NYSE · CIK 0001033767
UMC UNITED MICROELECTRONICS CORP
Insider trading from SEC Form 4. Last filing 21 d ago. Close $22.96 on Oct 9, 2026, +233% from the 52-week low and -17% from the high.
In brief
UNITED MICROELECTRONICS CORP (UMC) has 5 SEC Form 4 filings on file from 3 insiders, the latest filed on Sep 22, 2026. In the last 90 days insiders made 0 open-market buys worth $0 and 2 open-market sells worth $230M, net -$230M.
4 open-market trades have been scored at UMC. The newest: Jen-Tsung Lin (Vice President) sold $1.6M of stock on Sep 22, 2026, filed Sep 22, 2026, scored 48 (moderate). The largest of the 4 shown: Chitung Liu (CFO & SVP) sold $294M on Jul 13, 2026, scored 65 (notable). 2 insiders sold within 14 days of each other around Sep 22, 2026.
Last 90 days
Price and insider trades, last year
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
Open-market buys and sells at UNITED MICROELECTRONICS CORP, scored.
| Score | Insider | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 48Moderate | Jen-Tsung Lin Vice President sell | $1.6M 10,000 shares | -1% | - | |
| 65Notable | Chitung Liu CFO & SVP sell | $229M 1,600,000 shares | -38% | - | |
| 65Notable | Chitung Liu CFO & SVP sell | $294M 1,900,000 shares | -36% | +263% from low-15% from high | |
| 48Moderate | Che-Jen Hu Vice President sell | $1.7M 10,000 shares | -0% | +314% from low-3% from high |
Transactions
Every row filed, 7 in all.
| Date | Insider | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 22, 2026 | Jen-Tsung Lin Vice President | SOpen-market sale Commin Shares | -10,000 | $163.00 | $1.6M | 1,172,140 | 21 d ago |
| Sep 16, 2026 | Chitung Liu CFO & SVP | SOpen-market sale Common Shares | -1,200,000 | $142.33 | $171M | 3,039,757 | 26 d ago |
| Sep 17, 2026 | Chitung Liu CFO & SVP | SOpen-market sale Common Shares | -400,000 | $145.00 | $58M | 2,639,757 | 26 d ago |
| Sep 7, 2026 | Chitung Liu CFO & SVP | JOther Common Shares | +1,000,000 | $0.00 | $0 | 4,322,917 | 35 d ago |
| Sep 7, 2026 | Chitung Liu CFO & SVP | JOther Common Sharesindirect: By CTBC Bank Trust | -1,000,000 | $0.00 | $0 | 1,000,000 | 35 d ago |
| Jul 13, 2026 | Chitung Liu CFO & SVP | SOpen-market sale Common Shares | -1,900,000 | $154.89 | $294M | 3,322,917 | Jul 13, 2026 |
| Jun 30, 2026 | Che-Jen Hu Vice President | SOpen-market sale Common Shares | -10,000 | $171.30 | $1.7M | 3,214,080 | Jun 30, 2026 |
Insiders
Everyone who has filed a Form 4 here.
- Che-Jen HuVice President
- Jen-Tsung LinVice President
- Chitung LiuCFO & SVP
Questions about UMC
Answered from the filings on this page, as of the latest one.
Are insiders buying UMC?
As of Sep 22, 2026, SEC Form 4 filings show 0 open-market buys worth $0 by 0 insiders and 2 open-market sells worth $230M by 2 insiders at UNITED MICROELECTRONICS CORP in the last 90 days, net -$230M. Only purchases (code P) and sales (code S) count; grants, option exercises and tax withholding do not.
Who was the last insider to trade UMC on the open market?
Jen-Tsung Lin (Vice President) sold $1.6M of UMC on Sep 22, 2026 and filed the Form 4 on Sep 22, 2026. InsiderTell scored 48 (moderate), with 2 insiders on the same side within 14 days.
How many insiders file Form 4 at UNITED MICROELECTRONICS CORP?
3 people have filed a Form 4 at UNITED MICROELECTRONICS CORP, among them Che-Jen Hu (Vice President), Jen-Tsung Lin (Vice President), Chitung Liu (CFO & SVP). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.