EARNINGS PER SHARE

3 Months Ended

Mar. 31, 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 per share:


	Three Months Ended
	March 31
(In thousands, except per share data)	2021		2020
Net income attributable to WESCO International, Inc.	$	59,178	$	34,407
Less: Preferred stock dividends	14,352		—
Net income attributable to common stockholders	$	44,826	$	34,407
Weighted-average common shares outstanding used in computing basic earnings per share	50,124		41,837
Common shares issuable upon exercise of dilutive equity awards	1,584		238
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share	51,708		42,075
Earnings per share attributable to common stockholders
Basic	$	0.89	$	0.82
Diluted	$	0.87	$	0.82

For the three months ended March 31, 2021 and 2020 , the computation of diluted earnings per share attributable to common stockholders excluded stock-based awards of approximately 0.3 million and 2.3 million, respectively. These amounts were excluded because their effect would have been antidilutive.