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Debt (Tables)

12 Months Ended

Dec. 31, 2024

Debt Disclosure [Abstract]

Schedule of Short-term Borrowings and Long-term Debt

Short-term borrowings and long-term debt consist of the following:

			December 31,
			2024						2023
			(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:
6.625% Senior notes, due September 2027			$	525,000					$	525,000
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
Term loan, fixed rate at 3.95%, due May 2027 (1)			—						—
Term loan, fixed rate at 2.12%, due December 2028			200,000						200,000
Amkor Technology Japan, Inc.:
Short-term term loans, variable rate (2)			—						5,098
Term loan, fixed rate at 1.35%, due December 2024			—						40,414
Term loan, fixed rate at 1.20%, due December 2025			13,868						30,913
Term loan, fixed rate at 1.23%, due December 2026			33,333						55,729
Term loan, fixed rate at 1.59%, due December 2027			59,923						89,053
Term loan, fixed rate at 1.80%, due December 2028			89,059						124,078
Term loan, fixed rate at 2.05%, due December 2029 (3)			108,779						—
Amkor Assembly & Test (Shanghai) Co., Ltd.:
Term loans, SOFR plus 0.75%, due June 2025			35,000						37,000
Term loans, SOFR plus 0.75%, due 2025			55,500						57,500
Term loans, SOFR plus 0.95%, due December 2026 (4)			44,000						45,000
Other:
Senior secured revolving credit facility, applicable bank rate plus 1.75%, due March 2027 (Singapore) (5)			—						—
			1,164,462						1,209,785
Less: Unamortized discount and deferred debt costs, net			(5,002)						(6,329)
Less: Short-term borrowings and current portion of long-term debt			(236,029)						(131,624)
Long-term debt			$	923,431					$	1,071,832

(1)In April 2021, we entered into a ₩80 billion term loan agreement with the option to borrow and re-borrow the funds up to six times per year through April 2024 at a fixed rate of 1.85%. In May 2024, we replaced this loan by entering into a ₩80.0 billion (approximately $59 million) term loan agreement with the option to borrow and re-borrow the funds up to six times per year through May 2027. Principal is payable at maturity, and interest is payable monthly, at a fixed rate of 3.95%. During the year ended December 31, 2024, we borrowed $58.7 million, which we immediately repaid. As of December 31, 2024, ₩80.0 billion, or approximately $54 million, was available to be drawn.

(2)We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. As of December 31, 2024, $6.0 million was available to be drawn.

(3)In December 2024, we borrowed ¥17.1 billion (US$113.9 million) under a new term loan agreement due December 2029, guaranteed by Amkor Technology, Inc. and our subsidiary, ATSH. Principal is due in 20 equal, quarterly installments plus accrued interest, through maturity.

(4)In February 2024, Amkor Assembly & Test (Shanghai) Co. Ltd. amended the term loan due December 2026 to reduce the interest rate from SOFR plus 1.40% to SOFR plus 0.95%. This contractual amendment is treated as a modification with no recognized gain or loss.

(5)In March 2022, ATSH entered into the 2022 Singapore Revolver, which is guaranteed by Amkor Technology, Inc., ATT and AATT. The maximum borrowing capacity under the 2022 Singapore Revolver is limited to a base amount equal to the lesser of: (1) $600.0 million; or (2) $250.0 million plus a variable amount equal to 37.5% of our consolidated accounts receivable balance. As of December 31, 2024, $600.0 million was available for future borrowings under the 2022 Singapore Revolver.

Schedule of Interest Rates

Refer to the table above for the interest rates on our fixed-rate debt and to the table below for the interest rates on our variable-rate debt.

			December 31,
			2024						2023
Amkor Technology Japan, Inc:
Short-term term loans, variable rate			—		%				0.24		%
Amkor Assembly & Test (Shanghai) Co., Ltd.:
Term loans, SOFR plus 0.75% due June 2025			5.15		%				6.07		%
Term loans, SOFR plus 0.75%, due 2025			5.15		%				6.07		%
Term loans, SOFR plus 0.95%, due December 2026			5.28		%				6.76		%

Schedule of Maturities of Long-term Debt

Maturities

			Total Debt
			(In thousands)
Payments due for the year ending December 31,
2025			$	236,029
2026			173,662
2027			638,995
2028			94,020
2029			21,756
Thereafter			—
Total debt			$	1,164,462

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Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 470
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-1

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