21.57 USD
↘ 0.04 (0.18%)AFTER HOURS (AS OF Tue 07:57 PM EDT)
UMC Stock After Hours
United Microelectronic Corp.
UMCNYSE • USD
Market: CLOSED
After-hours trading runs 4:00 PM – 8:00 PM ET.
UMC last traded at $21.57 after hours, down $0.04 (0.18%) from its regular-session close of $21.61.
📅 UMC is expected to report earnings around Oct 28, 2026 before the open (estimated), with an estimated EPS of $0.23. UMC earnings details →
UMC After Hours Chart
UMC After Hours 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 +8.1%, 68% have fully filled, median time to fill 5 trading days. Gap-downs averaged -6.7%, 82% have fully filled, median time to fill 4.5 trading days. Most recent: a +8.3% gap up on Aug 28, 2026, still unfilled. UMC has 2 unfilled gaps from the past 60 days; the largest is a +8.3% gap up on Aug 28, 2026, currently 76% retraced. Average 20-trading-day return after a UMC gap up: +13.51%. After a gap down: +9.64%.
Gap Ups25 events
Fill Rate
68.0%
Avg Gap
8.1%
Avg 50% Fill
2d
Avg Fill
5d
Gap Downs22 events
Fill Rate
81.8%
Avg Gap
6.7%
Avg 50% Fill
2d
Avg Fill
4.5d
Avg Gap Fill by Timeframes
Gap Ups
| 1 day | 1 week | 2 week | 4 week | |
|---|---|---|---|---|
| fills 25% | 56% | 84% | 88% | 88% |
| fills 50% | 28% | 68% | 76% | 80% |
| fills 75% | 16% | 52% | 60% | 64% |
| fills 100% | 4% | 44% | 48% | 52% |
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)
19 days ago
2026-08-28
Gap %
+8.29%
Gap From
$19.07
% vs Current
-11.75%
retraced 76% to $19.45
23 days ago
2026-08-24
Gap %
+6.32%
Gap From
$18.34
% vs Current
-15.13%
retraced 71% to $18.68
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 | ||||||
| 19 days ago | $19.07 | +8.29% | Open | 1d | — | 67% | 76% | 76% | 76% |
| 23 days ago | $18.34 | +6.32% | Open | 1d | — | 63% | 71% | 71% | 71% |
| 2026-08-04 | $18.69 | +5.83% | Filled | 2d | 4d | 17% | 100% | 100% | 100% |
| 2026-08-03 | $19.03 | -7.04% | Filled | 1d | 2d | 80% | 100% | 100% | 100% |
| 2026-07-28 | $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% | Filled | 1d | 38d | 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% |
Frequently Asked Questions
What is UMC's after-hours price?
United Microelectronic (UMC) is trading at $21.57 after hours, down $0.04 (0.18%) from its regular-session close of $21.61.
Why is UMC moving after hours?
UMC is down 0.18% in after-hours trading. Moves in this session almost always follow something released after the 4:00 PM ET close — an earnings report, guidance, a filing, or news — and trade on far thinner volume than the regular session, so the size of the move can overstate what the market will settle on at the next open.
When does UMC after-hours trading start and end?
After-hours trading in UMC on the NYSE runs from 4:00 PM to 8:00 PM ET on trading days, immediately after the regular session closes. Not every broker offers the full window, and liquidity thins sharply after about 6:30 PM ET.
Will UMC's after-hours move hold at the open?
An after-hours move that carries into the next session becomes an opening gap, and UMC's gap history is the best guide to what happens next: 68% of UMC gap-ups have fully filled, and 82% of gap-downs have filled over the past 5 years. Fill rates this high mean a large after-hours move is more often faded than extended.
When does UMC report earnings?
UMC is expected to report earnings around Oct 28, 2026 before the open (estimated), with an estimated EPS of $0.23. Earnings are the most common cause of a large after-hours move, since most companies report after the close.