Amkor Technology

Amkor Technology, Inc. (NASDAQ: AMKR) was founded in 1968 and is headquartered in Tempe, Arizona, with major manufacturing operations in South Korea, Japan, Taiwan, Vietnam, Portugal, and Malaysia. As the world's second-largest OSAT with approximately 15% global revenue share, Amkor packages dies across the full spectrum of semiconductor applications — from advanced AI accelerators to automotive chips and mobile SoCs. For AI workloads, Amkor's most relevant capabilities are its advanced flip-chip packaging lines, 2.5D silicon interposer assembly, and SLIM (Substrate-Less Interconnect Module) technology. SLIM eliminates the organic substrate layer between die and PCB, reducing package thickness and improving thermal and electrical performance — critical for dense GPU server boards where space and heat dissipation are constrained. Amkor has a strategic partnership with Apple that provides significant revenue but also technology pull: Apple's stringent requirements for iPhone and Mac silicon packaging have driven Amkor to develop ultra-fine bump pitch flip-chip processes and high-density fan-out that are now available to AI chip customers. NVIDIA's recent Blackwell-era packaging diversification across OSAT vendors includes Amkor's advanced flip-chip lines in South Korea. Geographic risk is a key consideration in OSAT. Approximately 70% of global advanced packaging capacity is concentrated in Taiwan. Amkor's Korea and Vietnam facilities — combined with its US ATMP (Advanced Test, Mask and Package) plant in Peoria, Arizona — provide hyperscalers and chip designers with supply chain resilience outside Taiwan's geopolitical exposure. The OSAT industry faces a structural inflection as AI chips move from monolithic dies toward chiplet-based designs that require 3D stacking and high-bandwidth interposers. Amkor has invested in advanced substrate design, copper pillar bump processes, and thermal compression bonding (TCB) to compete with TSMC's own advanced CoWoS and SoIC packaging offerings.