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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Stock-based Compensation |
Summary of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted |
​ | ​ | Number of | ​ | average grant |
​ |  | shares |  | date fair value |
Nonvested stock at January 1, 2021 | ​ | 342,082 | ​ | $ | 108.40 | ​
Granted | ​ | 298,084 | ​ | ​ | 92.32 | ​
Vested | ​ | (166,598) | ​ | ​ | 106.13 | ​
Forfeited | ​ | (30,249) | ​ | ​ | 97.01 | ​
Nonvested stock at December 31, 2021 | ​ | 443,319 | ​ | $ | 99.22 | ​
Granted | ​ | 369,037 | ​ | ​ | 119.97 | ​
Vested | ​ | (201,457) | ​ | ​ | 99.87 | ​
Forfeited | ​ | (54,837) | ​ | ​ | 106.07 | ​
Nonvested stock at December 31, 2022 |  | 556,062 | ​ | $ | 112.07 | ​
Granted |  | 401,685 | ​ | ​ | 132.58 | ​
Vested |  | (237,315) | ​ | ​ | 108.25 | ​
Forfeited |  | (82,251) | ​ | ​ | 121.02 | ​
Nonvested stock at December 31, 2023 |  | 638,181 | ​ | $ | 125.25 | ​
Summary of performance-based restricted stock units activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​
​ | ​ | Number of | ​ | average grant | ​
​ |  | Shares |  | date fair value | ​
Nonvested stock at January 1, 2021 | ​ | 122,666 | ​ | $ | 115.18 | ​
Granted | ​ | 71,302 | ​ | ​ | 98.32 | ​
Vested | ​ | (29,468) | ​ | ​ | 111.45 | ​
Forfeited | ​ | (12,090) | ​ | ​ | 110.20 | ​
Nonvested stock at December 31, 2021 | ​ | 152,410 | ​ | $ | 108.41 | ​
Granted | ​ | 64,668 | ​ | ​ | 141.41 | ​
Vested | ​ | (16,834) | ​ | ​ | 96.00 | ​
Forfeited | ​ | (33,542) | ​ | ​ | 95.40 | ​
Nonvested stock at December 31, 2022 |  | 166,702 | ​ | $ | 125.08 | ​
Granted |  | 87,146 | ​ | ​ | 144.35 | ​
Vested |  | (55,399) | ​ | ​ | 130.05 | ​
Forfeited |  | (63,965) | ​ | ​ | 141.49 | ​
Nonvested stock at December 31, 2023 |  | 134,484 | ​ | $ | 127.72 | ​
Cboe Digital Restricted Common Units |
Stock-based Compensation |
Summary of stock option/warrant activity | The following table summarizes the option activity during the years ended December 31, 2023 and 2022 (in millions, except number of shares and contractual term):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | average | ​
​ | ​ | Number of | ​ | average | ​ | Aggregate | ​ | remaining | ​
​ | ​ | shares | ​ | exercise price | ​ | intrinsic value | ​ | contractual term | ​
Outstanding at January 1, 2022 | ​ | — | ​ | $ | — | ​ | $ | — | ​ | — | ​
Granted | ​ | 185 | ​ | ​ | 0.3 | ​ | ​ | — | ​ | 6 years | ​
Vested | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | — | ​
Outstanding at December 31, 2022 | ​ | 185 | ​ | $ | 0.3 | ​ | $ | — | ​ | 6 years | ​
Granted | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | — | ​
Vested | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | — | ​
Outstanding at December 31, 2023 | ​ | 185 | ​ | $ | 0.3 | ​ | $ | — | ​ | 5 years | ​
Cboe Digital Warrant Units |
Stock-based Compensation |
Summary of stock option/warrant activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | average
​ | ​ | shares | ​ | exercise price
Outstanding at January 1, 2022 | ​ | — | ​ | $ | —
Granted | ​ | 80 | ​ | ​ | 0.2
Vested | ​ | — | ​ | ​ | —
Outstanding at December 31, 2022 | ​ | 80 | ​ | $ | 0.2
Granted | ​ | — | ​ | ​ | —
Vested, but not exercised | ​ | 40 | ​ | ​ | 0.2
Outstanding and exercisable at December 31, 2023 | ​ | 40 | ​ | ​ | 0.2
Outstanding at December 31, 2023 | ​ | 80 | ​ | $ | 0.2

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