SEC Form 4 · Updated Daily
MKSI
— MKS, INCORPORATED. OwnershipInsider 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.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| CG Subsidiary Holdings L.L.C. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| Carlyle Holdings II GP L.L.C. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| Carlyle Group L.P. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| TC Group Cayman Investment Holdings Sub L.P. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| TC Group Cayman Investment Holdings, L.P. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| Carlyle Holdings II L.P. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| Gamma Holding Co Ltd | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| CAP IV, L.L.C. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| CAP IV General Partner, L.P. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| CEP IV Managing GP Holdings, Ltd. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| Carlyle Asia Partners IV, L.P. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| CEP IV Managing GP, L.P. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| CEP IV Participations, S.a r.l. SICAR | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| Carlyle Partners VI Cayman Holdings, L.P. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| TC Group VI Cayman, L.L.C. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| TC Group VI Cayman, L.P. | 10%+ Owner | 6,482,732 | 2023-05-08 | S |
| ASTEC AMERICA INC | 10%+ Owner | 5,372,405 | 2006-07-05 | S |
| EMERSON ELECTRIC CO | 10%+ Owner · Director | 3,646,249 | 2006-09-19 | S |
| BERTUCCI CLAIRE R | Reporting Owner | 1,965,206 | 2008-05-01 | S |
| BERLINGHIERI LEO | Director | 200,851.29 | 2013-12-30 | M |
| Lee John Tseng-Chung | Director | 134,776.267 | 2026-08-14 | S |
| BERTUCCI JOHN R | Director | 67,275.43 | 2019-05-08 | A |
| Burke Kathleen Flaherty | Officer | 49,439.485 | 2026-05-11 | S |
| COLELLA GERARD G | Officer | 39,553 | 2026-05-27 | S |
| Schneider Frank | Officer | 30,412.28 | 2007-08-23 | F |
| Amon Cristina | Director | 29,282.82 | 2015-12-16 | S |
| Schreiner James Alan | Officer | 20,230.121 | 2026-06-12 | S |
| STEWART WILLIAM D | Officer | 18,878.33 | 2012-04-02 | M |
| Mora Elizabeth | Director | 18,845.353 | 2026-09-01 | S |
| Gitin Mark Milton | Director · Officer | 18,685.79 | 2024-02-15 | M |
| Quirk Brian Charles | Officer | 17,640.59 | 2018-05-07 | S |
| Eyerman Paul | Officer | 17,375.15 | 2013-11-29 | P |
| KLIMM ROBERT L | Officer | 16,250.38 | 2007-04-26 | M |
| Batra Raj | Director | 16,227.298 | 2026-05-11 | A |
| KAHL HANS JOCHEN | Director | 16,000 | 2011-05-02 | A |
| Hadar Ron | Officer | 14,915.39 | 2007-06-06 | M |
| BAGSHAW SETH H | Officer | 12,612.79 | 2024-02-22 | S |
| Taranto Eric Robert | Officer | 12,596.239 | 2026-05-11 | S |
| WEIGNER RONALD | Officer | 12,024.34 | 2009-03-10 | M |
| VALENTE LOUIS P | Director | 12,000 | 2012-02-06 | S |
| Warner Michelle M | Director | 10,851.84 | 2024-05-07 | A |
| Henry David Philip | Officer | 10,421.527 | 2026-06-01 | S |
| Abrams John R | Officer | 10,110.6 | 2019-02-15 | M |
| Donahue Joseph B | Director | 10,032.704 | 2026-05-27 | S |
| Donlan Renee Martel | Officer | 9,471.71 | 2026-06-01 | — |
| ANDERSON ROBERT R | Director | 9,295.82 | 2017-05-08 | G |
| SMITH JOHN ALEXANDER | Officer | 8,802.85 | 2013-07-03 | M |
| Moloney Jacqueline F | Director | 8,775.156 | 2026-05-14 | S |
| ROBBINS OWEN W | Director | 8,592 | 2006-03-02 | M |
| CANNONE PETER III | Officer | 7,794.039 | 2026-05-18 | S |
| PHILLIPPY ROBERT J | Director | 7,354.93 | 2018-02-15 | S |
| CHUTE RICHARD S | Director | 6,616.22 | 2019-05-08 | S |
| Loomis Paul | Officer | 6,531.21 | 2013-05-30 | S |
| Hess Rick D | Director | 5,468.36 | 2019-05-08 | A |
| JABRE WISSAM G | Officer | 5,269.935 | 2026-05-11 | A |
| Williams John Edward | Officer | 4,097.844 | 2026-08-03 | S |
| Werth Dennis L | Officer | 2,456 | 2018-04-02 | M |
| HENRY JANICE K | Director | 1,988.67 | 2020-05-11 | A |
| Beecher Gregory R | Director | 1,980.65 | 2020-05-05 | S |
| WILD GEOFFREY | Director | 1,813.24 | 2022-08-17 | A |
| HANLEY PETER | Director | 1,501.22 | 2018-08-07 | S |
| McCarthy Michelle M | Officer | 1.549 | 2026-06-05 | S |
| Mayampurath Ramakumar | Officer | 1.139 | 2026-05-22 | S |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-09-01 | Mora Elizabeth | Open-market sale | 300 | $250.96 | 18,845.353 |
| 2026-08-17 | Donlan Renee Martel | Grant / award (derivative) | 954.044 | — | 4,780.571 |
| 2026-08-14 | Lee John Tseng-Chung | Open-market sale | 10,000 | $302.01 | 134,776.267 |
| 2026-08-03 | Williams John Edward | Open-market sale | 457 | $288.31 | 4,097.844 |
| 2026-06-12 | Schreiner James Alan | Open-market sale | 217 | $347.00 | 19,201.121 |
| 2026-06-12 | Schreiner James Alan | Open-market sale | 812 | $346.41 | 19,418.121 |
| 2026-06-12 | Schreiner James Alan | Open-market sale | 2,471 | $345.52 | 20,230.121 |
| 2026-06-10 | Schreiner James Alan | Open-market sale | 781 | $317.42 | 22,701.121 |
| 2026-06-05 | McCarthy Michelle M | Open-market sale | 2,434 | $315.23 | 1.549 |
| 2026-06-01 | Donlan Renee Martel | — | — | — | 9,471.71 |
| 2026-06-01 | Mora Elizabeth | Open-market sale | 300 | $318.02 | 19,145.353 |
| 2026-06-01 | Henry David Philip | Open-market sale | 6,000 | $314.43 | 10,421.527 |
| 2026-05-27 | COLELLA GERARD G | Open-market sale | 2,800 | $338.58 | 20,017 |
| 2026-05-27 | COLELLA GERARD G | Open-market sale | 213 | $337.05 | 22,817 |
| 2026-05-27 | COLELLA GERARD G | Open-market sale | 1,626 | $336.54 | 23,030 |
| 2026-05-27 | COLELLA GERARD G | Open-market sale | 1,811 | $335.46 | 24,656 |
| 2026-05-27 | COLELLA GERARD G | Open-market sale | 4,876 | $332.04 | 26,467 |
| 2026-05-27 | COLELLA GERARD G | Open-market sale | 8,210 | $331.45 | 31,343 |
| 2026-05-27 | COLELLA GERARD G | Open-market sale | 464 | $330.38 | 39,553 |
| 2026-05-27 | Donahue Joseph B | Open-market sale | 2,100 | $327.95 | 10,032.704 |
| 2026-05-26 | Henry David Philip | Open-market sale | 2,500 | $330.50 | 16,341.368 |
| 2026-05-22 | Lee John Tseng-Chung | Open-market sale | 10,000 | $315.48 | 144,696.108 |
| 2026-05-22 | Mayampurath Ramakumar | Open-market sale | 8,810 | $315.48 | 1.139 |
| 2026-05-18 | CANNONE PETER III | Open-market sale | 1,350 | $303.40 | 7,794.039 |
| 2026-05-14 | Moloney Jacqueline F | Open-market sale | 1,000 | $312.20 | 8,775.156 |
| 2026-05-13 | Moloney Jacqueline F | Open-market sale | 1,400 | $318.99 | 9,775.156 |
| 2026-05-11 | COLELLA GERARD G | Grant / award | 781.959 | — | 8,998.886 |
| 2026-05-11 | Batra Raj | Grant / award | 781.959 | — | 16,227.298 |
| 2026-05-11 | CANNONE PETER III | Grant / award | 781.959 | — | 9,144.039 |
| 2026-05-11 | Donahue Joseph B | Grant / award | 781.959 | — | 12,132.704 |
| 2026-05-11 | Burke Kathleen Flaherty | Open-market sale | 4,355 | $319.94 | 49,439.485 |
| 2026-05-11 | Mora Elizabeth | Grant / award | 781.959 | — | 19,445.353 |
| 2026-05-11 | JABRE WISSAM G | Grant / award | 781.959 | — | 5,269.935 |
| 2026-05-11 | Moloney Jacqueline F | Grant / award | 781.959 | — | 11,175.156 |
| 2026-05-11 | Taranto Eric Robert | Open-market sale | 2,848.522 | $319.93 | 12,596.239 |
| 2026-04-17 | Williams John Edward | Option exercise (derivative) | 1,740.714 | — | 6,812.003 |
| 2026-04-17 | Williams John Edward | Tax withholding | 825.969 | $269.89 | 4,554.844 |
| 2026-04-17 | Williams John Edward | Option exercise | 1,740.714 | — | 5,380.813 |
| 2026-04-15 | McCarthy Michelle M | Option exercise (derivative) | 1,736 | — | 7,388.16 |
| 2026-04-15 | McCarthy Michelle M | Option exercise (derivative) | 1,107 | — | 9,124.16 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.