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Significant Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2023

Key management personnel compensation


	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Short-term employee benefits	$	562,117	$	2,047,118	$	1,462,964
Post-employment benefits		2,322		2,782		2,732
Share-based payment		1,035,401		719,786		500,391
Others		578		649		618

Total	$	1,600,418	$	2,770,335	$	1,966,705

Subsidiaries [member]

Statement [Line Items]

Significant Transactions Between the Company and Related Parties

Significant intercompany transactions between consolidated entities were as follows:

For the year ended December 31, 2021


Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	48,440,369		Net 60 days
UMC	UMC-USA	Accounts receivable		6,286,428		—
UMC	USCXM	Sales		1,222,320 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		29,012		—
UMC	UDS	Sales		178,331		Net 30 days
UMC	UDS	Accounts receivable		18,818		—
USJC	UMC-USA	Sales		2,917,993		Net 60 days
USJC	UMC-USA	Accounts receivable		428,363		—
USCXM	UMC-USA	Sales		1,444,736		Net 60 days
USCXM	UMC-USA	Accounts receivable		221,375		—
WAVETEK	UMC-USA	Sales		545,785		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		126,580		—
WAVETEK	UMC	Sales		110,620		Month-end 30 days
HJ	UMC-USA	Sales		366,968		Net 60 days
HJ	UMC-USA	Accounts receivable		60,147		—

For the year ended December 31, 2022


Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	68,554,072		Net 60 days
UMC	UMC-USA	Accounts receivable		9,502,922		—
UMC	USCXM	Sales		1,143,280 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		16,774		—
UMC	UDS	Sales		656,472		Net 30 days
UMC	UDS	Accounts receivable		6,734		—
UMC	USJC	Sales		164,855		Net 60 days
UMC	USJC	Accounts receivable		151,430		—
USJC	UMC-USA	Sales		4,272,900		Net 60 days
USJC	UMC-USA	Accounts receivable		744,082		—
USCXM	UMC-USA	Sales		1,565,670		Net 60 days
USCXM	UMC-USA	Accounts receivable		310,431		—
USCXM	UMC	Sales		1,035,407		Net 30 days - Net 45 days
USCXM	UMC	Accounts receivable		173		—
USCXM	UDS	Sales		148,259		Month-end 30 days
USCXM	UDS	Accounts receivable		171		—
WAVETEK	UMC-USA	Sales		716,357		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		81,819		—
WAVETEK	UMC	Sales		124,178		Month-end 30 days
HJ	UMC-USA	Sales		551,913		Net 60 days
HJ	UMC-USA	Accounts receivable		147,265		—
HJ	UDS	Sales		311,972		Month-end 30 days
HJ	UDS	Accounts receivable		9,500		—

For the year ended December 31, 2023


Entity	Counterparty	Transactions (Note A)
		Account	Amount			Terms (Note B)
		Account	Amount			Terms (Note B)
			NT$
			(In Thousands)
UMC	UMC-USA	Sales	$	61,923,652		Net 60 days
UMC	UMC-USA	Accounts receivable		5,827,800		—
UMC	USCXM	Sales		1,127,275 (Note C	)	Net 30 days
UMC	USCXM	Accounts receivable		11,688		—
UMC	UDS	Sales		364,948		Net 30 days
UMC	UDS	Accounts receivable		10,800		—
USJC	UMC-USA	Sales		3,487,292		Net 60 days
USJC	UMC-USA	Accounts receivable		342,835		—
USCXM	UMC-USA	Sales		1,208,630		Net 60 days
USCXM	UMC-USA	Accounts receivable		17,816		—
USCXM	UMC	Sales		134,303		Net 30 days - Net 45 days
USCXM	UDS	Sales		286,087		Month-end 30 days
USCXM	UDS	Accounts receivable		362		—
WAVETEK	UMC-USA	Sales		505,806		Net 60 days
WAVETEK	UMC-USA	Accounts receivable		53,916		—
HJ	UMC-USA	Sales		384,067		Net 60 days
HJ	UMC-USA	Accounts receivable		43,863		—
HJ	UDS	Sales		159,523		Month-end 30 days
HJ	UDS	Accounts receivable		2,696		—

Note A:

The significant intercompany transactions listed above include downstream and upstream transactions.

Note B:

The sales price to the above related parties was determined through mutual agreement in reference to market conditions.

Note C:

UMC authorized technology licenses to its subsidiary, USCXM, in the amount of US$0.35 billion, which was recognized as deferred revenue to be realized over time.

Other related parties [member]

Statement [Line Items]

Significant Transactions Between the Company and Related Parties

Significant transactions between the Company and other related parties were as follows:

(i)

Name and Relationship of Related Parties


		Name of related parties		Relationship with the Company
		FARADAY TECHNOLOGY CORP. and its Subsidiaries		Associate
		UNIMICRON TECHNOLOGY CORP.		Associate
		SILICON INTEGRATED SYSTEMS CORP.		Associate (Note)
		PHOTRONICS DNP MASK CORPORATION		Other related party
		XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD.		Directors and supervisors of subsidiaries
		FUJIAN ELECTRONICS & INFORMATION INDUSTRY ENTREPRENEURSHIP INVESTMENT LIMITED PARTNERSHIP		Directors of subsidiaries

Note: Prior to August 2023, SIS held one board seat on UMC’s Board of Directors. Therefore, SIS was classified as other related party. Beginning from August 2023, the Company determines that it has significant influence over SIS and accounts for its investment in SIS as an associate. Please refer to Note 6(7) for the relevant information.

(ii)

Operating revenues


	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Associates	$	2,778,544	$	5,744,098	$	3,018,171
Other related party		38,797		40,474		4,463

Total	$	2,817,341	$	5,784,572	$	3,022,634

(iii)

Accounts receivable, net


	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates
FARADAY TECHNOLOGY CORP. and its Subsidiaries
FARADAY TECHNOLOGY CORP.	$	441,963	$	302,828
ARTERY TECHNOLOGY CORPORATION, LTD.		56,864		40,886
Others		30,698		3,602
Other associates		—		648
Other related party		1,052		—

Total	$	530,577	$	347,964

The sales price to the above related parties was determined through mutual agreement in reference to market conditions. The collection periods for domestic sales to related parties were

month-end

days, while the collection periods for overseas sales were

month-end

days.

(iv)

Refund liabilities (classified under other current liabilities)


	As of December 31,
	2022		2023
	NT$		NT$
	(In Thousands)		(In Thousands)
Associates	$	1,545	$	636
Other related party		7		—

Total	$	1,552	$	636

(v)

Significant asset transactions

Acquisition of financial assets at fair value through profit or loss, noncurrent

For the year ended December 31, 2021:


	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		82	Stock of ARTERY TECHNOLOGY CORPORATION	$	13,929

For the years ended December 31, 2022 and 2023: None.

Acquisition of subsidiaries’ ownership

For the years ended December 31, 2021 and 2022: None.

For the year ended December 31, 2023:


	Trading Capital Amount		Transaction underlying		Purchase price
	RMB¥				NT$
	(In Thousands)				(In Thousands)
XIAMEN JINYUAN INDUSTRIAL DEVELOPMENT CO., LTD.		3,741,862		Ownership of USCXM	$	17,945,970
FUJIAN ELECTRONICS & INFORMATION INDUSTRY ENTREPRENEURSHIP INVESTMENT LIMITED PARTNERSHIP		674,762		Ownership of USCXM		3,263,473

Total		4,416,624			$	21,209,443

Please refer to Note 9(6) for the relevant information.

Acquisition of investments accounted for under the equity method

For the years ended December 31, 2021 and 2022: None.

For the year ended December 31, 2023:


	Trading Volume (In thousands of shares)		Transaction underlying	Purchase price
				NT$
				(In Thousands)
Associates		4,945	Stock of UNIMICRON	$	608,224

Please refer to Note 6(7) for the relevant information.

Acquisition of intangible assets


	Purchase price
	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
FARADAY TECHNOLOGY CORP.	$	181,254	$	266,053	$	323,551


(vi) Others

Mask expenditure
	For the years ended December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Other related party	$	1,861,438	$	2,581,409	$	2,375,225


Other payables of mask expenditure

	As of December 31,
	2021		2022		2023
	NT$		NT$		NT$
	(In Thousands)		(In Thousands)		(In Thousands)
Other related party	$	560,042	$	812,185	$	751,763