v3.26.1
Financial Risk and Fair Value Disclosures (Tables)
12 Months Ended
Dec. 31, 2025
Disclosure of detailed information about financial instruments [line items]  
Categories of Financial Instruments
  (1)
Categories of financial instruments
 
     As of December 31,  
Financial Assets
   2024      2025  
     NT$      NT$  
     (In Thousands)      (In Thousands)  
Financial assets at fair value through profit or loss
   $ 18,456,932      $ 18,153,916  
Financial assets at fair value through other comprehensive income
     17,209,328        13,774,749  
Financial assets measured at amortized cost
     
Cash and cash equivalents (cash on hand excluded)
     104,993,968        110,653,397  
Receivables
     34,994,933        33,731,393  
Refundable deposits
     1,992,400        1,643,661  
Other financial assets
     3,739,224        12,506,177  
  
 
 
    
 
 
 
Total
   $ 181,386,785      $ 190,463,293  
  
 
 
    
 
 
 
 
     As of December 31,  
Financial Liabilities
   2024      2025  
     NT$      NT$  
     (In Thousands)      (In Thousands)  
Financial liabilities at fair value through profit or loss
   $ 901,000      $ 57,163  
Financial liabilities measured at amortized cost
     
Short-term loans
     8,515,000        8,408,772  
Payables
     42,259,798        45,297,553  
Bonds payable (current portion included)
     30,051,568        50,228,305  
Long-term loans (current portion included)
     36,476,909        14,331,790  
Lease liabilities
     6,419,016        6,000,846  
Guarantee deposits (current portion included)
     42,874,494        40,867,857  
  
 
 
    
 
 
 
Total
   $ 167,497,785      $ 165,192,286  
  
 
 
    
 
 
 
Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments and Contractual Maturity
The table below summarizes the maturity profile of the Company’s financial liabilities based on the contractual undiscounted payments and contractual maturity:
 
     As of December 31, 2024  
     Less than
1 year
    2 to 3
years
     4 to 5
years
     > 5 years      Total  
     NT$     NT$      NT$      NT$      NT$  
     (In Thousands)     (In Thousands)      (In Thousands)      (In Thousands)      (In Thousands)  
Non-derivative
financial liabilities
             
Short-term loans
   $ 8,683,215     $ —       $ —       $ —       $ 8,683,215  
Payables
     42,136,632       —         —         —         42,136,632  
Bonds payable (Note A)
     340,976       16,675,030        12,146,745        2,118,683        31,281,434  
Long-term loans
     6,354,561       11,490,087        21,478,391        93,106        39,416,145  
Lease liabilities
     830,618       1,509,438        1,437,870        4,442,706        8,220,632  
Guarantee deposits
     921,134       4,571,633        27,522,150        9,859,577        42,874,494  
  
 
 
   
 
 
    
 
 
    
 
 
    
 
 
 
Total
   $ 59,267,136     $ 34,246,188      $ 62,585,156      $ 16,514,072      $ 172,612,552  
  
 
 
   
 
 
    
 
 
    
 
 
    
 
 
 
Derivative financial liabilities
             
Forward exchange contracts
             
Net settlement-outflow
   $ (1,039 )    $ —       $ —       $ —       $ (1,039 ) 
  
 
 
   
 
 
    
 
 
    
 
 
    
 
 
 
     As of December 31, 2025  
     Less than
1 year
    2 to 3
years
     4 to 5
years
     > 5 years      Total  
     NT$     NT$      NT$      NT$      NT$  
     (In Thousands)     (In Thousands)      (In Thousands)      (In Thousands)      (In Thousands)  
Non-derivative
financial liabilities
             
Short-term loans
   $ 8,589,773     $ —       $ —       $ —       $ 8,589,773  
Payables
     45,055,193       —         —         —         45,055,193  
Bonds payable (Note A)
     17,033,209       25,278,203        7,958,238        2,104,403        52,374,053  
Long-term loans
(Note B)
     3,319,372       8,227,746        3,612,205        24,510        15,183,833  
Lease liabilities
     805,290       1,470,303        1,434,794        3,970,634        7,681,021  
Guarantee deposits
     1,061,929       19,143,652        13,847,566        6,814,710        40,867,857  
  
 
 
   
 
 
    
 
 
    
 
 
    
 
 
 
Total
   $ 75,864,766     $ 54,119,904      $ 26,852,803      $ 12,914,257      $ 169,751,730  
  
 
 
   
 
 
    
 
 
    
 
 
    
 
 
 
Derivative financial liabilities
             
Forward exchange contracts
             
Net settlement-outflow
   $ (2,512 )    $ —       $ —       $ —       $ (2,512 ) 
  
 
 
   
 
 
    
 
 
    
 
 
    
 
 
 
Details of Forward Exchange Contracts The details of forward exchange contracts entered into by UMC are summarized as follows:
As of December
 31, 2024
 
Type
  
Notional Amount
  
Contract Period
Forward exchange contracts
  
Sell USD 24 million
   December 27, 2024 - January 21, 2025
As of December
 31, 2025
 
Type
  
Notional Amount
  
Contract Period
Forward exchange contracts
  
Sell USD 22 million
   December 8, 2025 –January 23, 2026
Reconciliation for Fair Value Measurement in Level 3 Fair Value Hierarchy
Reconciliation for fair value measurement in Level 3 fair value hierarchy were as follows:
 
     Financial assets at fair value through profit or loss     Financial assets at fair value through
other comprehensive income
 
     Common stock     Preferred stock     Funds     Convertible
bonds
     Others     Total     Common stock      Preferred stock      Total  
     NT$     NT$     NT$     NT$      NT$     NT$     NT$      NT$      NT$  
     (In Thousands)     (In Thousands)     (In Thousands)     (In Thousands)      (In Thousands)     (In Thousands)     (In Thousands)      (In Thousands)      (In Thousands)  
As of January 1, 2024
   $ 3,036,255     $ 2,786,634     $ 4,274,896     $ —       $ 153,300     $ 10,251,085     $ 3,062,325      $ 175,063      $ 3,237,388  
Recognized in profit (loss)
     (119,584 )      187,131       128,617       3,120        4,140       203,424       —         —         —   
Recognized in other comprehensive income (loss)
     —        —        —        —         —        —        104,499        29,817        134,316  
Acquisition
     505,538       639,779       1,133,312       51,191        —        2,329,820       64,694        —         64,694  
Disposal
     (78,234 )      (311,066 )      (81,371 )      —         (96,312 )      (566,983 )      —         —         —   
Return of capital
     (83 )      —        (12,405 )      —         —        (12,488 )      —         —         —   
Transfer out of Level 3
     (377,121 )      —        —        —         —        (377,121 )      —         —         —   
Exchange effect
     41,412       101,455       153,398       455        4,332       301,052       —         —         —   
  
 
 
   
 
 
   
 
 
   
 
 
    
 
 
   
 
 
   
 
 
    
 
 
    
 
 
 
As of December 31, 2024
   $ 3,008,183     $ 3,403,933     $ 5,596,447     $ 54,766      $ 65,460     $ 12,128,789     $ 3,231,518      $ 204,880      $ 3,436,398  
  
 
 
   
 
 
   
 
 
   
 
 
    
 
 
   
 
 
   
 
 
    
 
 
    
 
 
 
     Financial assets at fair value through profit or loss     Financial assets at fair value through
other comprehensive income
 
     Common stock     Preferred stock     Funds     Convertible
bonds
    Others     Total     Common stock     Preferred stock     Total  
     NT$     NT$     NT$     NT$     NT$     NT$     NT$     NT$     NT$  
     (In Thousands)     (In Thousands)     (In Thousands)     (In Thousands)     (In Thousands)     (In Thousands)     (In Thousands)     (In Thousands)     (In Thousands)  
As of January 1, 2025
   $ 3,008,183     $ 3,403,933     $ 5,596,447     $ 54,766     $ 65,460     $ 12,128,789     $ 3,231,518     $ 204,880     $ 3,436,398  
Recognized in profit (loss)
     (38,312 )      298,725       (565,008 )      194       (2,760 )      (307,161 )      —        —        —   
Recognized in other comprehensive income (loss)
     —        —        —        —        —        —        (270,121 )      (2,072 )      (272,193 ) 
Acquisition
     264,125       281,776       292,459       147,571       9,903       995,834       150,000       —        150,000  
Disposal
     (10,142 )      (66,319 )      (372,135 )      (103,104 )      —        (551,700 )      —        —        —   
Return of capital
     —        —        (19,777 )      —        —        (19,777 )      (160,659 )      —        (160,659 ) 
Transfer out of Level 3
     (194,460 )      —        —        —        —        (194,460 )      —        —        —   
Exchange effect
     (29,257 )      (77,041 )      (119,443 )      (775 )      57       (226,459 )      —        —        —   
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
As of December 31, 2025
   $ 3,000,137     $ 3,841,074     $ 4,812,543     $ 98,652     $ 72,660     $ 11,825,066     $ 2,950,738     $ 202,808     $ 3,153,546  
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Reconciliation for Fair Value Measurement in Level 3 Derivatives Financial Liabilities
 
     Financial liabilities at fair
value through profit or loss
 
     Derivatives  
     NT$  
     (In Thousands)  
As of January 1, 2024
   $ 1,019,362  
Recognized in loss (profit)
     (119,401 ) 
  
 
 
 
As of December 31, 2024
   $ 899,961  
  
 
 
 
 
     Financial liabilities at fair
value through profit or loss
 
     Derivatives  
     NT$  
     (In Thousands)  
As of January 1, 2025
   $ 899,961  
Recognized in loss (profit)
     (845,310 ) 
  
 
 
 
As of December 31, 2025
   $ 54,651  
  
 
 
 
Summary of Significant Unobservable Inputs of Fair Value Measurement in Level 3 Fair Value Hierarchy
Significant unobservable inputs of fair value measurement in Level 3 fair value hierarchy were as follows:
 
As of December 31, 2024
Category
  
Valuation technique
  
Significant
unobservable inputs
  
Quantitative
information
  
Interrelationship
between inputs and fair
value
  
Sensitivity analysis of
interrelationship between
inputs and fair value
Unlisted stock    Market approach   
Discount for lack of marketability
   0% - 50%   
The greater degree of lack of marketability, the lower the estimated fair value is determined.
  
A change of 5% in the discount for lack of marketability of the aforementioned fair values of unlisted stocks could decrease/increase the Company’s profit (loss) for the year ended December 31, 2024 by NT$309 million and NT$244 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2024 by NT$239 million.
Fund    Net asset value approach   
N/A
   N/A   
N/A
  
N/A
Convertible bonds
  
Binomial tree valuation model
  
Volatility
   54.85%   
The higher the volatility, the higher the estimated fair value is determined.
  
A change of 5% in the volatility could increase/decrease the Company’s profit (loss) for the year ended December 31, 2024 by NT$
0.3
 million and NT$
0.4
 million, respectively.
Embedded derivatives in exchangeable bonds
  
Binomial tree valuation model
  
Volatility
   28.06%   
The higher the volatility, the higher the estimated fair value is determined.
  
A change of 5% in the volatility
could
decrease/increase the Company’s profit (loss) for the year ended December 31, 2024 by NT$
97
million and NT$
113
 million, respectively.
 
 
As of December 31, 2025
Category
  
Valuation technique
  
Significant
unobservable inputs
  
Quantitative
information
  
Interrelationship
between inputs and fair
value
  
Sensitivity analysis of
interrelationship between
inputs and fair value
Unlisted stock    Market approach   
Discount for lack of marketability
   0% - 60%   
The greater degree of lack of marketability, the lower the estimated fair value is determined.
  
A change of 5% in the discount for lack of marketability of the aforementioned fair values of unlisted stocks could decrease/increase the Company’s profit (loss) for the year ended December 31, 2025 by NT$337 million and NT$306 million, respectively, and decrease/increase the Company’s other comprehensive income (loss) for the year ended December 31, 2025 by NT$213 million.
Fund    Net asset value approach   
N/A
   N/A   
N/A
  
N/A
Embedded derivatives in exchangeable bonds
  
Binomial tree valuation model
  
Volatility
  
25.06
%
  
The higher the volatility, the higher the estimated fair value is determined.
  
A change of 5% in the volatility could decrease/increase the Company’s profit (loss) for the year ended December 31, 2025 by NT$41 million and NT$31 million, respectively.
Recurring fair value measurement [member]  
Disclosure of detailed information about financial instruments [line items]  
Assets and Liabilities Measured and Recorded at Fair Value
  a.
Assets and liabilities measured and recorded at fair value on a recurring basis:
 
     As of December 31, 2024  
     Level 1      Level 2      Level 3      Total  
     NT$      NT$      NT$      NT$  
     (In Thousands)      (In Thousands)      (In Thousands)      (In Thousands)  
Financial assets:
           
Financial assets at fair value through profit or loss, current
   $ 606,016      $ 2      $ —       $ 606,018  
Financial assets at fair value through profit or loss, noncurrent
     5,703,325        18,800        12,128,789        17,850,914  
Financial assets at fair value through other comprehensive income, current
     5,893,377        —         —         5,893,377  
Financial assets at fair value through other comprehensive income, noncurrent
     7,879,553        —         3,436,398        11,315,951  
Financial liabilities:
           
Financial liabilities at fair value through profit or loss, current
     —         1,039        899,961        901,000  
     As of December 31, 2025  
     Level 1      Level 2      Level 3      Total  
     NT$      NT$      NT$      NT$  
     (In Thousands)      (In Thousands)      (In Thousands)      (In Thousands)  
Financial assets:
           
Financial assets at fair value through profit or loss, current
   $ 468,010      $ 1,859      $ 98,652      $ 568,521  
Financial assets at fair value through profit or loss, noncurrent
     5,838,381        20,600        11,726,414        17,585,395  
Financial assets at fair value through other comprehensive income, current
     4,630,441        —         —         4,630,441  
Financial assets at fair value through other comprehensive income, noncurrent
     5,990,762        —         3,153,546        9,144,308  
Financial liabilities:
           
Financial liabilities at fair value through profit or loss, current
     —         2,512        54,651        57,163  
Not measured at fair value in statement of financial position but for which fair value is disclosed [member]  
Disclosure of detailed information about financial instruments [line items]  
Assets and Liabilities Measured and Recorded at Fair Value
        
As of December 31, 2024
                                 
            Fair value measurements during
reporting period using
        
Items
   Fair value      Level 1     Level 2      Level 3      Carrying
amount
 
     NT$
(In Thousands)
     NT$
(In Thousands)
    NT$
(In Thousands)
     NT$
(In Thousands)
     NT$
(In Thousands)
 
Bonds payable (current portion included)
   $ 30,020,005      $ 24,409,952     $ 5,610,053      $ —       $ 30,051,568  
Long-term loans (current portion included)
     36,476,909        —        36,476,909        —         36,476,909  
 
 
        
As of December 31, 2025
  
 
 
  
 
 
 
 
 
  
 
 
  
 
 
 
  
 
 
  
Fair value measurements during
reporting period using
 
  
 
 
Items
  
Fair value
 
  
Level 1
 
 
Level 2
 
  
Level 3
 
  
Carrying
amount
 
 
  
NT$
(In Thousands)
 
  
NT$
(In Thousands)
 
 
NT$
(In Thousands)
 
  
NT$
(In Thousands)
 
  
NT$
(In Thousands)
 
Bonds payable (current portion included)
   $ 50,253,543      $ 44,541,910     $ 5,711,633      $ —       $ 50,228,305  
Long-term loans (current portion included)
     14,331,790        —        14,331,790        —         14,331,790