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Stock-Based Compensation
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation STOCK-BASED COMPENSATION:
Stock Incentive Plans
The Omnibus Plan was approved by Quanta’s stockholders in May 2019 and provides for the award of non-qualified
stock options, incentive (qualified) stock options, stock appreciation rights, restricted stock awards, RSUs, stock bonus awards, performance compensation awards (including cash bonus awards) or any combination of the foregoing. Current and prospective employees, directors, officers, advisors or consultants of Quanta or its affiliates are eligible to participate in the Omnibus Plan. In May 2022, Quanta’s stockholders approved an amendment to the Omnibus Plan to increase the shares available for issuance. Subject to certain adjustments, the maximum number of shares available for issuance under the Omnibus Plan is 9.6 million, plus any shares underlying share-settling awards previously awarded pursuant to a prior equity incentive plan that are ultimately forfeited, canceled, expired or settled in cash subsequent to stockholder approval of the Omnibus Plan. As of December 31, 2023, there were approximately 2.5 million shares available for issuance under the Omnibus Plan. All awards subsequent to stockholder approval of the Omnibus Plan have been and will be made pursuant to the Omnibus Plan and applicable award agreements.
RSUs to be Settled in Common Stock
A summary of the activity for RSUs to be settled in common stock for the years ended December 31, 2023, 2022 and 2021 is as follows (RSUs in thousands):
202320222021
RSUsWeighted Average
Grant Date Fair Value
(Per Unit)		RSUsWeighted Average
Grant Date Fair Value
(Per Unit)		RSUsWeighted Average
Grant Date Fair Value
(Per Unit)
Unvested at January 13,263 $78.743,880 $61.643,869 $37.57
Granted684 $161.81860 $113.071,642 $94.83
Vested(1,268)$68.06(1,319)$50.60(1,476)$37.03
Forfeited(131)$116.29(158)$84.94(155)$48.52
Unvested at December 312,548 $104.763,263 $78.743,880 $61.64
The approximate fair value of RSUs that vested during the years ended December 31, 2023, 2022 and 2021 was $208.0 million, $152.5 million and $125.7 million, respectively.
During the years ended December 31, 2023, 2022 and 2021, Quanta recognized $94.5 million, $84.0 million and $67.3 million of non-cash stock compensation expense related to RSUs to be settled in common stock. As of December 31, 2023, there was $148.1 million of total unrecognized compensation expense related to unvested RSUs to be settled in common stock granted to both employees and non-employees. This cost is expected to be recognized over a weighted average period of 3.25 years.
PSUs to be Settled in Common Stock
A summary of the activity for PSUs to be settled in common stock for the years ended December 31, 2023, 2022 and 2021 is as follows (PSUs in thousands):
202320222021
PSUsWeighted Average
Grant Date Fair Value
(Per Unit)		PSUsWeighted Average
Grant Date Fair Value
(Per Unit)		PSUs
Weighted Average
Grant Date Fair Value
(Per Unit)
Unvested at January 1733 $65.39931 $47.271,047 $37.65
Granted177 $174.50153 $119.74174 $90.44
Vested(413)$35.12(334)$40.15(268)$38.28
Forfeited(6)$101.66(17)$58.79(22)$41.86
Unvested at December 31491 $129.70733 $65.39931 $47.27
The Monte Carlo simulation valuation methodology applied the following key inputs:
202320222021
Valuation date price based on March 9, 2023, March 2, 2022 and March 25, 2021 closing stock prices of Quanta common stock$160.55$110.24$83.48
Expected volatility35 %39 %36 %
Risk-free interest rate4.62 %1.64 %0.26 %
Term in years2.812.832.77
During the years ended December 31, 2023, 2022 and 2021, Quanta recognized $32.3 million, $21.6 million and $21.0 million of non-cash stock compensation expense related to PSUs to be settled in common stock.
As of December 31, 2023, there was an estimated $28.7 million of total unrecognized compensation expense related to unearned and unvested PSUs. This amount is based on forecasted attainment of performance metrics and estimated forfeitures of unearned and unvested PSUs. The compensation expense related to outstanding PSUs can vary from period to period based on changes in forecasted achievement of established performance goals and the total number of shares of common stock that Quanta anticipates will be issued upon vesting of such PSUs. This cost is expected to be recognized over a weighted average period of 1.70 years.
During the years ended December 31, 2023, 2022 and 2021, 0.7 million, 0.7 million and 0.5 million shares of common stock were issued in connection with PSUs. The approximate fair values of PSUs earned during the years ended December 31, 2023, 2022 and 2021 were $115.5 million, $72.4 million and $45.2 million, respectively.