UMC briefing — United Microelectronics Corporation

Released: 2026-04-27 Briefing series: #1 of N Prior briefing: first in series Stock at release: $11.69 Inflection pattern: quiet_compounder

What changed since the last briefing

(This is the first briefing in the series.)

Company snapshot

• Ticker: UMC
• Name: United Microelectronics Corporation
• What they do: UMC is a Taiwan-based specialty semiconductor foundry that manufactures integrated circuits for fabless semiconductor companies and IDMs across mature process nodes (primarily 28nm and above), focusing on automotive, industrial, IoT, and communications applications; it does not compete in leading-edge (below 22nm) foundry services. (20-F FY2024, filed 2025-04-24)
• IPO date: Listed on NYSE as ADS in 2000; first candle in data: 2021-04-28
• Sector / Industry: Technology / Semiconductor Foundry (Specialty/Mature Nodes)
• HQ: Hsinchu Science Park, Hsinchu, Taiwan, R.O.C.
• CEO / Founder status: Jason Wang appointed new CEO in February 2026, replacing the co-president structure that was in place since 2021; CFO is Chitung Liu. Professional management throughout. (6-K, filed 2026-02-25)
• Profitable?: Yes — net income attributable to shareholders of the parent NT$10,870M in Q3 2025; FY2025 full-year data [DATA NEEDED from complete 20-F]. (6-K Q3 2025 earnings, filed 2025-10-30)
• Total shares outstanding: ~4,436M shares (including treasury stock per Q3 2025 data); each ADS represents 2 common shares. (6-K Q3 2025, filed 2025-10-30)
• Fiscal year end: December
• Market cap at release: ~$11.69 per ADS × ~2.2B ADSs (4,436M shares ÷ 2) = ~$25.7B

The arc

| Date | Event | Source | |------|-------|--------| | 2026-04-21 | Board meeting scheduled for Q1 2026 consolidated results. Q1 revenue data released in April showed steady foundry demand; UMC announced upcoming wafer price adjustments, triggering broad foundry sector rally (+8.6% for UMC on April 17–19). | Event data / 6-K, filed 2026-04-21 | | 2026-02-25 | UMC appointed Jason Wang as sole CEO, scrapping the co-president model. Cash dividend for 2025 approved. Capital investment in new chipmaking facility disclosed. Stock fell -6.0% on the leadership change announcement. | Event data / 6-K, filed 2026-02-25 | | 2026-01-28 | Q4 2025 earnings: mixed results — results beat on some metrics but guidance disappointed. Stock fell -15.0% on the day. | Event data, 2026-01-28 | | 2025-10-30 | Q3 2025 earnings: net income NT$10,870M (vs. NT$9,733M in Q3 2024, +11.7% YoY); gross margin 17.1%, operating margin 7.8%. Revenue NT$100,289M for Q3 2025 ATM business. Quarterly EPS NT$2.50. | 6-K Q3 2025, filed 2025-10-30 | | 2024-12-01 | UMC-Intel joint fab collaboration in Singapore (Fab 12i Phase 3) producing 12nm chips; Intel transferred its 12nm process technology to UMC. | 20-F FY2024, filed 2025-04-24 (Intel agreement reference) | | 2023-01-01 | Following the semiconductor industry downturn that began in early 2023, UMC experienced capacity utilization pressure and pricing compression across its 8-inch and 12-inch fab operations. | 20-F FY2024, filed 2025-04-24 |

Current state

Year-over-year changes (Q3 2025 vs. Q3 2024)

| Metric | Q3 2024 | Q3 2025 | Change | |--------|---------|---------|--------| | Net revenues (NT$M) | 86,285 (implied) | 100,289 | ▲~16.2% | | Gross margin (%) | 17.0 | 17.1 | ▲10 bps | | Operating margin (%) | 6.8 | 7.8 | ▲100 bps | | Net income attributable to shareholders (NT$M) | 9,733 | 10,870 | ▲11.7% |

Source: 6-K Q3 2025 earnings, filed 2025-10-30. Full-year FY2025 figures [DATA NEEDED] — 20-F FY2025 not yet available in summary data; the 6-K filed February 25, 2026 references "2025 consolidated financial statements" as an exhibit but the exhibit content was not captured in available summary data.

UMC reported Q3 2025 revenue of NT$100,289M in its ATM business (up 16.9% YoY, up 8.3% sequentially), with gross margin of 17.1% (up 10 bps from Q2 2025). Operating margin improved 100 bps to 7.8% from Q2's 6.8%. Net income attributable to shareholders of the parent was NT$10,870M (basic EPS NT$2.50, diluted EPS NT$2.41 per ADS US$0.168). Total shares outstanding including treasury were 4,436M as of Q3 2025 quarter-end. (6-K Q3 2025, filed 2025-10-30.)

Q4 2025 earnings (reported January 28, 2026) showed mixed results. The market reacted with a -15.0% sell-off on the day, which was the sharpest single-day decline in available data — suggesting guidance missed expectations significantly. Details of the Q4 specific figures are in the exhibit of the 6-K filed January 28, 2026 (Exhibit 99.1), which was not captured in available summary data. (Event data, 2026-01-28.)

A major leadership transition occurred in February 2026: UMC dismantled its co-president structure and appointed Jason Wang as sole CEO. The stock fell -6.0% on the announcement, likely reflecting investor concern about execution continuity. CFO Chitung Liu remained. (6-K, filed 2026-02-25.)

In April 2026, UMC announced upcoming wafer price adjustments — a pricing increase — which drove a sector-wide rally. UMC stock rose +8.6% and GlobalFoundries gained approximately 8% on the same news. The pricing power signal was interpreted as evidence of recovering demand across specialty foundry nodes. (Event data, 2026-04-19 to 2026-04-20.) Q1 2026 results were scheduled for a board meeting on April 21, 2026. (6-K, filed 2026-04-21.)

Key numbers

| Metric | FY2022 | FY2023 | FY2024 | FY2025 | |--------|--------|--------|--------|--------| | Revenue (NT$M) | [DATA NEEDED] | [DATA NEEDED] | [DATA NEEDED] | [DATA NEEDED] | | Gross margin (%) | [DATA NEEDED] | [DATA NEEDED] | [DATA NEEDED] | [DATA NEEDED] | | Operating margin (%) | [DATA NEEDED] | [DATA NEEDED] | [DATA NEEDED] | [DATA NEEDED] | | Net income attributable to shareholders (NT$M) | [DATA NEEDED] | [DATA NEEDED] | [DATA NEEDED] | [DATA NEEDED] |

Source: Full-year financials [DATA NEEDED] — requires complete 20-F FY2025 (not yet in available summary data) and full 20-F FY2024 financial tables. Q3 2025 quarterly data available from 6-K, filed 2025-10-30.

Recent news (last 6 months)

| Date | Headline | Source | Market reaction | |------|----------|--------|-----------------| | 2026-04-24 | United Microelectronics Q1 Preview: Not Very Exciting (Downgrade) | Seeking Alpha | -3.5% | | 2026-04-19–20 | UMC announces upcoming wafer price adjustments; Q1 sales show steady demand; stock surges | Multiple | +8.6% | | 2026-04-07 | UMC shares gap up sharply | MarketBeat | +6.4% | | 2026-04-02 | Price-driven analysis flagged | Stock Traders Daily | -3.7% | | 2026-02-25 | UMC appoints new CEO Jason Wang, scraps co-president model; 2025 cash dividend and capex plan disclosed | Multiple / 6-K | -6.0% | | 2026-01-30 | Q4 2025 earnings follow-on discussion | MarketBeat | -5.3% | | 2026-01-28 | Q4 2025 results: mixed results; initiates Q1 outlook; stock falls sharply | Multiple / 6-K | -15.0% |

Open questions

1. Q4 2025 and FY2025 full-year results: The Q4 2025 earnings press release (exhibit to 6-K, filed 2026-01-28) and the 2025 consolidated financial statements (exhibit to 6-K, filed 2026-02-25) contain the full annual financial data but were not available in the summary files. Full-year revenue, gross margin, operating margin, and net income for FY2025 are [DATA NEEDED]. Verify from SEC EDGAR full filing.

2. Wafer price hike magnitude: UMC announced "upcoming wafer price adjustments" in April 2026 (event data, 2026-04-19). The specific percentage increase, effective date, and node-specific pricing details were not disclosed in available data. How much margin uplift is embedded in Q2 2026, and does the increase apply to all customers or just new orders?

3. Intel-UMC Singapore collaboration economics: UMC's 20-F FY2024 references an agreement with Intel for 12nm production at Fab 12i Phase 3 in Singapore. Revenue contribution, capacity utilization, and economic terms of this arrangement have not been disclosed in available summary data. If Intel reduces its external foundry commitments as part of its own restructuring (multiple industry reports in 2025), the impact on UMC could be material. (20-F FY2024, filed 2025-04-24.)

4. CEO transition execution risk: Jason Wang replaced the co-president model in February 2026 — a structure that had been in place since 2021. The -6.0% stock reaction suggests investor skepticism. What is Wang's specific mandate (growth vs. cost discipline vs. new technology node investment), and does the leadership change alter UMC's long-term node strategy? Monitor in Q1 2026 earnings call.

5. Q1 2026 guidance from Q4 earnings call: The Q4 2025 earnings call (January 28, 2026) reportedly provided Q1 2026 outlook but the content is in the exhibit file not available in summary data. What was the Q1 guidance, and has UMC met it given the April 2026 strong sales data?

Red flags / things to verify

• -15% Q4 2025 earnings reaction: The stock fell 15.0% on January 28, 2026 after Q4 2025 results — the sharpest single-day decline in available data. The news was categorized as "mixed results; initiates Q1 outlook" (event data). A 15% single-day drop implies either a significant miss vs. consensus or forward guidance that was materially below expectations. Verify Q4 specifics from the full 6-K exhibit.

• CEO change and co-president model abandoned: Dismantling the co-president model creates single-point leadership risk. If Jason Wang's strategy diverges from the prior operating philosophy, integration of the leadership team may require time that affects execution. The market's -6.0% reaction indicates caution. (6-K, filed 2026-02-25.)

• Mature node cycle dependency: UMC focuses on 28nm and above. This segment saw severe oversupply in 2023–2024. A secondary wave of overcapacity remains a risk if Chinese domestic foundries (SMIC and others) accelerate capacity additions at legacy nodes, pressuring ASPs. The 20-F FY2024 explicitly calls out overcapacity as a major risk factor.

• 20-F FY2025 not yet in data: UMC filed its 20-F FY2025 on April 24, 2025 for FY2024 (prior year cycle). The FY2025 20-F filing would be due in April 2026 — but the available 20-F in data is FY2024 (filed 2025-04-24). No FY2025 annual 20-F was available in summary data, which means the most recent audited annual financials for UMC are FY2024. [DATA NEEDED — verify whether a FY2025 20-F has been filed.]

Sources

• 20-F (FY2024): Filed 2025-04-24 — https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=UMC&type=20-F&dateb=&owner=include&count=10
• 20-F (FY2023): Filed 2024-04-25 — SEC EDGAR
• 6-K (Q3 2025 earnings): Filed 2025-10-30 — SEC EDGAR
• 6-K (Q4 2025 earnings press release): Filed 2026-01-28, Exhibit 99.1 — SEC EDGAR (exhibit content not available in summary data)
• 6-K (CEO appointment and 2025 dividend): Filed 2026-02-25 — SEC EDGAR
• 6-K (2025 consolidated financial statements): Filed 2026-02-25, Exhibit 99.1 — SEC EDGAR (exhibit content not available in summary data)
• 6-K (Q1 2026 board meeting notice): Filed 2026-04-21 — SEC EDGAR