Allegro MicroSystems sells 28.75M shares at $23.16 per share in underwritten offering

ALLEGRO MICROSYSTEMS, INC.

Offering comprised 25M firm shares plus 3.75M option shares; option exercised in full prior to July 26 close.
Gross proceeds approximately $666M; offering made under existing shelf registration (File No. 333-280960).
Underwriters led by Barclays Capital Inc. and Morgan Stanley & Co. LLC as representatives.
Use of proceeds not specified in the filing; underwriting agreement filed as Exhibit 1.1.
Customary representations, warranties, indemnification, and contribution terms included.

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