United Microelectronics approves approximately $3.2 billion in new capital spending

UMC is accelerating its expansion plans to meet the surging demand for artificial intelligence infrastructure. The company approved an additional capital expenditure budget of approximately $3.2 billion on October 28, 2026, to speed up facility expansions in Singapore and Tainan. This new spending sits on top of the company’s existing $2 billion cash-based CAPEX outlook for 2026.

The funds will be used to build specialized technologies crucial for AI, including advanced packaging, silicon photonics, silicon capacitors, and lithium niobate modulators. Silicon photonics uses light instead of electrical signals to move data between chips, while lithium niobate modulators help encode data onto light signals. UMC expects initial production ramps from these expansions by late 2028, with full capacity reached by 2030.

The announcement came alongside UMC’s third-quarter 2026 earnings, which showed a strong performance. The company reported record wafer shipments for the quarter, with revenue reaching NT$74.24 billion. This represented a 25.6% year-over-year increase and an 8% rise from the prior quarter. Operating margin came in at 25.1%, and capacity utilization was 92%.

Management projects approximately 10% year-over-year growth in blended average selling price (ASP) in 2027. The company also expects AI-related revenue to exceed 25% of total revenue by 2029. These projections were intended to justify the massive outlay to shareholders.

Despite the strong earnings, UMC shares fell around 9% on October 29, the day after the announcement. The primary concern was margin pressure. New fabs and equipment get depreciated over time, and higher operating expenses during an expansion can squeeze profitability before the new capacity generates revenue.

For investors, the key question is one of timing. The costs of this expansion will arrive relatively soon, while the payoff is scheduled for late 2028 through 2030. The 92% utilization rate is a reasonable argument for expanding, as a business running near capacity has limited room to take on new orders without adding factory space.

The specific technologies UMC is targeting focus on specialized areas like optical interconnects, packaging, and components such as silicon capacitors. AI infrastructure is not only about the processors themselves; data centers need ways to connect chips, move data efficiently, and package components together. Those are the niches UMC is pointing its capital toward.

Investors should watch several concrete markers. The first is whether the projected roughly 10% blended ASP growth in 2027 materializes. The second is the trajectory of operating margin from its 25.1% level as expansion costs begin to hit. The third is progress toward the goal of AI-related revenue topping 25% of total revenue by 2029. Finally, the late 2028 production ramp in Singapore and Tainan is the milestone that turns spending into sales.