Updated Jul 16, 2026 · Last SEC filing 2026-06-17
AXCELIS TECHNOLOGIES INC (ACLS) has filed 39 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-17. 2 Form 8-K material event filings were reported by ACLS in the last 90 days. 17 Form 144 notices of proposed sale were filed for ACLS stock. InsiderAlpha tracks every ACLS SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SIC classification | Special Industry Machinery, NEC (SIC 3559) |
|---|---|
| SEC CIK | 0001113232 |
| Form 4 filings (90d) | 39 |
|---|---|
| Form 8-K filings (90d) | 2 |
| Form 144 notices (90d) | 17 |
| Latest Form 4 filing | 2026-06-17 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Ryzhik David | SVP Interim CFO | F — Tax withholding / forfeiture | 76 | $176.84 | $13K | SEC | |
| Blumenstock Gerald M | EVP, Research, Dev. & Eng. | F — Tax withholding / forfeiture | 506 | $191.60 | $97K | SEC | |
| Sayiner Necip | Insider | S — Open-market sale | 1.6K | $157.44 | $250K | SEC | |
| Mahoney Robert John | EVP Global Operations | S — Open-market sale | 1.2K | $155.24 | $179K | SEC | |
| Sutton Todd | VP Corporate Controller | S — Open-market sale | 2.0K | $159.99 | $320K | SEC | |
| St Dennis Thomas | Insider | S — Open-market sale | 900 | $155.37 | $140K | SEC | |
| Evans Eileen | EVP, General Counsel and Sec'y | S — Open-market sale | 926 | $155.51 | $144K | SEC | |
| Blumenstock Gerald M | EVP, Research, Dev. & Eng. | S — Open-market sale | 1.2K | $152.70 | $177K | SEC | |
| Tatnall Christopher | EVP Global Customer Operations | S — Open-market sale | 1.2K | $149.75 | $175K | SEC | |
| Quirk Jeanne | Insider | S — Open-market sale | 1.8K | $140.22 | $251K | SEC | |
| GRAVES GREGORY B | Insider | S — Open-market sale | 600 | $142.51 | $86K | SEC | |
| GRAVES GREGORY B | Insider | S — Open-market sale | 2.6K | $141.41 | $371K | SEC | |
| KURTZWEIL JOHN T | Insider | S — Open-market sale | 3.5K | $138.79 | $486K | SEC | |
| Redinbo Greg | EVP MARKETING AND APPLICATIONS | F — Tax withholding / forfeiture | 79 | $146.24 | $12K | SEC | |
| Redinbo Greg | EVP MARKETING AND APPLICATIONS | F — Tax withholding / forfeiture | 111 | $146.24 | $16K | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for AXCELIS TECHNOLOGIES INC (ACLS). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Mahoney Robert John | 10 | $709K |
| Low Russell | 8 | $2.52M |
| Redinbo Greg | 8 | $622K |
| Tatnall Christopher | 7 | $489K |
| Blumenstock Gerald M | 7 | $608K |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in ACLS insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
Open the live ACLS dashboard on InsiderAlpha for real-time alerts, charting, and full historical filing search.