David Philip Henry insider trades: Mks (MKSI) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where David reports to the SEC
Open-market buys and sales
7 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Jun 1, 2026 | MKSI | ↓ Sell | 6,000 | $314.43 | $1.9M | Direct | Jun 2, 2026 (1d) |
| May 26, 2026 | MKSI | ↓ Sell | 2,500 | $330.50 | $826K | Direct | May 27, 2026 (1d) |
| Feb 20, 2026 | MKSI | ↓ Sell | 2,000 | $261.56 | $523K | Direct | Feb 23, 2026 (3d) |
| Sep 18, 2025 | MKSI | ↓ Sell | 5,000 | $130.00 | $650K | Direct | Sep 19, 2025 (1d) |
| Jul 3, 2025 | MKSI | ↓ Sell | 2,000 | $105.00 | $210K | Direct | Jul 7, 2025 (4d) |
| Nov 7, 2023 | MKSI | ↑ Buy | 2,500 | $68.34 | $171K | Direct | Nov 8, 2023 (1d) |
| May 20, 2021 | MKSI | ↓ Sell | 284 | $186.70 | $53K | Direct | May 21, 2021 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other MKSI insiders
Open-market trades in the last 12 months
About David Philip Henry's insider trades
David Philip Henry is EVP, Global Str Mktg & GM, MSD at Mks (MKSI). Since May 20, 2021, David has reported 1 open-market purchase worth $171K and 6 sales worth $4.1M on SEC Form 4. In the last 12 months: 3 sales ($3.2M).
Their filings also include grants and awards (12 filings), shares withheld for taxes (9 filings), option exercises (9 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every MKSI insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.