Reconciliation of Non-GAAP Income Tax Provision
		Three-Month Period Ended
		June 28, 2024				March 29, 2024				June 30, 2023
		(Dollars in thousands)
GAAP Income Tax Provision		$	1,040			$	24,325			$	7,215
GAAP effective tax rate			(6.3	)%			141.0	%			10.6	%
Tax effect of adjustments to GAAP results			(395	)			(19,263	)			3,826
Non-GAAP Income Tax Provision		$	645			$	5,062			$	11,041
Non-GAAP effective tax rate			9.6	%			9.5	%			12.6	%

Reconciliation of Non-GAAP Net Income Attributable to Allegro MicroSystems, Inc. and Non-GAAP Earnings per Share
		Three-Month Period Ended
		June 28, 2024				March 29, 2024				June 30, 2023
		(Dollars in thousands)
GAAP Net (Loss) Income Attributable to Allegro MicroSystems, Inc. (1)		$	(17,675	)		$	(7,115	)		$	60,850
GAAP Basic weighted average common shares			193,465,708				193,139,519				191,997,330
GAAP Diluted weighted average common shares			193,465,708				193,139,519				194,991,906
GAAP Basic (Loss) Earnings per Share		$	(0.09	)		$	(0.04	)		$	0.32
GAAP Diluted (Loss) Earnings per Share		$	(0.09	)		$	(0.04	)		$	0.31
Transaction-related costs			1,842				7,144				3,079
Transaction-related interest			709				163				—
Impairment of long-lived assets			—				13,218				—
Purchased intangible amortization			5,410				5,501				760
Restructuring costs			2,414				2,441				—
Stock-based compensation			10,118				9,618				11,042
Other costs (2)			2,807				(2,319	)			4,589
Total Non-GAAP Adjustments			23,300				35,766				19,470
Tax effect of adjustments to GAAP results (3)			395				19,263				(3,826	)
Non-GAAP Net Income Attributable to Allegro MicroSystems, Inc.		$	6,020			$	47,914			$	76,494
Basic weighted average common shares			193,465,708				193,139,519				191,997,330
Diluted weighted average common shares			194,705,716				194,487,307				194,991,906
Non-GAAP Basic Earnings per Share		$	0.03			$	0.25			$	0.40
Non-GAAP Diluted Earnings per Share		$	0.03			$	0.25			$	0.39
(1) GAAP Net Loss Attributable to Allegro MicroSystems, Inc. represents GAAP Net Income adjusted for Net Income Attributable to non-controlling interests.
(2) Included in non-GAAP other costs are non-recurring charges that are individually immaterial for separate disclosure such as project evaluation costs, income (loss) in earnings of equity investments, unrealized losses (gains) on investments.
(3) To calculate the tax effect of adjustments to GAAP results, the Company considers each Non-GAAP adjustment by tax jurisdiction and reverses all discrete items to calculate an annual Non-GAAP effective tax rate (“NG ETR”). This NG ETR is then applied to Non-GAAP Profit Before Tax to arrive at the tax effect of adjustments to GAAP results.

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