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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 Sep. 30, 2024             (46,362)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 249,734 248,363     248,363     1,371
Other comprehensive income (loss) (6,102) (6,102)       (6,102)    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (83)  
Treasury stock acquired through surrender of shares for tax withholding (2,547) (2,547)         $ (2,547)  
Issuance of stock through share-based compensation plans (in shares)     825          
Issuance of stock through share-based compensation plans 4,708 4,708 $ 1 4,707        
Share-based compensation 15,147 15,147   15,147        
Cash dividends declared (58,256) (58,256)     (58,256)      
Subsidiary dividends to non-controlling interests (465)             (465)
Balance at end of period, common stock (in shares) at Sep. 30, 2024     292,992          
Balance at end of period at Sep. 30, 2024 4,197,254 4,163,621 $ 293 2,028,024 2,349,938 10,248 $ (224,882) 33,633
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 Jun. 30, 2024     292,642          
Balance at beginning of period at Jun. 30, 2024 4,083,334 4,049,657 $ 293 2,022,512 2,246,795 4,214 $ (224,157) 33,677
Balance at beginning of period, treasury stock (in shares) at Sep. 30, 2024             (46,362)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 122,690 122,569     122,569     121
Other comprehensive income (loss) 6,034 6,034       6,034    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (22)  
Treasury stock acquired through surrender of shares for tax withholding (725) (725)         $ (725)  
Issuance of stock through share-based compensation plans (in shares)     350          
Issuance of stock through share-based compensation plans 1,892 1,892   1,892        
Share-based compensation 3,620 3,620   3,620        
Cash dividends declared (19,426) (19,426)     (19,426)      
Subsidiary dividends to non-controlling interests (165)             (165)
Balance at end of period, common stock (in shares) at Sep. 30, 2024     292,992          
Balance at end of period at Sep. 30, 2024 $ 4,197,254 4,163,621 $ 293 2,028,024 2,349,938 10,248 $ (224,882) 33,633
Balance at end of period, treasury stock (in shares) at Jun. 30, 2024             (46,340)  
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 Sep. 30, 2025 (46,444)           (46,444)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 203,587 202,134     202,134     1,453
Other comprehensive income (loss) 4,379 4,379       4,379    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (76)  
Treasury stock acquired through surrender of shares for tax withholding (1,737) (1,737)         $ (1,737)  
Issuance of stock through share-based compensation plans (in shares)     584          
Issuance of stock through share-based compensation plans 1,230 1,230 $ 1 1,229        
Share-based compensation 14,145 14,145   14,145        
Cash dividends declared (61,330) (61,330)     (61,330)      
Subsidiary dividends to non-controlling interests $ (495)             (495)
Balance at end of period, common stock (in shares) at Sep. 30, 2025 247,192   293,636          
Balance at end of period at Sep. 30, 2025 $ 4,342,944 4,308,366 $ 294 2,047,017 2,475,936 11,889 $ (226,770) 34,578
Balance at end of period, treasury stock (in shares) at Dec. 31, 2024 (46,368)           (46,368)  
Balance at beginning of period, common stock (in shares) at Jun. 30, 2025     293,577          
Balance at beginning of period at Jun. 30, 2025 $ 4,232,074 4,197,424 $ 294 2,041,548 2,369,797 12,299 $ (226,514) 34,650
Balance at beginning of period, treasury stock (in shares) at Sep. 30, 2025 (46,444)           (46,444)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 126,682 126,589     126,589     93
Other comprehensive income (loss) (410) (410)       (410)    
Treasury stock acquired through surrender of shares for tax withholding (in shares)             (9)  
Treasury stock acquired through surrender of shares for tax withholding (256) (256)         $ (256)  
Issuance of stock through share-based compensation plans (in shares)     59          
Issuance of stock through share-based compensation plans 328 328   328        
Share-based compensation 5,141 5,141   5,141        
Cash dividends declared (20,450) (20,450)     (20,450)      
Subsidiary dividends to non-controlling interests $ (165)             (165)
Balance at end of period, common stock (in shares) at Sep. 30, 2025 247,192   293,636          
Balance at end of period at Sep. 30, 2025 $ 4,342,944 $ 4,308,366 $ 294 $ 2,047,017 $ 2,475,936 $ 11,889 $ (226,770) $ 34,578
Balance at end of period, treasury stock (in shares) at Jun. 30, 2025             (46,435)