UMC insider buying and SEC filings, explained
United Microelectronics Corp. · CIK 1033767
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$232.1M
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Sep 22, 2026 | Sale | Jen-Tsung Lin (Vice President) sold 10,000 shares at $163.00 ($1.6M). Holdings down 1% to 1,172,140 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 22, 2026 |
| Sep 16–17, 2026 | Sale | Chitung Liu (CFO) sold 1,600,000 shares between Sep 16 and Sep 17 at about $143.00 ($228.8M). Holdings down 38% to 2,639,757 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 17, 2026 |
| Jun 30, 2026 | Sale | Che-Jen Hu (Vice President) sold 10,000 shares at $171.30 ($1.7M). Holdings down <1% to 3,214,080 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jun 30, 2026 |
1 routine transaction (such as a grant, option exercise or tax withholding) is not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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