Form 4 Filing for Webster Roald Graham - VP, Chief Accounting Officer of ALLEGRO MICROSYSTEMS, INC.

This Form 4 filing reports a transaction by Webster Roald Graham, VP, Chief Accounting Officer of ALLEGRO MICROSYSTEMS, INC. On May 16, 2026, Mr. Graham disposed of 4,277 shares of Common Stock. The transaction code is "F", indicating shares withheld to cover taxes upon the vesting of restricted stock units and performance-vesting restricted stock units. The shares were disposed of at a price of $43.10 per share. Following this transaction, Mr. Graham directly owns 18,323 shares of Common Stock. The filing is signed by Raymond Myer as Attorney-in-Fact for Roald G. Webster and was filed on May 19, 2026.