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ALLEGRO MICROSYSTEMS, INC.

For the period ended Sep 26, 2025. Filed Oct 31, 2025.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 26, 2025 · Filed Oct 31, 2025

ALGM$28.17+5.1%Stored close · as of Nov 6, 2026

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Other Information

Item 5. Other Information

On August 4, 2025, Sharon Briansky, the Company’s Senior Vice President, General Counsel and Corporate Secretary, adopted a trading arrangement intended to satisfy the affirmative defense of Rule 10b5-1(c) (a “Rule 10b5-1 Trading Plan”). The Rule 10b5-1 Trading Plan provides for the potential sale of up to 64,956 shares of the Company’s common stock over a maximum duration of 364 days and is scheduled toterminate on August 3, 2026, or upon the earlier completion of all authorized transactions under the

Rule 10b5-1 Trading Plan.

The actual number of shares sold under the Rule 10b5-1 Trading Plan will depend on the number of shares delivered at the time that certain of Ms. Briansky’s restricted stock units vest during the term of the plan and the number of shares withheld by the Company to satisfy its income tax withholding obligation.

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