David Philip Henry is VP at MKS INSTRUMENTS INC (MKSI). They have made 4 open-market trades across 1 company since 2021, most recently 2026-06-01.
CIK 0001842459
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
1 open-market purchase totalling $171K since 2023, against 3 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MKSI | 10,421 | $2.0M |
Shares reported on the most recent Form 4, priced at the 2026-06-02 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MKSI | SELL | 2026-06-01 | 2026-06-02 | $314.43 | $1.9M | +5.9% | +9.1% | -23.6% |
| MKSI | SELL · 10b5-1 | 2026-05-26 | 2026-05-27 | $330.50 | $826K | -4.3% | +19.0% | -17.2% |
| MKSI | SELL | 2026-02-20 | 2026-02-23 | $261.56 | $523K | -9.6% | -4.4% | +31.0% |
| MKSI | SELL · 10b5-1 | 2025-09-18 | 2025-09-19 | $130.00 | $650K | +1.9% | +9.9% | +21.9% |
| MKSI | SELL · 10b5-1 | 2025-07-03 | 2025-07-07 | $105.00 | $210K | +0.5% | -13.4% | +34.8% |
| MKSI | BUY | 2023-11-07 | 2023-11-08 | $68.34 | $171K | +11.1% | +20.8% | +55.0% |
| MKSI | SELL | 2021-05-20 | 2021-05-21 | $186.70 | $106K | -1.3% | -7.8% | -23.7% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.