Advanced Packaging (CoWoS)Narrow moat

As raw transistor scaling slows, an ever-larger share of a chip's performance comes from how its pieces are packaged and connected — and TSMC has made itself indispensable here too. Its advanced-packaging technologies, above all CoWoS (chip-on-wafer-on-substrate)¹, stitch together the processor and the high-bandwidth memory that make up a modern AI accelerator, and they have become essential to building leading AI chips. Nvidia's accelerators — and those of every serious AI-chip designer — depend on TSMC's advanced packaging, and TSMC's packaging capacity has² been one of the critical bottlenecks gating the entire AI industry's supply.

Advanced packaging deepens the moat in a powerful way: it means TSMC controls not just the making of the leading-edge chips but an indispensable step in assembling them into the final product. A customer relies on TSMC for both the silicon and the packaging that turns it into a usable accelerator, doubling the dependence and the switching cost. And because packaging capacity has been scarce and TSMC has led in building it, the company holds a second chokepoint in the AI supply chain alongside its manufacturing dominance. As performance gains shift further toward packaging and integration, TSMC's early and heavy investment in these technologies extends its indispensability into the next axis of advancement — ensuring that even as the nature of chip progress evolves, the road still runs through TSMC. It is the moat adapting to, and capturing, the industry's next frontier.