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, PSUs and RSUs.
The following table summarizes the computations of basic and diluted EPS:
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| For the Year Ended December 31, |
| 2025 | | 2024 | | 2023 |
| (In thousands, except per share data) |
| | | | | |
| | | | | |
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| | | | | |
| | | | | |
| Net income attributable to Amkor common stockholders | $ | 373,895 | | $ | 354,012 | | | $ | 359,813 | |
| | | | | |
| Weighted-average number of common shares outstanding — basic | 247,082 | | | 246,344 | | | 245,628 | |
| Effect of dilutive securities: | | | | | |
| Share-based awards | 1,372 | | | 1,474 | | | 1,548 | |
| Weighted-average number of common shares outstanding — diluted | 248,454 | | | 247,818 | | | 247,176 | |
| Net income attributable to Amkor per common share: | | | | | |
| Basic | $ | 1.51 | | | $ | 1.44 | | | $ | 1.46 | |
| Diluted | $ | 1.50 | | | $ | 1.43 | | | $ | 1.46 | |
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:
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| For the Year Ended December 31, |
| 2025 | | 2024 | | 2023 |
| (In thousands) |
| Share-based awards | 7 | | | — | | | 2 | |
About Earnings Per Share Disclosures
The earnings per share disclosure breaks down the calculation from net income to both basic and diluted EPS, revealing the full impact of a company's capital structure on per-share economics. The reconciliation between basic and diluted share counts exposes how many stock options, RSUs, convertible securities, and warrants are potentially dilutive to existing shareholders.
Key signals: a widening gap between basic and diluted shares indicates growing dilution from equity compensation or convertible instruments. Anti-dilutive securities excluded from the diluted calculation deserve attention — they represent latent dilution that will materialize if the stock price rises. Watch for the effect of share buybacks on per-share metrics: EPS growth driven primarily by repurchases rather than income growth signals weakening fundamentals. Compare year-over-year changes in the diluted share count against equity compensation expense to assess whether management is effectively managing dilution.