| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Insider activity in MKSI over the last quarter tilts toward selling: insiders offloaded a net 10,757 shares worth roughly $3.2M.
MKSI sits in the Electronic Equipment, Instruments & Components industry within the Information Technology sector, so this activity is best read against the sector's broader insider trend.
| Role | Insider | Shares | Value | 30d |
|---|---|---|---|---|
| CEO | 134.8K | $40.70M | - | |
| VP | 49.4K | $15.82M | - | |
| Dir | 20.0K | $6.78M | - | |
| COO | 19.2K | $6.63M | - | |
| Dir | 18.8K | $4.73M | - |
Buys and sells only
| Date | Insider | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Sep 1, 2026 | Mora Elizabeth57 | Director | Sell10b5-1 | 300 | $250.96 | $75,288.00 | -1.6% | - | - | |
| Aug 14, 2026 | Lee John Tseng-Chung | President &CEO | Sell10b5-1 | 10,000 | $302.01 | $3,020,100.00 | -6.9% | - | - | |
| Aug 3, 2026 | Williams John Edward | EVP &Gm, Psd | Sell10b5-1 | 457 | $288.31 | $131,757.67 | -10.0% | - | - | |
| Jun 12, 2026 | Schreiner James Alan | EVP &COO | Sell | 3,500 | $345.82 | $1,210,370.07 | -15.4% | -26.4% | - | |
| Jun 10, 2026 | Schreiner James Alan | EVP &COO | Sell10b5-1 | 781 | $317.42 | $247,905.02 | -3.3% | -16.0% | - | |
| Jun 5, 2026 | McCarthy Michelle M73 | SVP &Chief Accounting Officer | Sell10b5-1 | 2,434 | $315.23 | $767,269.82 | -99.9% | -17.2% | - | |
| Jun 1, 2026 | Henry David Philip54 | EVP, Global Str Mktg &Gm, Msd | Sell | 6,000 | $314.43 | $1,886,583.00 | -36.5% | -19.3% | - | |
| Jun 1, 2026 | Mora Elizabeth57 | Director | Sell10b5-1 | 300 | $318.02 | $95,406.00 | -1.5% | -19.3% | - | |
| May 27, 2026 | Colella Gerald G51 | Director | Sell10b5-1 | 20,000 | $333.40 | $6,668,075.08 | -50.0% | -17.5% | - | |
| May 27, 2026 | Donahue Joseph B | Director | Sell | 2,100 | $327.95 | $688,703.40 | -17.3% | -17.5% | - |