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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2024
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share | Earnings per share have been calculated as follows:
(Expressed in thousands, except number of shares and per share amounts) |  |  |  |  |  |
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Basic weighted average number of shares outstanding | 10,327,818 |  |  | 11,016,430 |  |  | 10,367,636 |  |  | 11,054,306 |
Net dilutive effect of share-based awards, treasury stock method (1) | 784,085 |  |  | — |  |  | 715,786 |  |  | 857,073 |
Diluted weighted average number of shares outstanding | 11,111,903 |  |  | 11,016,430 |  |  | 11,083,422 |  |  | 11,911,379 |
Net income attributable to Oppenheimer Holdings Inc. | $ | 10,266 |  |  | $ | (9,400) |  |  | $ | 36,320 |  |  | $ | 5,217 |
Earnings per share attributable to Oppenheimer Holdings Inc. |  |  |  |  |  |
Basic | $ | 0.99 |  |  | $ | (0.85) |  |  | $ | 3.49 |  |  | $ | 0.47 |
Diluted | $ | 0.92 |  |  | $ | (0.85) |  |  | $ | 3.29 |  |  | $ | 0.44 |
(1) For the three months ended June 30, 2024, there were no shares of Class A Stock with an anti-dilutive effect granted under share-based compensation arrangements. For the six months ended June 30, 2024, the diluted net income per share computation did not include the anti-dilutive effect of 1,000 shares of Class A Stock granted under share-based compensation arrangements. For the three months ended June 30, 2023, the diluted net income per share computation did not include the anti-dilutive effect of 1,138,992 shares of Class A Stock granted under share-based compensation arrangements. For the six months ended June 30, 2023, the diluted net income per share computation did not include the anti-dilutive effect of 281,810 shares of Class A Stock granted under share-based compensation arrangements.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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