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Earnings per share | 9 Months Ended
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Sep. 30, 2023
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share Basic earnings per share are 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,
| 2023 |  | 2022 |  | 2023 |  | 2022
Basic weighted average number of shares outstanding | 10,519,431 |  |  | 11,270,589 |  |  | 10,874,055 |  |  | 11,901,727 |
Net dilutive effect of share-based awards, treasury stock method (1) | 920,798 |  |  | 919,836 |  |  | 872,282 |  |  | 907,273 |
Diluted weighted average number of shares outstanding | 11,440,229 |  |  | 12,190,425 |  |  | 11,746,337 |  |  | 12,809,000 |
Net income attributable to Oppenheimer Holdings Inc. | $ | 13,861 |  |  | $ | 4,520 |  |  | $ | 19,079 |  |  | $ | 9,938 |
Earnings per share attributable to Oppenheimer Holdings Inc. |  |  |  |  |  |
Basic | $ | 1.32 |  |  | $ | 0.40 |  |  | $ | 1.75 |  |  | $ | 0.84 |
Diluted | $ | 1.21 |  |  | $ | 0.37 |  |  | $ | 1.62 |  |  | $ | 0.78 |
(1) 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. For the three months ended September 30, 2022, the diluted net income per share computation did not include the anti-dilutive effect of 398,198 shares of Class A Stock granted under share-based compensation arrangements. For the nine months ended September 30, 2022, the diluted net income per share computation did not include the anti-dilutive effect of 22,250 shares of Class A Stock granted under share-based compensation arrangements.

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