERALD G	Director	Award	2,479	—	—	8,216
2025-05-12	COLELLA GERALD G	Director	Other	60,017	—	—	60,017
2025-04-17	Williams John Edward	EVP & GM, PSD	Convert	1,740	—	—	3,565
2025-04-17	Williams John Edward	EVP & GM, PSD	Tax	565	$63.69	$35,985	3,000
2025-04-17	Williams John Edward	EVP & GM, PSD	Convert	1,740	—	—	8,291
2025-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Convert	968	—	—	5,422
2025-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Award	5,209	—	—	9,526
2025-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Convert	968	—	—	968
2025-04-15	McCarthy Michelle M	VP & Chief Accounting Officer	Tax	608	$68.48	$41,636	1,466
2025-03-03	Mora Elizabeth	Director	Sell	275	$92.46	$25,427	17,384
2025-03-03	Moloney Jacqueline F	Director	Sell	300	$92.46	$27,738	9,682
2025-02-18	Mayampurath Ramakumar	SVP, CFO, Treasurer	Award	8,106	—	—	24,697
2025-02-18	Burke Kathleen Flaherty	EVP, GC & Secretary	Award	7,822	—	—	29,421
2025-02-18	Burke Kathleen Flaherty	EVP, GC & Secretary	Convert	2,286	—	—	45,533
2025-02-18	Burke Kathleen Flaherty	EVP, GC & Secretary	Tax	3,970	$103.67	$411,570	50,922
2025-02-18	Burke Kathleen Flaherty	EVP, GC & Secretary	Convert	2,286	—	—	27,134
2025-02-18	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Tax	2,372	$103.67	$245,905	22,419
2025-02-18	Henry David Philip	EVP, Global Str Mktg & GM, MSD	Convert	1,528	—	—	18,305