EARNINGS PER SHARE

6 Months Ended

Jun. 30, 2021

Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the periods. Diluted earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method, which includes consideration of equity awards.

The following table sets forth the details of basic and diluted earnings (loss) per share:


	Three Months Ended				Six Months Ended
	June 30				June 30
(In thousands, except per share data)	2021		2020		2021		2020
Net income (loss) attributable to WESCO International, Inc.	$	119,195	$	(34,506)	$	178,373	$	(100)
Less: Preferred stock dividends	14,352		1,276		28,704		1,276
Net income (loss) attributable to common stockholders	$	104,843	$	(35,782)	$	149,669	$	(1,376)
Weighted-average common shares outstanding used in computing basic earnings per share	50,243		42,683		50,184		42,260
Common shares issuable upon exercise of dilutive equity awards	1,751		92		1,691		152
Weighted-average common shares outstanding and common share equivalents, diluted	51,994		42,775		51,875		42,412
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings (loss) per share	51,994		42,683		51,875		42,260
Earnings (loss) per share attributable to common stockholders
Basic	$	2.09	$	(0.84)	$	2.98	$	(0.03)
Diluted	$	2.02	$	(0.84)	$	2.89	$	(0.03)

For the three and six months ended June 30, 2021, the computation of diluted earnings per share attributable to common stockholders excluded stock-based awards of approximately 0.1 million. For the three and six months ended June 30, 2020, the computation of diluted loss per share attributable to common stockholders excluded stock-based awards of approximately 3.0 million and 2.8 million, respectively. These amounts were excluded because their effect would have been antidilutive.