Christopher Tatnall 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 Christopher reports to the SEC
Open-market buys and sales
1 trade reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| May 20, 2026 | ACLS | ↓ Sell | 1,166 | $149.75 | $175K | Direct | May 21, 2026 (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 Christopher Tatnall's insider trades
Christopher Tatnall is EVP Global Customer Operations at Axcelis Technologies (ACLS). Since May 20, 2026, Christopher has reported no open-market purchases and 1 sale worth $175K on SEC Form 4. In the last 12 months: 1 sale ($175K).
Their filings also include shares withheld for taxes (11 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.