Unimicron aims for $1.4B share sale to fund AI chip capacity

Unimicron, a supplier of advanced circuit substrates to Apple and Nvidia, plans to raise up to $1.4 billion through a global depositary share offering. The company said the funds will support expansion of substrate capacity for advanced chip packaging, driven by demand from AI chip customers.

Unimicron makes ABF (Ajinomoto build-up film) substrates, a critical component in high-performance chips used in data center AI accelerators and premium smartphones. The substrates connect the silicon die to the circuit board. TSMC and Intel have both flagged substrate shortages as a constraint on advanced packaging output.

The offering comes as AI chip demand continues to outpace supply. Nvidia's latest Blackwell architecture and Apple's M-series processors rely on advanced packaging that uses ABF substrates. Any capacity expansion at Unimicron directly affects how many of those chips can ship.

For Apple and Nvidia, the capital raise carries two implications. First, the expansion will increase substrate supply, easing a constraint that has limited chip shipments. Second, the cost of that expansion will eventually flow through to chip prices. Unimicron's pricing power in a tight market means its customers may face higher substrate costs in future quarters.

The depositary share structure allows foreign investors to buy into the offering without direct exposure to Taiwan's stock exchange. Unimicron is based in Taiwan and already trades on the Taipei Exchange. The global depositary shares will list on the Luxembourg Stock Exchange, according to the company's filing. The funds will be used to purchase raw materials denominated in foreign currencies, the company said.

Nvidia, a key customer, trades at $194.83, down 1.39% on the session, with an AlphaScala Score of 68. Apple shares were little changed. Semiconductor supply chain stocks have drawn attention as AI capital expenditure ramps.

Investors will focus on the pricing of the offering and the specific use of proceeds. Unimicron has said the funds will go toward raw materials and capacity expansion. The company did not disclose a timeline for the sale. Such offerings typically price within two to four weeks of announcement.

The move follows similar capital raises by other substrate makers. Ibiden, a Japanese competitor, announced a ¥200 billion bond issuance in March to fund substrate capacity.

For Apple and Nvidia, the offering means substrate supply is not a fixed constraint. Unimicron's $1.4 billion bet reflects its expectation that demand will justify the investment, the company said. The risk is that the offering dilutes existing shareholders. The long-term payoff depends on whether AI chip demand sustains its current trajectory.

The sale is expected to price in the coming weeks.