UMC United Microelectronics (UMC) Insider Trading, Ownership & Congress Trades
Semiconductors & Electronics · Semiconductors & related devices · CIK 0001033767
SEC filings
Insider buyers, 180 days
0
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
219
13F, latest reported quarter
What the filings say about UMC
Insiders, 180 days
-$526.4M net sold
3 sellers · 0% of sales under a 10b5-1 plan
United Microelectronics insider trades (Form 4)
Form 4 buys and sells (codes P and S). Grants, option exercises
and conversions excluded.
Over the last 180 days, UNITED MICROELECTRONICS CORP insiders sold a net $526.4M of stock across 5 Form 4 purchases and sales, with no insider buying. Source: SEC Form 4 filings, as of 2026-10-27.
Foreign private issuer: most of its insiders are exempt from SEC Form 4, but some still file it; those filings are listed below, and the record may be incomplete.
Insider
Filed
Shares
Value
Since filing
Context
- First Form 4 purchase or sale (code P or S) here by this insider on our record.
- The trade is 0.9% of the 1,172,140 shares held after it.
- 1 other insider sold within 30 days.
- 219 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Vice President LIN JEN-TSUNG sold about $1.6M of UMC on Sep 22, 2026; 1 other insider sold within 30 days and 219 funds added in the latest 13F quarter.Context
- 2 earlier Form 4 trades (code P or S) here by this insider (2 sales), the last on Sep 16, 2026.
- The trade is 15.2% of the 2,639,757 shares held after it.
- 1 other insider sold within 30 days.
- 219 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: CFO & SVP Liu Chitung sold about $58.0M of UMC on Sep 17, 2026; 1 other insider sold within 30 days and 219 funds added in the latest 13F quarter.Context
- 1 earlier Form 4 trade (code P or S) here by this insider (1 sale), the last on Jul 13, 2026.
- The trade is 39.5% of the 3,039,757 shares held after it.
- 1 other insider sold within 30 days.
- 219 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: CFO & SVP Liu Chitung sold about $170.8M of UMC on Sep 16, 2026; 1 other insider sold within 30 days and 219 funds added in the latest 13F quarter.Context
- First Form 4 purchase or sale (code P or S) here by this insider on our record.
- The trade is 57.2% of the 3,322,917 shares held after it.
- 1 other insider sold within 30 days.
- 219 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: CFO & SVP Liu Chitung sold about $294.3M of UMC on Jul 13, 2026, the largest insider sale at the company on our record; 1 other insider sold within 30 days and 219 funds added in the latest 13F quarter.Context
- First Form 4 purchase or sale (code P or S) here by this insider on our record.
- The trade is 0.3% of the 3,214,080 shares held after it.
- 1 other insider sold within 30 days.
- 219 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Vice President HU CHE-JEN sold about $1.7M of UMC on Jun 30, 2026, the largest insider sale at the company on our record; 1 other insider sold within 30 days and 219 funds added in the latest 13F quarter.5 transactions on record · a thin record, read with care
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
Seven facts, ranked against the sector ·
Rank is not a forecast
Insiders
net -$526.4M over 180 days
-$230.4M over 90 days
below 98% of Semiconductors & Electronics
Congress
no House purchase disclosed in the last 12 months
Funds
219 funds bought in last quarter
more than 63% of Semiconductors & Electronics
Revenue
no revenue reported in any filing
Margin
no margin: no revenue reported
Buybacks
no share repurchases reported
Short interest
1.3% of the float short (float per yahoo 2026-10-26) · 2.4 days to cover · settled 2026-09-30
below 89% of Semiconductors & Electronics
What changed in the last 30 days
Nothing new filed in the last 30 days
Watch UMC
A free account keeps a watchlist and can send one email a day when insiders, funds or Congress file on the names in it. No password and no card.
The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
+164.5%12M
Insider sell
Indexed to 100, dividend-adjusted, not a price chart.
When a name files heavily, the largest trades are drawn first.
Who owns UMC: institutional holders (13F)
13F holdings, latest reported quarter
31,544,454 sh
$858.3M
11,632,967 sh
$316.5M
11,109,785 sh
$302.3M
10,181,208 sh
$277.0M
8,601,967 sh
$234.1M
Congress trades in UMC
No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.
Activist and 5% holders (13D/13G)
No 5%+ ownership filings
Nobody has filed for crossing 5%. That is a fact, not missing data.
UMC planned insider sales (Form 144)
No planned-sale notices
No insider has filed to sell. Watch this after a run-up.
UMC mutual fund holders (N-PORT)
Funds ranked by the share of their own portfolio in this stock (N-PORT).
PROFUND VP ASIA 30
$2.2M position · as of 2026-06-30
9.7%
YieldMax(R) Semiconductor Portfolio Option Income ETF
$41.3M position · as of 2026-07-31
4.0%
YieldMax(R) Target 12(TM) Semiconductor Option Income ETF
$2.5M position · as of 2026-07-31
3.9%
PROFUND VP EMERGING MARKETS
$1.1M position · as of 2026-06-30
3.4%
Matthews Asia Innovators Fund
$13.3M position · as of 2026-06-30
2.6%
Golden Eagle Dynamic Hypergrowth ETF
$1.5M position · as of 2026-06-30
2.1%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M ·
% is the share of the fund's own portfolio
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
The complete filing record, in one place.
The record shows a net $526.4M sold by insiders over 180 days, 219 funds added last quarter. Each figure is a federal filing, dated the day it went public.
UMC financials
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
| 2024-12 | 2023-12 | 2022-12 | 2021-12 | |
|---|---|---|---|---|
| Gross profit | $75.7B | $77.7B | $125.8B | $72.0B |
| Net income | $48.7B | $60.1B | $90.3B | $50.6B |
SEC XBRL, fiscal years, as known on 2026-10-27
UMC Stock Sonar score 3/7 axes
Find similar shapesCompareUMC ranks highest on risk and compliance (80th percentile) and institutional and government (63rd), and lowest on insider conviction (1st), among Semiconductors & Electronics peers.
3 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored
UMC filings, in plain words
Are United Microelectronics insiders buying or selling UMC?
In the 180 days to 2026-10-27, United Microelectronics insiders were net sellers, a net $526.4M across purchases and sales reported on Form 4, by 3 sellers.
Read the full summary
In the 180 days to 2026-10-27, United Microelectronics insiders were net sellers of UMC, a net $526.4M across purchases and sales reported on Form 4 by 3 sellers. None of the 5 insider sales was flagged as made under a Rule 10b5-1 plan. Each figure is counted from SEC and House filings as of 2026-10-27, dated the day the filing was made public.
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