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Debt (Tables) | 6 Months Ended
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Jun. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Short-Term Borrowings and Long-Term Debt | Short-term borrowings and long-term debt consist of the following:
| June 30, 2025 |  | December 31, 2024
| (In thousands)
Debt of Amkor Technology, Inc.: |  |  |
6.625% Senior notes, due September 2027 (1) | $ | 525,000 |  |  | $ | 525,000 |
2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 (2) | — |  |  | — |
Term A Loans, applicable bank rate plus 1.75%, 6.05% as of June 30, 2025, due May 2030 (3) | 500,000 |  |  | — |
Debt of subsidiaries: |  |  |
Amkor Technology Korea, Inc.: |  |  |
Term loan, fixed rate at 3.95%, due May 2027 (4) | — |  |  | — |
Term loan, fixed rate at 2.12%, due December 2028 | 175,000 |  |  | 200,000 |
Amkor Technology Japan, Inc.: |  |  |
Short-term term loans, variable rate (5) | — |  |  | — |
Term loan, fixed rate at 1.20%, due December 2025 | 7,568 |  |  | 13,868 |
Term loan, fixed rate at 1.23%, due December 2026 | 27,286 |  |  | 33,333 |
Term loan, fixed rate at 1.59%, due December 2027 | 54,503 |  |  | 59,923 |
Term loan, fixed rate at 1.80%, due December 2028 | 85,052 |  |  | 89,059 |
Term loan, fixed rate at 2.05%, due December 2029 | 106,853 |  |  | 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%, weighted average of 5.04% as of June 30, 2025, due 2025 (6) | 54,500 |  |  | 55,500 |
Term loans, SOFR plus 0.95%, weighted average of 5.25% as of June 30, 2025, due December 2026 (6) | 43,500 |  |  | 44,000 |
| 1,579,262 |  |  | 1,164,462 |
Less: Unamortized discount and deferred debt costs, net | (6,217) |  |  | (5,002) |
Less: Short-term borrowings and current portion of long-term debt | (374,855) |  |  | (236,029) |
Long-term debt | $ | 1,198,190 |  |  | $ | 923,431 |
(1)In June 2025, we issued a redemption notice for $125.0 million of the outstanding $525.0 million of our 6.625% Senior Notes due September 2027 (the “Senior Notes”). The Senior Notes will be redeemed on July 30, 2025. In accordance with the terms of the indenture governing the Senior Notes, the redemption price was 100% of the principal amount of the Senior Notes plus accrued and unpaid interest. The redemption of the Senior Notes was funded with proceeds from the new $500.0 million Term A Loans described below. (2)In May 2025, we entered into a $1.0 billion senior secured revolving credit facility (the “2025 Revolving Credit Facility”) that replaced an existing revolving credit facility guaranteed by Amkor Technology Singapore Holding Pte. Ltd. (“ATSH”) and Guardian Assets, Inc. (“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 June 30, 2025, $1.0 billion was available for future borrowings under the 2025 Revolving Credit Facility. (3)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 will be used for the partial redemption of the Senior Notes, prepayment of outstanding term loans under Amkor Assembly & Test (Shanghai) Co., Ltd. (“AATS”) and general corporate purposes. (4)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 June 30, 2025, ₩80.0 billion, or approximately $59 million, was available to be drawn. (5)We entered into various short-term term loans which mature semiannually. Principal and interest are payable in monthly installments. As of June 30, 2025, $3.5 million was available to be drawn. (6)In June 2025, we issued a prepayment notice for the remaining $98.0 million of outstanding term loans under AATS (the “AATS Loans”). We repaid the AATS Loans in July 2025 with proceeds from the new Term A Loans described above.

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- Definition 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. + References No definition available. + Details
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