Axcelis Technologies, Inc. (ACLS) has 20 known insider and institutional holders on record. The largest holder is PUMA MARY G with 231,976 shares. Other notable holders include Low Russell and George Arthur L Jr.
Over the last 12 months, insiders have made 39 transactions in ACLS stock — 14 buys (valued at RSU Award) and 6 sells (valued at $856.66K). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
ACLS Insider Ownership
Top Holder
PUMA MARY G
231,976 shares
Buys (12 mo)
14
$0.00 value
Sells (12 mo)
6
$856.66K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Puma Mary G |
Executive Chairperson |
231,976 |
2024-05-13 |
|
| 2 |
Low Russell |
President and CEO |
132,282 |
2026-04-02 |
|
| 3 |
George Arthur L Jr |
Director |
58,936 |
2021-05-17 |
|
| 4 |
Aldeborgh John E |
EVP, Customer Operations |
37,246 |
2021-02-18 |
|
| 5 |
Coogan James Gordon |
EVP and CFO |
37,144 |
2026-03-03 |
|
| 6 |
Kurtzweil John T |
Director |
35,050 |
2025-05-21 |
|
| 7 |
Faubert Richard J |
Director |
33,625 |
2022-08-12 |
|
| 8 |
Redinbo Greg |
EVP Marketing and Applications |
31,938 |
2026-03-03 |
|
| 9 |
Nettles Patrick H |
Director |
31,360 |
2017-05-17 |
|
| 10 |
Bintz William J |
EVP, Product Development |
31,173 |
2022-11-23 |
|
| 11 |
Fallon Lynnette C |
Executive VP, HR/legal |
27,323 |
2025-01-07 |
|
| 12 |
Evans Eileen |
EVP, General Counsel and Sec'y |
24,406 |
2025-12-18 |
|
| 13 |
Tatnall Christopher |
EVP Global Customer Operations |
23,183 |
2026-03-03 |
|
| 14 |
Brewer Kevin J |
EVP & Chief Financial Officer |
19,597 |
2024-01-02 |
|
| 15 |
Blumenstock Gerald M |
EVP, Research, Dev. & Eng. |
17,540 |
2026-03-03 |
|
| 16 |
St Dennis Thomas |
Director |
17,155 |
2025-05-15 |
|
| 17 |
Lawson Douglas A. |
EVP, Corporate Mktg & Strategy |
15,808 |
2024-06-24 |
|
| 18 |
Mahoney Robert John |
EVP Global Operations |
14,633 |
2026-03-03 |
|
| 19 |
Quirk Jeanne |
Director |
11,749 |
2025-05-15 |
|
| 20 |
Chiu Tzu Yin |
Director |
10,403 |
2025-05-15 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-01 |
Low Russell |
President and CEO |
Informative Sell |
1,244 |
$94.06 |
$117.01K |
| 2026-03-24 |
Low Russell |
President and CEO |
Informative Sell |
1,244 |
$90.00 |
$111.96K |
| 2026-03-12 |
Sutton Todd |
VP Corporate Controller |
Unknown |
- |
- |
- |
| 2026-03-12 |
Ryzhik David |
SVP Interim CFO |
Unknown |
- |
- |
- |
| 2026-03-02 |
Mahoney Robert John |
EVP Global Operations |
Tax Withholding of RSU |
573 |
$86.58 |
$49.61K |
| 2026-03-02 |
Tatnall Christopher |
EVP Global Customer Operations |
Tax Withholding of RSU |
1,121 |
$86.58 |
$97.06K |
| 2026-03-02 |
Blumenstock Gerald M |
EVP, Research, Dev. & Eng. |
Tax Withholding of RSU |
1,121 |
$86.58 |
$97.06K |
| 2026-03-02 |
Redinbo Greg |
EVP Marketing and Applications |
Tax Withholding of RSU |
723 |
$86.58 |
$62.6K |
| 2026-03-02 |
Coogan James Gordon |
EVP and CFO |
Tax Withholding of RSU |
1,800 |
$86.58 |
$155.84K |
| 2026-03-02 |
Low Russell |
President and CEO |
Tax Withholding of RSU |
5,227 |
$86.58 |
$452.55K |
| 2026-02-20 |
Titinger Jorge |
Director |
Informative Sell |
1,000 |
$80.00 |
$80K |
| 2026-01-15 |
Mahoney Robert John |
EVP Global Operations |
RSU Award |
1,734 |
- |
- |
| 2025-12-19 |
Mahoney Robert John |
EVP Global Operations |
Unknown |
- |
- |
- |
| 2025-12-16 |
Evans Eileen |
EVP, General Counsel and Sec'y |
Tax Withholding of RSU |
1,378 |
$86.32 |
$118.95K |
| 2025-12-17 |
Titinger Jorge |
Director |
Informative Sell |
2,000 |
$86.05 |
$172.1K |
| 2025-12-11 |
Blumenstock Gerald M |
EVP, Research, Dev. & Eng. |
Informative Sell |
3,034 |
$89.46 |
$271.42K |
| 2025-10-16 |
Coogan James Gordon |
EVP and CFO |
Tax Withholding of RSU |
713 |
$83.62 |
$59.62K |
| 2025-09-15 |
Tatnall Christopher |
EVP Global Customer Operations |
Tax Withholding of RSU |
137 |
$87.30 |
$11.96K |
| 2025-09-15 |
Redinbo Greg |
EVP Marketing and Applications |
Tax Withholding of RSU |
208 |
$87.30 |
$18.16K |
| 2025-06-16 |
Blumenstock Gerald M |
EVP, Research, Dev. & Eng. |
Tax Withholding of RSU |
506 |
$68.96 |
$34.89K |
| 2025-06-16 |
Redinbo Greg |
EVP Marketing and Applications |
Tax Withholding of RSU |
734 |
$68.96 |
$50.62K |
| 2025-05-20 |
Kurtzweil John T |
Director |
Informative Sell |
1,682 |
$61.93 |
$104.17K |
| 2025-05-16 |
Redinbo Greg |
EVP Marketing and Applications |
Tax Withholding of RSU |
190 |
$61.58 |
$11.7K |
| 2025-05-17 |
Low Russell |
President and CEO |
Tax Withholding of RSU |
947 |
$62.01 |
$58.72K |
| 2025-05-16 |
Low Russell |
President and CEO |
Tax Withholding of RSU |
712 |
$61.58 |
$43.84K |
