UNITED MICROELECTRONICS CORP (UMC) has 4 SEC Form 4 insider filings on record in the last 90 days. No insider purchases were filed — 3 sales totalling $524.8M. Most recent filing: Sept. 17, 2026.
| Date | Insider | Value | Shares | Stake | Pre-planned | Links |
|---|---|---|---|---|---|---|
| Sept. 17, 2026 filed Sept. 16, 2026 | Liu Chitung CFO & SVP | −$228,799,600 | 1,600,000 | −38% | No | |
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| Sept. 8, 2026 filed Sept. 7, 2026 | Liu Chitung CFO & SVP | $0 | 2,000,000 | 0% | No | |
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| July 13, 2026 | Liu Chitung CFO & SVP | −$294,291,000 | 1,900,000 | −36% | No | |
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| June 30, 2026 | HU CHE-JEN Vice President | −$1,713,000 | 10,000 | −0% | No | |
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Form 4 is the filing company officers, directors and 10% shareholders must submit to the SEC within two business days of trading their own company's stock. Open-market purchases generally carry more signal than sales, which are often scheduled in advance. More on how this works.
Real-time Telegram alerts the moment a Form 4 is filed. Filings shown here are delayed by 72 hours.
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