Blumenstock Gerald M

SEC source: 0001979418-26-000010 · form4-06162026_050601.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,987

F2 · price: Represents the closing price of the common stock on the date of the tax withholding.

F1 · acquired: This forfeiture of shares for tax withholding purposes relates to the vesting on June 15, 2026 of service vesting restricted stock units granted to the executive in June 2023. The shares issued to the executive following the vesting were reduced by a number of shares having a value equal to the executive's tax withholding obligation with respect to the vested restricted stock units.

F3 · balance_after: Of the shares held after this vesting event on June 15, 2026, 19,447 shares are issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001979418-26-000008 · form4-05222026_050501.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,493

F1 · balance_after: Of the shares held after this sale on May 21, 2026, 20,493 shares were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001979418-26-000006 · form4-05192026_050508.xml · nonDerivative · entry 4

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,654

F6 · price: Represents the closing price of the common stock on the date of the tax withholding.

F8 · acquired: This forfeiture of shares for tax withholding purposes relates to the vesting on May 15, 2026 of service vesting restricted stock units granted to the executive in May 2024. The shares issued to the executive on the vesting were reduced by a number of shares having a value equal to the executive's tax withholding obligation with respect to the vested restricted stock units.

F9 · balance_after: Of the shares held after this vesting event on May 15, 2026, 20,493 shares were issuable on vesting of restricted stock units granted to the executive under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001979418-26-000006 · form4-05192026_050508.xml · nonDerivative · entry 3

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,999

F6 · price: Represents the closing price of the common stock on the date of the tax withholding.

F5 · acquired: This forfeiture of shares for tax withholding purposes relates to the vesting on May 15, 2026 of service vesting restricted stock units granted to the executive in May 2025. The shares issued to the executive on the vesting were reduced by a number of shares having a value equal to the executive's tax withholding obligation with respect to the vested restricted stock units.

F7 · balance_after: Of the shares held after this vesting event on May 15, 2026, 21,206 shares were issuable on vesting of restricted stock units granted to the executive under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001979418-26-000006 · form4-05192026_050508.xml · nonDerivative · entry 2

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,743

F3 · price: These shares are issuable on vesting of restricted stock units granted under the Company's 2012 Equity Incentive Plan on May 15, 2026. In this grant, the executive may earn shares of common stock, ranging from zero to 200% of the granted units. The shares are earned based on the achievement of performance goals based on relative total shareholder return over a performance period of January 1, 2026 to December 31, 2028. Assuming continuation of employment, 100% of the earned shares will vest on measurement of performance in 2029. Unearned restricted stock units will forfeit at such time.

F4 · balance_after: Of the shares held after this grant on May 15, 2026, 22,743 shares were issuable on vesting of restricted stock units granted to the executive under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001979418-26-000006 · form4-05192026_050508.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,018

F1 · price: These shares are issuable on vesting of restricted stock units granted under the Company's 2012 Equity Incentive Plan on May 15, 2026. Assuming continuation of employment, these restricted stock units will vest as to one-third of the shares granted on each of May 15, 2027, May 15, 2028, and May 15, 2029.

F2 · balance_after: Of the shares held following this grant on May 15, 2026, 20,018 were issuable on vesting of restricted stock units granted to the executive under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001979418-26-000004 · form4-05152026_050501.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,293

F1 · balance_after: Of the shares held after this sale on May 14, 2026, 17,293 shares were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture. This amount includes restricted stock units earned by the reporting person upon the achievement of 112.5% of the restricted stock units granted in 2025 based upon the achievement of 2025 performance goals.

SEC source: 0001979418-26-000002 · form4-03032026_050310.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,540

F2 · price: Represents the closing price of the Company's common stock on March 2, 2026, the date of the tax withholding.

F1 · acquired: This forfeiture of shares for tax withholding purposes relates to the vesting on February 28, 2026 of performance-based restricted stock units ("2024 PRSUs") granted to the executive in May 2024. Of the 2024 PRSUs granted, 150% were determined to be earned by the executive pursuant to a resolution of the Axcelis Technologies, Inc. Compensation Committee on February 13, 2025, with half of the earned shares vesting on February 28, 2025 and the remaining half of the earned shares vesting on February 28, 2026. The shares issued to the executive on the vesting were reduced by a number of shares having a value equal to the executive's tax withholding obligation with respect to the vested 2024 PRSUs.

F3 · balance_after: Of the shares held after the vesting of the remaining 2024 PRSUs, 16,525 were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001979418-25-000004 · form4-12122025_051201.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,661

F1 · price: The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $89.39 to $89.46, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

F2 · balance_after: Of the shares held after this sale on December 11, 2025, 18,661 shares were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001415889-25-017561 · form4-06172025_050606.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,695

F2 · price: Represents the closing price of the common stock on the date of the tax withholding.

F1 · acquired: This forfeiture of shares for tax withholding purposes relates to the vesting on June 15, 2025 of service vesting restricted stock units granted to the executive in June 2023. The shares issued to the executive following the vesting were reduced by a number of shares having a value equal to the executive's tax withholding obligation with respect to the vested restricted stock units.

F3 · balance_after: Of the shares held after this vesting event on June 15, 2025, 18,661 shares are issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001415889-25-013643 · form4-05192025_040518.xml · nonDerivative · entry 3

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,201

F6 · price: Represents the closing price of the common stock on the date of the tax withholding.

F5 · acquired: This forfeiture of shares for tax withholding purposes relates to the vesting on May 15, 2025 of the restricted stock units ("RSUs") granted to the executive in May 2024. As agreed with the executive, the shares issued to the executive on the vesting were reduced by a number of shares having a value equal to the executive's tax withholding obligation with respect to the vested RSUs.

F7 · balance_after: Of the shares held after this vesting event on May 15, 2025, 19,706 shares were issuable on vesting of restricted stock units granted to the executive under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001415889-25-013643 · form4-05192025_040518.xml · nonDerivative · entry 2

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,546

F3 · price: These shares are issuable on vesting of restricted stock units granted under the Company's 2012 Equity Incentive Plan on May 15, 2025. In this grant, the executive may earn shares of common stock, ranging from zero to 150% of the granted units. The shares are earned based on the achievement of 2025 performance goals. Assuming continuation of employment, 50% of the earned shares will vest on February 28, 2027, and 50% of the earned shares will vest on February 28, 2028. Unearned restricted stock units will forfeit on February 28, 2026.

F4 · balance_after: Of the shares held after this grant on May 15, 2025, 20,418 shares were issuable on vesting of restricted stock units granted to the executive under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001415889-25-013643 · form4-05192025_040518.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,398

F1 · price: These shares are issuable on vesting of restricted stock units granted under the Company's 2012 Equity Incentive Plan on May 15, 2025. Assuming continuation of employment, these restricted stock units will vest as to 25% of the shares granted on each of May 15, 2026, May 15, 2027, May 15, 2028, and May 15, 2029.

F2 · balance_after: Of the shares held following this grant on May 15, 2025, 14,270 were issuable on vesting of restricted stock units granted to the executive under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001415889-25-006551 · form4-03042025_040330.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Research, Dev. & Eng.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,250

F1 · kind: This forfeiture of shares for tax withholding purposes relates to the vesting on February 28, 2025 of performance based restricted stock units ("2024 PRSUs") granted to the executive in May 2024. Of the 2024 PRSUs granted, 150% were determined to be earned by the executive pursuant to a resolution of the Axcelis Technologies, Inc. Compensation Committee on February 13, 2025, and half of the earned shares vested on February 28, 2025. As agreed with the executive, the shares issued to the executive on the vesting were reduced by a number of shares having a value equal to the executive's tax withholding obligation with respect to the vested 2024 PRSUs.

F2 · price: Represents the closing price of the Company's common stock on February 28, 2025, the date of the tax withholding.

F3 · balance_after: Of the shares held as of February 28, 2025 after the vesting of the 2024 PRSUs, 8,122 were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001415889-24-017399 · form4-06182024_040639.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Engineering

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,572

F2 · price: Represents the closing price of the common stock on the date of the tax withholding.

F1 · acquired: This forfeiture of shares for tax withholding purposes relates to the vesting on June 17, 2024 of service vesting restricted stock units granted to the executive in June 2023. As agreed with the executive, the shares issued to the executive on the vesting were reduced by a number of shares having a value equal to the executive's tax withholding obligation with respect to the vested restricted stock units.

F3 · balance_after: Of the shares held after this forfeiture event on June 17, 2024, 8,835 were issuable on vesting of restricted stock units granted to the reporting person under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001415889-24-013229 · form4-05152024_040547.xml · nonDerivative · entry 2

Blumenstock Gerald M · CIK 0001979418 · EVP, Engineering

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,880

F3 · price: These shares are issuable on vesting of restricted stock units granted under the Company's 2012 Equity Incentive Plan on May 15, 2024. In this grant, the executive may earn shares of common stock, ranging from zero to 150% of the granted units. The shares are earned based on the achievement of 2024 performance goals. Assuming continuation of employment, 50% of the earned shares will vest on February 28, 2025, and 50% of the earned shares will vest on February 28, 2026. Unearned restricted stock units will forfeit on February 28, 2025.

F4 · balance_after: Of the shares held after this grant on May 15, 2024, 9,880 shares were issuable on vesting of restricted stock units granted to the executive under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001415889-24-013229 · form4-05152024_040547.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Engineering

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,031

F1 · price: These shares are issuable on vesting of restricted stock units granted under the Company's 2012 Equity Incentive Plan on May 15, 2024. Assuming continuation of employment, these restricted stock units will vest as to 25% of the shares granted on each of May 15, 2025, May 15, 2026, May 15, 2027, and May 15, 2028.

F2 · balance_after: Of the shares held following this grant on May 15, 2024, 7,031 were issuable on vesting of restricted stock units granted to the executive under the 2012 Equity Incentive Plan and are subject to forfeiture.

SEC source: 0001209191-23-037305 · doc4.xml · nonDerivative · entry 1

Blumenstock Gerald M · CIK 0001979418 · EVP, Engineering

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,182

F1 · price: These shares are issuable on vesting of restricted stock units granted under the Company's 2012 Equity Incentive Plan. Assuming continuation of employment, 25% of these restricted stock units will vest on each of June 15, 2024, June 15, 2025, June 15, 2026 and June 15, 2027.

F2 · balance_after: Of the shares held after this grant on June 15, 2023, 4,182 were issuable on vesting of restricted stock units granted to the executive under the 2012 Equity Incentive Plan and are subject to forfeiture.