Net Income (loss) Per Common Share Attributable to Alpha and Omega Semiconductor Limited

Basic net income (loss) per share is computed using the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per share is computed using the weighted-average number of common shares outstanding, plus potential shares of common stock during the period. Potential shares of common stock include dilutive shares attributable to the assumed exercise of share options, ESPP shares and vesting of RSUs using the treasury stock method and contingent issuances of common shares related to convertible preferred shares, if dilutive. Under the treasury stock method, potential common shares outstanding are not included in the computation of diluted net income per share if their effect is anti-dilutive.

The following table presents the calculation of basic and diluted net income per share attributable to common shareholders:



	Year Ended June 30,
	2019		2018		2017
	(in thousands, except per share data)
Numerator:
Net income attributable to Alpha and Omega Semiconductor Limited	$	1,861	$	14,263	$	13,829

Denominator:
Basic:
Weighted average number of common shares used to compute basic net income per share	24,063		23,901		23,526

Diluted:
Weighted average number of common shares used to compute basic net income per share	24,063		23,901		23,526
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	635		943		1,300
Weighted average number of common shares used to compute diluted net income per share	24,698		24,844		24,826

Net income per share attributable to Alpha and Omega Semiconductor Limited:
Basic	$	0.08	$	0.60	$	0.59
Diluted	$	0.08	$	0.57	$	0.56

The following potential dilutive securities were excluded from the computation of diluted net income per share as their effect would have been anti-dilutive:



	Year Ended June 30,
	2019	2018	2017
	(in thousands)
Employee stock options and RSUs	593	186	105
ESPP	512	182	19
Total potential dilutive securities	1,105	368	124