Basis of Presentation. The Consolidated Financial Statements and related disclosures as of June 30, 2026, and for the three and six months ended June 30, 2026 and 2025, contained in this Form 10-Q (the “Consolidated Financial Statements”) are unaudited pursuant to the rules and regulations of the SEC. The December 31, 2025 Consolidated Balance Sheet data contained in this Form 10-Q was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America (“U.S. GAAP”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to SEC rules and regulations. In our opinion, the Consolidated Financial Statements include all adjustments (consisting only of normal recurring adjustments) necessary for the fair statement of the results for the interim periods and should be read in conjunction with the financial statements included in the 2025 Form 10-K. The results of operations for the three and six months ended June 30, 2026 are not necessarily indicative of the results to be expected for the full year ending December 31, 2026. Unless the context otherwise requires, all references to “Amkor,” “we,” “us” or “our” are to Amkor Technology, Inc. and its wholly and majority-owned subsidiaries. Certain prior year amounts have been recast to conform to current year presentation.

Use of Estimates. The Consolidated Financial Statements have been prepared in conformity with U.S. GAAP, using management’s best estimates and judgments where appropriate. These estimates and judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. The estimates and judgments will also affect the reported amounts for certain revenues and expenses during the reporting period. Actual results could differ materially from these estimates and judgments as a result of, for example, any worsening of the global business and economic environment.

Contract Liabilities. Contract liabilities were $393.0 million and $390.8 million as of June 30, 2026 and December 31, 2025, respectively. As of June 30, 2026 and December 31, 2025, the short-term portions of the liabilities were $93.1 million and $69.6 million, respectively. Of the remaining contract liability balance as of June 30, 2026, $284.6 million is expected to be recognized in revenue over the next 1-5 years, and $15.3 million over the next 5-10 years. Revenue recognized during the six months ended June 30, 2026 and 2025 that was included in the contract liabilities balance at the beginning of the period was $27.8 million and $36.6 million, respectively. As of June 30, 2026, $100.0 million of standby letters of credit were issued and outstanding related to customer advance payments received. In July 2026, we received $100.0 million of customer advance payments and issued the related standby letters of credit.

Grant Accounting. From time to time, we may receive grants from governmental agencies. We recognize grants in our financial statements when there is reasonable assurance that we will comply with conditions attached to the grants and the grants will be received. Investment tax credits and grants receivable recorded reduce the carrying amounts of the qualifying property, plant and equipment in our Consolidated Balance Sheets.

In July 2026, certain of our subsidiaries entered into a Foreign Direct Investment Cash Support Agreement with governmental authorities in the Republic of Korea pursuant to applicable foreign investment promotion laws. The agreement provides for potential cash grants of up to approximately ₩150 billion (approximately $100 million), subject to the subsidiaries’ achievement of specified investment, employment and other performance conditions over a multi‑year period. We have not received any amounts related to this agreement.

Recently Issued Standards. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”), which was subsequently amended and clarified. ASU 2024-03 requires disaggregation of key expense categories such as inventory purchases, employee compensation, depreciation and intangible asset amortization in the financial statements. ASU 2024-03 is effective for annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. Adoption of this ASU should be applied either prospectively after the effective date or retrospectively to any or all periods presented in the financial statements. We are currently evaluating the impact of this new standard on our financial statements, which is expected to result in enhanced disclosures.

In September 2025, the FASB issued ASU 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40) (“ASU 2025-06”). ASU 2025-06 removes all references to project stages throughout ASC 350-40 and clarifies the applicable threshold to begin capitalizing costs. ASU 2025-06 is effective for annual reporting periods beginning after December 15, 2027, and interim periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period. Adoption of this ASU should be applied using a prospective transition approach, a modified transition approach based on project status or a retrospective transition approach. We are currently evaluating the impact of this new standard on our financial statements and disclosures.

In December 2025, the FASB issued ASU 2025-10, Government Grants (Topic 832) (“ASU 2025-10”). ASU 2025-10 provides guidance on the accounting for government grants received by a business entity, including grants related to assets and grants related to income. ASU 2025-10 is effective for annual reporting periods beginning after December 15, 2028, and interim periods within those annual reporting periods. Early adoption is permitted as of the beginning of an annual reporting period. Adoption of this ASU should be applied using the following transition methods: (i) a modified prospective approach for government grants that are entered into on or after, or not complete as of, the effective date; (ii) a modified retrospective approach for government grants that are entered into on or after, or not complete as of, the beginning of earliest period presented; or (iii) a retrospective approach for all government grants. We are currently evaluating the impact of this new standard on our financial statements and disclosures.