Results of Operations and Financial Condition On November 5, 2026, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter ended September 30, 2026. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

CFO — Jeroen Delsman: The filing announces the external hire of a permanent CFO to succeed an interim officer, which is a standard succession event rather than a sudden loss of a sitting executive.

Results of Operations and Financial Condition On August 6, 2026, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter ended June 30, 2026. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Results of Operations and Financial Condition On May 7, 2026, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter ended March 31, 2026. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Chief Financial Officer — James Coogan: James Coogan resigned as Chief Financial Officer, and David Ryzhik was appointed as Interim Chief Financial Officer.

Results of Operations and Financial Condition On February 17, 2026, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter and year ended December 31, 2025. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Other Events. As previously announced, on September 30, 2025, Axcelis Technologies, Inc., a Delaware corporation (“ Axcelis ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”), by and among Axcelis, Victory Merger Sub, Inc., Delaware corporation and a direct wholly owned subsidiary of Axcelis (“ Merger Sub ”) and Veeco Instruments Inc., a Delaware corporation (“ Veeco ”), pursuant to which, subject to the terms and conditions set forth therein, Merger Sub will be merge…

Other Events. As previously disclosed, on September 30, 2025, Veeco Instruments Inc., a Delaware corporation (“Veeco”), Axcelis Technologies, Inc., a Delaware corporation (“Axcelis”), and Victory Merger Sub, Inc., a Delaware corporation and a wholly-owned subsidiary of Axcelis (“Merger Sub”), entered into an Agreement and Plan of Merger (the “Merger Agreement”). Pursuant to the Merger Agreement, and subject to the satisfaction or waiver of the conditions specified therein, Merger Sub shall be…

Results of Operations and Financial Condition On November 4, 2025, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter ended September 30, 2025. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Other Events On October 1, 2025, Axcelis and Veeco jointly issued a press release announcing their entry into the Merger Agreement. The full text of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. Additional Information About the Potential Transaction and Where to Find It In connection with the proposed transaction, Axcelis and Veeco intend to prepare, and Axcelis intends to file with the SEC, a registration statement on Form S-4 that will include…

Entry into a Material Definitive Agreement. Agreement and Plan of Merger On September 30, 2025, Axcelis Technologies, Inc., a Delaware corporation (“ Axcelis ”), Victory Merger Sub, Inc., a Delaware corporation and a wholly-owned subsidiary of Axcelis (“ Merger Sub ”), and Veeco Instruments Inc., a Delaware corporation (“ Veeco ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”). Pursuant to the Merger Agreement, and subject to the satisfaction or waiver of the conditi…

Regulation FD Disclosure. On September 30 , 2025, Axcelis Technologies, Inc., a Delaware corporation (“ Axcelis ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”), by and among Axcelis, Victory Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Axcelis (“ Merger Sub ”), and Veeco Instruments Inc., a Delaware corporation (“ Veeco ”) . On October 1, 2025, copies of the documents furnished as Exhibits 99.1, 99.2, 99.3, 99.4, 99.5 and 99.6 were diss…

Results of Operations and Financial Condition On August 5, 2025, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter ended June 30, 2025. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

The filing discloses an amendment to the company's equity incentive plan to increase share reserves, which is a compensatory arrangement rather than a change in management personnel.

Results of Operations and Financial Condition On May 6, 2025, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter ended March 31, 2025. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Other Events. On March 12, 2025, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its stock repurchase program. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Results of Operations and Financial Condition On February 10, 2025, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter and year ended December 31, 2024. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Regulation FD Disclosure On December 2, 2024, U.S. Department of Commerce’s Bureau of Industry and Security (“BIS”) released new interim final rules adding new companies to the U.S. Entity List and further regulating the export of certain semiconductor capital equipment products and services to China-based customers (the “2024 BIS Rules”). Based on a preliminary review of the 2024 BIS Rules, we currently estimate the associated impact to be a reduction in total annual revenue in the range of…

Results of Operations and Financial Condition On November 6, 2024, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter ended September 30, 2024. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Results of Operations and Financial Condition On July 31, 2024, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter ended June 30, 2024. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Results of Operations and Financial Condition. On July 9, 2024, the Company issued a press release announcing certain preliminary results for the three months ended June 30, 2024. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Executive Chairperson — Mary G. Puma: The Executive Chairperson's term ended at the annual meeting and she transitioned to an advisory role, representing an orderly succession rather than a sudden loss of a C-suite executive.

Results of Operations and Financial Condition On May 1, 2024, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter ended March 31, 2024. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.

Director — Gregory B. Graves, Necip Sayiner: The filing discloses the routine election of two new directors to fill vacancies created by a board expansion, which is a standard governance event rather than an executive departure.

Results of Operations and Financial Condition On February 7, 2024, Axcelis Technologies, Inc. (the “Company”) issued a press release regarding its financial results for its quarter and year ended December 31, 2023. The Company’s press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein.