6. EARNINGS PER SHARE

The number of common shares outstanding totaled 84.2 million and 84.2 million at March 30, 2019 and December 29, 2018, respectively. Basic income per share is computed by dividing income available to common stockholders by the weighted‑average number of common shares outstanding during the period. Diluted income per share includes the additional effect of all potentially dilutive securities, which includes dilutive share options granted under stock‑based compensation plans.

A reconciliation of shares for basic and diluted net income per share is set forth below (in thousands, except per share data):


	Three Months Ended
	March 30,		March 31,
	2019		2018
Net income (loss)	$	2,167	$	(3,261)
Weighted-average common shares outstanding—basic		84,196		81,419
Effect of dilutive securities		1,661		—
Weighted-average common shares outstanding—diluted		85,857		81,419
Earnings (loss) per share
Basic	$	0.03	$	(0.04)
Diluted	$	0.03	$	(0.04)

Effects of potentially dilutive securities are presented only in periods in which they are dilutive. Stock options representing 1.6 million and 2.8 million shares of common stock were outstanding for the three months ended March 30, 2019 and March 31, 2018, respectively, but were excluded from the calculation of diluted earnings per share as their effect would be anti‑dilutive. In addition, for the three months ended March 30, 2019, 1.3 million shares of performance-based RSUs were excluded from the calculations of diluted earnings per share because these units were not considered to be contingent outstanding shares.