Gerald M Blumenstock insider trades: Axcelis Technologies (ACLS) stock sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Gerald reports to the SEC
Open-market buys and sales
3 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| May 21, 2026 | ACLS | ↓ Sell | 1,161 | $152.70 | $177K | Direct | May 22, 2026 (1d) |
| May 14, 2026 | ACLS | ↓ Sell | 1,015 | $162.31 | $165K | Direct | May 15, 2026 (1d) |
| Dec 11, 2025 | ACLS | ↓ Sell | 3,034 | $89.46 | $271K | Direct | Dec 12, 2025 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other ACLS insiders
Open-market trades in the last 12 months
About Gerald M Blumenstock's insider trades
Gerald M Blumenstock is EVP, Research, Dev. & Eng. at Axcelis Technologies (ACLS). Since Dec 11, 2025, Gerald has reported no open-market purchases and 3 sales worth $613K on SEC Form 4. In the last 12 months: 3 sales ($613K).
Their filings also include shares withheld for taxes (7 filings), grants and awards (4 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 ACLS insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.