Who owns United Microelectronics (UMC)?
26 holders named in SEC filings declare between 5.8% and 6.8% of United Microelectronics' shares outstanding, as of Jun 30, 2026. The largest are BlackRock (1.3%), Chia-Tsung Hung (0.51%) and UBS (0.46%); the five largest hold 3.1% together. Another 341 institutions hold small positions worth 1.2%. At least 92.0% of the shares appear in no ownership filing: investors who do not have to report, mostly individuals. From Mar 31, 2026 to Jun 30, 2026, institutions that filed both quarters bought 1.7% and sold 1.5% of the shares, a net purchase of 0.22%; 79 opened a position, 124 added, 109 reduced and 35 sold out. Biggest buyers: Bank of America (+7.6M shares) and Goldman Sachs (+5.2M shares). Biggest sellers: AQR (-7.0M) and Two Sigma (-6.6M). Directors and officers, from their latest Form 4: Chia-Tsung Hung (0.51%), Jason Shi Wang (0.26%) and Ming-Chih Hsu (0.07%). Over time, 355 managers declared United Microelectronics in their 13F for Q2 2026, against 110 for Q4 2019: together at most 7.1% of the shares outstanding, against 5.2%.
| Holder | Filing | Share of capital | As of | Holding since (13F) |
|---|---|---|---|---|
| BlackRock | 13F | 1.3% | Jun 30, 2026 | Q4 2019 or earlier |
| Chia-Tsung Hung | Form 4 | 0.51% | Mar 18, 2026 | — |
| UBS | 13F | 0.46% | Jun 30, 2026 | Q4 2019 or earlier |
| Goldman Sachs | 13F | 0.44% | Jun 30, 2026 | Q4 2019 or earlier |
| Bank of America | 13F | 0.40% | Jun 30, 2026 | Q4 2019 or earlier |
| Vanguard | 13F | 0.34% | Jun 30, 2026 | Q4 2019 or earlier |
| Morgan Stanley | 13F | 0.33% | Jun 30, 2026 | Q4 2019 or earlier |
| AQR | 13F | 0.31% | Jun 30, 2026 | Q3 2024 |
| Rafferty Asset Management, LLC | 13F | 0.30% | Jun 30, 2026 | Q3 2021 |
| Jason Shi Wang | Form 4 | 0.26% | Mar 18, 2026 | — |
| ACADIAN ASSET MANAGEMENT LLC | 13F | 0.23% | Jun 30, 2026 | Q4 2019 or earlier |
| Man Group plc | 13F | 0.22% | Jun 30, 2026 | Q4 2024 |
| CITIGROUP INC | 13F | 0.22% | Jun 30, 2026 | Q4 2019 or earlier |
| Barclays | 13F | 0.19% | Jun 30, 2026 | Q1 2021 |
| State Street | 13F | 0.19% | Jun 30, 2026 | Q4 2019 or earlier |
| Neuberger Berman Group LLC | 13F | 0.16% | Jun 30, 2026 | Q2 2025 |
| Northern Trust | 13F | 0.16% | Jun 30, 2026 | Q4 2019 or earlier |
| JPMorgan | 13F | 0.15% | Jun 30, 2026 | Q2 2020 |
| Dimensional | 13F | 0.13% | Jun 30, 2026 | Q4 2019 or earlier |
| Two Sigma | 13F | 0.12% | Jun 30, 2026 | Q4 2019 or earlier |
| Creative Planning | 13F | 0.10% | Jun 30, 2026 | Q4 2020 |
| Tidal Investments LLC | 13F | 0.09% | Jun 30, 2026 | Q4 2023 |
| Empowered Funds, LLC | 13F | 0.08% | Jun 30, 2026 | Q2 2026 |
| Ming-Chih Hsu | Form 4 | 0.07% | Mar 18, 2026 | — |
| MATTHEWS INTERNATIONAL CAPITAL MANAGEMENT LLC | 13F | 0.06% | Jun 30, 2026 | Q1 2026 |
United Microelectronics institutional ownership over time
| Quarter | 13F managers | Share of the company (upper bound) | Value declared | Held by stock pickers |
|---|---|---|---|---|
| Q4 2019 | 110 | 5.2% | $325.3M | 67.5% |
| Q4 2020 | 180 | 3.6% | $754.4M | 63.6% |
| Q4 2021 | 252 | 4.5% | $1.3B | 47.2% |
| Q4 2022 | 214 | 5.3% | $873.5M | 54.3% |
| Q4 2023 | 244 | 4.9% | $1.0B | 41.7% |
| Q4 2024 | 248 | 6.4% | $1.0B | 49.4% |
| Q4 2025 | 265 | 6.0% | $1.2B | 46.3% |
| Q2 2026 | 355 | 7.1% | $4.9B | 45.4% |
From SEC Form 13F, every quarter since the end of 2019, read like the current quarter: entities of a house summed, a value contradicting its share count set aside. The share of the company is an upper bound — two managers can declare the same shares — over the shares outstanding at that date.