United Microelectronics Corporation (NEW) (UMC)
UMC moved a median of -0.13% 30 minutes after news, and -0.26% by the close. How UMC actually reacts to news — the realized, point-in-time move the market made, measured across 241 labeled events over the last three years with zero look-ahead.
UMC’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 45% | 241 |
| 30-min | -0.13% | 47% | 241 |
| 60-min | +0.21% | 54% | 241 |
| to close | -0.26% | 44% | 240 |
| Middle 50% of UMC reactions | -0.79% to +0.67% |
|---|---|
| Median reaction (30-min) | -0.13% |
| Measured reactions | 241 |
Half of all United Microelectronics Corporation (NEW) news events land between -0.79% and +0.67% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How UMC reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 24 | +0.07% | 58% | +0.51% |
| Analyst downgrades | 31 | -0.35% | 39% | -0.27% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. 3 further classes were observed with fewer than 10 measured events and are not published. See how UMC ranks against every other measured name →
That’s how UMC usually reacts — get an email when it moves on news →Email me when UMC moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to UMC's baseline. Nothing else.
Recent UMC events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 6-K UNITED MICROELECTRONICS For: Oct 13 | SEC filing · Form 6-K | SEC EDGAR | +0.18% | +2.00% | |
| Form 6-K UNITED MICROELECTRONICS For: Oct 06 | SEC filing · Form 6-K | SEC EDGAR | -0.28% | -1.49% | |
| UMC Reports Sales for September 2026 | Press release | Business Wire | -0.28% | -1.49% | |
| Form 6-K UNITED MICROELECTRONICS For: Oct 05 | SEC filing · Form 6-K | SEC EDGAR | -0.27% | +0.42% | |
| Form 6-K/A UNITED MICROELECTRONICS For: Oct 05 | SEC filing · Form 6-K | SEC EDGAR | +0.11% | +1.12% | |
| Form 6-K UNITED MICROELECTRONICS For: Sep 29 | SEC filing · Form 6-K | SEC EDGAR | -1.06% | +1.19% | |
| Form 6-K UNITED MICROELECTRONICS For: Sep 04 | SEC filing · Form 6-K | SEC EDGAR | +1.12% | +1.42% | |
| UMC Reports Sales for August 2026 | Press release | Business Wire | +1.12% | +1.42% | |
| Form 6-K UNITED MICROELECTRONICS For: Sep 02 | SEC filing · Form 6-K | SEC EDGAR | +1.95% | +2.20% | |
| Form 6-K UNITED MICROELECTRONICS For: Aug 26 | SEC filing · Form 6-K | SEC EDGAR | -1.05% | -2.21% | |
| Form 6-K UNITED MICROELECTRONICS For: Aug 14 | SEC filing · Form 6-K | SEC EDGAR | -0.05% | +1.11% | |
| Form 6-K UNITED MICROELECTRONICS For: Aug 06 | SEC filing · Form 6-K | SEC EDGAR | +0.37% | +2.13% | |
| UMC Reports Sales for July 2026 | Press release | Business Wire | +0.37% | +2.13% | |
| Form 6-K UNITED MICROELECTRONICS For: Aug 05 | SEC filing · Form 6-K | SEC EDGAR | -0.25% | -1.88% | |
| Form 6-K UNITED MICROELECTRONICS For: Jul 30 | SEC filing · Form 6-K | SEC EDGAR | +1.25% | +7.86% | |
| Form 6-K UNITED MICROELECTRONICS For: Jul 29 | SEC filing · Form 6-K | SEC EDGAR | +3.72% | +0.23% | |
| UMC Announces Fab Expansion in Singapore and Construction of New Fab in Tainan to Meet Accelerating AI Demand | Press release | Business Wire | +3.72% | +0.23% | |
| UMC Reports Second Quarter 2026 Results | Press release | Business Wire | +3.72% | +0.23% | |
| Form 6-K UNITED MICROELECTRONICS For: Jul 21 | SEC filing · Form 6-K | SEC EDGAR | -1.82% | -1.21% | |
| Form 6-K UNITED MICROELECTRONICS For: Jul 15 | SEC filing · Form 6-K | SEC EDGAR | -0.60% | -2.66% | |
| Form 6-K UNITED MICROELECTRONICS For: Jul 14 | SEC filing · Form 6-K | SEC EDGAR | +0.17% | -1.36% | |
| SILITH and UMC Achieve Mass Production Milestone for Silicon Photonics | Press release | Business Wire | +0.17% | -1.36% | |
| Form 6-K UNITED MICROELECTRONICS For: Jul 06 | SEC filing · Form 6-K | SEC EDGAR | +1.32% | +0.51% | |
| UMC Reports Sales for June 2026 | Press release | Business Wire | +1.32% | +0.51% | |
| Form 6-K UNITED MICROELECTRONICS For: Jun 29 | SEC filing · Form 6-K | SEC EDGAR | +0.66% | +4.44% | |
| Form 6-K UNITED MICROELECTRONICS For: Jun 23 | SEC filing · Form 6-K | SEC EDGAR | +1.50% | +1.08% | |
| Form 6-K UNITED MICROELECTRONICS For: Jun 22 | SEC filing · Form 6-K | SEC EDGAR | +2.25% | +1.14% | |
| Form 6-K UNITED MICROELECTRONICS For: Jun 18 | SEC filing · Form 6-K | SEC EDGAR | -0.89% | +2.47% | |
| Form 6-K UNITED MICROELECTRONICS For: Jun 16 | SEC filing · Form 6-K | SEC EDGAR | +0.58% | -2.92% | |
| Form 6-K UNITED MICROELECTRONICS For: Jun 05 | SEC filing · Form 6-K | SEC EDGAR | -0.58% | -4.14% | |
| UMC Reports Sales for May 2026 | Press release | Business Wire | -0.58% | -4.14% | |
| Form 6-K UNITED MICROELECTRONICS For: Jun 03 | SEC filing · Form 6-K | SEC EDGAR | -2.37% | -0.37% | |
| Form SD UNITED MICROELECTRONICS | SEC filing · Form SD | SEC EDGAR | -0.46% | -2.03% | |
| Form 6-K UNITED MICROELECTRONICS For: May 27 | SEC filing · Form 6-K | SEC EDGAR | -0.02% | -3.89% | |
| Form 6-K UNITED MICROELECTRONICS For: May 22 | SEC filing · Form 6-K | SEC EDGAR | +0.61% | +0.94% | |
| Form 6-K UNITED MICROELECTRONICS For: May 20 | SEC filing · Form 6-K | SEC EDGAR | -0.55% | +1.44% | |
| Form 6-K UNITED MICROELECTRONICS For: May 15 | SEC filing · Form 6-K | SEC EDGAR | +0.86% | +1.77% | |
| UMC Announces Release of 14nm eHV FinFET Platform, Advancing Innovation in Next-Generation Smartphone Displays | Press release | Business Wire | +1.68% | +2.27% | |
| Form 6-K UNITED MICROELECTRONICS For: May 13 | SEC filing · Form 6-K | SEC EDGAR | +1.42% | +0.44% | |
| Form 6-K UNITED MICROELECTRONICS For: May 12 | SEC filing · Form 6-K | SEC EDGAR | +1.16% | +0.38% | |
| Form 6-K UNITED MICROELECTRONICS For: May 11 | SEC filing · Form 6-K | SEC EDGAR | +1.80% | +0.13% | |
| Form 6-K UNITED MICROELECTRONICS For: May 08 | SEC filing · Form 6-K | SEC EDGAR | +0.79% | +5.47% | |
| UMC Reports Sales for April 2026 | Press release | Business Wire | +0.79% | +5.47% | |
| Form 6-K UNITED MICROELECTRONICS For: May 07 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | -0.53% | |
| Form 20-F UNITED MICROELECTRONICS For: Dec 31 | SEC filing · Form 20-F | SEC EDGAR | +1.40% | +4.56% | |
| Form 6-K UNITED MICROELECTRONICS For: Apr 30 | SEC filing · Form 6-K | SEC EDGAR | +1.40% | +4.56% | |
| UMC Files Form 20-F for 2025 with US Securities and Exchange Commission | Press release | Business Wire | +1.40% | +4.56% | |
| Form 6-K UNITED MICROELECTRONICS For: Apr 29 | SEC filing · Form 6-K | SEC EDGAR | +1.42% | +3.57% | |
| UMC Reports First Quarter 2026 Results | Press release | Business Wire | +1.42% | +3.57% | |
| Form 6-K UNITED MICROELECTRONICS For: Apr 21 | SEC filing · Form 6-K | SEC EDGAR | +2.02% | +1.90% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the UMC section they belong to.
Where else UMC is measured.
UMC earnings → · Analyst actions → · SEC filings →
Other Technology names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Xperi Inc. (XPER) | 242 | +0.20% | 57% |
| TrueCar, Inc. (TRUE) | 241 | -0.17% | 38% |
| Ascent Solar Technologies, Inc (ASTI) | 240 | -0.70% | 38% |
| CEVA, Inc. (CEVA) | 240 | -0.08% | 42% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
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How the numbers are made.
How is United Microelectronics Corporation (NEW)'s median reaction calculated?
Every labeled UMC news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 241 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 47% of UMC's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does UMC's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.