Axcelis Technologies Inc Form 4 Filings

Axcelis Technologies Inc. (ACLS) reported that executive vice president of Global Customer Operations Christopher Tatnall had 136 shares of common stock withheld on September 15, 2026, to satisfy tax liabilities arising from the vesting of restricted stock units granted in September 2023. The shares were valued at the $105.04 closing price on that date. After this vesting event, Tatnall holds 27,491 shares directly, including 20,590 shares issuable upon future vesting of restricted stock units that remain subject to forfeiture.

Axcelis Technologies SVP Interim CFO David Ryzhik reported two tax-withholding dispositions of common stock on July 15, 2026. In total, 221 shares were forfeited at $145.01 per share to satisfy taxes due on the vesting of restricted stock units granted in July 2024. He continues to hold Axcelis shares and unvested restricted stock units that remain subject to forfeiture.

Axcelis Technologies SVP and Interim CFO David Ryzhik reported a routine tax-withholding share disposition tied to equity compensation. On June 16, 2026, 76 shares of common stock were withheld at a price of $176.845 per share to cover taxes on vesting restricted stock units granted in June 2025.

After this vesting event, Ryzhik directly held 9,955 shares, including 8,439 shares issuable upon future vesting of restricted stock units under the 2012 Equity Incentive Plan that remain subject to forfeiture. The transaction reflects tax withholding rather than an open-market sale.

AXCELIS TECHNOLOGIES INC executive Gerald M. Blumenstock had 506 common shares withheld for taxes tied to vesting restricted stock units. On June 15, 2026, shares from RSUs granted in June 2023 vested, and part of the issued shares was forfeited to satisfy his tax withholding obligation.

After this tax-withholding disposition, he directly holds 19,987 common shares. Footnotes state that 19,447 additional shares are issuable upon future vesting of restricted stock units under the 2012 Equity Incentive Plan and remain subject to forfeiture.

Axcelis Technologies director Necip Sayiner sold common stock in an open-market transaction. On June 3, 2026, he sold 1,586 shares at a weighted-average price of $157.4422 per share, with individual trade prices ranging from $157.41 to $157.71. Following this sale, he directly holds 7,112 shares of Axcelis common stock. Of these holdings, 2,110 shares are issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan and remain subject to forfeiture.

Axcelis Technologies EVP Global Operations Robert John Mahoney sold shares of company stock in an open-market trade. On June 2, 2026, he sold 1,155 shares of common stock at an average price of $155.24 per share.

After this sale, he directly holds 14,410 shares, including 12,578 shares issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan, which remain subject to forfeiture. The transaction modestly reduces his direct common stock position while leaving a substantial equity stake tied to both owned shares and unvested awards.

Axcelis Technologies executive Todd Sutton, VP Corporate Controller, reported an open-market sale of 2,000 shares of common stock on May 27, 2026 at $159.99 per share. Following this transaction, he directly holds 6,360 shares, including 4,582 shares that are issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan and subject to forfeiture. This filing shows a relatively small insider sale alongside a meaningful portion of unvested equity awards that continue to tie his compensation to the company’s future performance.

Axcelis Technologies director Thomas St. Dennis reported an open-market sale of 900 shares of common stock at $155.37 per share on May 22, 2026.

After this transaction he held 17,695 shares, including 1,440 shares issuable upon vesting of restricted stock units that remain subject to forfeiture.

AXCELIS TECHNOLOGIES INC executive Eileen Evans reported an open-market sale of 926 shares of Common Stock. The transaction occurred on May 22, 2026 at a price of $155.5053 per share. After the sale, she directly held 31,295 shares.

According to a footnote, 29,823 of the shares held after this sale are issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan and remain subject to forfeiture. This indicates most of her reported position consists of unvested equity awards rather than fully vested, unrestricted shares.

Axcelis Technologies executive vice president Gerald M. Blumenstock sold 1,161 shares of common stock in an open-market transaction at $152.70 per share on May 21, 2026. After this sale, a total of 20,493 shares are reported as issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan and remain subject to forfeiture.

Axcelis Technologies executive Christopher Tatnall reported an open-market sale of company stock. On May 20, 2026, the EVP Global Customer Operations sold 1,166 shares of Axcelis common stock at $149.75 per share.

After this transaction, he directly held 27,627 shares. According to the footnote, 20,871 of these shares are issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan and remain subject to forfeiture.

Axcelis Technologies director Gregory B. Graves reported selling 3,225 shares of common stock on May 19, 2026 in two open-market transactions. He sold 2,625 shares at a weighted-average price of $141.4051 per share and 600 shares at a weighted-average price of $142.5146 per share. The prices reflect multiple trades within narrow ranges around those averages. Following these sales, he continues to hold shares, including 2,110 shares issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan, which remain subject to forfeiture.

Axcelis Technologies director John T. Kurtzweil reported an open-market sale of 3,500 shares of common stock on May 19, 2026 at a weighted-average price of $138.7917 per share. After the sale, he directly holds 32,990 shares, including 1,440 shares issuable upon vesting of restricted stock units that remain subject to forfeiture.

Axcelis Technologies director Jeanne Quirk executed an open-market sale of 1,789 shares of Common Stock at $140.22 per share. After this transaction, she directly holds 11,400 shares, including 1,440 shares issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan that remain subject to forfeiture.

Axcelis Technologies VP Corporate Controller Todd Sutton reported a routine tax-withholding event related to restricted stock units. On May 18, 2026, 184 shares of common stock were forfeited to cover taxes from RSUs that vested on May 16, 2026 at a price of $146.24 per share. After this event, Sutton held 8,360 shares directly, including 4,582 shares issuable upon future vesting of restricted stock units under the 2012 Equity Incentive Plan.

Axcelis Technologies EVP Global Operations Robert John Mahoney reported routine share dispositions tied to equity compensation. A total of 312 shares of common stock were withheld on May 18, 2026 to cover tax obligations arising from the May 16, 2026 vesting of restricted stock units granted in May 2022. The withholding price matched the common stock’s closing price of $146.24 per share. These transactions were tax-withholding events, not open-market purchases or sales.

Axcelis Technologies executive Greg Redinbo reported routine tax-withholding transactions, not open-market trades. On tax-withholding related to the May 16, 2026 vesting of restricted stock units granted in May 2022, 190 shares of common stock were forfeited at a price of $146.24 per share to cover his tax liability. Footnotes note that tens of thousands of additional shares are issuable upon future vesting of restricted stock units under the 2012 Equity Incentive Plan and remain subject to forfeiture.

Axcelis Technologies President and CEO Russell Low reported a routine tax-related share disposition. On May 18, 2026, 711 shares of common stock were withheld at $146.24 per share to satisfy tax obligations from the vesting of restricted stock units granted in May 2022.

After this event, Low directly held 154,900 shares. Footnotes state that 106,691 of the shares held after the May 16, 2026 vesting date are issuable upon future vesting of restricted stock units under the 2012 Equity Incentive Plan and remain subject to forfeiture.

Axcelis Technologies VP Corporate Controller Todd Sutton reported routine equity compensation and related tax withholding transactions in common stock. On May 15, 2026, he received a grant of 1,168 restricted stock units under the 2012 Equity Incentive Plan, which will vest in three equal annual installments starting in 2027. On the same date, a total of 441 shares of common stock were forfeited at $155.18 per share to satisfy tax withholding obligations tied to previously granted restricted stock units. Following these events, Sutton directly held 8,544 shares of Axcelis common stock.

Axcelis Technologies senior vice president and interim CFO David Ryzhik received a 3,115-share award of common stock on May 15, 2026, at no cash cost, in the form of restricted stock units scheduled to vest in three equal annual installments on May 15, 2027, 2028, and 2029. On the same date, 226 shares were withheld and forfeited at $155.18 per share to cover tax obligations from a prior restricted stock unit vesting. After these equity events, he held 10,031 shares of common stock directly, with footnotes indicating that many additional shares are issuable upon future vesting and subject to forfeiture, and the transactions were not reported as conducted under a Rule 10b5-1 trading plan.

Axcelis Technologies EVP Global Operations Robert John Mahoney reported routine equity compensation activity and related tax withholding on May 15, 2026. He received two grants of 1,947 shares of common stock each as restricted stock units under the company’s 2012 Equity Incentive Plan.

The service-vesting RSUs are scheduled to vest in three equal annual installments starting May 15, 2027, while performance-based RSUs may earn from zero to 200% of granted units based on relative total shareholder return for January 1, 2026 to December 31, 2028, vesting after performance is measured in 2029. To cover tax obligations from vesting of prior RSU grants made in 2023, 2024, and 2025, a total of 776 shares were forfeited at a reference price of $155.18 per share, which represents tax-withholding dispositions rather than open-market sales. Mahoney continues to hold common stock, including shares issuable upon future RSU vesting that remain subject to forfeiture.

AXCELIS TECHNOLOGIES INC EVP Gerald M. Blumenstock reported compensation-related stock activity, not open-market trading. On May 15, 2026, he received two grants of 2,725 shares each of common stock as restricted stock units under the company’s 2012 Equity Incentive Plan.

One RSU grant vests in three equal annual installments in 2027, 2028, and 2029, subject to continued employment. The other is a performance-based RSU award tied to relative total shareholder return from January 1, 2026 to December 31, 2028, with 0–200% of the granted units potentially earned and vesting in 2029.

Also on May 15, 2026, a total of 1,089 shares of common stock (345 shares and 744 shares) were forfeited to cover tax withholding obligations upon the vesting of earlier RSU awards granted in 2024 and 2025. These dispositions were for tax payments at a price of $155.18 per share, the closing price on the tax-withholding date, and do not represent open-market sales.

Axcelis Technologies EVP Christopher Tatnall reported routine equity compensation and related tax withholding transactions. On May 15, 2026, he received two awards of 3,504 shares each of restricted stock units under the 2012 Equity Incentive Plan. One grant is scheduled to vest in three equal parts on May 15, 2027, May 15, 2028, and May 15, 2029, assuming continued employment.

The other grant is performance-based, with shares earned between 0% and 200% of the granted units based on relative total shareholder return for the period from January 1, 2026 to December 31, 2028, vesting after performance is measured in 2029. The filing also shows dispositions of 1,259 shares at $155.18 per share to cover tax withholding on previously granted restricted stock units, which were not open-market sales.

Axcelis Technologies EVP Greg Redinbo reported new equity awards and routine tax withholding transactions. On May 15, 2026, he received two grants of 3,115 shares of common stock each as restricted stock units under the 2012 Equity Incentive Plan. One grant vests in three annual installments in 2027, 2028, and 2029, while the other can earn from 0%–200% of the granted units based on relative total shareholder return for January 1, 2026–December 31, 2028, with earned shares vesting in 2029. The filing also records forfeitures totaling 839 shares at $155.18 per share to satisfy tax withholding on previously granted RSUs that vested in 2023–2025. After these events, Redinbo continues to hold more than 32,000 shares of Axcelis common stock, including a significant number of unvested RSUs subject to forfeiture.

Axcelis Technologies EVP and General Counsel Eileen Evans reported compensation-related equity activity. On May 15, 2026, she received two awards of restricted stock units covering a total of 7,786 shares of common stock under the 2012 Equity Incentive Plan, including a performance-based grant that can pay out from zero to 200% of granted units based on relative total shareholder return for 2026–2028. On the same date, 867 shares were withheld at $155.18 per share to cover tax obligations on previously granted restricted stock units that vested, a non-market tax-withholding disposition rather than an open-market sale.

Axcelis Technologies President and CEO Russell Low reported equity compensation and related tax events in company stock. On May 15, 2026 he received two grants of 19,466 restricted stock units each under the 2012 Equity Incentive Plan, including a performance-based award tied to relative total shareholder return through December 31, 2028. The filing also shows 6,891 shares of common stock were withheld at $155.18 per share to satisfy tax obligations on previously granted restricted stock units that vested on the same date.

Titinger Jorge reported acquisition or exercise transactions in this Form 4 filing.

Axcelis Technologies director Jorge Titinger received an equity award in the form of restricted stock units. On May 15, 2026, he was granted 1,440 shares of common stock at no purchase price under the company’s 2012 Equity Incentive Plan. These restricted stock units are scheduled to vest on May 15, 2027, assuming he completes his current Board term, and are subject to forfeiture until they vest. Following this award, Titinger beneficially holds 5,917 shares of Axcelis common stock, including the 1,440 unvested restricted stock units.

St Dennis Thomas reported acquisition or exercise transactions in this Form 4 filing.

Axcelis Technologies director Thomas St. Dennis reported an equity award of 1,440 shares of common stock in the form of restricted stock units. The award was granted at no cash cost on May 15, 2026 under the company’s 2012 Equity Incentive Plan as compensation for board service.

These restricted stock units are scheduled to vest on May 15, 2027, assuming he completes his current term on the Board of Directors, and are subject to forfeiture until they vest. Following this grant, St. Dennis directly holds 18,595 shares of common stock, including the 1,440 unvested units.

Sayiner Necip reported acquisition or exercise transactions in this Form 4 filing.

Axcelis Technologies director Necip Sayiner reported an equity compensation grant. He was awarded 1,440 shares of common stock in the form of restricted stock units under the company’s 2012 Equity Incentive Plan on May 15, 2026. These units will vest on May 15, 2027, assuming he completes his current Board term. Following the award, he directly holds 8,698 shares, and of the shares held as of May 15, 2026, 2,110 are restricted stock units that remain subject to forfeiture.

Quirk Jeanne reported acquisition or exercise transactions in this Form 4 filing.

Axcelis Technologies director Jeanne Quirk received a grant of 1,440 shares of Common Stock in the form of restricted stock units at no cash cost. These units were granted under the company’s 2012 Equity Incentive Plan and will vest on May 15, 2027, assuming she completes her current Board term. After this grant, she directly holds 13,189 shares, including 1,440 unvested units that are subject to forfeiture.

KURTZWEIL JOHN T reported acquisition or exercise transactions in this Form 4 filing.

Axcelis Technologies director John T. Kurtzweil received an equity award rather than buying shares on the market. He was granted 1,440 shares of common stock in the form of restricted stock units at no cost on May 15, 2026, under the company’s 2012 Equity Incentive Plan. These units are subject to forfeiture and will vest on May 15, 2027 if he completes his current Board term. After this award, he holds 36,490 shares of Axcelis common stock directly, including the unvested restricted stock units.

GRAVES GREGORY B reported acquisition or exercise transactions in this Form 4 filing.

Axcelis Technologies director Gregory B. Graves reported an equity award of 1,440 shares of Common Stock in the form of restricted stock units. The award was granted on May 15, 2026 at no cash cost and will vest on May 15, 2027, assuming he completes his current Board term.

Following this grant, Graves’ reported holdings total 8,698 shares of Common Stock. Of the shares held as of May 15, 2026, 2,110 shares are also in the form of restricted stock units granted under the 2012 Equity Incentive Plan and remain subject to forfeiture.

Chiu Tzu Yin reported acquisition or exercise transactions in this Form 4 filing.

Axcelis Technologies director Tzu Yin Chiu received a grant of 1,440 shares of Common Stock in the form of restricted stock units (RSUs). The RSUs were granted on May 15, 2026 at no cash cost and are scheduled to vest on May 15, 2027 assuming completion of the director’s current Board term. After this award, the director holds 11,843 shares directly, including 1,440 unvested RSUs that are subject to forfeiture.

Axcelis Technologies VP Corporate Controller Todd Sutton reported an open-market sale of 2,574 shares of common stock at a weighted-average price of $163.8946 per share, in multiple trades between $163.8067 and $164.1301. After this May 14, 2026 sale, he holds 7,817 shares directly, including 5,538 shares issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan that remain subject to forfeiture.

Axcelis Technologies executive Gerald M. Blumenstock, EVP of Research, Development & Engineering, reported an open-market sale of 1,015 shares of common stock on May 14, 2026 at an average price of $162.315 per share. Following this sale, he is shown with 17,293 shares that are issuable upon vesting of restricted stock units under the 2012 Equity Incentive Plan, all of which are subject to forfeiture. The footnote notes this amount includes restricted stock units earned based on achieving 112.5% of his 2025 performance-based restricted stock unit grant tied to 2025 performance goals.

Axcelis Technologies director Jorge Titinger reported an open-market sale of 2,000 shares of common stock on May 13, 2026 at a price of $164.14 per share. After this transaction, he directly held 4,477 shares, including 3,586 shares issuable upon vesting of restricted stock units that remain subject to forfeiture.

Axcelis Technologies EVP Greg Redinbo sold shares in an open-market transaction. On May 13, 2026, he sold 2,883 shares of common stock at $160.85 per share. After the sale, he held 29,823 shares, including 17,752 shares issuable upon vesting of restricted stock units that remain subject to forfeiture.

Axcelis Technologies EVP Global Operations Robert John Mahoney reported an open-market sale of 2,258 shares of Axcelis common stock on May 12, 2026 at a price of $161.00 per share. After this sale, he directly holds 12,759 shares. A footnote explains that 10,927 of these shares are issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan and remain subject to forfeiture, including units earned at 112.5% of a 2025 grant based on 2025 performance goals.

Axcelis Technologies President and CEO Russell Low reported an open-market sale of 7,468 shares of Common Stock at $156.75 per share on May 6, 2026. The transaction was executed under a pre-arranged Rule 10b5-1 trading plan adopted on December 11, 2025.

After this sale, Low directly holds 123,570 shares, including 83,480 shares issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan that remain subject to forfeiture. This filing reflects a planned, partial reduction while maintaining a significant ongoing equity position.

Axcelis Technologies Inc. president and CEO Russell Low reported an open-market sale of 1,244 shares of common stock at $138.86 per share on May 1, 2026. The transaction was executed under a pre-arranged Rule 10b5-1 trading plan adopted on December 11, 2025.

After this sale, Low directly held 131,038 shares of Axcelis common stock. Of this amount, 83,480 shares were issuable upon vesting of restricted stock units granted under the company’s 2012 Equity Incentive Plan and remain subject to forfeiture.

Axcelis Technologies executive Christopher Tatnall had 907 shares of common stock withheld for taxes in connection with restricted stock units vesting. The tax withholding was valued at $131.02 per share, based on the closing price on the withholding date.

After this vesting and tax withholding, Tatnall directly holds 23,044 shares, including 16,463 shares issuable upon vesting of restricted stock units that remain subject to forfeiture under the company’s 2012 Equity Incentive Plan.

Axcelis Technologies president and CEO Russell Low executed an open-market sale of 1,244 shares of common stock at $94.06 per share on April 1, 2026. The transaction was made under a pre-arranged Rule 10b5-1 trading plan adopted on December 11, 2025.

Following this sale, Low directly holds 132,282 shares of Axcelis common stock. Of these, 83,480 shares are issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan and remain subject to forfeiture.

AXCELIS TECHNOLOGIES INC president and CEO Russell Low reported an open-market sale of 1,244 shares of common stock at $90.00 per share on March 24, 2026. After the sale, he directly holds 133,526 shares, including 83,480 shares issuable upon vesting of restricted stock units that remain subject to forfeiture.

The transaction was executed under a pre-arranged Rule 10b5-1 trading plan adopted on December 11, 2025, indicating it was scheduled in advance rather than timed discretionarily. Overall, the sale represents a small portion of his total reported holdings.

Axcelis Technologies executive vice president of global operations Robert John Mahoney reported a tax-withholding share disposition tied to vesting of performance-based restricted stock units. On March 2, 2026, 573 shares of common stock were forfeited at a price of $86.58 per share to satisfy tax obligations on 2024 PRSUs that vested on February 28, 2026. After this withholding, he beneficially owns 14,633 shares, including 10,543 shares issuable upon vesting of restricted stock units that remain subject to forfeiture.

Axcelis Technologies executive Gerald M. Blumenstock reported a tax-related share disposition. On March 2, he forfeited 1,121 shares of common stock at a price of $86.58 per share to cover tax withholding triggered by the February 28, 2026 vesting of previously granted performance-based restricted stock units. After this withholding, he directly holds 17,540 shares, including 16,525 shares issuable upon vesting of restricted stock units that remain subject to forfeiture.

Axcelis Technologies EVP Global Customer Operations Christopher Tatnall reported a tax-withholding disposition of 1,121 shares of common stock at $86.58 per share on March 2, 2026. The shares were withheld to cover taxes on vested 2024 performance-based restricted stock units. After this, Tatnall directly holds 23,183 shares, including 17,570 shares issuable upon future vesting of restricted stock units that remain subject to forfeiture.

Axcelis Technologies executive Greg Redinbo reported a tax-related share disposition. On March 2, 2026, he forfeited 723 shares of Axcelis common stock at $86.58 per share to cover tax withholding arising from the February 28, 2026 vesting of performance-based 2024 PRSUs.

After this tax-withholding disposition, he directly holds 31,938 shares, including 16,984 shares issuable upon vesting of restricted stock units granted under the 2012 Equity Incentive Plan, which remain subject to forfeiture.

Axcelis Technologies EVP and CFO James Gordon Coogan reported a tax-related share disposition. On March 2, 2026, 1,800 shares of common stock were forfeited at $86.58 per share to cover tax withholding from the February 28, 2026 vesting of 2024 performance-based RSUs. After this transaction, he directly held 37,144 shares, including 31,096 shares issuable upon vesting of restricted stock units that remain subject to forfeiture.

Axcelis Technologies President and CEO Russell Low reported a tax-related share disposition connected to the vesting of performance-based restricted stock units granted in May 2024. On the tax-withholding date, 5,227 shares of common stock were forfeited at $86.58 per share to cover tax obligations.

After this withholding, Low directly held 130,928 shares of Axcelis common stock, including 79,638 shares issuable upon vesting of restricted stock units that remain subject to forfeiture.