Earnings per Share

6 Months Ended

Jun. 30, 2016

10. Earnings per share of QTS Realty Trust, Inc.

Basic income (loss) per share is calculated by dividing the net income (loss) attributable to common shares by the weighted average number of common shares outstanding during the period. Diluted income (loss) per share adjusts basic income (loss) per share for the effects of potentially dilutive common shares.

The computation of basic and diluted net income per share is as follows (in thousands, except per share data, and unaudited):


	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2016	2015	2016	2015
Numerator:
Net income available to common stockholders -- basic	$ 5,100	$ 4,632	$ 10,989	$ 8,714
Effect of net income attributable to noncontrolling interests	707	888	1,677	1,843
Net income available to common stockholders -- diluted	$ 5,807	$ 5,520	$ 12,666	$ 10,557
Denominator:
Weighted average shares outstanding -- basic	47,783	36,669	44,538	33,996
Effect of Class A and Class RS partnership units *	6,794	7,063	6,797	7,189
Effect of Class O units and options to purchase Class A common stock on an "as if" converted basis *	998	712	939	683
Weighted average shares outstanding -- diluted	55,575	44,444	52,274	41,868

Net income per share attributable to common stockholders -- basic	$ 0.11	$ 0.13	$0.25	$ 0.26
Net income per share attributable to common stockholders -- diluted	$ 0.10	$ 0.12	$0.24	$ 0.25

The Class A units, Class RS units and Class O units represent limited partnership interests in the Operating Partnership, and are described in more detail in Note 7.

No securities were antidilutive for the three months ended June 30, 2016 and 2015, or the six months ended June 30, 2016 and 2015, and as such, no securities were excluded from the computation of diluted net income per share for those periods.