All stock lists
Axcelis Technologies Inc (NASDAQ:ACLS)
US · Delayed Price · Currency is USD
Technology · Semiconductors
109.94+3.37 (+3.16%)
Insider Score
––Not scored
ACLS Insider Score
Insiders here have filed 2 Form 4s in the last 90 days, but all of them are share awards, grants or other non-market transactions. Those are compensation, not a decision to buy, so they are not scored.
ACLS Stock Insider Trading Activity
ACLS stock’s insider trading shows 11 sales on the open market for an estimated $2.58M by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Tatnall Christopher Other | Tax withheld | 136 | $105.04 | $14.29K | 0.5% | 27,491 | Sep 15, 2026 | — | Form 4 |
| Redinbo Greg Other | Tax withheld | 208 | $105.04 | $21.85K | 0.6% | 34,816 | Sep 15, 2026 | — | Form 4 |
| Ryzhik David CFO | Tax withheld | 127 | $145.01 | $18.42K | 1.3% | 9,884 | Jul 15, 2026 | — | Form 4 |
| Ryzhik David CFO | Tax withheld | 94 | $145.01 | $13.63K | 1.0% | 9,790 | Jul 15, 2026 | — | Form 4 |
| Ryzhik David CFO | Tax withheld | 76 | $176.85 | $13.44K | 0.8% | 9,955 | Jun 16, 2026 | — | Form 4 |
| Blumenstock Gerald M Other | Tax withheld | 506 | $191.60 | $96.95K | 2.5% | 19,987 | Jun 15, 2026 | — | Form 4 |
| Sayiner Necip Director | Sell | 1,586 | $157.44 | $249.70K | 18.2% | 7,112 | Jun 3, 2026 | — | Form 4 |
| Mahoney Robert John Other | Sell | 1,155 | $155.24 | $179.30K | 7.4% | 14,410 | Jun 2, 2026 | — | Form 4 |
| Sutton Todd Other | Sell | 2,000 | $159.99 | $319.98K | 23.9% | 6,360 | May 27, 2026 | — | Form 4 |
| Evans Eileen Other | Sell | 926 | $155.51 | $144.00K | 2.9% | 31,295 | May 22, 2026 | — | Form 4 |
| St Dennis Thomas Director | Sell | 900 | $155.37 | $139.83K | 4.8% | 17,695 | May 22, 2026 | — | Form 4 |
| Blumenstock Gerald M Other | Sell | 1,161 | $152.70 | $177.28K | 5.4% | 20,493 | May 21, 2026 | — | Form 4 |
| Tatnall Christopher Other | Sell | 1,166 | $149.75 | $174.61K | 4.0% | 27,627 | May 20, 2026 | — | Form 4 |
| KURTZWEIL JOHN T Director | Sell | 3,500 | $138.79 | $485.76K | 9.6% | 32,990 | May 19, 2026 | — | Form 4 |
| Quirk Jeanne Director | Sell | 1,789 | $140.22 | $250.85K | 13.6% | 11,400 | May 19, 2026 | — | Form 4 |
| GRAVES GREGORY B Director | Sell | 600 | $142.51 | $85.51K | 9.9% | 5,473 | May 19, 2026 | — | Form 4 |
| GRAVES GREGORY B Director | Sell | 2,625 | $141.41 | $371.20K | 30.2% | 6,073 | May 19, 2026 | — | Form 4 |
| Mahoney Robert John Other | Tax withheld | 182 | $146.24 | $26.62K | 1.1% | 15,695 | May 18, 2026 | — | Form 4 |
| Redinbo Greg Other | Tax withheld | 79 | $146.24 | $11.55K | 0.2% | 35,024 | May 18, 2026 | — | Form 4 |
| Redinbo Greg Other | Tax withheld | 111 | $146.24 | $16.23K | 0.3% | 35,103 | May 18, 2026 | — | Form 4 |
| Low Russell CEO | Tax withheld | 711 | $146.24 | $103.98K | 0.5% | 154,900 | May 18, 2026 | — | Form 4 |
| Sutton Todd Other | Tax withheld | 184 | $146.24 | $26.91K | 2.2% | 8,360 | May 18, 2026 | — | Form 4 |
| Mahoney Robert John Other | Tax withheld | 130 | $146.24 | $19.01K | 0.8% | 15,565 | May 18, 2026 | — | Form 4 |
| Redinbo Greg Other | Tax withheld | 177 | $155.18 | $27.47K | 0.5% | 35,214 | May 15, 2026 | — | Form 4 |
| Redinbo Greg Other | Tax withheld | 452 | $155.18 | $70.14K | 1.3% | 35,601 | May 15, 2026 | — | Form 4 |
| Redinbo Greg Other | Award | 3,115 | — | — | 9.5% | 36,053 | May 15, 2026 | — | Form 4 |
| Redinbo Greg Other | Tax withheld | 210 | $155.18 | $32.59K | 0.6% | 35,391 | May 15, 2026 | — | Form 4 |
| Evans Eileen Other | Award | 3,893 | — | — | 15.4% | 29,195 | May 15, 2026 | — | Form 4 |
| Evans Eileen Other | Tax withheld | 867 | $155.18 | $134.54K | 2.6% | 32,221 | May 15, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Sell (S) — Open-market or private sale
- Award (A) — Grant or award from the company, not a purchase
- Tax withheld (F) — Shares withheld to pay tax or an exercise price
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.