SEC Form 4 · Updated Daily

MKSI

— MKS, INCORPORATED. Ownership

Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.

FinancialsOwnership

Current Reporting Owners

OwnerRoleShares OwnedAs OfLast Activity
Lee John Tseng-ChungDirector134,776.2672026-08-14S
Burke Kathleen FlahertyOfficer49,439.4852026-05-11S
COLELLA GERALD GDirector20,0172026-05-27S
Schreiner James AlanOfficer19,201.1212026-06-12S
Mora ElizabethDirector18,845.3532026-09-01S
Batra RajDirector16,227.2982026-05-11A
Taranto Eric RobertOfficer12,596.2392026-05-11S
Henry David PhilipOfficer10,421.5272026-06-01S
Donahue Joseph BDirector10,032.7042026-05-27S
Moloney Jacqueline FDirector8,775.1562026-05-14S
CANNONE PETER IIIDirector7,794.0392026-05-18S
JABRE WISSAM GDirector5,269.9352026-05-11A
Williams John EdwardOfficer4,097.8442026-08-03S
McCarthy Michelle MOfficer1.5492026-06-05S
Mayampurath RamakumarOfficer1.1392026-05-22S

Recent Filings

DateOwnerActivitySharesPriceOwned After
2026-09-01Mora ElizabethOpen-market sale300$250.9618,845.353
2026-08-17Donlan Renee MartelGrant / award (derivative)954.044—4,780.571
2026-08-14Lee John Tseng-ChungOpen-market sale10,000$302.01134,776.267
2026-08-03Williams John EdwardOpen-market sale457$288.314,097.844
2026-06-12Schreiner James AlanOpen-market sale217$347.0019,201.121
2026-06-12Schreiner James AlanOpen-market sale812$346.4119,418.121
2026-06-12Schreiner James AlanOpen-market sale2,471$345.5220,230.121
2026-06-10Schreiner James AlanOpen-market sale781$317.4222,701.121
2026-06-05McCarthy Michelle MOpen-market sale2,434$315.231.549
2026-06-01Mora ElizabethOpen-market sale300$318.0219,145.353
2026-06-01Henry David PhilipOpen-market sale6,000$314.4310,421.527
2026-05-27COLELLA GERALD GOpen-market sale2,800$338.5820,017
2026-05-27COLELLA GERALD GOpen-market sale213$337.0522,817
2026-05-27COLELLA GERALD GOpen-market sale1,626$336.5423,030
2026-05-27COLELLA GERALD GOpen-market sale1,811$335.4624,656
2026-05-27COLELLA GERALD GOpen-market sale4,876$332.0426,467
2026-05-27COLELLA GERALD GOpen-market sale8,210$331.4531,343
2026-05-27COLELLA GERALD GOpen-market sale464$330.3839,553
2026-05-27Donahue Joseph BOpen-market sale2,100$327.9510,032.704
2026-05-26Henry David PhilipOpen-market sale2,500$330.5016,341.368
2026-05-22Lee John Tseng-ChungOpen-market sale10,000$315.48144,696.108
2026-05-22Mayampurath RamakumarOpen-market sale8,810$315.481.139
2026-05-18CANNONE PETER IIIOpen-market sale1,350$303.407,794.039
2026-05-14Moloney Jacqueline FOpen-market sale1,000$312.208,775.156
2026-05-13Moloney Jacqueline FOpen-market sale1,400$318.999,775.156
2026-05-11COLELLA GERALD GGrant / award781.959—8,998.886
2026-05-11Batra RajGrant / award781.959—16,227.298
2026-05-11CANNONE PETER IIIGrant / award781.959—9,144.039
2026-05-11Donahue Joseph BGrant / award781.959—12,132.704
2026-05-11Burke Kathleen FlahertyOpen-market sale4,355$319.9449,439.485
2026-05-11Mora ElizabethGrant / award781.959—19,445.353
2026-05-11JABRE WISSAM GGrant / award781.959—5,269.935
2026-05-11Moloney Jacqueline FGrant / award781.959—11,175.156
2026-05-11Taranto Eric RobertOpen-market sale2,848.522$319.9312,596.239
2026-04-17Williams John EdwardOption exercise (derivative)1,740.714—6,812.003
2026-04-17Williams John EdwardTax withholding825.969$269.894,554.844
2026-04-17Williams John EdwardOption exercise1,740.714—5,380.813
2026-04-15McCarthy Michelle MOption exercise (derivative)1,736—7,388.16
2026-04-15McCarthy Michelle MOption exercise (derivative)1,107—9,124.16
2026-04-15McCarthy Michelle MOption exercise (derivative)968—10,231.16

Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.