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Earnings Per Share
 9 Months Ended
Sep. 30, 2024
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, time-vested restricted stock units and unvested restricted shares.
The following table summarizes the computation of basic and diluted EPS:
For the Three Months Ended September 30,For the Nine Months Ended September 30,
 2024202320242023
 (In thousands,
except per share data)
Net income attributable to Amkor common stockholders$122,569 $132,614 $248,363 $242,251 
Weighted-average number of common shares outstanding - basic246,480 245,740 246,239 245,571 
Effect of dilutive securities:    
Share-based awards1,442 1,389 1,559 1,509 
Weighted-average number of common shares outstanding - diluted247,922 247,129 247,798 247,080 
Net income attributable to Amkor per common share:    
Basic$0.50 $0.54 $1.01 $0.99 
Diluted0.49 0.54 1.00 0.98 
There were no anti-dilutive shares for the three and nine months ended September 30, 2024 and 2023.