MKSI MKS INC
Nasdaq · SEC CIK 1049502 · EDGAR
- Bought, last 12 months
- $0 0 purchases by 0 insiders
- Sold, last 12 months
- $43.54M 34 sales by 13 insiders
- Filings on record
- 236 since 2021-09-02, latest 2026-09-02 12:34
BoughtSold
Most active insiders, 12 months
| Insider | Title | Bought | Sold |
|---|---|---|---|
| Lee John Tseng-Chung | Pres, CEO, Dir | — | $13.88M |
| COLELLA GERALD G | Dir | — | $11.74M |
| Henry David Philip | EVP, Gbl Str Mktg, GM, MSD | — | $3.24M |
| Mayampurath Ramakumar | EVP, CFO | — | $2.78M |
| Schreiner James Alan | EVP, COO | — | $2.60M |
| Burke Kathleen Flaherty | EVP, GC, Sec | — | $2.46M |
| Taranto Eric Robert | EVP, GM, VSD | — | $2.28M |
| McCarthy Michelle M | VP, CAO | — | $1.13M |
| Moloney Jacqueline F | Dir | — | $1.07M |
| CANNONE PETER III | Dir | — | $732.2K |
Transactions 248
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| T | 2026-09-02 12:34 | 2026-09-01 | MKSI | Mora Elizabeth | Dir | S - Sale | $250.96 | -300 | 18.8K | -2% | -$75.3K |
| T | 2026-08-17 10:11 | 2026-08-14 | MKSI | Lee John Tseng-Chung | Pres, CEO, Dir | S - Sale | $302.01 | -10.0K | 134.8K | -7% | -$3.02M |
| T | 2026-08-04 12:21 | 2026-08-03 | MKSI | Williams John Edward | EVP, GM, PSD | S - Sale | $288.31 | -457 | 4,098 | -10% | -$131.8K |
| M | 2026-06-16 17:35 | 2026-06-12 | MKSI | Schreiner James Alan | EVP, COO | S - Sale | $345.82 | -3,500 | 19.2K | -15% | -$1.21M |
| T | 2026-06-11 10:40 | 2026-06-10 | MKSI | Schreiner James Alan | EVP, COO | S - Sale | $317.42 | -781 | 22.7K | -3% | -$247.9K |
| T | 2026-06-08 10:53 | 2026-06-05 | MKSI | McCarthy Michelle M | SVP, CAO | S - Sale | $315.23 | -2,434 | 1.55 | -100% | -$767.3K |
| 2026-06-02 15:13 | 2026-06-01 | MKSI | Henry David Philip | EVP, Gbl Str Mktg, GM, MSD | S - Sale | $314.43 | -6,000 | 10.4K | -37% | -$1.89M | |
| T | 2026-06-02 15:08 | 2026-06-01 | MKSI | Mora Elizabeth | Dir | S - Sale | $318.02 | -300 | 19.1K | -2% | -$95.4K |
| 2026-05-28 14:07 | 2026-05-27 | MKSI | Donahue Joseph B | Dir | S - Sale | $327.95 | -2,100 | 10.0K | -17% | -$688.7K | |
| MTI | 2026-05-28 14:04 | 2026-05-27 | MKSI | COLELLA GERALD G | Dir | S - Sale | $333.40 | -20.0K | 20.0K | -50% | -$6.67M |
| T | 2026-05-27 17:07 | 2026-05-26 | MKSI | Henry David Philip | EVP, Gbl Str Mktg, GM, MSD | S - Sale | $330.50 | -2,500 | 16.3K | -13% | -$826.2K |
| T | 2026-05-26 14:18 | 2026-05-22 | MKSI | Mayampurath Ramakumar | EVP, CFO | S - Sale | $315.48 | -8,810 | 1.14 | -100% | -$2.78M |
| T | 2026-05-26 14:15 | 2026-05-22 | MKSI | Lee John Tseng-Chung | Pres, CEO, Dir | S - Sale | $315.48 | -10.0K | 144.7K | -6% | -$3.15M |
| 2026-05-19 10:46 | 2026-05-18 | MKSI | CANNONE PETER III | Dir | S - Sale | $303.40 | -1,350 | 7,794 | -15% | -$409.6K | |
| 2026-05-15 10:04 | 2026-05-14 | MKSI | Moloney Jacqueline F | Dir | S - Sale | $312.20 | -1,000 | 8,775 | -10% | -$312.2K | |
| 2026-05-14 11:12 | 2026-05-13 | MKSI | Moloney Jacqueline F | Dir | S - Sale | $318.99 | -1,400 | 9,775 | -13% | -$446.6K | |
| 2026-05-12 15:19 | 2026-05-11 | MKSI | Taranto Eric Robert | EVP, GM, VSD | S - Sale | $319.93 | -2,849 | 12.6K | -18% | -$911.3K | |
| 2026-05-12 15:17 | 2026-05-11 | MKSI | Moloney Jacqueline F | Dir | A - Grant | — | +781.96 | 11.2K | +8% | — | |
| 2026-05-12 15:15 | 2026-05-11 | MKSI | JABRE WISSAM G | Dir | A - Grant | — | +781.96 | 5,270 | +17% | — | |
| 2026-05-12 15:13 | 2026-05-11 | MKSI | Mora Elizabeth | Dir | A - Grant | — | +781.96 | 19.4K | +4% | — | |
| 2026-05-12 15:09 | 2026-05-11 | MKSI | Burke Kathleen Flaherty | EVP, GC, Sec | S - Sale | $319.94 | -4,355 | 49.4K | -8% | -$1.39M | |
| 2026-05-12 15:07 | 2026-05-11 | MKSI | Donahue Joseph B | Dir | A - Grant | — | +781.96 | 12.1K | +7% | — | |
| 2026-05-12 15:04 | 2026-05-11 | MKSI | CANNONE PETER III | Dir | A - Grant | — | +781.96 | 9,144 | +9% | — | |
| 2026-05-12 15:02 | 2026-05-11 | MKSI | Batra Raj | Dir | A - Grant | — | +781.96 | 16.2K | +5% | — | |
| 2026-05-12 14:59 | 2026-05-11 | MKSI | COLELLA GERALD G | Dir | A - Grant | — | +781.96 | 8,999 | +10% | — | |
| D | 2026-04-20 11:31 | 2026-04-17 | MKSI | Williams John Edward | EVP, GM, PSD | M - OptEx | — | +1,741 | 5,381 | +48% | — |
| D | 2026-04-20 11:31 | 2026-04-17 | MKSI | Williams John Edward | EVP, GM, PSD | F - Tax | $269.89 | -825.97 | 4,555 | -15% | -$222.9K |
| DM | 2026-04-16 15:29 | 2026-04-15 | MKSI | McCarthy Michelle M | SVP, CAO | M - OptEx | — | +3,811 | 3,811 | New | — |
| D | 2026-04-16 15:29 | 2026-04-15 | MKSI | McCarthy Michelle M | SVP, CAO | F - Tax | $274.15 | -1,375 | 2,436 | -36% | -$377.1K |
| 2026-03-13 | 2026-03-12 | MKSI | Moloney Jacqueline F | Dir | S - Sale | $213.77 | -340.11 | 10.4K | -3% | -$72.7K | |
| 2026-03-09 | 2026-03-06 | MKSI | Taranto Eric Robert | EVP, GM, VSD | S - Sale | $220.52 | -4,568 | 15.4K | -23% | -$1.01M | |
| 2026-03-03 | 2026-03-02 | MKSI | Mora Elizabeth | Dir | S - Sale | $239.44 | -300 | 18.7K | -2% | -$71.8K | |
| 2026-02-25 | 2026-02-24 | MKSI | Schreiner James Alan | EVP, COO | S - Sale | $255.00 | -4,100 | 23.4K | -15% | -$1.05M | |
| MI | 2026-02-24 | 2026-02-20+ | MKSI | COLELLA GERALD G | Dir | S - Sale | $253.44 | -20.0K | 40.0K | -33% | -$5.07M |
| 2026-02-23 | 2026-02-20 | MKSI | Taranto Eric Robert | EVP, GM, VSD | S - Sale | $247.55 | -1,453 | 20.0K | -7% | -$359.6K | |
| 2026-02-23 | 2026-02-20 | MKSI | Burke Kathleen Flaherty | EVP, GC, Sec | S - Sale | $250.00 | -4,254 | 53.8K | -7% | -$1.06M | |
| 2026-02-23 | 2026-02-20 | MKSI | CANNONE PETER III | Dir | S - Sale | $258.06 | -1,250 | 8,362 | -13% | -$322.6K | |
| M | 2026-02-23 | 2026-02-20 | MKSI | McCarthy Michelle M | VP, CAO | S - Sale | $250.00 | -1,466 | 816 | -64% | -$366.5K |
| M | 2026-02-23 | 2026-02-20 | MKSI | Lee John Tseng-Chung | Pres, CEO, Dir | S - Sale | $256.77 | -30.0K | 171.4K | -15% | -$7.70M |
| 2026-02-23 | 2026-02-20 | MKSI | Moloney Jacqueline F | Dir | S - Sale | $247.55 | -829 | 10.7K | -7% | -$205.2K | |
| 2026-02-23 | 2026-02-20 | MKSI | Williams John Edward | EVP, GM, PSD | S - Sale | $256.41 | -2,043 | 3,640 | -36% | -$523.8K | |
| 2026-02-23 | 2026-02-20 | MKSI | Henry David Philip | EVP, Gbl Str Mktg, GM, MSD | S - Sale | $261.56 | -2,000 | 18.8K | -10% | -$523.1K | |
| D | 2026-02-18 | 2026-02-17 | MKSI | Taranto Eric Robert | EVP, GM, VSD | F - Tax | $260.74 | -2,712 | 21.5K | -11% | -$707.1K |
| DM | 2026-02-18 | 2026-02-17 | MKSI | Taranto Eric Robert | EVP, GM, VSD | M - OptEx | — | +6,473 | 19.5K | +50% | — |
| DM | 2026-02-18 | 2026-02-17 | MKSI | Williams John Edward | EVP, GM, PSD | M - OptEx | — | +3,238 | 3,940 | +461% | — |
| D | 2026-02-18 | 2026-02-17 | MKSI | Williams John Edward | EVP, GM, PSD | F - Tax | $260.74 | -1,195 | 5,683 | -17% | -$311.7K |
| DM | 2026-02-18 | 2026-02-17 | MKSI | Burke Kathleen Flaherty | EVP, GC, Sec | M - OptEx | — | +12.2K | 57.0K | +27% | — |
| D | 2026-02-18 | 2026-02-17 | MKSI | Burke Kathleen Flaherty | EVP, GC, Sec | F - Tax | $260.74 | -5,318 | 58.0K | -8% | -$1.39M |
| DM | 2026-02-18 | 2026-02-17 | MKSI | Henry David Philip | EVP, Gbl Str Mktg, GM, MSD | M - OptEx | — | +9,282 | 24.9K | +59% | — |
| D | 2026-02-18 | 2026-02-17 | MKSI | Henry David Philip | EVP, Gbl Str Mktg, GM, MSD | F - Tax | $260.74 | -4,097 | 20.8K | -16% | -$1.07M |
| D | 2026-02-18 | 2026-02-17 | MKSI | Mayampurath Ramakumar | EVP, CFO | F - Tax | $260.74 | -2,516 | 8,811 | -22% | -$656.0K |
| DM | 2026-02-18 | 2026-02-17 | MKSI | Mayampurath Ramakumar | EVP, CFO | M - OptEx | — | +5,660 | 8,625 | +191% | — |
| DM | 2026-02-18 | 2026-02-17 | MKSI | Lee John Tseng-Chung | Pres, CEO, Dir | M - OptEx | — | +69.9K | 205.2K | +52% | — |
| D | 2026-02-18 | 2026-02-17 | MKSI | Lee John Tseng-Chung | Pres, CEO, Dir | F - Tax | $260.74 | -32.5K | 184.7K | -15% | -$8.49M |
| DM | 2026-02-18 | 2026-02-17 | MKSI | Schreiner James Alan | EVP, COO | M - OptEx | — | +9,225 | 26.5K | +53% | — |
| D | 2026-02-18 | 2026-02-17 | MKSI | Schreiner James Alan | EVP, COO | F - Tax | $260.74 | -4,344 | 27.5K | -14% | -$1.13M |
| 2025-12-03 | 2025-12-02 | MKSI | Mora Elizabeth | Dir | S - Sale | $158.81 | -300 | 19.0K | -2% | -$47.6K | |
| D | 2025-11-18 | 2025-11-17 | MKSI | Mayampurath Ramakumar | EVP, CFO | F - Tax | $142.74 | -2,628 | 5,667 | -32% | -$375.1K |
| D | 2025-11-18 | 2025-11-17 | MKSI | Mayampurath Ramakumar | EVP, CFO | M - OptEx | — | +8,295 | 8,295 | New | — |
| DM | 2025-11-04 | 2025-10-31 | MKSI | Lee John Tseng-Chung | Pres, CEO, Dir | M - OptEx | — | +2,003 | 147.6K | +1% | — |
| D | 2025-11-04 | 2025-10-31 | MKSI | Lee John Tseng-Chung | Pres, CEO, Dir | F - Tax | $143.71 | -2,003 | 147.3K | -1% | -$287.9K |
| DM | 2025-11-04 | 2025-10-31 | MKSI | Burke Kathleen Flaherty | EVP, GC, Sec | M - OptEx | — | +777 | 51.2K | +2% | — |
| D | 2025-11-04 | 2025-10-31 | MKSI | Burke Kathleen Flaherty | EVP, GC, Sec | F - Tax | $143.71 | -777 | 51.1K | -1% | -$111.7K |
| 2025-10-23 | 2025-10-22 | MKSI | Schreiner James Alan | EVP, COO | S - Sale | $138.68 | -711 | 22.5K | -3% | -$98.6K | |
| 2025-10-02 | 2025-10-01 | MKSI | Moloney Jacqueline F | Dir | S - Sale | $122.14 | -300 | 11.6K | -3% | -$36.6K | |
| 2025-09-19 | 2025-09-18 | MKSI | Schreiner James Alan | EVP, COO | S - Sale | $124.00 | -838 | 23.2K | -3% | -$103.9K | |
| 2025-09-19 | 2025-09-18 | MKSI | Henry David Philip | EVP, Gbl Str Mktg, GM, MSD | S - Sale | $130.00 | -5,000 | 15.6K | -24% | -$650.0K | |
| 2025-09-03 | 2025-09-02 | MKSI | Mora Elizabeth | Dir | S - Sale | $99.85 | -300 | 19.3K | -2% | -$30.0K | |
| D | 2025-08-19 | 2025-08-18 | MKSI | Schreiner James Alan | EVP, COO | M - OptEx | — | +2,641 | 25.3K | +12% | — |
| D | 2025-08-19 | 2025-08-18 | MKSI | Schreiner James Alan | EVP, COO | F - Tax | $100.22 | -1,249 | 24.1K | -5% | -$125.2K |
| D | 2025-08-18 | 2025-08-15 | MKSI | Williams John Edward | EVP, GM, PSD | M - OptEx | — | +947.29 | 3,948 | +32% | — |
| D | 2025-08-18 | 2025-08-15 | MKSI | Williams John Edward | EVP, GM, PSD | F - Tax | $104.73 | -308 | 3,640 | -8% | -$32.3K |
| 2025-08-04 | 2025-08-01 | MKSI | Moloney Jacqueline F | Dir | S - Sale | $92.10 | -300 | 11.9K | -2% | -$27.6K | |
| 2025-07-08 | 2025-07-07 | MKSI | Schreiner James Alan | EVP, COO, MSD | S - Sale | $102.44 | -957 | 22.7K | -4% | -$98.0K | |
| 2025-07-07 | 2025-07-03 | MKSI | Henry David Philip | EVP, Ops, Corp Mktg | S - Sale | $105.00 | -2,000 | 20.6K | -9% | -$210.0K | |
| 2025-06-03 | 2025-06-02 | MKSI | Mora Elizabeth | Dir | S - Sale | $81.78 | -300 | 19.6K | -2% | -$24.5K | |
| 2025-05-13 | 2025-05-12 | MKSI | Mora Elizabeth | Dir | A - Grant | — | +2,479 | 19.9K | +14% | — | |
| 2025-05-13 | 2025-05-12 | MKSI | CANNONE PETER III | Dir | A - Grant | — | +2,479 | 9,612 | +35% | — | |
| 2025-05-13 | 2025-05-12 | MKSI | Batra Raj | Dir | A - Grant | — | +2,479 | 15.4K | +19% | — | |
| 2025-05-13 | 2025-05-12 | MKSI | Donahue Joseph B | Dir | A - Grant | — | +2,479 | 11.4K | +28% | — | |
| 2025-05-13 | 2025-05-12 | MKSI | JABRE WISSAM G | Dir | A - Grant | — | +2,479 | 4,488 | +123% | — | |
| 2025-05-13 | 2025-05-12 | MKSI | Moloney Jacqueline F | Dir | A - Grant | — | +2,479 | 12.2K | +26% | — | |
| 2025-05-13 | 2025-05-12 | MKSI | COLELLA GERARD G | Dir | A - Grant | — | +2,479 | 8,217 | +43% | — | |
| D | 2025-04-18 | 2025-04-17 | MKSI | Williams John Edward | EVP, GM, PSD | M - OptEx | — | +1,740 | 3,566 | +95% | — |
| D | 2025-04-18 | 2025-04-17 | MKSI | Williams John Edward | EVP, GM, PSD | F - Tax | $63.69 | -565 | 3,001 | -16% | -$36.0K |
| D | 2025-04-17 | 2025-04-15 | MKSI | McCarthy Michelle M | VP, CAO | F - Tax | $68.48 | -608 | 1,466 | -29% | -$41.6K |
| DM | 2025-04-17 | 2025-04-15 | MKSI | McCarthy Michelle M | VP, CAO | M - OptEx | — | +2,074 | 968 | New | — |
| 2025-03-04 | 2025-03-03 | MKSI | Mora Elizabeth | Dir | S - Sale | $92.46 | -275 | 17.4K | -2% | -$25.4K | |
| 2025-03-04 | 2025-03-03 | MKSI | Moloney Jacqueline F | Dir | S - Sale | $92.46 | -300 | 9,683 | -3% | -$27.7K | |
| DM | 2025-02-19 | 2025-02-18 | MKSI | Henry David Philip | EVP, Ops, Corp Mktg | M - OptEx | — | +8,014 | 18.3K | +78% | — |
| D | 2025-02-19 | 2025-02-18 | MKSI | Henry David Philip | EVP, Ops, Corp Mktg | F - Tax | $103.67 | -2,372 | 22.4K | -10% | -$245.9K |
| D | 2025-02-19 | 2025-02-18 | MKSI | Williams John Edward | EVP, GM, PSD | F - Tax | $103.67 | -901 | 1,826 | -33% | -$93.4K |
| DM | 2025-02-19 | 2025-02-18 | MKSI | Williams John Edward | EVP, GM, PSD | M - OptEx | — | +2,714 | 1,586 | New | — |
| DM | 2025-02-19 | 2025-02-18 | MKSI | Burke Kathleen Flaherty | EVP, GC, Sec | M - OptEx | — | +11.6K | 53.2K | +28% | — |
| D | 2025-02-19 | 2025-02-18 | MKSI | Burke Kathleen Flaherty | EVP, GC, Sec | F - Tax | $103.67 | -3,970 | 50.9K | -7% | -$411.6K |
| D | 2025-02-19 | 2025-02-18 | MKSI | Taranto Eric Robert | EVP, GM, VSD | F - Tax | $103.67 | -1,760 | 17.5K | -9% | -$182.5K |
| DM | 2025-02-19 | 2025-02-18 | MKSI | Taranto Eric Robert | EVP, GM, VSD | M - OptEx | — | +5,924 | 14.4K | +70% | — |
| DM | 2025-02-19 | 2025-02-18 | MKSI | Lee John Tseng-Chung | Pres, CEO, Dir | M - OptEx | — | +61.8K | 126.7K | +95% | — |
| D | 2025-02-19 | 2025-02-18 | MKSI | Lee John Tseng-Chung | Pres, CEO, Dir | F - Tax | $103.67 | -27.3K | 147.1K | -16% | -$2.83M |
| DM | 2025-02-19 | 2025-02-18 | MKSI | Schreiner James Alan | EVP, COO, MSD | M - OptEx | — | +8,341 | 21.6K | +63% | — |
Purchase Sale Sale after option exercise All abbreviations