The difference between GAAP and non-GAAP gross margin was 1.3% and 0.6%, or $1.2 million and $0.3 million, for the three months ending January 31, 2022 and 2021, respectively. The difference between GAAP and non-GAAP gross margin was 0.7% and 0.6%, or $2.4 million and $1.3 million, for the fiscal years ending January 31, 2022 and 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 January 31,								Twelve Months Ended January 31,
		2022				2021				2022				2021
	(unaudited)
GAAP net loss	$	(9,193	)		$	(12,489	)		$	(26,411	)		$	(59,786	)
Non-GAAP adjustments:
Stock-based compensation expense		27,534				18,727				87,801				70,134
Acquisition-related costs		2,978				—				4,732				—
Income tax effect		(3,445	)			(1,092	)			(3,971	)			1,513
Non-GAAP net income	$	17,874			$	5,146			$	62,151			$	11,861
GAAP - diluted weighted average shares		37,133,454				35,338,351				36,577,120				34,679,717
Non-GAAP - diluted weighted average shares		39,655,416				37,569,396				38,706,977				35,994,296
GAAP - diluted net loss per share	$	(0.25	)		$	(0.35	)		$	(0.72	)		$	(1.72	)
Non-GAAP adjustments:
Stock-based compensation expense		0.74				0.53				2.40				2.02
Acquisition-related costs		0.08				—				0.13				—
Income tax effect		(0.09	)			(0.03	)			(0.11	)			0.04
Effect of Non-GAAP - diluted weighted average shares		(0.03	)			(0.01	)			(0.09	)			(0.01	)
Non-GAAP - diluted net income per share	$	0.45			$	0.14			$	1.61			$	0.33

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