18.71 USD
↘ 0.32 (1.67%)PRE MARKET (AS OF 08:08 AM EDT)
UMC Stock Premarket
United Microelectronic Corp.
UMCNYSE • USD
Market: OPEN
Premarket trading runs 4:00 AM – 9:30 AM ET.
UMC is trading at $18.71 in premarket, down $0.32 (1.67%) from its previous close of $19.03.
📅 UMC is expected to report earnings around Nov 4, 2026 before the open (estimated), with an estimated EPS of $0.18. UMC earnings details →
UMC Premarket Chart
UMC Premarket News
Gap Analytics — 5-year history, 5% minimum gap
Over the past 5 years, UMC has had 47 qualifying gap events (gaps of 5% or more at the open) — 25 gap-ups and 22 gap-downs. Gap-ups averaged +8%, 72% have fully filled, median time to fill 4.5 trading days. Gap-downs averaged -6.7%, 77% have fully filled, median time to fill 4 trading days. Most recent: a +6.3% gap up 3 days ago, still unfilled. UMC has 4 unfilled gaps from the past 60 days; the largest is a -8.8% gap down on Jul 16, 2026, currently 22% retraced. Average 20-trading-day return after a UMC gap up: +12.75%. After a gap down: +9.51%.
Gap Ups25 events
Fill Rate
72.0%
Avg Gap
8.0%
Avg 50% Fill
2.5d
Avg Fill
4.5d
Gap Downs22 events
Fill Rate
77.3%
Avg Gap
6.7%
Avg 50% Fill
2d
Avg Fill
4d
Avg Gap Fill by Timeframes
Gap Ups
| 1 day | 1 week | 2 week | 4 week | |
|---|---|---|---|---|
| fills 25% | 56% | 84% | 88% | 88% |
| fills 50% | 24% | 68% | 76% | 80% |
| fills 75% | 16% | 52% | 60% | 64% |
| fills 100% | 4% | 48% | 52% | 56% |
Gap Downs
| 1 day | 1 week | 2 week | 4 week | |
|---|---|---|---|---|
| fills 25% | 68% | 82% | 82% | 86% |
| fills 50% | 36% | 73% | 77% | 77% |
| fills 75% | 14% | 59% | 68% | 73% |
| fills 100% | 9% | 45% | 55% | 59% |
Active Unfilled Gaps (past 60 days)
3 days ago
2026-08-24
Gap %
+6.32%
Gap From
$18.34
% vs Current
-3.63%
retraced 63% to $18.77
41 days ago
2026-07-17
Gap %
-7.83%
Gap From
$22.29
% vs Current
+17.13%
retraced 68% to $21.74
42 days ago
2026-07-16
Gap %
-8.79%
Gap From
$24.92
% vs Current
+30.95%
retraced 22% to $23.20
51 days ago
2026-07-07
Gap %
-6.70%
Gap From
$25.83
% vs Current
+35.73%
retraced 98% to $25.80
Complete Gap History — 47 events
| Date | Gap From | Gap % | Status | Days to 50% | Days to Fill | % of Gap Filled After | |||
|---|---|---|---|---|---|---|---|---|---|
| 1 day | 1 week | 2 week | 4 week | ||||||
| 3 days ago | $18.34 | +6.32% | Open | 1d | — | 63% | 63% | 63% | 63% |
| 23 days ago | $18.69 | +5.83% | Filled | 2d | 4d | 17% | 100% | 100% | 100% |
| 24 days ago | $19.03 | -7.04% | Filled | 1d | 2d | 80% | 100% | 100% | 100% |
| 30 days ago | $19.08 | -11.43% | Filled | 2d | 4d | 37% | 100% | 100% | 100% |
| 2026-07-21 | $20.30 | +5.94% | Filled | 1d | 4d | 51% | 100% | 100% | 100% |
| 2026-07-17 | $22.29 | -7.83% | Open | 1d | — | 68% | 68% | 68% | 68% |
| 2026-07-16 | $24.92 | -8.79% | Open | — | — | 21% | 21% | 21% | 21% |
| 2026-07-15 | $23.84 | +7.38% | Filled | 1d | 2d | 79% | 100% | 100% | 100% |
| 2026-07-07 | $25.83 | -6.70% | Open | 2d | — | 21% | 80% | 98% | 98% |
| 2026-06-26 | $27.73 | -8.11% | Open | 2d | — | 27% | 80% | 80% | 80% |
| 2026-06-23 | $27.50 | -5.75% | Filled | 2d | 2d | 49% | 100% | 100% | 100% |
| 2026-06-22 | $24.08 | +11.71% | Filled | 5d | 11d | 4% | 74% | 100% | 100% |
| 2026-06-18 | $21.76 | +8.59% | Filled | 19d | 20d | 28% | 28% | 28% | 100% |
| 2026-06-11 | $18.90 | +5.08% | Filled | 30d | 31d | 2% | 2% | 2% | 2% |
| 2026-06-04 | $21.42 | -5.60% | Filled | 1d | 7d | 63% | 63% | 100% | 100% |
| 2026-06-03 | $22.46 | -6.01% | Filled | 9d | 9d | 29% | 29% | 100% | 100% |
| 2026-05-27 | $21.08 | +12.24% | Filled | 1d | 6d | 77% | 100% | 100% | 100% |
| 2026-05-26 | $18.22 | +15.42% | Filled | 11d | 44d | 19% | 19% | 83% | 83% |
| 2026-05-14 | $15.92 | +5.90% | Open | 1d | — | 91% | 91% | 91% | 91% |
| 2026-05-06 | $14.01 | +9.14% | Open | 3d | — | 46% | 67% | 67% | 67% |
| 2026-04-29 | $11.66 | +6.60% | Open | — | — | 43% | 43% | 43% | 43% |
| 2026-04-27 | $12.28 | -5.70% | Filled | 3d | 3d | 30% | 100% | 100% | 100% |
| 2026-04-23 | $12.71 | -5.82% | Filled | 5d | 5d | 18% | 100% | 100% | 100% |
| 2026-04-20 | $11.66 | +7.12% | Filled | 2d | 6d | 34% | 100% | 100% | 100% |
| 2026-04-17 | $10.62 | +11.58% | Open | — | — | 36% | 36% | 36% | 36% |
| 2026-04-16 | $9.95 | +5.23% | Open | — | — | 12% | 12% | 12% | 12% |
| 2026-04-02 | $8.97 | -7.58% | Filled | 1d | 3d | 58% | 100% | 100% | 100% |
| 2026-03-03 | $10.51 | -6.09% | Filled | 32d | 32d | 21% | 21% | 21% | 21% |
| 2026-01-29 | $11.38 | -5.89% | Filled | 55d | 55d | 12% | 12% | 12% | 49% |
| 2026-01-28 | $12.48 | -8.21% | Filled | 57d | 57d | 40% | 40% | 40% | 40% |
| 2026-01-27 | $11.33 | +10.50% | Filled | 2d | 2d | 25% | 100% | 100% | 100% |
| 2026-01-26 | $10.54 | +6.26% | Filled | 4d | 4d | 11% | 100% | 100% | 100% |
| 2026-01-23 | $10.90 | -5.50% | Filled | 2d | 2d | 43% | 100% | 100% | 100% |
| 2026-01-20 | $9.30 | +13.98% | Filled | 10d | 37d | 3% | 26% | 73% | 73% |
| 2026-01-16 | $8.77 | +5.59% | Filled | 43d | 50d | 22% | 22% | 22% | 22% |
| 2026-01-07 | $8.12 | +9.73% | Open | 2d | — | 16% | 56% | 56% | 56% |
| 2025-04-08 | $6.13 | +6.69% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2025-04-07 | $6.23 | -6.90% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2024-08-05 | $7.88 | -5.08% | Filled | 1d | 1d | 100% | 100% | 100% | 100% |
| 2024-07-31 | $7.43 | +6.33% | Filled | 4d | 4d | 23% | 100% | 100% | 100% |
| 2024-07-02 | $8.77 | -6.04% | Filled | 4d | 31d | 19% | 91% | 91% | 91% |
| 2022-11-15 | $7.22 | +5.68% | Filled | 2d | 2d | 45% | 100% | 100% | 100% |
| 2022-07-07 | $6.36 | +5.50% | Filled | 3d | 5d | 6% | 100% | 100% | 100% |
| 2022-06-30 | $6.95 | -5.04% | Filled | 1d | 14d | 63% | 71% | 71% | 100% |
| 2022-06-22 | $7.97 | -6.27% | Open | — | — | 20% | 20% | 20% | 20% |
| 2022-02-24 | $9.41 | -5.63% | Filled | 1d | 2d | 72% | 100% | 100% | 100% |
| 2021-09-03 | $11.75 | +5.70% | Filled | 3d | 3d | 31% | 100% | 100% | 100% |
Frequently Asked Questions
What is UMC's premarket price?
United Microelectronic (UMC) is trading at $18.71 in premarket, down $0.32 (1.67%) from the previous close of $19.03.
Why is UMC moving in premarket?
United Microelectronic (UMC) is down 1.67% from its previous close in premarket trading. Premarket moves are usually driven by company-specific news, earnings results, analyst rating or price-target changes, or broad market and sector sentiment. Check the latest UMC premarket headlines and gap history below for the likely catalyst.
When does UMC premarket trading start?
Premarket trading for UMC on the NYSE runs from 4:00 AM to 9:30 AM Eastern Time, ahead of the regular session (9:30 AM – 4:00 PM ET). After-hours runs from 4:00 PM to 8:00 PM ET.
How often does UMC fill its gaps?
Over the past 5 years, 72% of UMC gap-ups have fully filled and 77% of gap-downs have filled. Median time to fill is 5 trading days for gap-ups and 4 trading days for gap-downs.
Does UMC have any unfilled gaps?
Yes. UMC has 4 unfilled gaps from the past 60 days. The largest is a -8.8% gap down from Jul 16, 2026 and is currently 22% retraced.
What's the average return after a UMC gap?
Based on 47 qualifying gap events over the past 5 years, the average 20-trading-day return after a UMC gap up is +12.75%, and after a gap down is +9.51%.
When does UMC report earnings?
UMC is expected to report earnings around Nov 4, 2026 before the open (estimated), with an estimated EPS of $0.18.