Debt (Tables)

9 Months Ended

Sep. 30, 2025

Schedule of Short-Term Borrowings and Long-Term Debt

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


	September 30, 2025		December 31, 2024
	(In thousands)
Debt of Amkor Technology, Inc.:
Senior notes:
6.625% Senior notes, due September 2027 (1)	$	400,000	$	525,000
5.875% Senior notes, due October 2033 (2)	500,000		—
Other:
2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 (3)	—		—
Term A Loans, applicable bank rate plus 1.75%, 5.74% as of September 30, 2025, due May 2030 (4)	500,000		—
Debt of subsidiaries:
Amkor Technology Korea, Inc.:
Term loan, fixed rate at 3.95%, due May 2027 (5)	—		—
Term loan, fixed rate at 2.12%, due December 2028	175,000		200,000
Amkor Technology Japan, Inc.:
Short-term term loans, variable rate (6)	—		—

Term loan, fixed rate at 1.20%, due December 2025	3,685		13,868
Term loan, fixed rate at 1.23%, due December 2026	22,143		33,333
Term loan, fixed rate at 1.59%, due December 2027	47,769		59,923
Term loan, fixed rate at 1.80%, due December 2028	76,910		89,059
Term loan, fixed rate at 2.05%, due December 2029	98,276		108,779
Amkor Assembly & Test (Shanghai) Co., Ltd.:
Term loans, SOFR plus 0.75%, due June 2025	—		35,000
Term loans, SOFR plus 0.75%, due 2025 (4)	—		55,500
Term loans, SOFR plus 0.95%, due December 2026 (4)	—		44,000
	1,823,783		1,164,462
Less: Unamortized discount and deferred debt costs, net	(11,835)		(5,002)
Less: Short-term borrowings and current portion of long-term debt	(547,447)		(236,029)
Long-term debt	$	1,264,501	$	923,431

(1)In July 2025, we redeemed $125.0 million (“July Redemption”) of our 6.625% Senior Notes due September 2027 (“2027 Notes”). In September 2025, we issued a redemption notice (“September Redemption” and, together with the July Redemption, the “2027 Notes Redemptions”) for the remaining amounts due under our 2027 Notes, which was completed in October 2025. The 2027 Notes Redemptions were funded with a portion of the net proceeds from the $500.0 million Term A Loans and a portion of the net proceeds from our issuance of the 2033 Notes described below. In accordance with the terms of the indenture governing the 2027 Notes, the redemption price for the 2027 Notes Redemptions was 100% of the principal amount of the 2027 Notes plus accrued and unpaid interest. As a result of the 2027 Notes Redemptions, we expect to record $1.8 million in charges for the early extinguishment of debt related costs, of which $0.5 million was recorded in the third quarter of 2025 with the remaining amount to be recorded in fourth quarter of 2025.

(2)In September 2025, we issued $500.0 million of 5.875% Senior Notes due October 2033 (“2033 Notes”). The 2033 Notes were issued at par value and are senior unsecured obligations guaranteed by our wholly-owned subsidiary, Guardian Assets, Inc. (“Guardian”). Interest is payable semiannually on April 1 and October 1 of each year, commencing April 1, 2026. We incurred $6.7 million of debt issuance costs associated with the 2033 Notes. The proceeds will be used for the September Redemption and general corporate purposes.

(3)In May 2025, we entered into a $1.0 billion senior secured revolving credit facility (the “2025 Revolving Credit Facility”) guaranteed by Amkor Technology Singapore Holding Pte. Ltd. (“ATSH”) and Guardian that replaced an existing revolving credit facility guaranteed by ATSH and Guardian. The maximum borrowing capacity under the 2025 Revolving Credit Facility is $1.0 billion. The 2025 Revolving Credit Facility includes an uncommitted optional accordion of up to $200.0 million, which may be incurred in the form of revolving commitment increases or term loans. As of September 30, 2025, $1.0 billion was available for future borrowings under the 2025 Revolving Credit Facility.

(4)In June 2025, we amended the 2025 Revolving Credit Facility and created a new tranche of term loans (the “Term A Loans”), which are secured and guaranteed on a pari passu basis to the revolver loans under the existing agreement. The Term A Loans have an aggregate principal amount of $500.0 million and will mature in May 2030. The payments are subject to 2.5% amortization of the original principal amount per year in 2026 and 2027, and 5% thereafter, payable quarterly, with the remaining balance due at maturity. The proceeds were used for the July Redemption, prepayment of outstanding term loans of Amkor Assembly & Test (Shanghai) Co., Ltd. (“AATS Loans”) and general corporate purposes.

(5)In April 2021, we entered into a ₩80.0 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%. As of September 30, 2025, ₩80.0 billion, or approximately $57 million, was available to be drawn.

(6)We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. As of September 30, 2025, $3.4 million was available to be drawn.