ALGM: Financial results

Item 2.02 Results of Operations and Financial Condition. On October 29, 2026, Allegro MicroSystems, Inc. (the “Company”) issued a press release announcing its financial results for the quarter ended September 25, 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 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, or the Exchange Act, except as expressly set forth by specific reference in such filing. Item 9.01 Financial Statements and Exhibits. (d) Exhibits Exhibit No. Description Exhibit 99.1 Press Release issued by Allegro MicroSystems, Inc. on October 29, 2026 Exhibit 104 Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101). SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. ALLEGRO MICROSYSTEMS, INC. Date: October 29, 2026 By: /s/ Derek P. D’Antilio Derek P. D’Antilio Executive Vice President, Chief Financial Officer and Treasurer