Insider activity at United Microelectronics Corp has been all selling for a year now: about $526.4 million from three sellers, and zero buyers in open-market trades.
Keep in mind most insider selling is routine — stock-based pay has to be converted to cash at some point.
Big money check: 361 institutions held UMC as of Q2 2026, and more funds bought than sold. 2 quarters in a row of net selling by insiders. Insiders bought in 0 of the last 7 full quarters.
| Filed | Insider | Role | Type | Shares | Price | Value | Source |
|---|---|---|---|---|---|---|---|
| Sep 22, 2026 | LIN JEN-TSUNG | President | Sell | 10,000 | $163.00 | $1.6M | SEC |
| Sep 17, 2026 | Liu Chitung | CFO | Sell | 400,000 | $145.00 | $58.0M | SEC |
| Sep 17, 2026 | Liu Chitung | CFO | Sell | 1,200,000 | $142.33 | $170.8M | SEC |
| Jul 13, 2026 | Liu Chitung | CFO | Sell | 1,900,000 | $154.89 | $294.3M | SEC |
| Jun 30, 2026 | HU CHE-JEN | President | Sell | 10,000 | $171.30 | $1.7M | SEC |
In the last 12 months United Microelectronics Corp insiders made open-market purchases worth about $0 and sales worth about $526.4 million. Data comes from SEC Form 4 filings, updated every 30 minutes on CapitalSnitch.
The most recent open-market insider trade in UMC was filed on 2026-09-22.
361 investment managers reported holding UMC in SEC Form 13F filings for Q2 2026.
No congressional trades in UMC were reported in the past two years. The full list is free on CapitalSnitch.
Public-record data for research and education, not investment advice. Insider sales are often pre-planned (10b5-1). Congress data: Data derived from public disclosures filed under the Ethics in Government Act and the STOCK Act, republished free for public transparency and news reporting. Disclosures may lag the trade by 45 days or more and show amounts only as ranges. This data may not be used for credit rating, loan underwriting, solicitation of money (political, charitable or other), direct-mail or commercial targeting (5 U.S.C. 13107).