Net Loss per Share Attributable to Portola Common Stockholders

3 Months Ended

Mar. 31, 2017

Net Loss per Share Attributable to Portola Common Stockholders

10. 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 common stock equivalent shares were excluded from the computation of diluted net loss per share attributable to Portola Common Stockholders for the three months ended March 31, 2017 and 2016 because including them would have been anti-dilutive:

	2017		2016
Stock options to purchase common stock		6,585,143		5,615,484
Performance stock options		180,752		—
Common stock warrants		1,500		1,500
Restricted stock units		631,743		318,228
Performance stock units		369,118		293,694
Employee stock purchase plan		5,816		8,867