ALLEGRO MICROSYSTEMS INC

Manufacturing, Operations and Facilities

Our corporate headquarters is located in Manchester, New Hampshire, and we have a global footprint with 29 locations across four continents. Our operations are primarily conducted at the locations shown below. Our subsidiary, Allegro MicroSystems Philippines Inc. (“AMPI”), in Manila, Philippines, operates as our primary internal assembly and testing facility.

We also lease design and applications support centers in the Americas, Asia and Europe. Our decision to open and maintain additional design centers is based on several factors, including the ability to employ talented engineers at efficient costs and to better serve our local customer base.

Our manufacturing strategy consists of a combined internal and external sourcing strategy. This strategy enhances security of supply by providing both internal and external capacity throughout the manufacturing process and has enabled us to reduce our capital requirements, reduce our fixed costs, obtain additional capacity to meet customer needs in periods of high demand and establish wafer process technology collaborations.

We have a fabless business model that provides us with enhanced security of supply and manufacturing flexibility. Our primary fab partners currently include UMC, PSL, Tower and TSMC. We have master service agreements with all primary foundry partners, and we have also engaged in long-term supply agreements with some of our foundry partners.

The AMPI Facility is our primary internal assembly and testing facility for our sensor and power products, with packaging capabilities and quality standards that meet stringent automotive safety and reliability specification requirements. We also supplement the assembly capabilities of the AMPI Facility with subcontractors throughout Asia, and approximately 45%, 47% and 51% of our assembly was outsourced in fiscal years 2025, 2024 and 2023, respectively.

While our principal test operations are performed at the AMPI Facility, additional test capabilities are available at our Manchester, New Hampshire facility, and a small portion of testing is outsourced.

We are committed to manufacturing products of the highest quality and performance. We strive to have a “zero-defect” quality culture focused on meeting or exceeding demanding high-temperature automotive quality standards. We strive to comply with industry standards such as IATF 16949:2016 (the automotive sector-specific quality management system standard) and ISO 14001 (a voluntary standard for environmental management published by the International Standards Organization), and we also strive to comply with ISO 26262 ASIL product development standards, RoHS and similar environmental product requirements. Leading global automotive, industrial, and consumer manufacturers regularly audit our facilities for compliance with these standards, as well as with their own customer-specific standards.