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Stock-Based Compensation Plans | 12 Months Ended
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Dec. 31, 2023
Stock-Based Compensation Plans |
Stock-Based Compensation Plans | Note 12. Stock-Based Compensation Plans ​ We make annual grants of long-term equity incentive awards to officers and key employees under our Second Amended and Restated 2015 Incentive Award Plan in the forms of service-based restricted stock units (“RSUs”) and performance-based restricted stock units (“PSUs”) that each have approximately 3-year vesting periods. We also grant the non-management members of our Board of Directors fully vested stock awards under our Directors Equity Plan. The fair values of the RSUs, PSUs and stock awards are determined based on the closing stock price of our common stock on the grant date. ​ At December 31, 2023, an aggregate of 1,539,738 shares were authorized for future grant under our various stock-based compensation plans. Awards that expire or are canceled without delivery of shares of our common stock and shares withheld related to net share settlements of vested restricted stock units generally become available for issuance under the plans. As RSUs and PSUs vest, we issue new shares of Reliance common stock. ​ Restricted Stock Units ​ We granted to key employees equity awards consisting of RSUs and PSUs in aggregate amounts as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | RSUs Vesting
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | December 1,
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | and
​ | ​ | ​ | ​ | ​ |  | RSU and PSU | ​ | Grant Date | ​ | PSUs Vesting
​ |  | RSUs |  | PSUs |  | Aggregate Units |  | Fair Value |  | December 31,
2023 | ​ | 109,683 | ​ | 84,129 | ​ | 193,812 | ​ | $ | 247.90 | ​ | 2025
2022 | ​ | 192,798 | ​ | 112,451 | ​ | 305,249 | ​ | $ | 187.31 | ​ | 2024
2021 | ​ | 191,139 | ​ | 127,356 | ​ | 318,495 | ​ | $ | 141.41 | ​ | 2023
​ Each RSU and PSU includes a service-based condition and consists of a right to receive shares of our common stock and dividend equivalent rights, subject to forfeiture, equal to the accrued cash or stock dividends where the record date for such dividends is after the grant date but before the award is settled. The RSUs provide the right to receive one share of our common stock and cliff vest on December 1 upon satisfaction of an approximately 3-year service-based condition. The PSUs include performance goals and the right to receive a maximum of two shares of our common stock and vest only upon the satisfaction of the service-based condition and certain performance targets for 3-year periods ending December 31. ​ A summary of the status of our unvested RSUs and PSUs as of December 31, 2023 and changes during the year then ended is as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | RSU and PSU | ​ | Grant Date
​ | ​ | Aggregate Units | ​ | Fair Value
Unvested at January 1, 2023 | ​ | 582,012 | ​ | $ | 164.60
Granted | ​ | 193,812 | ​ | ​ | 247.90
Vested | ​ | (310,485) | ​ | ​ | 146.27
Cancelled or forfeited | ​ | (28,100) | ​ | ​ | 187.55
Unvested at December 31, 2023 | ​ | 437,239 | ​ | $ | 213.06
Shares reserved for future grants (all plans) | ​ | 1,539,738 | ​ | ​ | ​
​ The fair values as of the respective vesting dates of RSUs and PSUs vested during 2023, 2022 and 2021 were $123.8 million, $147.2 million and $126.0 million, respectively. PSUs totaling 132,787 units that vested on December 31, 2023 were settled in February 2024 through the issuance of 265,574 equivalent shares of our common stock. ​ Stock Awards ​ In 2023, 2022 and 2021, we granted 4,305, 6,136 and 6,248 stock awards, in total, respectively, to the non-employee members of the Board of Directors that were fully vested on the grant date. The fair values of the stock awards granted in 2023, 2022 and 2021, were $243.61 per share, $182.41 per share and $166.39 per share, respectively, determined based on the closing price of our common stock on the respective grant dates. ​ Unrecognized Compensation Cost and Tax Benefits ​ As of December 31, 2023, there was $64.7 million of total unrecognized compensation cost related to unvested RSUs and PSUs that is expected to be recognized, net of actual forfeitures and cancellations, over a weighted average period of 1.6 years. ​ The tax benefit realized from our stock-based compensation plans in 2023, 2022 and 2021 was $7.7 million, $8.0 million and $6.8 million, respectively.

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