AI Demand Propels ASE Technology (3711.TW), UMC (2303.TW) to Record Market Caps

ASE Technology Holding (3711.TW) and United Microelectronics Corp. (UMC) (2303.TW) saw their market capitalization surge to new highs on June 22, 2026, driven by robust demand for AI infrastructure. ASE Technology, the world's largest chip packager, reached TWD 3 trillion, while UMC, a mature process foundry, hit TWD 2 trillion. ASE Technology's stock price closed at TWD 674, a new record. UMC's shares also surged to TWD 160, pushing its market cap past Fubon Financial to become Taiwan's ninth-largest company. Additionally, DRAM producer Nanya Technology (2408.TW) saw its shares rise to TWD 505, achieving a market value of TWD 1.5 trillion. The strong AI demand is fueling shortages across advanced packaging, mature process manufacturing, and memory components, with memory supply expected to remain tight until 2030.