MKSI
MKS Instruments Inc
NASDAQ: MKSI · TECHNOLOGY · SCIENTIFIC & TECHNICAL INSTRUMENTS
$265.44
-0.92% today
Updated 2026-04-29
Market cap
$17.87B
P/E ratio
60.74
P/S ratio
4.55x
EPS (TTM)
$4.37
Dividend yield
0.33%
52W range
$71 – $294
Volume
1.2M
MKS Instruments Inc (MKSI) Insider transactions
Net insider activity
Net selling (92,950 shares)
Buy transactions
40
Sell transactions
60
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-04-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Sale | 1,741 | — | — |
| 2026-04-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Buy | 1,741 | — | — |
| 2026-04-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Sale | 826 | $269.89 | $222929.14 |
| 2026-04-15 | MCCARTHY, MICHELLE M | SVP & Chief Accounting Officer | Sale | 1,736 | — | — |
| 2026-04-15 | MCCARTHY, MICHELLE M | SVP & Chief Accounting Officer | Buy | 1,673 | — | — |
| 2026-04-15 | MCCARTHY, MICHELLE M | SVP & Chief Accounting Officer | Sale | 1,107 | — | — |
| 2026-04-15 | MCCARTHY, MICHELLE M | SVP & Chief Accounting Officer | Sale | 968 | — | — |
| 2026-04-15 | MCCARTHY, MICHELLE M | SVP & Chief Accounting Officer | Buy | 1,736 | — | — |
| 2026-04-15 | MCCARTHY, MICHELLE M | SVP & Chief Accounting Officer | Sale | 1,375 | $274.15 | $376956.25 |
| 2026-04-15 | MCCARTHY, MICHELLE M | SVP & Chief Accounting Officer | Buy | 1,107 | — | — |
| 2026-04-15 | MCCARTHY, MICHELLE M | SVP & Chief Accounting Officer | Buy | 968 | — | — |
| 2026-03-12 | MOLONEY, JACQUELINE F | Director | Sale | 340 | $213.77 | $72682.38 |
| 2026-03-06 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Sale | 4,568 | $220.52 | $1.01M |
| 2026-03-02 | MORA, ELIZABETH | Director | Sale | 300 | $239.44 | $71832.00 |
| 2026-02-24 | SCHREINER, JAMES ALAN | EVP & COO | Sale | 4,100 | $255.00 | $1.05M |
| 2026-02-24 | COLELLA, GERALD G | Director | Sale | 10,000 | $253.97 | $2.54M |
| 2026-02-20 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Sale | 2,043 | $256.41 | $523840.52 |
| 2026-02-20 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Sale | 1,453 | $247.55 | $359690.15 |
| 2026-02-20 | MOLONEY, JACQUELINE F | Director | Sale | 829 | $247.55 | $205218.95 |
| 2026-02-20 | MCCARTHY, MICHELLE M | VP & Chief Accounting Officer | Sale | 816 | $250.35 | $204283.89 |
| 2026-02-20 | MCCARTHY, MICHELLE M | VP & Chief Accounting Officer | Sale | 650 | $249.57 | $162218.81 |
| 2026-02-20 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Sale | 13,310 | $256.05 | $3.41M |
| 2026-02-20 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Sale | 12,812 | $256.93 | $3.29M |
| 2026-02-20 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Sale | 1,988 | $257.81 | $512523.10 |
| 2026-02-20 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Sale | 1,890 | $259.70 | $490839.05 |
| 2026-02-20 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Sale | 2,000 | $261.56 | $523120.20 |
| 2026-02-20 | COLELLA, GERALD G | Director | Sale | 10,000 | $252.90 | $2.53M |
| 2026-02-20 | CANNONE, PETER III | Director | Sale | 1,250 | $258.06 | $322574.50 |
| 2026-02-20 | BURKE, KATHLEEN FLAHERTY | EVP, GC & Secretary | Sale | 4,254 | $250.00 | $1.06M |
| 2026-02-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Buy | 1,474 | — | — |
| 2026-02-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Sale | 1,106 | — | — |
| 2026-02-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Sale | 991 | — | — |
| 2026-02-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Sale | 841 | — | — |
| 2026-02-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Sale | 300 | — | — |
| 2026-02-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Sale | 1,195 | $260.74 | $311584.30 |
| 2026-02-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Buy | 1,106 | — | — |
| 2026-02-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Buy | 991 | — | — |
| 2026-02-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Buy | 841 | — | — |
| 2026-02-17 | WILLIAMS, JOHN EDWARD | EVP & GM, PSD | Buy | 300 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Sale | 1,764 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Buy | 1,759 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Sale | 1,303 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Sale | 1,167 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Sale | 976 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Sale | 914 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Sale | 348 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Sale | 2,712 | $260.74 | $707126.88 |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Buy | 1,764 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Buy | 1,303 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Buy | 1,167 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Buy | 976 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Buy | 914 | — | — |
| 2026-02-17 | TARANTO, ERIC ROBERT | EVP & GM, VSD | Buy | 348 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Sale | 2,567 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Buy | 2,377 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Sale | 1,944 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Sale | 1,741 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Sale | 1,330 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Sale | 1,211 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Sale | 432 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Sale | 4,344 | $260.74 | $1.13M |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Buy | 2,567 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Buy | 1,944 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Buy | 1,741 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Buy | 1,330 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Buy | 1,211 | — | — |
| 2026-02-17 | SCHREINER, JAMES ALAN | EVP & COO | Buy | 432 | — | — |
| 2026-02-17 | MAYAMPURATH, RAMAKUMAR | EVP & CFO | Buy | 4,279 | — | — |
| 2026-02-17 | MAYAMPURATH, RAMAKUMAR | EVP & CFO | Sale | 2,958 | — | — |
| 2026-02-17 | MAYAMPURATH, RAMAKUMAR | EVP & CFO | Sale | 2,702 | — | — |
| 2026-02-17 | MAYAMPURATH, RAMAKUMAR | EVP & CFO | Buy | 2,958 | — | — |
| 2026-02-17 | MAYAMPURATH, RAMAKUMAR | EVP & CFO | Buy | 2,702 | — | — |
| 2026-02-17 | MAYAMPURATH, RAMAKUMAR | EVP & CFO | Sale | 2,516 | $260.74 | $656021.84 |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Sale | 22,088 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Sale | 16,989 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Buy | 15,593 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Sale | 12,091 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Sale | 7,654 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Sale | 7,208 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Sale | 3,859 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Sale | 32,548 | $260.74 | $8.49M |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Buy | 22,088 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Buy | 16,989 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Buy | 12,091 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Buy | 7,654 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Buy | 7,208 | — | — |
| 2026-02-17 | LEE, JOHN TSENG-CHUNG | Director, President & CEO | Buy | 3,859 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Buy | 2,567 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Sale | 2,406 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Sale | 2,054 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Sale | 1,841 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Sale | 1,278 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Sale | 1,247 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Sale | 456 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Sale | 4,097 | $260.74 | $1.07M |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Buy | 2,406 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Buy | 2,054 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Buy | 1,841 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Buy | 1,278 | — | — |
| 2026-02-17 | HENRY, DAVID PHILIP | EVP, Global Str Mktg & GM, MSD | Buy | 1,247 | — | — |