Net Loss Per Share

6 Months Ended

Jun. 30, 2011

Net Loss Per Share

Net Loss Per Share

4. Net Loss Per Share

Basic and diluted net loss per share is calculated as follows (in thousands, except share and per share amounts):

	Three Months Ended June 30,						Six Months Ended June 30,
	2011			2010			2011			2010
Numerator:
Net loss from continuing operations	$	(18,844	)	$	(17,165	)	$	(37,245	)	$	(31,646	)
Net loss from discontinued operations	—			(44		)	—			(1,816		)
Less: net loss from discontinued operations attributable to noncontrolling interest	—			73			—			402
Net income (loss) from discontinued operations attributable to Ironwood Pharmaceuticals, Inc.	—			29			—			(1,414		)
Net loss attributable to Ironwood Pharmaceuticals, Inc.	$	(18,844	)	$	(17,136	)	$	(37,245	)	$	(33,060	)
Denominator:
Weighted average number of common shares used in net loss per share attributable to Ironwood Pharmaceuticals, Inc.—basic and diluted	99,674,969			97,642,330			99,458,336			80,893,200
Net loss per share associated with continuing operations	$	(0.19	)	$	(0.18	)	$	(0.37	)	$	(0.39	)
Net loss per share associated with discontinued operations attributable to Ironwood Pharmaceuticals, Inc.	$	—		$	—		$	—		$	(0.02	)
Net loss per share attributable to Ironwood Pharmaceuticals, Inc.—basic and diluted	$	(0.19	)	$	(0.18	)	$	(0.37	)	$	(0.41	)

The net loss attributable to noncontrolling interest is reflected in the net loss from discontinued operations for purposes of segregating the earnings per share calculation between continuing and discontinued operations.

The following potentially dilutive securities have been excluded from the computation of diluted weighted average shares outstanding as of June 30, 2011 and 2010, as they would be anti-dilutive:

	At June 30,
	2011	2010
Options to purchase common stock	15,786,758	14,888,833
Shares subject to repurchase	203,201	338,556
	15,989,959	15,227,389