Gerald M. Blumenstock, EVP of Research, Development and Engineering at Axcelis Technologies Inc. ($ACLS), sold shares once on the open market in the last year, totaling about $271 thousand. His most recent sale occurred on December 11, 2025. This places him 7,780th out of nearly 12,000 insiders by sale value, well below the average of $8.6 million across about six transactions per insider. He made no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 2, 2026 | AXCELIS TECHNOLOGIES INC | $ACLS | Blumenstock Gerald M | EVP, Research, Dev. & Eng. | F | Common Stock | 1121 | $86.58 | 17,540.0000 | 31,668,000 | 6.01% | 0.00% |
| Dec. 11, 2025 | AXCELIS TECHNOLOGIES INC | $ACLS | Blumenstock Gerald M | EVP, Research, Dev. & Eng. | S | Common Stock | 3034 | $89.46 | 18,661.0000 | 31,450,000 | 13.98% | 0.01% |
| June 16, 2025 | AXCELIS TECHNOLOGIES INC | $ACLS | Blumenstock Gerald M | EVP, Research, Dev. & Eng. | F | Common Stock | 506 | $68.96 | 21,695.0000 | 32,335,000 | 2.28% | 0.00% |
| May 15, 2025 | AXCELIS TECHNOLOGIES INC | $ACLS | Blumenstock Gerald M | EVP, Research, Dev. & Eng. | F | Common Stock | 345 | $62.67 | 22,201.0000 | 32,335,000 | 1.53% | 0.00% |
| May 15, 2025 | AXCELIS TECHNOLOGIES INC | $ACLS | Blumenstock Gerald M | EVP, Research, Dev. & Eng. | A | Common Stock | 6148 | $0.00 | 22,546.0000 | 32,335,000 | 37.49% | 0.02% |
| May 15, 2025 | AXCELIS TECHNOLOGIES INC | $ACLS | Blumenstock Gerald M | EVP, Research, Dev. & Eng. | A | Common Stock | 6148 | $0.00 | 16,398.0000 | 32,335,000 | 59.98% | 0.02% |
| Feb. 28, 2025 | AXCELIS TECHNOLOGIES INC | $ACLS | Blumenstock Gerald M | EVP, Research, Dev. & Eng. | F | Common Stock | 748 | $54.79 | 10,250.0000 | 32,704,000 | 6.80% | 0.00% |
| June 17, 2024 | AXCELIS TECHNOLOGIES INC | $ACLS | Blumenstock Gerald M | EVP, Engineering | F | Common Stock | 308 | $138.02 | 9,572.0000 | 32,926,000 | 3.12% | 0.00% |
| May 15, 2024 | AXCELIS TECHNOLOGIES INC | $ACLS | Blumenstock Gerald M | EVP, Engineering | A | Common Stock | 2849 | $0.00 | 7,031.0000 | 32,926,000 | 68.13% | 0.01% |
| May 15, 2024 | AXCELIS TECHNOLOGIES INC | $ACLS | Blumenstock Gerald M | EVP, Engineering | A | Common Stock | 2849 | $0.00 | 9,880.0000 | 32,926,000 | 40.52% | 0.01% |
| June 15, 2023 | AXCELIS TECHNOLOGIES INC | $ACLS | Blumenstock Gerald M | EVP, Engineering | A | Common Stock | 4182 | $0.00 | 4,182.0000 | 33,293,000 | 9999.99% | 0.01% |