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Debt | 9 Months Ended
--- | ---
Sep. 30, 2025
Debt Disclosure [Abstract] |
Debt | 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. Certain of our debt is collateralized by the land, buildings, equipment and capital stock of subsidiaries. As of September 30, 2025, the collateralized debt balance was $923.8 million, of which $656.8 million of assets and subsidiary capital stock were pledged as collateral. The debt of Amkor Technology, Inc. is structurally subordinated in right of payment to all existing and future debt and other liabilities of our subsidiaries. From time to time, Amkor Technology, Inc., ATSH and Guardian guarantee certain debt of our subsidiaries. The agreements governing our indebtedness contain affirmative and negative covenants, including, among others, covenants to maintain a minimum interest coverage ratio and a maximum consolidated leverage ratio, which restrict our ability to pay dividends and could restrict our operations. These restrictions do not currently have a material impact on our ability to make dividend payments or stock repurchases. We were in compliance with all debt covenants at September 30, 2025.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A Reference 2: http://www.xbrl.org/2003/role/disclosureRef 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