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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2023
Stock-based Compensation |
Summary of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | average grant
​ |  | Shares |  | date fair value
Nonvested stock at December 31, 2022 |  | 556,062 | ​ | $ | 112.07
Granted |  | 304,433 | ​ | ​ | 124.89
Vested |  | (201,977) | ​ | ​ | 108.20
Forfeited |  | (3,550) | ​ | ​ | 115.89
Nonvested stock at March 31, 2023 |  | 654,968 | ​ | $ | 119.20
​
Summary of performance-based restricted stock units | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | average grant
​ |  | Shares |  | date fair value
Nonvested stock at December 31, 2022 |  | 166,702 | ​ | $ | 125.08
Granted |  | 84,686 | ​ | ​ | 142.09
Vested |  | (55,399) | ​ | ​ | 130.05
Forfeited |  | (3,911) | ​ | ​ | 154.00
Nonvested stock at March 31, 2023 |  | 192,078 | ​ | $ | 130.56
​
Cboe Digital Restricted Common Units |
Stock-based Compensation |
Summary of stock option/warrant activity |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | average exercise | ​ | Aggregate | ​ | average remaining
​ |  | Units |  | price |  | intrinsic value |  | contractual term
Nonvested units at December 31, 2022 |  | 185 | ​ | $ | 0.3 | ​ | $ | — |  | 6 years
Granted |  | — | ​ | ​ | — | ​ | ​ | — |  | ​
Vested |  | — | ​ | ​ | — | ​ | ​ | — |  | ​
Outstanding and exercisable March 31, 2023 |  | 185 | ​ | $ | 0.3 | ​ | $ | — |  | 6 years
Cboe Digital Warrants |
Stock-based Compensation |
Summary of stock option/warrant activity | The following table summarizes the Warrant activity during the year ended March 31, 2023 (in millions, except number of units):
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | average exercise
​ |  | Units |  | price
Nonvested units at December 31, 2022 |  | 80 | ​ | $ | 0.2
Granted |  | — | ​ | ​ | —
Vested |  | — | ​ | ​ | —
Outstanding and exercisable March 31, 2023 |  | 80 | ​ | $ | 0.2
​

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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