Unimicron Technology is looking to raise as much as $1.4bn from a sale of global depositary shares, joining the long line of companies cashing in on investors’ appetite for anything tied to artificial intelligence.

The Taiwanese firm is selling 50 million shares at $26.96 to $27.76 each, a discount of roughly 3% to 6% to its recent close in Taipei, according to Bloomberg. It is the kind of raise that only makes sense in a market as forgiving as this one, where the AI chip build-out has pulled valuations up across the supply chain.

Unimicron is not a name most consumers would recognise, but it occupies an increasingly critical link in that chain. It makes printed circuit boards and the IC substrates that connect chips to the boards, the unglamorous plumbing that has become a genuine bottleneck as processors grow larger and more complex.

As chipmakers push toward advanced packaging, the substrate is no longer an afterthought.

That is the thread connecting a modest circuit-board supplier to the AI story. The most powerful accelerators now rely on advanced packaging techniques that stitch multiple dies and stacks of memory into a single module, and every one of those modules needs a high-end substrate to sit on. Demand for that layer has tightened alongside demand for the chips themselves.