Per Share Information

9 Months Ended

Sep. 30, 2021

PER SHARE INFORMATION:

The amounts used to compute basic and diluted earnings per share attributable to common stock consisted of the following (in thousands):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Amounts attributable to common stock:
Net income attributable to common stock	$	174,365	$	162,913	$	381,159	$	275,545

Weighted average shares outstanding:
Weighted average shares outstanding for basic earnings per share attributable to common stock	140,008		140,542		140,134		141,610
Effect of dilutive unvested non-participating stock-based awards	4,296		3,821		4,314		3,375
Weighted average shares outstanding for diluted earnings per share attributable to common stock	144,304		144,363		144,448		144,985

Basic and diluted earnings per share attributable to common stock are computed using the weighted average number of shares of common stock outstanding during the applicable period. Unvested stock-based awards that contain non-forfeitable rights to dividends or dividend equivalents (participating securities) have been included in the calculation of basic and diluted earnings per share attributable to common stock for the portion of the periods that the awards were outstanding. Weighted average shares outstanding for basic and diluted earnings per share attributable to common stock included 0.5 million and 1.4 million weighted average participating securities for the three months ended September 30, 2021 and 2020 and 0.7 million and 1.7 million weighted average participating securities for the nine months ended September 30, 2021 and 2020.

For purposes of calculating diluted earnings per share attributable to common stock, there were no adjustments required to derive Quanta’s net income attributable to common stock. Diluted earnings per share attributable to common stock is computed using the weighted average number of shares of common stock outstanding during the period adjusted for all potentially dilutive common stock equivalents, except in cases where the effect of the common stock equivalents would be antidilutive.