Exhibit 99.1 Allegro MicroSystems Reports Second Quarter 2025 Results – Sales Increased 12% Sequentially to $187 Million – Manchester, NH, October 31, 2024 – Allegro MicroSystems, Inc. ("Allegro" or the "Company") (Nasdaq: ALGM), a global leader in power and sensing semiconductor solutions for motion control and energy efficient systems, today announced financial results for its second quarter ended September 27, 2024. "We delivered results in-line with our commitments. Second quarter sales were $187 millio ...