Mary G. Puma is CEO & President at AXCELIS TECHNOLOGIES INC (ACLS). They have made 42 open-market trades across 2 companies since 2007, most recently 2026-08-05.
CIK 0001158015
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
5 open-market purchases totalling $214K since 2007, against 37 sales. Across 5 scored buys the stock is down 0.7% at ninety days, and 0.6 points ahead of the S&P over the same stretch.
5 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 0% | 100% | 80% |
| Avg Move | -4.7% | +1.2% | -0.7% |
| Alpha | +1.1% | +0.9% | +0.6% |
| Scored | 5 | 5 | 5 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| NDSN | SELL | 2023-07-14 | 2023-07-17 | $245.92 | $1.0M | +0.4% | -4.4% | -9.1% |
| ACLS | SELL | 2023-06-12 | 2023-06-12 | $181.80 | $2.1M | -7.6% | -3.8% | -2.8% |
| ACLS | SELL | 2023-06-07 | 2023-06-07 | $173.58 | $7.5M | -2.1% | +1.8% | +13.3% |
| ACLS | SELL | 2023-05-25 | 2023-05-25 | $151.83 | $6.0M | +11.4% | +10.0% | +15.5% |
| ACLS | SELL | 2023-05-18 | 2023-05-18 | $141.52 | $2.4M | +8.8% | +14.9% | +14.3% |
| ACLS | SELL | 2023-05-11 | 2023-05-11 | $125.00 | $2.7M | +13.6% | +44.2% | +37.0% |
| ACLS | SELL | 2023-02-13 | 2023-02-13 | $124.93 | $5.9M | -2.4% | -2.1% | +1.2% |
| ACLS | SELL | 2022-12-08 | 2022-12-08 | $80.31 | $675K | -0.7% | +13.8% | +61.7% |
| ACLS | SELL | 2022-12-01 | 2022-12-05 | $80.10 | $552K | +3.8% | -1.3% | +61.6% |
| ACLS | SELL | 2022-11-23 | 2022-11-28 | $80.01 | $640K | +6.4% | +0.5% | +62.7% |
| ACLS | SELL | 2022-08-12 | 2022-08-12 | $75.94 | $2.0M | -5.9% | -13.7% | -2.4% |
| ACLS | SELL | 2022-03-16 | 2022-03-16 | $69.23 | $762K | +10.8% | -20.3% | -21.6% |
| ACLS | SELL | 2021-11-11 | 2021-11-12 | $62.06 | $62K | +4.2% | +2.1% | +14.7% |
| ACLS | SELL | 2021-03-11 | 2021-03-12 | $39.39 | $3.0M | -8.5% | +8.6% | +2.9% |
| NDSN | SELL | 2020-10-06 | 2020-10-08 | $198.12 | $732K | +3.7% | +0.3% | +1.8% |
| NDSN | SELL | 2020-05-27 | 2020-05-28 | $179.09 | $371K | +9.8% | +1.6% | +5.7% |
| ACLS | SELL | 2020-05-08 | 2020-05-08 | $26.13 | $2.0M | -1.2% | +7.1% | +0.0% |
| ACLS | SELL | 2020-02-12 | 2020-02-13 | $28.51 | $3.0M | -17.0% | -41.8% | -14.0% |
| ACLS | SELL | 2019-12-05 | 2019-12-05 | $22.43 | $815K | +3.4% | +5.2% | +5.1% |
| ACLS | SELL | 2019-11-20 | 2019-11-20 | $22.36 | $488K | -2.1% | +12.8% | +26.4% |
| ACLS | SELL | 2019-11-18 | 2019-11-20 | $22.52 | $2.4M | -2.1% | +12.8% | +26.4% |
| ACLS | SELL | 2019-11-18 | 2019-11-20 | $22.60 | $961K | -2.1% | +12.8% | +26.4% |
| NDSN | SELL | 2019-05-28 | 2019-05-29 | $127.88 | $255K | +5.8% | +11.1% | +4.5% |
| NDSN | SELL | 2018-09-19 | 2018-09-19 | $145.44 | $868K | -5.4% | -15.5% | -20.0% |
| ACLS | SELL | 2017-05-10 | 2017-05-11 | $21.05 | $1.7M | +0.5% | +13.9% | -3.3% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.
| Total |
| $37.4M |
Shares reported on the most recent Form 4, priced at the 2026-08-07 close.