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Earnings per share | 9 Months Ended
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Sep. 30, 2024
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share Basic earnings per share is computed by dividing net income over the weighted average number of shares of Class A non-voting common stock ("Class A Stock") and Class B voting common stock ("Class B Stock") outstanding. Diluted earnings per share includes the weighted average number of shares of Class A Stock and Class B Stock outstanding and options to purchase Class A Stock and unvested restricted stock awards of Class A Stock using the treasury stock method. Earnings per share have been calculated as follows:
(Expressed in thousands, except number of shares and per share amounts) |  |  |  |  |  |
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Basic weighted average number of shares outstanding | 10,332,927 |  |  | 10,519,431 |  |  | 10,355,982 |  |  | 10,874,055 |
Net dilutive effect of share-based awards, treasury stock method (1) | 944,938 |  |  | 920,798 |  |  | 800,554 |  |  | 872,282 |
Diluted weighted average number of shares outstanding | 11,277,865 |  |  | 11,440,229 |  |  | 11,156,536 |  |  | 11,746,337 |
Net income attributable to Oppenheimer Holdings Inc. | $ | 24,508 |  |  | $ | 13,861 |  |  | $ | 60,828 |  |  | $ | 19,079 |
Earnings per share attributable to Oppenheimer Holdings Inc. |  |  |  |  |  |
Basic | $ | 2.38 |  |  | $ | 1.32 |  |  | $ | 5.87 |  |  | $ | 1.75 |
Diluted | $ | 2.16 |  |  | $ | 1.21 |  |  | $ | 5.45 |  |  | $ | 1.62 |
(1) For the three months ended September 30, 2024, there were no shares of Class A Stock with an anti-dilutive effect granted under share-based compensation arrangements. For the nine months ended September 30, 2024, there were no shares of Class A Stock with an anti-dilutive effect granted under share-based compensation arrangements. For the three months ended September 30, 2023, the diluted net income per share computation did not include the anti-dilutive effect of 286,185 shares of Class A Stock granted under share-based compensation arrangements. For the nine months ended September 30, 2023, the diluted net income per share computation did not include the anti-dilutive effect of 277,435 shares of Class A Stock granted under share-based compensation arrangements.

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