(9) Loss Per Share

The Company presents basic and diluted loss per share amounts. Basic loss per share is calculated by dividing net loss attributable to 3D Systems Corporation by the weighted average number of common shares outstanding during the applicable period. Diluted loss per share is calculated by dividing net loss by the weighted average number of common and common equivalent shares outstanding during the applicable period.

The following table reconciles basic weighted average outstanding shares to diluted weighted average outstanding for the quarters and six months ended June 30, 2016 and 2015:


	Quarter Ended June 30,				Six Months Ended June 30,
(in thousands, except per share amounts)	2016		2015		2016		2015
Numerator for basic and diluted net loss per share:
Net loss attributable to 3D Systems Corporation	$	(4,648)	$	(13,696)	$	(22,436)	$	(26,877)

Denominator for basic and diluted net loss per share:
Weighted average shares		111,166		112,017		111,288		111,875

Net loss per share, basic and diluted	$	(0.04)	$	(0.12)	$	(0.20)	$	(0.24)

Weighted average stock options excluded from diluted loss per share calculation (a)		8		—		4		—

^(a)

The calculation for weighted average outstanding diluted loss per share excludes stock options with an exercise price that exceeds the average market price of shares during the period. Additionally, the effect of their inclusion would have been anti-dilutive due to the Company’s net loss for the quarter and six months ended June 30, 2016 and 2015.

In addition to unexercised stock options, there was an immaterial number of additional shares issuable upon the vesting of restricted stock units that were excluded from the diluted share calculations because they were anti-dilutive.