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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Total Amkor Stockholders’ Equity
Common Stock
Additional Paid- In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Noncontrolling Interest in Subsidiaries
Balance at beginning of period, common stock (in shares) at Dec. 31, 2023     292,167          
Balance at beginning of period at Dec. 31, 2023 $ 3,995,035 $ 3,962,308 $ 292 $ 2,008,170 $ 2,159,831 $ 16,350 $ (222,335) $ 32,727
Balance at beginning of period, treasury stock (in shares) at Mar. 31, 2024             (46,340)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 59,786 58,897     58,897     889
Other comprehensive income (loss) (9,440) (9,440)       (9,440)    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (61)  
Treasury stock acquired through surrender of shares for tax withholding (1,822) (1,822)         $ (1,822)  
Issuance of stock through share-based compensation plans (in shares)     327          
Issuance of stock through share-based compensation plans 1,356 1,356   1,356        
Share-based compensation 5,256 5,256   5,256        
Cash dividends declared (19,428) (19,428)     (19,428)      
Subsidiary dividends to non-controlling interests (135)             (135)
Balance at end of period, common stock (in shares) at Mar. 31, 2024     292,494          
Balance at end of period at Mar. 31, 2024 $ 4,030,608 3,997,127 $ 292 2,014,782 2,199,300 6,910 $ (224,157) 33,481
Balance at end of period, treasury stock (in shares) at Dec. 31, 2023             (46,279)  
Balance at beginning of period, common stock (in shares) at Dec. 31, 2024 246,684   293,052          
Balance at beginning of period at Dec. 31, 2024 $ 4,183,165 4,149,545 $ 293 2,031,643 2,335,132 7,510 $ (225,033) 33,620
Balance at beginning of period, treasury stock (in shares) at Mar. 31, 2025 (46,427)           (46,427)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 21,853 21,128     21,128     725
Other comprehensive income (loss) 2,521 2,521       2,521    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (59)  
Treasury stock acquired through surrender of shares for tax withholding (1,319) (1,319)         $ (1,319)  
Issuance of stock through share-based compensation plans (in shares)     430          
Issuance of stock through share-based compensation plans 769 769   769        
Share-based compensation 4,196 4,196   4,196        
Cash dividends declared (20,430) (20,430)     (20,430)      
Subsidiary dividends to non-controlling interests $ (165)             (165)
Balance at end of period, common stock (in shares) at Mar. 31, 2025 247,055   293,482          
Balance at end of period at Mar. 31, 2025 $ 4,190,590 $ 4,156,410 $ 293 $ 2,036,608 $ 2,335,830 $ 10,031 $ (226,352) $ 34,180
Balance at end of period, treasury stock (in shares) at Dec. 31, 2024 (46,368)           (46,368)