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Net Income (Loss) per Share (Tables)

6 Months Ended

Sep. 26, 2025

Earnings Per Share [Abstract]

Schedule of Computation of Net (Loss) Income per Share and Unaudited Pro Forma Net Income per Share

The following table sets forth the basic and diluted net income (loss) attributable to Allegro MicroSystems, Inc. per share:


		Three-Month Period Ended								Six-Month Period Ended
		September 26, 2025				September 27, 2024				September 26, 2025				September 27, 2024
Net income (loss) attributable to Allegro MicroSystems, Inc.		$	6,519			$	(33,675	)		$	(6,708	)		$	(51,350	)

Basic weighted average common shares			185,074,119				189,182,850				184,830,588				191,324,281
Dilutive effect of common stock equivalents			1,231,666				—				—				—
Diluted weighted average common shares			186,305,785				189,182,850				184,830,588				191,324,281

Basic net income (loss) per common share attributable to Allegro MicroSystems, Inc. stockholders		$	0.04			$	(0.18	)		$	(0.04	)		$	(0.27	)
Diluted net income (loss) per common share attributable to Allegro MicroSystems, Inc. stockholders		$	0.03			$	(0.18	)		$	(0.04	)		$	(0.27	)

Schedule of Anti Dilutive Securities Excluded

The computed net income (loss) per share for the three- and six-month periods ended September 26, 2025 and
September 27, 2024 does not assume conversion of securities that would have an antidilutive effect on net income (loss) per share. The following represents contingently issuable shares under the restricted stock units (“RSUs”) and performance-based restricted stock units (“PSUs”) excluded from the computation of net income (loss) per share, as such securities would have an antidilutive effect on net income (loss) per share if the Company had reported net income for those periods:


		Three-Month Period Ended								Six-Month Period Ended
		September 26, 2025				September 27, 2024				September 26, 2025				September 27, 2024
RSUs			5,386				1,644,248				190,751				1,177,126
PSUs			—				607,984				—				416,869

Schedule of Issuable Weighted Average Share Information

The following table represents issued and issuable weighted average share information underlying our outstanding RSUs, PSUs and participation in our employee stock purchase plan for the three- and six-month periods ended September 26, 2025 and
September 27, 2024.


		Three-Month Period Ended								Six-Month Period Ended
		September 26, 2025				September 27, 2024				September 26, 2025				September 27, 2024
RSUs			928,801				—				—				—
PSUs			302,865				—				—				—
ESPP			—				—				—				—
Total			1,231,666				—				—				—