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Earnings Per Share | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The company uses the two-class method to calculate basic and diluted earnings per common share because the shares of its Series G preferred stock are participating securities. Under the two-class method, undistributed earnings are allocated to common stock and participating securities according to their respective rights in undistributed earnings, as if all of the earnings for the period had been distributed. Basic earnings per common share is computed by dividing the net income attributable to common shareholders by the weighted average number of common shares outstanding during the period. Net income attributable to common shareholders is reduced for preferred stock dividends earned during the period. Preferred stock also receives a proportionate allocation of undistributed or overdistributed earnings for the period because the shares of its Series G preferred stock have a contractual obligation to share in profits and losses of the company. Diluted earnings per share is computed by dividing the net income attributable to common shareholders by the weighted average number of common shares outstanding plus potentially dilutive common shares. Anti-dilutive stock awards were as follows for the periods presented:
| Quarter Ended September 30, |  | Nine Months Ended September 30,
(in thousands) | 2025 |  | 2024 |  | 2025 |  | 2024
Stock awards | — |  |  | 333 |  |  | 79 |  |  | 334 |
Total | — |  |  | 333 |  |  | 79 |  |  | 334 |
The following table presents the earnings per share calculation for the periods presented:
|  | Quarter Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Net Income (in millions) |  | $ | 908.0 |  |  | $ | 912.8 |  |  | $ | 2,889.3 |  |  | $ | 2,651.2 |
Less: preferred stock dividends |  | (5.7) |  |  | (5.3) |  |  | (17.2) |  |  | (15.8) |
Less: undistributed earnings allocated to preferred stock |  | (5.7) |  |  | (6.2) |  |  | (19.1) |  |  | (17.6) |
Net Income Attributable to Common Shareholders of CME Group |  | $ | 896.6 |  |  | $ | 901.3 |  |  | $ | 2,853.0 |  |  | $ | 2,617.8 |
Weighted Average Number of Common Shares (in thousands): |  |  |  |  |  |  |  |
Basic |  | 359,686 |  |  | 359,400 |  |  | 359,653 |  |  | 359,329 |
Effect of restricted stock and performance shares |  | 736 |  |  | 589 |  |  | 677 |  |  | 570 |
Diluted |  | 360,422 |  |  | 359,989 |  |  | 360,330 |  |  | 359,899 |
Earnings per Common Share Attributable to Common Shareholders of CME Group: |  |  |  |  |  |  |  |
Basic |  | $ | 2.49 |  |  | $ | 2.51 |  |  | $ | 7.93 |  |  | $ | 7.29 |
Diluted |  | 2.49 |  |  | 2.50 |  |  | 7.92 |  |  | 7.27 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-3 + Details
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