Amkor Technology, Inc. is the world's largest U. S. headquartered outsourced semiconductor assembly and test service provider, operating as a global leader in outsourced semiconductor packaging and test services. The company provides turnkey packaging and test solutions that enable leading semiconductor and electronics companies to bring advanced technologies to market for applications in smartphones, data centers, artificial intelligence, automobiles, and wearables. Amkor delivers these services to integrated device manufacturers, fabless semiconductor companies, original equipment manufacturers, and contract foundries worldwide.

Amkor generates revenue through its comprehensive portfolio of packaging and test services, which include wafer bump, wafer probe, wafer back-grind, package design, packaging, burn-in, system level and final test, and drop shipment services. The company categorizes its offerings into Advanced Products and Mainstream Products, with Advanced Products comprising flip chip, memory, wafer-level processing, and related test services, while Mainstream Products include wirebond packaging, power device packaging, and related test services. Revenue is derived from serving customers who outsource their packaging and test needs to leverage Amkor's expertise, scale, and geographic footprint.

The company operates through the following segments: Advanced Products and Mainstream Products.

• Advanced Products include flip-chip chip-scale packages, flip chip ball grid array, memory, and wafer-level packages, utilizing flip chip interconnect technology for applications requiring small form factors, high performance, and advanced integration such as 2.5D and system-in-package solutions.

• Mainstream Products use wirebond interconnect technology to connect dies to leadframes or substrates, encompassing leadframe packages, substrate-based wirebond packages, and micro-electro-mechanical systems packages, serving cost-sensitive applications in analog, mixed signal, and power devices.

Amkor holds a leading position in the global outsourced semiconductor packaging and test market, competing primarily with ASE Technology, JCET Group, and Powertech Technology, while also facing competition from contract foundries and electronic manufacturing service providers offering select advanced packaging solutions. The company's competitive advantages stem from its technology leadership in advanced packaging, geographically diverse manufacturing footprint, long-standing customer relationships, and focus on high-growth end markets such as artificial intelligence, automotive, and high-performance computing.

Amkor serves a global customer base that includes most of the world's largest semiconductor companies, with direct sales to Apple and Qualcomm accounting for 29.8% and 11.1% of net sales, respectively, for the year ended December 31, 2025. The company's ten largest customers collectively represented 72% of net sales in 2025, reflecting deep partnerships with industry leaders across communications, computing, automotive, and consumer electronics sectors.