US Advanced Packaging Ecosystem Emerges as Critical Reshoring Node with TSMC-Amkor Alliance

US Advanced Packaging Ecosystem Emerges as Critical Reshoring Node with TSMC-Amkor Alliance

The U.S. semiconductor reshoring landscape is rapidly developing a crucial secondary layer: domestic advanced packaging. While high-volume silicon fabrication (front-end) gets significant attention, the physical packaging of chips (back-end) represents a major single point of failure if kept entirely offshore.¹ Amkor Technology, Inc. (AMKR) is leading the effort to establish a domestic advanced packaging node in Peoria, Arizona, though the transition is introducing significant near-term financial underutilization headwinds.

In its second-quarter 2026 results (reported July 27, 2026), Amkor delivered record revenue of $1.9 billion, representing a 26% year-over-year surge and outperforming the high end of its guidance. Gross profit rose 33% sequentially to $319 million, and adjusted EPS of $0.70 tripled compared to the first half of 2025, driven by higher factory utilization across its global network and record computing and automotive/industrial demand.

Key developments in the domestic advanced packaging ecosystem include:

• Landmark 10-Year TSMC Alliance: Amkor announced a 10-year advanced packaging agreement with TSMC. Under this framework, TSMC's leading-edge wafer fabrication at its Arizona fabs will be seamlessly paired with Amkor's advanced packaging and test services at its upcoming Peoria facility. This turnkey solution will support next-generation AI infrastructure, reducing cycle times and enabling faster time-to-market for major customers like NVIDIA.
• Peoria Construction & Capex: Amkor maintained its 2026 capital spending plan at $2.5 billion to $3 billion. Approximately 65% to 70% of this budget is dedicated to facilities expansion, including the first phase of its Arizona campus, which is designed to support 2.5D, high-density fan-out (HDFO), and emerging co-packaged optics technologies.
• Underutilization Margin Headwinds: While strategic, the massive Arizona investment will introduce severe near-term margin headwinds. Amkor CFO Megan Faust confirmed that initial underutilization and high depreciation costs associated with the ramping Peoria campus will weigh on earnings. Specifically, Amkor expects gross and operating margins in fiscal year 2028 to match 2026 levels due to these ramping underutilization pressures before associated high-volume revenues fully arrive.

The TSMC-Amkor alliance demonstrates that domestic semiconductor reshoring is transitioning from isolated "press release" megaprojects into a highly integrated, functional ecosystem. However, for investors, the financial reality of reshoring advanced packaging involves a multi-year period of high capital intensity and margin compression before these domestic facilities achieve profitable scale.

Verbatim Quotes

"First, we announced a 10-year advanced packaging agreement with TSMC. The agreement establishes a framework to expand advanced packaging and test capacity while strengthening the U.S. semiconductor supply chain. Together, we are working to provide customers with more integrated manufacturing solutions, spanning advanced silicon fabrication through advanced packaging and test." — Earnings call transcript: Amkor tops Q2 2026 estimates as stock slips

"So that's part of the bridge that you're trying to understand is why would '28 match '26 because there will be ramping underutilized Arizona manufacturing in both gross margin and operating margin in 2028." — Megan Faust, Executive Vice President and CFO, AMKR.OQ - Q2 2026 Amkor Technology Inc Earnings Call