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Earnings per share
 6 Months Ended
Jun. 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
June 30,
For the Six Months Ended
June 30,
 2023202220232022
Basic weighted average number of shares outstanding11,016,430 11,980,115 11,054,306 12,222,527 
Net dilutive effect of share-based awards, treasury stock method (1)
— — 857,073 919,011 
Diluted weighted average number of shares outstanding11,016,430 11,980,115 11,911,379 13,141,538 
Net income (loss) attributable to Oppenheimer Holdings Inc.$(9,400)$(3,874)$5,217 $5,418 
Earnings (Loss) per share attributable to Oppenheimer Holdings Inc.
       Basic$(0.85)$(0.32)$0.47 $0.44 
       Diluted$(0.85)$(0.32)$0.44 $0.41 

(1) For the three months ended June 30, 2023, the diluted net loss 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. For the three months ended June 30, 2022, the diluted net loss per share computation did not include the anti-dilutive effect of 1,267,733 shares of Class A Stock granted under share-based
compensation arrangements. For the six months ended June 30, 2022, the diluted net income per share computation did not include the anti-dilutive effect of 4,100 shares of Class A Stock granted under share-based compensation arrangements.