Taipei, Jan 20, 2026, 09:50 GMT+8 — Regular session
- Shares of United Microelectronics climbed 3.36% to NT$64.6 in early trading, following a 6.84% surge on Monday
- Traders are betting on tighter supply for 8-inch wafers and potential price hikes from foundries
- UMC’s fourth-quarter results, due Jan. 28, are drawing investor attention
United Microelectronics Corp shares pushed higher Tuesday, climbing 3.36% to NT$64.6 by 9:49 a.m. in Taipei. The Taiwan-listed chipmaker saw trading range between NT$61.0 and NT$64.9 in the morning session. 1
This matters because UMC serves as a key indicator for demand in “mature node” foundries — the older manufacturing processes behind power, display, and industrial chips — a segment that’s been waiting on a price shift.
A TrendForce survey, cited by local media, highlights tightening supply in 8-inch foundry capacity this year, driven by production shifts at bigger rivals. The report warns wafer prices could rise between 5% and 20%, a critical factor for UMC’s margins if this trend persists. 2
UMC closed Monday up 6.84%, hitting NT$62.50 from Friday’s NT$58.50, MarketWatch reported. Yahoo Finance data showed the stock climbed as high as NT$63.50 on Monday, marking the peak of its 52-week range. 3
Taiwan chip stocks gained attention after Micron Technology announced a $1.8 billion purchase of a fabrication plant from Powerchip Semiconductor Manufacturing. Micron said the deal backs a phased DRAM production ramp starting in the second half of 2027. Powerchip, a key foundry on the island, also revealed plans for a long-term foundry partnership with Micron focused on advanced packaging. 4
An 8-inch wafer is a 200mm silicon wafer, an older size still widely used for power-management and other “peripheral” chips. TrendForce expects global 8-inch wafer utilization to reach 85%–90% by 2026. Some foundries have proposed price increases, though weak demand in consumer end-markets “may ultimately limit” how much those hikes stick. 5
UMC, Taiwan’s second-largest contract chipmaker, trades in both Taipei and New York. It focuses mainly on mature and specialty processes, steering clear of the cutting-edge nodes where Taiwan Semiconductor Manufacturing and Samsung Electronics lead. 6
The stock’s run leaves little margin for error: if customers are simply shifting orders ahead instead of boosting demand, or if pricing discussions start to slip, the trade could unravel fast.
Investors are turning their attention to UMC’s fourth-quarter earnings report and the investor call set for Jan. 28, seeking clues on utilization and pricing trends heading into 2026. The company will also release its January sales figures on Feb. 5, per its investor events calendar. 7
