Results of Operations and Financial Condition. On July 30, 2026, Allegro MicroSystems, Inc. (the “Company”) issued a press release announcing its financial results for the quarter ended June 26, 2026. The full text of the press release issued is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities…

Class III Director, Audit Committee Member, Compensation Committee Member — Brian C. White: Brian C. White was appointed to the Board and several committees, while the board size will decrease due to other directors not standing for reelection.

Director — Susan D. Lynch, Richard R. Lury: Two directors are retiring and not standing for reelection, but a new director has been appointed.

Results of Operations and Financial Condition. On May 7, 2026, Allegro MicroSystems, Inc. (the “Company”) issued a press release announcing its financial results for the quarter and fiscal year ended March 27, 2026. The full text of the press release issued is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of…

Results of Operations and Financial Condition. On January 29, 2026, Allegro MicroSystems, Inc. (the “Company”) issued a press release announcing its financial results for the quarter ended December 26, 2025. The full text of the press release issued is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Secu…

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

Entry into a Material Definitive Agreement. Term Loan Refinancing On January 21, 2026, Allegro MicroSystems, Inc. (the “Company”) entered into an Amendment No. 4 (the “Fourth Amendment”) to the Credit Agreement, dated as of June 21, 2023 (as amended by Amendment No. 1, dated as of October 31, 2023, Amendment No. 2, dated as of August 6, 2024, Amendment No. 3, dated February 6, 2025, and as further amended, restated, supplemented or otherwise modified, refinanced or replaced from time to time,…

shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act ”), or otherwise subject to the liabilities of that Section, nor shall it be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “ Securities Act ”), or the Exchange Act, except as expressly set forth by specific reference in such filing. Forward-Looking Statements This Current Report on Form 8-K conta…

Results of Operations and Financial Condition. On October 30, 2025, Allegro MicroSystems, Inc. (the “Company”) issued a press release announcing its financial results for the quarter ended September 26, 2025. The full text of the press release issued is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Sec…

Results of Operations and Financial Condition. On July 31, 2025, Allegro MicroSystems, Inc. (the “Company”) issued a press release announcing its financial results for the quarter ended June 27, 2025. The full text of the press release issued is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities…

Results of Operations and Financial Condition. On May 8, 2025, Allegro MicroSystems, Inc. (the “Company”) issued a press release announcing its financial results for the quarter and fiscal year ended March 28, 2025. The full text of the press release issued is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of…

Senior Vice President, Worldwide Sales — Max Glover: The SVP of Worldwide Sales is leaving their executive role to become a strategic advisor, representing a departure from the senior management team.

CEO — Vineet Nargolwala: The CEO is stepping down in an orderly succession with an immediate internal successor (Michael C. Doogue) and a signed separation agreement, indicating a planned transition rather than a sudden loss.

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

Entry into a Material Definitive Agreement. On February 6, 2025, Allegro MicroSystems, Inc. (the “Company”, “our” or “us”) entered into an Amendment No. 3 (the “Third Amendment”) to the Credit Agreement, dated as of June 21, 2023 (as amended by Amendment No. 1, dated as of October 31, 2023, Amendment No. 2, dated as of August 6, 2024 and as further amended, restated, supplemented or otherwise modified, refinanced or replaced from time to time, the “Credit Agreement”), by and among the Company…

Director — Krishna G. Palepu: The filing discloses the election of a new independent director to fill a vacancy, which is a routine board composition change rather than an executive departure.

Results of Operations and Financial Condition. On January 30, 2025, Allegro MicroSystems, Inc. (the “Company”) issued a press release announcing its financial results for the quarter ended December 27, 2024. The full text of the press release issued is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Secu…

shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section, nor shall it be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing. Forward-Looking Statements This Current Report on Form 8-K contains…

shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act ”), or otherwise subject to the liabilities of that Section, nor shall it be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “ Securities Act ”), or the Exchange Act, except as expressly set forth by specific reference in such filing. Forward-Looking Statements This Current Report on Form 8-K conta…

Director — David J. Aldrich: The Chairperson resigned from the Board and all committee roles, representing a genuine departure of a senior governance figure, though the filing notes no disagreement with management.

Results of Operations and Financial Condition. On October 31, 2024, Allegro MicroSystems, Inc. (the “Company”) issued a press release announcing its financial results for the quarter ended September 27, 2024. The full text of the press release issued is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. The information in this Current Report on Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Sec…

Director — Paul Carl “Chip” Schorr IV: A director resigned from the board and committee, which is a genuine departure but typically carries lower materiality than an executive officer departure.

Entry into a Material Definitive Agreement. On September 20, 2024, Allegro MicroSystems, Inc. (the “Company”), Sanken Electric Co., Ltd. (“Sanken”), Polar Semiconductor, LLC (“Polar”), and PS Investment Aggregator, L.P. (“Subscriber”) completed the transactions (the “Closing”) contemplated by the Sale and Subscription Agreement that the Company, Sanken, Polar and Subscriber entered into on April 25, 2024 (the “Agreement”), as previously reported on the Company’s Current Report on Form 8-K fil…

Other Events. On August 7, 2024, the Company completed the repurchase of the 10,017,315 remaining shares of the total 38,767,315 shares of its common stock from Sanken pursuant to the terms of the Share Repurchase Agreement concurrently with the receipt of the proceeds from the Increased and Refinanced Loans. The shares repurchased pursuant to the Share Repurchase Agreement will be retired as of the same date.

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