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Earnings per share (Tables) | 9 Months Ended
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Sep. 30, 2025
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 September 30, |  | For the Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Basic weighted average number of shares outstanding | 10,519,722 |  |  | 10,332,927 |  |  | 10,502,101 |  |  | 10,355,982 |
Net dilutive effect of share-based awards, treasury stock method (1) | 930,624 |  |  | 944,938 |  |  | 847,700 |  |  | 800,554 |
Diluted weighted average number of shares outstanding | 11,450,346 |  |  | 11,277,865 |  |  | 11,349,801 |  |  | 11,156,536 |
Net income attributable to Oppenheimer Holdings Inc. | $ | 21,712 |  |  | $ | 24,508 |  |  | $ | 74,041 |  |  | $ | 60,828 |
Earnings per share attributable to Oppenheimer Holdings Inc. |  |  |  |  |  |
Basic | $ | 2.06 |  |  | $ | 2.38 |  |  | $ | 7.05 |  |  | $ | 5.87 |
Diluted | $ | 1.90 |  |  | $ | 2.16 |  |  | $ | 6.53 |  |  | $ | 5.45 |
(1) For the three months ended September 30, 2025, the diluted net income per share computation did not include the anti-dilutive effect of 7,000 shares of Class A Stock granted under share-based compensation arrangements. For the nine months ended September 30, 2025, the diluted net income per share computation did not include the anti-dilutive effect of 8,000 shares of Class A Stock granted under share-based compensation arrangements. For the three and 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.

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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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