The difference between GAAP and non-GAAP gross margin was 1.2% and 0.5%, or $1.1 million and $0.3 million, for the three months ended April 30, 2022 and April 30, 2021, respectively. The differences were due to the effect of stock-based compensation and the amortization of acquisition-related costs.

AMBARELLA, INC.
RECONCILIATION OF GAAP TO NON-GAAP DILUTED EARNINGS (LOSSES) PER SHARE
(in thousands, except share and per share data)
	Three Months Ended April 30,
		2022				2021
	(unaudited)
GAAP net loss	$	(10,822	)		$	(10,818	)
Non-GAAP adjustments:
Stock-based compensation expense		27,041				18,842
Acquisition-related costs		1,293				—
Income tax effect		(446	)			899
Non-GAAP net income	$	17,066			$	8,923
GAAP - diluted weighted average shares		37,715,338				35,940,304
Non-GAAP - diluted weighted average shares		39,002,530				38,081,315
GAAP - diluted net loss per share	$	(0.29	)		$	(0.30	)
Non-GAAP adjustments:
Stock-based compensation expense		0.72				0.52
Acquisition-related costs		0.03				—
Income tax effect		(0.01	)			0.03
Effect of Non-GAAP - diluted weighted average shares		(0.01	)			(0.02	)
Non-GAAP - diluted net income per share	$	0.44			$	0.23

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