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United Microelectronics Corp (NYSE:UMC)
Taiwan · Delayed Price · Currency is USD
Technology · Semiconductors
19.25+0.36 (+1.93%)
Market cap
$48.3B
Website
Insider Score
––Not scored
UMC Insider Score
Insiders filed in the last 90 days, but none of those trades qualified for scoring — round-trip buys and filings whose price is far off the market are excluded.
UMC Stock Insider Trading Activity
UMC stock’s insider trading shows 5 sales on the open market for an estimated $526.43M by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days0 qualifying buys0 insiders$0 bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| LIN JEN-TSUNG Other | Sell | 10,000 | $163.00 | $1.63M | 0.8% | 1,172,140 | Sep 22, 2026 | — | Form 4 |
| Liu Chitung CFO | Sell | 400,000 | $145.00 | $58.00M | 13.2% | 2,639,757 | Sep 17, 2026 | — | Form 4 |
| Liu Chitung CFO | Sell | 1,200,000 | $142.33 | $170.80M | 28.3% | 3,039,757 | Sep 16, 2026 | — | Form 4 |
| Liu Chitung CFO | Other | 1,000,000 | — | — | 30.1% | 4,322,917 | Sep 7, 2026 | — | Form 4 |
| Liu Chitung CFO | Other | 1,000,000 | — | — | 50.0% | 1,000,000 | Sep 7, 2026 | — | Form 4 |
| Liu Chitung CFO | Sell | 1,900,000 | $154.89 | $294.29M | 36.4% | 3,322,917 | Jul 13, 2026 | — | Form 4 |
| HU CHE-JEN Other | Sell | 10,000 | $171.30 | $1.71M | 0.3% | 3,214,080 | Jun 30, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Sell (S) — Open-market or private sale
- Other (J) — Other acquisition or disposition — the filing explains it in a footnote
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.