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Earnings Per Share
 9 Months Ended
Sep. 30, 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 September 30,For the Nine Months Ended September 30,
 2025202420252024
 (In thousands,
except per share data)
Net income attributable to Amkor common stockholders$126,589 $122,569 $202,134 $248,363 
Weighted-average number of common shares outstanding - basic247,158 246,480 247,035 246,239 
Effect of dilutive securities:    
Share-based awards1,144 1,442 1,019 1,559 
Weighted-average number of common shares outstanding - diluted248,302 247,922 248,054 247,798 
Net income attributable to Amkor per common share:    
Basic$0.51 $0.50 $0.82 $1.01 
Diluted0.51 0.49 0.81 1.00 
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 September 30,For the Nine Months Ended September 30,
 2025202420252024
 (In thousands)
Share-based awards18 — 3 —