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Earnings Per Share
 3 Months Ended
Mar. 31, 2025
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
Basic earnings per share (“EPS”) is computed by dividing net income attributable to Amkor common stockholders by the weighted-average number of common shares outstanding during the period. The weighted-average number of common shares outstanding is reduced for treasury stock.
Diluted EPS is computed based on the weighted-average number of common shares outstanding plus the effect of dilutive potential common shares outstanding during the period. Dilutive potential common shares include outstanding stock options, performance-vested restricted stock units (“PSUs”) and time-vested restricted stock units (“RSUs”).
The following table summarizes the computation of basic and diluted EPS:
For the Three Months Ended March 31,
 20252024
 (In thousands,
except per share data)
Net income attributable to Amkor common stockholders$21,128 $58,897 
Weighted-average number of common shares outstanding - basic246,854 246,008 
Effect of dilutive securities:  
Share-based awards991 1,606 
Weighted-average number of common shares outstanding - diluted247,845 247,614 
Net income attributable to Amkor per common share:  
Basic$0.09 $0.24 
Diluted0.09 0.24 
The following table summarizes the potential shares of common stock that were excluded from diluted EPS because the effect of including these potential shares was anti-dilutive:
For the Three Months Ended March 31,
 20252024
 (In thousands)
Share-based awards38 11