shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing. The information set forth herein will not be deemed an admission as to the materiality of any information required to be disclosed…

Executive Chair and Director — Bertrand Loy: Bertrand Loy is retiring from his roles as Executive Chair and Director, with James F. Gentilcore appointed as the new Board Chair and Robert A. Bruggeworth joining as a new director.

Other Events. On July 15, 2026, Entegris, Inc. announced that its board of directors has declared a quarterly cash dividend of $0.10 per share to be paid on August 19, 2026 to shareholders of record on the close of business on July 29, 2026 . A copy of this news release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

President, Materials Solutions — Daniel Woodland: Daniel Woodland is retiring and will be succeeded by Olivier Blachier.

Chief Financial Officer — Sukhi Nagesh: The appointment of Sukhi Nagesh as the new Chief Financial Officer is a significant leadership change.

shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing. The information set forth herein will not be deemed an admission as to the materiality of any information required to be disclosed…

Entry Into a Material Definitive Agreement. On April 29, 2026, Entegris, Inc., a Delaware corporation (“Entegris” or the “Company”) and certain of its subsidiaries entered into Amendment No. 4 (the “Fourth Amendment”) with the lenders, swingline lender and issuing banks party thereto and Morgan Stanley Senior Funding, Inc., as administrative agent and collateral agent, which amended the Credit and Guaranty Agreement, dated as of November 6, 2018, as amended and restated as of July 6, 2022 (as…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth under

Other Events. On April 15, 2026, Entegris, Inc. announced that its board of directors has declared a quarterly cash dividend of $0.10 per share to be paid on May 20, 2026 to shareholders of record on the close of business on April 29, 2026 . A copy of this news release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing. The information set forth herein will not be deemed an admission as to the materiality of any information required to be disclosed…

CFO — Linda LaGorga: The CFO is transitioning to a Senior Advisor role with a named interim successor (Michael Sauer) and a structured separation agreement, indicating an orderly succession rather than a sudden loss.

Other Events. On January 14, 2026, Entegris, Inc. announced that its board of directors has declared a quarterly cash dividend of $0.10 per share to be paid on February 18, 2026 to shareholders of record on the close of business on January 28, 2026 . A copy of this news release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing. The information set forth herein will not be deemed an admission as to the materiality of any information required to be disclosed…

Other Events. On October 15, 2025, Entegris, Inc. announced that its board of directors has declared a quarterly cash dividend of $0.10 per share to be paid on November 19, 2025 to shareholders of record on the close of business on October 29, 2025. A copy of this news release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing. The information set forth herein will not be deemed an admission as to the materiality of any information required to be disclosed…

Other Events. On July 16, 2025, Entegris, Inc. announced that its board of directors has declared a quarterly cash dividend of $0.10 per share to be paid on August 20, 2025 to shareholders of record on the close of business on July 30, 2025. A copy of this news release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Other Events. On July 16, 2025, Entegris, Inc. announced that its board of directors has declared a quarterly cash dividend of $0.10 per share to be paid on August 20, 2025 to shareholders of record on the close of business on July 30, 2025. A copy of this news release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

CEO — Bertrand Loy: The CEO is retiring with a pre-announced, named successor (David Reeder) taking over in a few months, representing an orderly succession rather than a sudden loss of leadership.

shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing. The information set forth herein will not be deemed an admission as to the materiality of any information required to be disclosed…

Other Events. On April 16, 2025, Entegris, Inc. announced that its board of directors has declared a quarterly cash dividend of $0.10 per share to be paid on May 21, 2025 to shareholders of record on the close of business on April 30, 2025. A copy of this news release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing. The information set forth herein will not be deemed an admission as to the materiality of any information required to be disclosed…

Other Events. On January 15, 2025, Entegris, Inc. announced that its board of directors has declared a quarterly cash dividend of $0.10 per share to be paid on February 19, 2025 to shareholders of record on the close of business on January 29, 2025. A copy of this news release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing. The information set forth herein will not be deemed an admission as to the materiality of any information required to be disclosed…

Director — Ms. Puma: The filing discloses the appointment of a director to a specific board committee, which is a routine governance action rather than a senior executive departure.

Other Events. On October 16, 2024, Entegris, Inc. announced that its board of directors has declared a quarterly cash dividend of $0.10 per share to be paid on November 20, 2024 to shareholders of record on the close of business on October 30, 2024. A copy of this news release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.