TSMC’s CoW outsourcing spurs OSAT capacity push amid AI packaging bottleneck

TSMC's outsourcing of the CoW stage in CoWoS packaging signals a bottleneck in AI chip assembly capacity. This move will prompt OSAT vendors to ramp up production, reshaping the tech stack. Upstream wafer foundries face capacity diversion, while midstream packaging firms seek to elevate technical barriers and capture high-end orders. From a compliance standpoint, this shift may trigger supply chain reassessment, especially amid U.S.-China tech decoupling, forcing companies to balance cost and self-reliance. Competitors like Amkor and Powerchip may accelerate investments in advanced packaging to seize AI chip market share. Over the next 12–24 months, the packaging segment will become the most contested area in the semiconductor value chain, with capital concentrating on OSATs with advanced capabilities, reshaping industry competition.