As of the latest Form 4 filed Jun 17, 2026.
What Axcelis Technologies Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 78 most recent filings for ACLS.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-17 | 2026-06-16 | Ryzhik David SVP Interim CFO | FTax | −76.00 | $176.85 | $13.4K | No | Form 4 ↗ |
| 2026-06-16 | 2026-06-15 | Blumenstock Gerald M EVP, Research, Dev. & Eng. | FTax | −506.00 | $191.60 | $96.9K | No | Form 4 ↗ |
| 2026-06-04 | 2026-06-03 | Sayiner Necip Director | SSale | −1.59K | $157.44 | $250K | No | Form 4 ↗ |
| 2026-06-03 | 2026-06-02 | Mahoney Robert John EVP Global Operations | SSale | −1.16K | $155.24 | $179K | No | Form 4 ↗ |
| 2026-05-28 | 2026-05-27 | Sutton Todd VP Corporate Controller | SSale | −2.00K | $159.99 | $320K | No | Form 4 ↗ |
| 2026-05-26 | 2026-05-22 | St Dennis Thomas Director | SSale | −900.00 | $155.37 | $140K | No | Form 4 ↗ |
| 2026-05-22 | 2026-05-22 | Evans Eileen EVP, General Counsel and Sec'y | SSale | −926.00 | $155.51 | $144K | No | Form 4 ↗ |
| 2026-05-22 | 2026-05-21 | Blumenstock Gerald M EVP, Research, Dev. & Eng. | SSale | −1.16K | $152.70 | $177K | No | Form 4 ↗ |
| 2026-05-21 | 2026-05-20 | Tatnall Christopher EVP Global Customer Operations | SSale | −1.17K | $149.75 | $175K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-19 | Quirk Jeanne Director | SSale | −1.79K | $140.22 | $251K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-19 | GRAVES GREGORY B Director | SSale | −600.00 | $142.51 | $85.5K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-19 | GRAVES GREGORY B, Director | SSale | −2.63K | $141.41 | $371K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-19 | KURTZWEIL JOHN T Director | SSale | −3.50K | $138.79 | $486K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Sutton Todd VP Corporate Controller | FTax | −184.00 | $146.24 | $26.9K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Mahoney Robert John EVP Global Operations | FTax | −130.00 | $146.24 | $19.0K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Mahoney Robert John, EVP Global Operations | FTax | −182.00 | $146.24 | $26.6K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Redinbo Greg EVP MARKETING AND APPLICATIONS | FTax | −79.00 | $146.24 | $11.6K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Redinbo Greg, EVP MARKETING AND APPLICATIONS | FTax | −111.00 | $146.24 | $16.2K | No | Form 4 ↗ |
| 2026-05-20 | 2026-05-18 | Low Russell PRESIDENT AND CEO | FTax | −711.00 | $146.24 | $104K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Sutton Todd VP Corporate Controller | FTax | −103.00 | $155.18 | $16.0K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Sutton Todd, VP Corporate Controller | FTax | −112.00 | $155.18 | $17.4K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Sutton Todd, VP Corporate Controller | FTax | −226.00 | $155.18 | $35.1K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Sutton Todd, VP Corporate Controller | AAward | +1.17K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Ryzhik David SVP Interim CFO | FTax | −226.00 | $155.18 | $35.1K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Ryzhik David, SVP Interim CFO | AAward | +3.12K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Mahoney Robert John EVP Global Operations | FTax | −61.00 | $155.18 | $9.47K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Mahoney Robert John, EVP Global Operations | FTax | −170.00 | $155.18 | $26.4K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Mahoney Robert John, EVP Global Operations | FTax | −173.00 | $155.18 | $26.8K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Mahoney Robert John, EVP Global Operations | FTax | −372.00 | $155.18 | $57.7K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Mahoney Robert John, EVP Global Operations | AAward | +1.95K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Mahoney Robert John, EVP Global Operations | AAward | +1.95K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Tatnall Christopher EVP Global Customer Operations | FTax | −170.00 | $155.18 | $26.4K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Tatnall Christopher, EVP Global Customer Operations | FTax | −345.00 | $155.18 | $53.5K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Tatnall Christopher, EVP Global Customer Operations | FTax | −744.00 | $155.18 | $115K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Tatnall Christopher, EVP Global Customer Operations | AAward | +3.50K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Tatnall Christopher, EVP Global Customer Operations | AAward | +3.50K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Blumenstock Gerald M EVP, Research, Dev. & Eng. | FTax | −345.00 | $155.18 | $53.5K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Blumenstock Gerald M, EVP, Research, Dev. & Eng. | FTax | −744.00 | $155.18 | $115K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Blumenstock Gerald M, EVP, Research, Dev. & Eng. | AAward | +2.73K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Blumenstock Gerald M, EVP, Research, Dev. & Eng. | AAward | +2.73K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Redinbo Greg EVP MARKETING AND APPLICATIONS | FTax | −177.00 | $155.18 | $27.5K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Redinbo Greg, EVP MARKETING AND APPLICATIONS | FTax | −210.00 | $155.18 | $32.6K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Redinbo Greg, EVP MARKETING AND APPLICATIONS | FTax | −452.00 | $155.18 | $70.1K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Redinbo Greg, EVP MARKETING AND APPLICATIONS | AAward | +3.12K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Redinbo Greg, EVP MARKETING AND APPLICATIONS | AAward | +3.12K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Evans Eileen EVP, General Counsel and Sec'y | FTax | −867.00 | $155.18 | $135K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Evans Eileen, EVP, General Counsel and Sec'y | AAward | +3.89K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Evans Eileen, EVP, General Counsel and Sec'y | AAward | +3.89K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Low Russell PRESIDENT AND CEO | FTax | −1.45K | $155.18 | $225K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Low Russell, PRESIDENT AND CEO | FTax | −1.72K | $155.18 | $267K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Low Russell, PRESIDENT AND CEO | FTax | −3.72K | $155.18 | $577K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Low Russell, PRESIDENT AND CEO | AAward | +19.5K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Low Russell, PRESIDENT AND CEO | AAward | +19.5K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-18 | 2026-05-15 | Quirk Jeanne Director | AAward | +1.44K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-18 | 2026-05-15 | Chiu Tzu Yin Director | AAward | +1.44K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-18 | 2026-05-15 | Titinger Jorge Director | AAward | +1.44K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-18 | 2026-05-15 | St Dennis Thomas Director | AAward | +1.44K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-18 | 2026-05-15 | Sayiner Necip Director | AAward | +1.44K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-18 | 2026-05-15 | GRAVES GREGORY B Director | AAward | +1.44K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-18 | 2026-05-15 | KURTZWEIL JOHN T Director | AAward | +1.44K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-14 | Sutton Todd VP Corporate Controller | SSale | −2.57K | $163.89 | $422K | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-14 | Blumenstock Gerald M EVP, Research, Dev. & Eng. | SSale | −1.01K | $162.32 | $165K | No | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | Redinbo Greg EVP MARKETING AND APPLICATIONS | SSale | −2.88K | $160.85 | $464K | No | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | Titinger Jorge Director | SSale | −2.00K | $164.14 | $328K | No | Form 4 ↗ |
| 2026-05-13 | 2026-05-12 | Mahoney Robert John EVP Global Operations | SSale | −2.26K | $161.00 | $364K | No | Form 4 ↗ |
| 2026-05-07 | 2026-05-06 | Low Russell PRESIDENT AND CEO | SSale | −7.47K | $156.75 | $1.17M | Yes (planned) | Form 4 ↗ |
| 2026-05-04 | 2026-05-01 | Low Russell PRESIDENT AND CEO | SSale | −1.24K | $138.86 | $173K | Yes (planned) | Form 4 ↗ |
| 2026-04-21 | 2026-04-20 | Tatnall Christopher EVP Global Customer Operations | FTax | −907.00 | $131.02 | $119K | No | Form 4 ↗ |
| 2026-04-02 | 2026-04-01 | Low Russell PRESIDENT AND CEO | SSale | −1.24K | $94.06 | $117K | Yes (planned) | Form 4 ↗ |
| 2026-03-26 | 2026-03-24 | Low Russell PRESIDENT AND CEO | SSale | −1.24K | $90.00 | $112K | Yes (planned) | Form 4 ↗ |
| 2026-03-03 | 2026-03-02 | Mahoney Robert John EVP Global Operations | FTax | −573.00 | $86.58 | $49.6K | No | Form 4 ↗ |
| 2026-03-03 | 2026-03-02 | Tatnall Christopher EVP Global Customer Operations | FTax | −1.12K | $86.58 | $97.1K | No | Form 4 ↗ |
| 2026-03-03 | 2026-03-02 | Blumenstock Gerald M EVP, Research, Dev. & Eng. | FTax | −1.12K | $86.58 | $97.1K | No | Form 4 ↗ |
| 2026-03-03 | 2026-03-02 | Redinbo Greg EVP MARKETING AND APPLICATIONS | FTax | −723.00 | $86.58 | $62.6K | No | Form 4 ↗ |
| 2026-03-03 | 2026-03-02 | COOGAN JAMES GORDON EVP AND CFO | FTax | −1.80K | $86.58 | $156K | No | Form 4 ↗ |
| 2026-03-03 | 2026-03-02 | Low Russell PRESIDENT AND CEO | FTax | −5.23K | $86.58 | $453K | No | Form 4 ↗ |
| 2026-02-23 | 2026-02-20 | Titinger Jorge Director | SSale | −1.00K | $80.00 | $80.0K | No | Form 4 ↗ |
| 2026-01-16 | 2026-01-15 | Mahoney Robert John EVP Global Operations | AAward | +1.73K | $0.00 | $0.00 | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also ACLS’s full analysis or the market-wide insider trading feed. The tabs above jump to ACLS’s other SEC data.
Source: SEC Form 4 filings for ACLS, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.