7. Earnings Per Share

9 Months Ended

Sep. 30, 2022

. EARNINGS (LOSS) PER SHARE

Basic earnings (loss) per share is computed by dividing net income (loss) attributable to Bio-Rad by the weighted average number of common shares outstanding for that period. Diluted earnings per share takes into account the effect of dilutive instruments, such as stock options, restricted stock and performance stock, and uses the average share price for the period in determining the number of potential common shares that are to be added to the weighted average number of shares outstanding. Potential common shares are excluded from the diluted earnings (loss) per share calculation if the effect of including such securities would be anti-dilutive.

The weighted average number of common shares outstanding used to calculate basic and diluted earnings (loss) per share, and the anti-dilutive shares that are excluded from the diluted earnings (loss) per share calculation are as follows (in thousands):


	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2022	2021	2022	2021
Basic weighted average shares outstanding	29,733	29,814	29,819	29,800
Effect of potentially dilutive stock options, restricted stock and performance stock awards	—	410	—	390
Diluted weighted average common shares outstanding	29,733	30,224	29,819	30,190
Anti-dilutive shares	541	32	541	18