* Non-GAAP Operating Expenses do not include adjustments for the following components of our net income: (i) additional AMTC related costs of $19, $380, and $2,939 for the three months ended December 25, 2020, September 25, 2020, and December 27, 2019, respectively, and labor savings costs of $109, $—, and $1,072 for the three months ended December 25, 2020, September 25, 2020, and December 27, 2019, respectively, and (ii) additional AMTC related costs of $723 and $8,603 for the nine months ended December 25, 2020 and December 27, 2019, respectively, and labor savings costs of $218 and $5,884 for the nine months ended December 25, 2020 and December 27, 2019, respectively.

		Three-Month Period Ended												Nine-Month Period Ended
		December 25, 2020				September 25, 2020				December 27, 2019				December 25, 2020				December 27, 2019
		(Dollars in thousands)
Reconciliation of Operating (Loss) Income
GAAP Operating (Loss) Income		$	(24,224	)		$	12,402			$	11,131			$	(7,290	)		$	33,923
PSL and Sanken Distribution Agreement		1,500				2,815				—				7,698				—
Stock-based compensation		45,876				580				303				46,901				1,051
AMTC Facility consolidation one-time costs		2,228				1,766				—				5,699				—
Amortization of acquisition-related intangible assets		344				114				—				458				—
COVID-19 related expenses		435				471				—				4,906				—
Transaction fees		1,729				1,871				2,335				3,717				3,782
Severance		(181		)		—				454				156				3,152
Total		$	51,931			$	7,617			$	3,092			$	69,535			$	7,985
Non-GAAP Operating Income*		$	27,707			$	20,019			$	14,223			$	62,245			$	41,908
Non-GAAP Operating Margin* (% of net sales)		16.8		%		14.6		%		8.9		%		15.0		%		8.8		%

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