Business Context and Reporting Period
Company: Amkor Technology, Inc. (AMKR)
Filing Type: Form 10-K (Annual Report)
Reporting Period: Fiscal Year Ended December 31, 2025
Business Overview: Amkor is the world's largest U.S.-headquartered outsourced semiconductor assembly and test (OSAT) provider. The company offers advanced packaging, wafer-level processing, and system-in-package solutions for smartphones, data centers, artificial intelligence (AI), automotive, and wearable applications. Operations are geographically diverse with facilities in Asia, Europe, and the United States, including a new facility under construction in Arizona.
Key Financial Metrics
| Metric | 2025 | 2024 | Change |
|---|---|---|---|
| Net Sales | $6,708.0 million | $6,317.7 million | +6.2% |
| Gross Profit | $938.6 million | $933.2 million | +0.6% |
| Gross Margin | 14.0% | 14.8% | -0.8 pts |
| Operating Income | $467.4 million | $438.5 million | +6.6% |
| Operating Margin | 7.0% | 6.9% | +0.1 pts |
| Net Income (Attributable to Amkor) | $373.9 million | $354.0 million | +5.6% |
| Diluted EPS | $1.50 | $1.43 | +4.9% |
| Operating Cash Flow | $1,095.6 million | $1,088.9 million | +0.6% |
| Free Cash Flow | $307.9 million | $359.3 million | -14.3% |
| Capital Expenditures | $904.6 million | $743.8 million | +21.6% |
| Total Debt | $1,445.2 million | $1,159.5 million | +24.6% |
| Cash & Short-Term Investments | $1,991.4 million | $1,646.5 million | +21.0% |
Material Changes vs. Prior Period
- Revenue Growth: Net sales increased 6.2% driven by higher sales across all end markets. The computing segment grew 16% (AI-related PC devices and networking), automotive/industrial grew 8% (ADAS applications), and consumer/communications grew 9% and 1% respectively.
- Margin Compression: Gross margin declined to 14.0% from 14.8% due to increased overhead and employee compensation costs, partially offset by higher factory utilization. The ramp-up of the Vietnam Facility also constrained margins.
- Operating Income Boost: Operating income margin improved slightly to 7.0%, aided by a $32.4 million net receipt from the Nanium insolvency proceedings and lower Vietnam start-up costs compared to 2024.
- Capital Spending Surge: Capital expenditures rose to $904.6 million (13.5% of sales) from $743.8 million, primarily funding advanced packaging equipment and the Arizona Facility construction.
- Debt Restructuring: Total debt increased significantly due to the issuance of $500 million in 5.875% Senior Notes (2033) and $500 million in Term A Loans. These proceeds were used to redeem the 2027 Senior Notes and repay subsidiary loans.
Guidance, Outlook, and Risks
- 2026 Capital Expenditure Guidance: Management expects 2026 capital expenditures to range between $2.5 billion and $3.0 billion, a substantial increase driven by the construction of the Arizona Facility.
- Arizona Facility: Construction began in the second half of 2025. The facility is expected to have approximately 1.8 million square feet, with manufacturing anticipated to begin in the first half of 2028. The company has been awarded up to $407 million in direct funding under the CHIPS Act, contingent on meeting milestones.
- Dividend: The Board approved a quarterly dividend of $0.08352 per share in November 2025, a 1% increase from the prior year.
- Key Risks:
- Customer Concentration: The top 10 customers accounted for 72% of net sales in 2025. Apple and Qualcomm individually represented 29.8% and 11.1% of sales, respectively.
- Geopolitical & Trade: Exposure to U.S.-China trade tensions, export controls (BIS Regulations), and regional conflicts (Ukraine, Israel) could disrupt supply chains and limit sales to certain Chinese entities.
- Tax Rate Volatility: The effective tax rate was 15.4% in 2025. Future rates may increase as conditional reduced tax rates in Korea, Singapore, and Vietnam expire or due to global minimum tax (Pillar Two) implementations.
- Interest Rate Risk: A significant portion of debt is variable-rate; rising rates would increase debt service obligations.
Investor Verification Checklist
- Arizona Facility Progress: Verify construction milestones and the timeline for receiving the $407 million CHIPS Act funding, as delays could impact liquidity and capex plans.
- Customer Concentration: Monitor order volumes from Apple and Qualcomm, as their combined 40.9% share creates significant revenue volatility risk.
- Margin Trajectory: Assess whether gross margins can recover as the Vietnam Facility reaches full utilization and if overhead costs stabilize.
- Debt Servicing: Review the impact of the new $1 billion in debt (2033 Notes and Term A Loans) on future interest expense and free cash flow, especially given the variable-rate exposure.
- Tax Rate Sustainability: Evaluate the impact of expiring tax holidays in key jurisdictions (Singapore, Korea, Vietnam) on the effective tax rate in 2026 and beyond.