0000866291 2026-10-29 2026-10-29 false 0000866291 8-K 2026-10-29 Allegro MicroSystems, Inc. DE 001-39675 46-2405937 955 Perimeter Road Manchester NH 03103 603 626-2300 false false false false Common Stock, par value $0.01 per share ALGM NASDAQ false