MKSI
MKS Inc.
NASDAQ · Technology · Hardware, Equipment & Parts · US
$260.13
+4.20%0
Insider buys (3m)
8
Insider sells (3m)
-$5.5M
Net value (3m)
-14.0%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| Sep 2, 2026 | Mora Elizabeth · director | Sale | 300 | $251 |
| Aug 18, 2026 | Donlan Renee Martel · officer: EVP, GC & CCO | A-Award | 954 | $0.00 |
| Aug 17, 2026 | Lee John Tseng-Chung · director, officer: President & CEO | Sale | 10,000 | $302 |
| Aug 4, 2026 | Williams John Edward · officer: EVP & GM, PSD | Sale | 457 | $288 |
| Jun 16, 2026 | Schreiner James Alan · officer: EVP & COO | Sale | 217 | $347 |
| Jun 16, 2026 | Schreiner James Alan · officer: EVP & COO | Sale | 2,471 | $346 |
| Jun 16, 2026 | Schreiner James Alan · officer: EVP & COO | Sale | 812 | $346 |
| Jun 11, 2026 | Schreiner James Alan · officer: EVP & COO | Sale | 781 | $317 |
| Jun 8, 2026 | McCarthy Michelle M · officer: SVP & Chief Accounting Officer | Sale | 2,434 | $315 |
| Jun 2, 2026 | Henry David Philip · officer: EVP, Global Str Mktg & GM, MSD | Sale | 6,000 | $314 |
| Jun 2, 2026 | Mora Elizabeth · director | Sale | 300 | $318 |
| May 28, 2026 | COLELLA GERALD G · director | Sale | 4,876 | $332 |
| May 28, 2026 | Donahue Joseph B · director | Sale | 2,100 | $328 |
| May 28, 2026 | COLELLA GERALD G · director | Sale | 213 | $337 |
| May 28, 2026 | COLELLA GERALD G · director | Sale | 1,626 | $337 |
| May 28, 2026 | COLELLA GERALD G · director | Sale | 1,811 | $335 |
| May 28, 2026 | COLELLA GERALD G · director | Sale | 8,210 | $331 |
| May 28, 2026 | COLELLA GERALD G · director | Sale | 2,800 | $339 |
| May 28, 2026 | COLELLA GERALD G · director | Sale | 464 | $330 |
| May 27, 2026 | Henry David Philip · officer: EVP, Global Str Mktg & GM, MSD | Sale | 2,500 | $331 |
| May 26, 2026 | Lee John Tseng-Chung · director, officer: President & CEO | Sale | 10,000 | $315 |
| May 26, 2026 | Mayampurath Ramakumar · officer: EVP & CFO | Sale | 8,810 | $315 |
| May 19, 2026 | CANNONE PETER III · director | Sale | 1,350 | $303 |
| May 15, 2026 | Moloney Jacqueline F · director | Sale | 1,000 | $312 |
| May 14, 2026 | Moloney Jacqueline F · director | Sale | 1,400 | $319 |
| May 12, 2026 | COLELLA GERALD G · director | A-Award | 782 | $0.00 |
| May 12, 2026 | Donahue Joseph B · director | A-Award | 782 | $0.00 |
| May 12, 2026 | JABRE WISSAM G · director | A-Award | 782 | $0.00 |
| May 12, 2026 | Moloney Jacqueline F · director | A-Award | 782 | $0.00 |
| May 12, 2026 | Batra Raj · director | A-Award | 782 | $0.00 |
Institutional positioning
13F filings over the trailing two quarters
New 377Increased 451Reduced 450Sold out 53
| Filer | Action | Shares | Filed |
|---|---|---|---|
| BlackRock, Inc. | Increased | 6,930,030 | Aug 7, 2026 |
| BLACKROCK, INC. | Increased | 6,641,730 | May 13, 2026 |
| Invesco Ltd. | Increased | 4,661,664 | Aug 14, 2026 |
| INVESCO LTD. | Reduced | 3,721,459 | May 12, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 3,707,327 | Aug 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 3,685,493 | May 8, 2026 |
| JPMORGAN CHASE & CO | Increased | 3,373,844 | Aug 12, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 3,049,560 | Aug 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 3,014,201 | May 15, 2026 |
| STATE STREET CORP | Increased | 2,134,663 | Aug 7, 2026 |
| JPMORGAN CHASE & CO | Increased | 2,096,342 | May 13, 2026 |
| STATE STREET CORP | Increased | 2,057,732 | May 15, 2026 |
| Point72 Asset Management, L.P. | Increased | 2,001,343 | Aug 14, 2026 |
| CAPITAL INTERNATIONAL INVESTORS | Reduced | 1,968,770 | May 13, 2026 |
| FMR LLC | Reduced | 1,933,843 | May 15, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Sep 2, 2026