| $255M | ||
| $48M | ||
| $38M | ||
| $37M | ||
| $34M | ||
| $34M |
Buys | $0 | 0 | 0 |
Sells | $50,618,506 | 34 | 100 |
| Mora Elizabeth | director | 0 | $0 | 4 | $290,169 | $-290,169 |
| Williams John Edward | EVP & GM, PSD | 0 | $0 | 2 | $655,502 | $-655,502 |
| Donahue Joseph B | director | 0 | $0 | 1 | $688,703 | $-688,703 |
| CANNONE PETER III | director | 0 | $0 | 2 | $732,165 | $-732,165 |
| Moloney Jacqueline F | director | 0 | $0 | 4 | $1.04M | $-1.04M |
| McCarthy Michelle M | VP & Chief Accounting Officer | 0 | $0 | 2 | $1.13M | $-1.13M |
| Taranto Eric Robert | EVP & GM, VSD | 0 | $0 | 3 | $2.28M | $-2.28M |
| Burke Kathleen Flaherty | EVP, GC & Secretary | 0 | $0 | 2 | $2.46M | $-2.46M |
| Schreiner James Alan | EVP & COO | 0 | $0 | 3 | $2.5M | $-2.5M |
| Mayampurath Ramakumar | EVP & CFO | 0 | $0 | 1 | $2.78M | $-2.78M |
| Henry David Philip | EVP, Global Str Mktg & GM, MSD | 0 | $0 | 3 | $3.24M | $-3.24M |
| COLELLA GERALD G | director | 0 | $0 | 3 | $11.74M | $-11.74M |
| Lee John Tseng-Chung | President & CEO | 0 | $0 | 4 | $21.09M | $-21.09M |
MKS Inc. (MKSI) functions as a worldwide supplier of sophisticated instruments, integrated systems, specialized components, and advanced process control solutions. The company's products are engineered to precisely measure, observe, deliver, evaluate, energize, and regulate essential operational factors within diverse manufacturing environments across the globe. Its offerings are categorized into three primary divisions: 1. Vacuum & Analysis: This segment provides cutting-edge solutions for managing pressure and vacuum, featuring both direct …
Over the last 12 months, insiders at MKS Inc. have bought $0 and sold $50.62M worth of MKS Inc. stock.
On average, over the past 5 years, insiders at MKS Inc. have bought $159,193 and sold $82.14M worth of stock each year.
There was no buying activity among insiders over the last 12 months.
The last purchase of 2,500 shares for transaction amount of $170,862 was made by Henry David Philip (EVP, Operations & Corp Mktg) on 2023‑11‑07.
| 2026-09-01 | Sale | Mora Elizabeth | director | 300 0.0005% | $250.96 | $75,288 | +1.71% | |
| 2026-08-14 | Sale | Lee John Tseng-Chung | President & CEO | 10,000 0.0144% | $302.01 | $3.02M | -17.07% | |
| 2026-08-03 | Sale | Williams John Edward | EVP & GM, PSD | 457 0.0006% | $288.31 | $131,758 | -15.92% | |
| 2026-06-12 | Sale | Schreiner James Alan | EVP & COO | 3,500 0.005% | $345.82 | $1.21M | -21.53% | |
| 2026-06-10 | Sale | Schreiner James Alan | EVP & COO | 781 0.0012% | $317.42 | $247,905 | -11.60% | |
| 2026-06-05 | Sale | McCarthy Michelle M | SVP & Chief Accounting Officer | 2,434 0.0038% | $315.23 | $767,270 | -6.79% | |
| 2026-06-01 | Sale | Mora Elizabeth | director | 300 0.0004% | $318.02 | $95,406 | -11.22% | |
| 2026-06-01 | Sale | Henry David Philip | EVP, Global Str Mktg & GM, MSD | 6,000 0.0088% | $314.43 | $1.89M | -11.22% | |
| 2026-05-27 | Sale | COLELLA GERALD G | director | 20,000 0.0301% | $333.40 | $6.67M | -12.95% | |
| 2026-05-27 | Sale | Donahue Joseph B | director | 2,100 0.0031% | $327.95 | $688,703 | -12.95% | |
| 2026-05-26 | Sale | Henry David Philip | EVP, Global Str Mktg & GM, MSD | 2,500 0.0037% | $330.50 | $826,250 | -13.64% | |
| 2026-05-22 | Sale | Lee John Tseng-Chung | President & CEO | 10,000 0.0146% | $315.48 | $3.15M | -9.07% | |
| 2026-05-22 | Sale | Mayampurath Ramakumar | EVP & CFO | 8,810 0.0128% | $315.48 | $2.78M | -9.07% | |
| 2026-05-18 | Sale | CANNONE PETER III | director | 1,350 0.0021% | $303.40 | $409,590 | -0.74% | |
| 2026-05-14 | Sale | Moloney Jacqueline F | director | 1,000 0.0015% | $312.20 | $312,197 | -6.30% | |
| 2026-05-13 | Sale | Moloney Jacqueline F | director | 1,400 0.0021% | $318.99 | $446,586 | -7.24% | |
| 2026-05-11 | Sale | Burke Kathleen Flaherty | EVP, GC & Secretary | 4,355 0.0065% | $319.94 | $1.39M | -7.68% | |
| 2026-05-11 | Sale | Taranto Eric Robert | EVP & GM, VSD | 2,848.52 0.0042% | $319.93 | $911,328 | -7.68% | |
| 2026-03-12 | Sale | Moloney Jacqueline F | director | 340.11 0.0005% | $213.77 | $72,705 | +30.98% | |
| 2026-03-06 | Sale | Taranto Eric Robert | EVP & GM, VSD | 4,567.88 0.0071% | $220.52 | $1.01M | +33.01% |
| Lee John Tseng-Chung | President & CEO | 134776 0.1993% | $27.65M | 3 | 24 | +6.41% |
| COLELLA GERALD G | director | 20017 0.0296% | $4.11M | 1 | 65 | <0.0001% |
| Henry David Philip | EVP, Global Str Mktg & GM, MSD | 10422 0.0154% | $2.14M | 1 | 6 | +69.94% |
| CANNONE PETER III | director | 7794 0.0115% | $1.6M | 1 | 2 | <0.0001% |
| Eyerman Paul | VP & GM, ENI and Medical | 17375 0.0257% | $3.57M | 3 | 0 | +6.41% |
| ANDERSON ROBERT R | director | 11296 0.0167% | $2.32M | 1 | 34 | +40.61% |
| BAGSHAW SETH H | EVP, CFO & Treasurer | 1 0% | $161.68 | 3 | 32 | +6.41% |
| Increased Positions | 315 | +71.27% | 9M | +12.95% |
| Decreased Positions | 190 | -42.99% | 11M | -14.99% |
| New Positions | 132 | New | 3M | New |
| Sold Out Positions | 45 | Sold Out | 1M | Sold Out |
| Total Postitions | 567 | +28.28% | 71M | -2.04% |
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| Capital International Investors | $547,955.00 | 4.86% | 3.25M | +2,077 | +0.06% | 2025-09-30 |
| Wellington Management Group Llp | $507,403.00 | 4.5% | 3.01M | +14,341 | +0.48% | 2025-09-30 |
| Invesco Ltd. | $401,264.00 | 3.56% | 2.38M | +446,822 | +23.07% | 2025-09-30 |
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| Neuberger Berman Group Llc | $275,234.00 | 2.44% | 1.63M | -253,825 | -13.44% | 2025-09-30 |