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Equity (Tables)
 12 Months Ended
Dec. 31, 2024
Statement [LineItems]  
Summary of Share Capital
  a.
Share capital
Ordinary shares
 
$                        $                       
    
December 31
  
    
2023
    
2024
  
Numbers of shares authorized (in thousands)
   
 
 5,500,000
 
  
 
 5,500,000
 
  
 
 
    
 
 
  
Numbers of shares reserved (in thousands)
     
Employee share options
   
 
400,000
 
  
 
400,000
 
  
 
 
    
 
 
  
Number of shares issued and fully paid (in thousands)
   
 
4,385,465
  
  
 
4,415,251
  
  
 
 
    
 
 
  
 
$                        $                        $                       
   
December 31
  
   
2023
    
2024
  
   
NT$
    
NT$
    
US$ (Note 4)
  
Share capital authorized
  
$
 55,000,000
 
  
$
 55,000,000
 
  
$
1,677,341
 
 
 
 
    
 
 
    
 
 
  
Share capital reserved
      
Employee share options
  
$
4,000,000
  
  
$
4,000,000
  
  
$
121,988
  
 
 
 
    
 
 
    
 
 
  
Summary of Capital Surplus
  b.
Capital surplus
 
$                        $                        $                       
   
December 31
  
   
2023
    
2024
  
   
NT$
    
NT$
    
US$ (Note 4)
  
May be used to offset a deficit,
distributed as cash dividends,
or transferred to share capital (1)
                  
Issuance of ordinary shares
  
$
15,737,752
 
  
$
16,519,296
 
  
$
503,791
 
Merger by share exchange
  
 
117,693,658
 
  
 
117,693,658
 
  
 
3,589,316
 
Difference between consideration and the carrying amount of the subsidiaries’ net assets during actual disposal or acquisition
  
 
3,240,987
 
  
 
3,240,987
 
  
 
98,841
 
Exercised employee share options
  
 
3,503,786
 
  
 
3,706,398
 
  
 
113,034
 
Treasury share transactions
  
 
679,791
 
  
 
1,059,253
 
  
 
32,304
 
Donation from shareholders
  
 
471,894
 
  
 
471,894
 
  
 
14,391
 
Expired share options
  
 
646,773
 
  
 
647,094
 
  
 
19,735
 
 
 
 
    
 
 
    
 
 
  
 
 
141,974,641
  
  
 
143,338,580
  
  
 
4,371,412
  
 
 
 
    
 
 
    
 
 
  
 
$                        $                        $                       
   
December 31
  
   
2023
    
2024
  
   
NT$
    
NT$
    
US$ (Note 4)
  
May be used to offset a deficit only
                  
Changes in percentage of ownership interest in subsidiaries (2)
  
$
208,310
 
  
$
40,151
 
  
$
1,224
 
Share of changes in capital surplus of associates accounted for using the equity method
  
 
21,584
 
  
 
26,029
 
  
 
794
 
Dividends that the claim period has elapsed and unclaimed by shareholders
  
 
6,130
 
  
 
6,198
 
  
 
189
 
Exercised disgorgement
  
 
326
  
  
 
326
  
  
 
10
  
 
 
 
    
 
 
    
 
 
  
 
 
236,350
 
  
 
72,704
 
  
 
2,217
 
 
 
 
    
 
 
    
 
 
  
May not be used for any purpose
                  
Employee share options
  
 
1,904,176
 
  
 
3,325,062
 
  
 
101,405
 
Employee restricted stock awards
  
 
(49,650
) 
  
 
1,861,744
 
  
 
56,778
 
Others (3)
  
 
207,109
 
  
 
119,172
 
  
 
3,634
 
 
 
 
    
 
 
    
 
 
  
 
 
2,061,635
 
  
 
5,305,978
 
  
 
161,817
 
 
 
 
    
 
 
    
 
 
  
 
$
144,272,626
 
  
$
148,717,262
 
  
$
4,535,446
 
 
 
 
    
 
 
    
 
 
  
 
  1)
Such capital surplus may be used to offset a deficit; in addition, when the Company has no deficit, such capital surplus may be distributed as cash dividends or transferred to share capital (limited to a certain percentage of the Company’s capital surplus and once a year).
 
  2)
Such capital surplus arises from the effects of changes in ownership interests in subsidiaries resulting from equity transactions other than actual disposals or acquisitions, or from changes in capital surplus of subsidiaries accounted for using the equity method.
 
  3)
Such capital surplus represents the excess of the carrying amount of related accounts over the par value due to employee share options exercised and the Company has not completed registration formalities.
Disclosure of Detailed Information About Appropriation of Retained Earnings Explanatory
The appropriation of earnings for 2022 and 2023 were as follows:
 
   
Appropriation of Earnings
    
Dividends Per Share
  
   
For Year 2022
    
For Year 2023
    
For Year 2022
    
For Year 2023
  
   
NT$
    
NT$
    
NT$
    
NT$
  
               
(in dollars)
    
(in dollars)
  
Legal reserve
   $ 6,001,564     $ 3,232,866      
 
 
 
    
 
 
      
Special reserve (reversed)
   $ (6,845,501 )    $ (167,613 )     
 
 
 
    
 
 
      
Cash dividends
   $ 38,482,083     $ 22,838,947       $  8.8       $  5.2  
 
 
 
    
 
 
      
Summary of Unrealized Gain (Loss) on Financial Assets at FVTOCI
  2)
Unrealized gain (loss) on financial assets at FVTOCI
 
   
$
                
    
$
                
    
$
                
    
$
                
  
 
 
For the Year Ended December 31
 
 
 
2022
 
 
2023
 
 
2024
 
 
 
NT$
 
 
NT$
 
 
NT$
 
 
US$ (Note 4)
 
         
Balance at January 1
 
$
4,190,361
 
 
$
1,275,505
 
 
$
3,549,648
 
 
$
108,254
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unrealized gain (loss) recognized for the year
 
      
 
      
 
      
 
      
Debt instruments
 
 
(16,746
) 
 
 
(22,599
) 
 
 
(14,830
) 
 
 
(452
) 
Equity instruments
 
 
(8,360
) 
 
 
(77,496
) 
 
 
(18,871
)
 
 
(576
)
Share from associates and joint ventures accounted for using the equity method
 
 
(2,928,173
) 
 
 
2,447,656
 
 
 
155,784
 
 
 
4,751
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Other comprehensive income for the year
 
 
(2,953,279
) 
 
 
2,347,561
 
 
 
122,083
 
 
 
3,723
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cumulative unrealized loss of equity instruments transferred to retained earnings due to disposal
 
 
190,500
 
 
 
230,940
 
 
 
72,049
 
 
 
2,197
 
Cumulative unrealized gain transferred to retained earnings due to disposal of equity instruments in relation to associates and joint venture accounted for using the equity method
 
 
(152,077
) 
 
 
(304,358
) 
 
 
(13,221
) 
 
 
(403
) 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
         
Balance at December 31
 
$
 1,275,505
  
 
$
 3,549,648
  
 
$
 3,730,559
 
 
$
113,771
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Schedule of detailed information about hedges of net investments of foreign operations
  3)
Gain (loss) on hedging instruments – hedges of net investments of foreign operations
 
$                  $                  $                  $                 
   
For the Year Ended December 31
  
   
2022
    
2023
    
2024
  
   
NT$
    
NT$
    
NT$
    
US$ (Note 4)
  
Balance at January 1
  
$
121,833
 
  
$
520,281
 
  
$
   277,441
  
  
$
8,461
  
Recognized for the year
        
Foreign currency risk - loans denominated in foreign currency
  
 
398,448
  
  
 
(242,840
) 
  
 
438,262
 
  
 
13,366
 
 
 
 
    
 
 
    
 
 
    
 
 
  
Balance at December 31
  
$
    520,281
 
  
$
   277,441
  
  
$
715,703
 
  
$
 21,827
 
 
 
 
    
 
 
    
 
 
    
 
 
  
Summary of Unearned Employee Compensation
  4)
Unearned employee benefit
In August 2021 and June 2024, the shareholders’ meeting resolved to issue restricted stock awards to employees. Refer to Note 28 for the information.
 
$                  $                  $                  $                 
   
For the Year Ended December 31
  
   
2022
    
2023
    
2024
  
   
NT$
    
NT$
    
NT$
    
US$ (Note 4)
  
Balance at January 1
  
$
(1,164,991
) 
  
$
(432,847
) 
  
$
-
 
  
$
-
 
Issuance of shares
  
 
-
 
  
 
-
 
  
 
(1,954,312
) 
  
 
(59,600
)
Share-based payment expenses
  
 
    728,748
 
  
 
11,840
 
  
 
395,487
 
  
 
12,061
 
Valuation adjustments
  
 
3,396
 
  
 
   421,007
 
  
 
(72,432
) 
  
 
(2,209
) 
 
 
 
    
 
 
    
 
 
    
 
 
  
Balance at December 31
  
$
(432,847
) 
  
$
-
 
  
$
(1,631,257
) 
  
$
(49,748
) 
 
 
 
    
 
 
    
 
 
    
 
 
  
Summary of Shares Held By Subsidiaries
The Company’s shares held by its subsidiaries at each balance sheet date were as follows:
 
   
$
                
    
$
                
    
$
                
    
$
                
    
$
                
  
 
  
Shares

Held by
Subsidiaries
 
  
Carrying
Amount
 
  
Carrying
Amount
 
  
Fair Value
 
  
Fair Value
 
 
  
(in thousand
shares)
 
  
NT$
 
  
US$ (Note 4)
 
  
NT$
 
  
US$ (Note 4)
 
           
December 31, 2023
               
ASE
         67,452      $ 1,762,430     
 
   
 
    $  9,106,036     
 
   
 
ASE Test, Inc.
      5,489        196,677           741,067     
 
     
 
  
 
 
     
 
 
        
 
 
     
     72,941      $ 1,959,107         $ 9,847,103     
  
 
 
     
 
 
        
 
 
     
 
$
                
$
                
$
                
$
                
$
                
 
  
Shares

Held by
Subsidiaries
 
  
Carrying
Amount
 
  
Carrying
Amount
 
  
Fair Value
 
  
Fair Value
 
 
  
(in thousand
shares)
 
  
NT$
 
  
US$ (Note 4)
 
  
NT$
 
  
US$ (Note 4)
 
December 31, 2024
               
ASE
         67,452      $ 1,762,430      $ 53,749      $ 10,927,243      $ 333,249  
ASE Test, Inc.
      5,489        196,677        5,998        889,281        27,121  
  
 
 
     
 
 
     
 
 
     
 
 
     
 
 
  
     72,941      $ 1,959,107      $ 59,747      $ 11,816,524      $ 360,370  
  
 
 
     
 
 
     
 
 
     
 
 
     
 
 
  
Summary of Non-controlling Interests
  f.
Non-controlling interests
 
   
For the Year Ended December 31
  
   
2022
    
2023
    
2024
  
   
NT$
    
NT$
    
NT$
    
US$ (Note 4)
  
Balance at January 1
  
$
 14,544,415
 
  
$
 18,608,124
 
  
$
 20,270,547
 
  
$
  618,193
 
Share of profit for the year
  
 
3,116,549
 
  
 
1,849,952
 
  
 
1,437,974
 
  
 
43,854
 
Other comprehensive income (loss) for the year
        
Exchange difference on translating foreign operations
  
 
344,780
 
  
 
(47,301
) 
  
 
687,077
 
  
 
20,954
 
Unrealized gain (loss) on equity instruments at FVTOCI
  
 
(44,852
) 
  
 
26,560
 
  
 
6,599
 
  
 
201
 
Gain (loss) from hedging
  
 
110,781
 
  
 
(69,189
) 
  
 
124,336
 
  
 
3,792
 
Remeasurement on defined benefit plans
  
 
51,582
 
  
 
(15,876
) 
  
 
3,270
 
  
 
100
 
Share in other comprehensive loss from associates accounted for using the equity method
  
 
(35,142
) 
  
 
(7,514
) 
  
 
(7,157
) 
  
 
(218
) 
Repurchase of outstanding shares by subsidiaries (Note 31)
  
 
(312,775
) 
  
 
-
 
  
 
(270,291
) 
  
 
(8,243
) 
Disposal of subsidiary
  
 
-
 
  
 
(295,895
) 
  
 
-
 
  
 
-
 
Non-controlling interest arising from capital increase of subsidiaries
  
 
-
 
  
 
427,913
 
  
 
177,487
 
  
 
5,413
 
 
   
For the Year Ended December 31
  
   
2022
    
2023
    
2024
  
   
NT$
    
NT$
    
NT$
    
US$ (Note 4)
  
The Group’s subscription for subsidiaries’ capital increase at a percentage different from its existing ownership (Note 31)
  
$
-
 
  
$
-
 
  
$
69,141
 
  
$
2,108
 
Cash dividends distributed to non-controlling interests
  
 
(575,089
) 
  
 
(912,261
) 
  
 
(593,390
) 
  
 
(18,097
) 
Non-controlling interest relating to outstanding vested employee share options granted by subsidiaries
  
 
315,871
 
  
 
293,740
 
  
 
238,183
 
  
 
7,264
 
Equity component of convertible bonds issued by subsidiaries
  
 
1,092,004
 
  
 
412,294
 
  
 
100,885
 
  
 
3,077
 
 
 
 
    
 
 
    
 
 
    
 
 
  
Balance at December 31
  
$
 18,608,124
 
  
$
 20,270,547
 
  
$
 22,244,661
 
  
$
  678,398
 
 
 
 
    
 
 
    
 
 
    
 
 
  
Exchange differences on translating foreign operations [member]  
Statement [LineItems]  
Summary of Other Reserves
  1)
Exchange differences on translating foreign operations
 
   
For the Year Ended December 31
  
   
2022
    
2023
    
2024
  
   
NT$
    
NT$
    
NT$
    
US$ (Note 4)
  
Balance at January 1
  
$
(15,393,646
) 
  
$
(5,529,388
) 
  
$
(7,034,629
) 
  
$
(214,536
) 
Recognized for the year
        
Exchange differences arising on translating foreign operations
  
 
9,981,949
  
  
 
(1,488,920
) 
  
 
12,101,346
 
  
 
369,056
 
 
   
For the Year Ended December 31
  
   
2022
    
2023
    
2024
  
   
NT$
    
NT$
    
NT$
    
US$ (Note 4)
  
Share from associates and joint ventures accounted for using the equity method
  
$
(117,691
) 
  
$
(16,321
) 
  
$
(15,711
) 
  
$
(479
) 
 
 
 
    
 
 
    
 
 
    
 
 
  
Balance at December 31
  
$
 (5,529,388
) 
  
$
(7,034,629
) 
  
$
 5,051,006
 
  
$
154,041