UMC insider trading — United Microelectronics Corp
Over the last 90 days, insiders at United Microelectronics Corp (UMC) made 0 open-market purchases worth $0 and 3 open-market sales worth $230.43M, making them net sellers by $230.43M. The largest sale was by Liu Chitung (CFO & SVP), who sold 1,200,000 shares for $170.80M on Sep 16, 2026.
Updated Oct 16, 2026.
Recent UMC insider transactions
Every Form 4 filed by United Microelectronics Corp officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Sep 22, 2026 | Lin Jen-Tsung | Vice President | S · Sale | Direct | 10,000 | $163.00 | $1.63M | Form 4 |
| Sep 17, 2026 | Liu Chitung | CFO & SVP | S · Sale | Direct | 400,000 | $145.00 | $58.00M | Form 4 |
| Sep 16, 2026 | Liu Chitung | CFO & SVP | S · Sale | Direct | 1,200,000 | $142.33 | $170.80M | Form 4 |
| Sep 7, 2026 | Liu Chitung | CFO & SVP | J · Other | Direct | 1,000,000 | — | — | Form 4 |
| Sep 7, 2026 | Liu Chitung | CFO & SVP | J · Other | Indirect | 1,000,000 | — | — | Form 4 |
UMC insider trading FAQ
Are insiders buying UMC stock?
Not on the open market. In the last 90 days, United Microelectronics Corp insiders made no open-market purchases, and 3 open-market sales totaling $230.43M. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading UMC?
Recent sellers: Lin Jen-Tsung, Liu Chitung.
Where does UMC insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.