AI boom drives Taiwan's semiconductor testing industry into record expansion

Taiwan’s OSAT sector is embarking on a capital-spending surge—projected at NT$400 billion in 2026—not merely to meet AI demand, but to win a technological arms race in advanced packaging and test. The shift toward CoWoS and InFO demands unprecedented precision in thermal management, signal integrity, and yield analytics, reshaping upstream supply chains for probe cards and high-speed ATE. While U.S. CHIPS Act incentives lure some capacity offshore, Taiwan retains dominance in high-end test nodes thanks to its ecosystem density, albeit at rising compliance costs from export controls and localization mandates. Market leaders like ASE and SPIL are locking in NVIDIA and AMD partnerships, forcing Chinese OSAT rivals to accelerate HBM3/4 test capability development. Over the next 18 months, the sector will consolidate around a few capital-rich players; those without anchor AI clients face exclusion from the premium segment.