Net Loss per Share Attributable to Portola Common Stockholders

3 Months Ended

Mar. 31, 2018

Net Loss per Share Attributable to Portola Common Stockholders

11. Net Loss per Share Attributable to Portola Common Stockholders

Basic net loss per share attributable to Portola Common Stockholders has been computed by dividing the net loss attributable to Portola Common Stockholders by the weighted-average number of shares of Common Stock outstanding during the period. Diluted net loss per share attributable to Portola Common Stockholders is calculated by dividing net loss attributable to Portola Common Stockholders by the weighted average number of shares of Common Stock and potential dilutive securities outstanding during the period.

The following outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share attributable to Portola common stockholders for the periods presented because including them would have been antidilutive:

	Three Months Ended March 31,
	2018		2017
Stock options to purchase common stock		7,293,733		6,585,143
Performance stock options		163,481		180,752
Common stock warrants		1,500		1,500
Restricted stock units		646,125		631,743
Performance stock units		393,225		369,118
Employee stock purchase plan		12,391		5,816

Up to one million shares may be contingently issued, if certain performance conditions are met under an agreement with one of our contract manufacturers.