United Microelectronics Corporation (NEW) UMC
Open calendar →United Microelectronics Corporation (NEW) Common Stock · Company · NYSE
Paper trade (simulated — no real money)
Fill: USD 18.8900 · FX 1 USD = 1.277900 SGD · about SGD 24.1395 per unitSign in to place simulated trades. USD fills are converted into the SGD portfolio at the displayed rate.
USD closing-price chart (daily close from yfinance · Last year)
USD 7.52 → 18.89 · 151.2%
Numbered dotted lines mark the filtered filings under Announcement Events below.
Price & SEC Filing History 23 Oct 2025 — 24 Oct 2026 (Last year)
Daily NYSE prices are sourced from yfinance. Yellow highlighting marks an intraday rise or a gap up between adjacent trading sessions. SEC acceptance times are converted to US Eastern time: pre-market filings appear below that day’s OHLCV row; filings accepted after the 09:30 ET open appear above it. The SEC does not publish an exact first-public-availability timestamp, so acceptance time is the best available proxy.
Date
Open
High
Low
Close
Volume
Weekend
18.6600
19.0000
18.5250
18.8900
7,155,610
65 · 6-K
Pre-market · 06:00 ET
6-K ↗
19.0700
19.1700
18.3100
18.5300
17,605,100
19.9000
19.9800
19.6300
19.8200
8,292,500
19.5000
19.9800
19.3500
19.6700
9,300,100
20.5500
20.6000
19.9700
20.0800
8,357,700
Weekend
Weekend
20.6500
20.6500
19.7400
19.8200
12,914,800
20.4800
20.9700
20.2500
20.9200
14,480,100
21.8500
22.0500
21.3400
21.4000
12,797,800
64 · 6-K
After market open · 10:01 ET
6-K ↗
21.9500
22.4000
21.8000
22.3900
8,712,300
22.7400
22.7400
22.3100
22.5500
7,051,800
Weekend
Weekend
23.1900
23.2800
22.8400
22.9600
5,243,500
23.1400
23.3200
22.5100
22.8200
11,899,400
22.9100
23.3400
22.8500
23.3100
8,054,900
63 · 6-K
After market open · 10:02 ET
6-K ↗
23.5400
23.6700
23.0500
23.1900
15,045,500
62 · 6-K/A
After market open · 13:48 ET
6-K/A ↗
61 · 6-K
After market open · 13:27 ET
6-K ↗
23.8200
24.1500
23.2600
23.9200
31,819,900
Weekend
Weekend
25.6700
26.3700
25.5200
26.2700
10,197,500
24.8500
25.3400
24.6700
25.2100
7,741,200
24.4500
24.6900
24.3500
24.4900
7,092,400
60 · 6-K
After market open · 10:03 ET
6-K ↗
24.4300
25.0200
24.1100
24.7200
10,906,400
24.0800
24.2100
23.4200
23.8500
7,090,800
Weekend
Weekend
24.2500
24.5400
24.1200
24.3100
6,334,400
24.1100
24.3500
23.8000
24.1000
6,672,600
25.2800
25.3800
24.4100
24.6800
10,892,400
25.2600
25.8000
25.1300
25.7700
8,421,800
24.9300
25.6300
24.6400
25.4300
11,256,800
Weekend
Weekend
24.4500
24.7100
23.8800
24.6100
30,092,000
23.5100
24.5500
23.3000
24.4700
17,755,200
22.4900
22.8400
22.2500
22.5300
11,217,700
21.8900
22.0600
21.5900
21.6100
8,815,700
22.0800
22.2600
21.8100
21.9000
16,298,200
Weekend
Weekend
22.4100
22.7200
22.3200
22.6400
7,185,200
21.9400
22.2800
21.8400
22.1200
10,127,200
22.0200
22.7000
21.9300
22.6900
11,197,600
21.5800
22.2000
21.5800
21.8200
11,535,100
No trading
Weekend
Weekend
20.4800
21.0300
20.3300
20.7700
10,010,900
59 · 6-K
Pre-market · 06:03 ET
6-K ↗
19.5700
19.9500
19.4500
19.8600
6,066,200
19.5400
20.1400
19.4900
19.9700
8,754,600
58 · 6-K
Pre-market · 06:03 ET
6-K ↗
20.4300
20.8400
20.1900
20.4700
17,944,200
20.0000
20.3100
19.7400
19.8800
8,836,500
Weekend
Weekend
20.6500
20.7800
19.5900
19.7900
19,843,100
18.8000
19.0800
18.6800
19.0700
9,119,600
19.4100
19.4600
18.8400
19.0300
6,789,300
57 · 6-K
Pre-market · 06:20 ET
6-K ↗
19.5000
20.0000
19.4200
19.6000
10,102,900
19.5000
19.5000
18.7700
19.0500
14,923,000
Weekend
Weekend
18.4500
18.6100
18.2800
18.3400
7,302,200
18.0300
18.2400
17.8800
18.0000
10,509,300
18.8000
18.9700
17.9700
18.1200
12,432,500
18.5600
18.7600
18.1400
18.4800
17,417,100
19.3800
19.7700
19.2700
19.5300
7,972,800
Weekend
Weekend
18.9400
19.1700
18.7500
19.1500
7,176,700
56 · 6-K
Pre-market · 06:02 ET
6-K ↗
19.2500
19.7200
19.2300
19.3800
7,682,300
19.6700
19.6700
19.3000
19.3100
10,598,500
19.3500
19.4500
18.9100
18.9400
7,547,500
19.2700
19.3500
18.7700
18.7900
9,610,900
Weekend
Weekend
18.5900
18.8200
18.1800
18.7200
13,371,500
18.9000
19.5700
18.7300
19.2000
11,956,800
55 · 6-K
Pre-market · 06:02 ET
6-K ↗
19.6600
19.9500
19.2000
19.2900
15,095,900
54 · 6-K
Pre-market · 06:01 ET
6-K ↗
19.7800
20.8500
19.5900
20.6300
20,080,600
17.6900
18.7600
17.4900
18.6900
12,063,300
Weekend
Weekend
19.7800
20.0800
18.8200
19.0300
16,738,100
17.5300
19.0200
17.5300
18.9400
24,763,000
53 · 6-K
Pre-market · 06:01 ET
6-K ↗
17.0500
18.1300
16.9600
17.1100
24,695,100
52 · 6-K
Pre-market · 06:15 ET
6-K ↗
51 · 6-K
Pre-market · 06:13 ET
6-K ↗
16.9000
17.7000
16.5400
17.3600
26,577,200
20.0300
20.1500
18.5700
19.0800
15,477,300
Weekend
Weekend
19.8400
20.0800
18.9700
19.4800
16,398,900
20.7200
21.1100
20.4400
20.8700
9,189,500
21.0000
21.6000
20.9900
21.2900
7,356,200
21.5100
21.5100
20.8900
21.1900
17,368,100
50 · 6-K
Pre-market · 06:03 ET
6-K ↗
20.6900
21.2300
20.2700
20.3000
15,356,000
Weekend
Weekend
20.5500
21.7400
20.1600
21.2500
20,772,500
22.7300
23.2000
22.0600
22.2900
20,901,600
25.6000
25.8000
24.2100
24.9200
15,708,500
49 · 6-K
Pre-market · 06:01 ET
6-K ↗
24.1700
24.4000
23.5700
23.8400
13,175,600
48 · 6-K
Pre-market · 06:15 ET
6-K ↗
23.5600
23.7300
23.0100
23.4600
21,656,800
Weekend
Weekend
24.3900
24.6300
23.7700
24.3400
6,715,400
25.0200
25.4900
24.6500
24.8600
11,973,500
24.4100
25.0400
24.0400
24.7300
17,212,400
24.1000
24.4700
23.3400
23.8300
24,568,000
25.7000
26.7800
25.5900
25.8300
13,180,600
47 · 6-K
Pre-market · 06:01 ET
6-K ↗
Weekend
Weekend
No trading
26.0600
26.2900
24.1500
24.5400
21,004,300
26.3900
26.6600
25.6800
25.7100
19,750,300
26.3300
27.2700
26.1400
27.2100
14,475,700
25.7000
26.8600
24.8200
26.8400
11,871,400
46 · 6-K
Pre-market · 06:02 ET
6-K ↗
Weekend
Weekend
25.4800
26.0900
24.8700
25.5800
19,297,900
28.2400
28.9600
27.3400
27.7300
20,939,800
26.4000
28.6600
26.4000
28.0100
24,354,600
25.9200
26.7000
25.8800
26.2000
25,943,500
45 · 6-K
Pre-market · 06:02 ET
6-K ↗
26.9000
28.2800
26.8000
27.5000
26,322,100
44 · 6-K
Pre-market · 06:03 ET
6-K ↗
Weekend
Weekend
No trading
23.6300
24.1700
23.1000
24.0800
26,913,600
43 · 6-K
Pre-market · 06:01 ET
6-K ↗
22.2700
22.5300
21.7500
21.7600
13,622,500
22.4600
22.6800
21.5900
21.6200
16,464,400
42 · 6-K
Pre-market · 06:02 ET
6-K ↗
22.5500
23.3600
22.3800
23.0800
15,920,000
Weekend
Weekend
20.8000
21.7800
20.6100
21.6300
16,400,400
19.8600
20.8500
19.8400
20.6800
20,628,700
19.0300
19.7100
18.8000
18.9000
20,239,000
20.4900
20.8000
18.7000
19.8800
23,741,800
20.2900
20.5800
19.6500
20.0000
16,800,800
Weekend
Weekend
20.5500
20.7000
19.6400
19.7000
32,089,700
41 · 6-K
Pre-market · 06:02 ET
6-K ↗
20.2200
20.9800
19.9100
20.7900
17,539,700
21.1100
21.5000
20.5800
21.4200
16,532,100
40 · 6-K
Pre-market · 06:02 ET
6-K ↗
22.3400
22.5100
21.8700
22.4600
15,033,100
22.9700
23.0200
22.1400
22.8900
11,503,000
Weekend
Weekend
22.6400
22.8400
21.9900
22.1800
14,650,500
22.3800
23.2000
21.7600
22.6800
16,065,900
23.6600
23.6900
21.6800
22.2200
27,433,600
39 · 6-K
Pre-market · 06:01 ET
6-K ↗
21.0300
21.5200
20.5000
21.0800
26,752,000
No trading
Weekend
Weekend
18.0800
18.3000
17.9800
18.2200
10,041,700
38 · 6-K
Pre-market · 06:02 ET
6-K ↗
18.1200
18.4500
18.0100
18.3500
12,137,400
17.3100
17.6100
17.1200
17.5600
13,552,700
37 · 6-K
Pre-market · 06:01 ET
6-K ↗
17.4200
18.1000
17.3000
17.5800
19,734,400
17.6000
17.7500
16.8800
17.1200
20,562,800
Weekend
Weekend
16.9000
17.4300
16.8400
17.2000
15,989,800
36 · 6-K
Pre-market · 06:00 ET
6-K ↗
16.8600
17.3200
16.0000
17.1300
17,559,800
15.5800
16.1400
15.5700
15.9200
11,526,700
35 · 6-K
Pre-market · 06:29 ET
6-K ↗
16.1700
16.3000
15.5000
16.0600
19,760,200
34 · 6-K
Pre-market · 06:12 ET
6-K ↗
15.6500
15.9000
15.3900
15.5900
13,858,600
33 · 6-K
Pre-market · 06:01 ET
6-K ↗
Weekend
Weekend
14.5200
15.4500
14.4300
15.4200
14,785,200
32 · 6-K
Pre-market · 06:01 ET
6-K ↗
15.2400
15.4500
15.0200
15.1600
16,029,100
31 · 6-K
Pre-market · 06:00 ET
6-K ↗
15.2900
15.4500
14.7000
15.2300
30,100,100
13.5000
14.2200
13.4200
14.0100
23,357,500
13.1700
13.3700
12.8900
12.9800
9,248,300
Weekend
Weekend
13.0300
13.2000
12.9600
13.0500
8,407,600
12.4500
13.1300
12.4500
13.0600
15,475,600
30 · 6-K
Pre-market · 06:10 ET
6-K ↗
29 · 20-F
Pre-market · 06:04 ET
FORM 20-F ↗
12.4300
13.3900
12.1000
12.7500
25,368,600
28 · 6-K
Pre-market · 06:06 ET
6-K ↗
27 · 6-K
Pre-market · 06:04 ET
6-K ↗
11.6900
11.8900
11.5700
11.6600
12,220,800
11.5800
11.7900
11.4600
11.6900
12,884,400
Weekend
Weekend
12.1800
12.3200
12.1200
12.2800
10,979,200
11.9700
12.1000
11.8200
12.0000
10,655,400
12.6300
12.8200
12.5800
12.7100
10,053,700
12.1800
12.4400
12.0500
12.3300
13,172,400
26 · 6-K
Pre-market · 06:03 ET
6-K ↗
12.4900
12.7400
12.2100
12.6400
22,647,200
Weekend
Weekend
11.8500
11.8600
11.4100
11.6600
20,922,400
10.4700
10.7400
10.4100
10.6200
11,609,100
9.9100
9.9600
9.8000
9.9500
7,029,300
25 · 6-K
Pre-market · 06:01 ET
6-K ↗
9.6900
9.7000
9.5200
9.5900
5,458,400
9.5300
9.7200
9.4600
9.7000
7,030,900
Weekend
Weekend
9.8100
9.8500
9.7000
9.7400
6,704,800
9.3700
9.5400
9.3700
9.5300
7,807,500
9.4600
9.6100
9.3800
9.4700
12,162,400
24 · 6-K
Pre-market · 06:04 ET
6-K ↗
9.0900
9.3100
8.9800
9.3100
16,941,400
8.7000
8.7500
8.6500
8.6900
5,440,200
Weekend
Weekend
No trading
8.2900
8.6900
8.2900
8.6700
7,663,000
9.0100
9.1100
8.9500
8.9700
7,814,200
8.9200
9.0400
8.7500
8.9800
10,412,400
8.9100
8.9700
8.5900
8.6100
12,277,700
Weekend
Weekend
9.0200
9.0500
8.8700
8.8700
8,178,000
9.1300
9.1400
8.8900
9.0200
8,802,000
23 · 6-K
Pre-market · 06:07 ET
6-K ↗
9.3900
9.4000
9.2600
9.3100
6,822,500
8.9800
9.0800
8.9000
9.0500
8,451,800
9.1100
9.2600
9.0600
9.0900
7,752,400
Weekend
Weekend
9.0600
9.1400
8.9800
9.1200
11,090,300
9.0000
9.3100
8.9900
9.2600
6,562,900
9.5300
9.5300
9.2900
9.3000
8,057,300
9.4900
9.5700
9.4600
9.5200
4,438,500
9.5000
9.5800
9.4600
9.4700
5,426,200
Weekend
Weekend
9.4400
9.5100
9.2300
9.2700
5,228,100
9.5000
9.5200
9.2800
9.3500
9,027,700
22 · 6-K
Pre-market · 06:38 ET
6-K ↗
9.7300
9.9000
9.7000
9.7000
5,921,900
9.6100
9.6600
9.4600
9.4800
8,597,400
9.3900
9.7500
9.3600
9.7300
14,962,600
Weekend
Weekend
9.6900
9.7900
9.5500
9.6000
9,251,000
9.8500
9.9800
9.5500
9.7500
7,232,100
21 · 6-K
Pre-market · 06:00 ET
6-K ↗
9.9000
9.9600
9.7700
9.8800
7,144,200
9.8700
10.0100
9.8100
9.9000
13,527,400
10.2700
10.5300
10.2600
10.5100
4,965,300
Weekend
Weekend
10.2600
10.4600
10.1800
10.4400
4,661,600
10.6200
10.6200
10.1800
10.3000
8,986,300
10.5000
10.6400
10.4300
10.5500
6,630,800
20 · 6-K
Pre-market · 06:03 ET
6-K ↗
19 · 6-K
Pre-market · 06:00 ET
6-K ↗
10.9300
11.0400
10.8900
10.9200
6,955,100
18 · 6-K
Pre-market · 06:03 ET
6-K ↗
10.4000
10.5300
10.3300
10.4200
6,005,600
Weekend
Weekend
10.1300
10.4700
10.1300
10.4000
8,402,000
10.2300
10.2400
10.0700
10.1300
3,988,100
10.2500
10.3700
10.1900
10.2300
6,501,100
10.2700
10.3300
10.1500
10.2700
6,634,300
No trading
Weekend
Weekend
10.2800
10.4900
10.2800
10.4200
8,147,100
17 · 6-K
Pre-market · 06:02 ET
6-K ↗
10.4400
10.4400
10.1800
10.2900
9,376,700
10.1100
10.3500
10.0400
10.3000
9,197,400
10.0000
10.0700
9.9000
9.9100
7,082,300
10.0000
10.1700
9.9300
10.0500
8,127,200
Weekend
Weekend
10.0600
10.2000
9.9900
10.0600
14,596,500
9.7500
10.0300
9.7100
9.9700
11,102,100
16 · 6-K
Pre-market · 06:10 ET
6-K ↗
10.0200
10.1200
9.7800
9.9500
14,215,500
9.8100
9.8900
9.6500
9.8500
13,435,300
9.7700
10.1000
9.6900
10.0400
10,523,000
Weekend
Weekend
10.1500
10.4500
10.0700
10.1800
17,812,700
10.7100
10.7900
10.3700
10.5800
14,392,700
11.4600
11.8600
11.2300
11.3800
25,816,700
15 · 6-K
Pre-market · 06:00 ET
6-K ↗
12.5200
12.6800
12.2200
12.4800
26,912,600
11.2000
11.4200
11.1300
11.3300
19,391,700
Weekend
Weekend
10.3000
10.5600
10.2600
10.5400
12,720,200
10.8300
10.9400
10.7800
10.9000
8,575,400
10.8500
11.2000
10.8500
11.1300
19,442,600
10.6000
10.9300
10.5600
10.7800
24,441,200
No trading
Weekend
Weekend
9.2600
9.3700
9.1500
9.3000
14,269,600
8.8700
8.9400
8.7600
8.7700
10,913,300
8.5800
8.8000
8.5200
8.7900
10,693,100
14 · 6-K
Pre-market · 06:07 ET
6-K ↗
8.8000
8.8200
8.6400
8.6600
7,590,500
8.7600
8.8900
8.7600
8.8500
6,418,500
Weekend
Weekend
8.8100
8.8600
8.6600
8.7900
11,347,200
8.5600
8.7200
8.4700
8.5500
11,429,800
8.9100
9.1100
8.7800
8.9300
21,011,100
13 · 6-K
Pre-market · 06:05 ET
6-K ↗
7.8500
8.1500
7.8400
8.1200
16,423,400
7.7900
7.8100
7.7000
7.7700
10,479,800
Weekend
Weekend
7.8500
7.9000
7.7600
7.8400
11,607,400
No trading
7.9200
7.9600
7.8400
7.8600
3,867,900
7.9800
8.0000
7.9400
7.9600
2,979,600
12 · 6-K
Pre-market · 06:06 ET
6-K ↗
7.9200
7.9700
7.9000
7.9700
3,628,400
Weekend
Weekend
7.9900
8.0600
7.9900
8.0200
3,973,000
No trading
7.9700
8.0200
7.9400
8.0000
5,510,500
8.0400
8.0500
7.9200
7.9700
5,376,400
8.1200
8.1500
8.0900
8.1300
4,570,100
Weekend
Weekend
8.0900
8.1700
8.0900
8.1000
13,175,200
8.0500
8.1200
8.0100
8.0700
9,020,600
8.0800
8.1600
7.9800
8.0000
10,217,400
11 · 6-K
Pre-market · 06:08 ET
6-K ↗
7.9000
7.9400
7.8400
7.8900
8,830,700
7.9200
7.9500
7.8300
7.8400
6,915,500
Weekend
Weekend
7.8800
7.8900
7.8000
7.8700
15,394,700
7.9100
7.9100
7.7800
7.8900
8,398,500
7.9700
8.0500
7.9500
8.0000
9,227,900
10 · 6-K
Pre-market · 06:04 ET
6-K ↗
8.0200
8.1000
7.9700
8.0900
8,896,800
8.0200
8.0800
7.9800
8.0500
8,420,900
Weekend
Weekend
7.9000
8.0600
7.8800
8.0200
10,655,200
7.7800
7.9400
7.7800
7.8700
9,468,300
9 · 6-K
Pre-market · 06:16 ET
6-K ↗
7.6700
7.8700
7.6600
7.8500
9,272,900
7.5500
7.8000
7.5500
7.7800
9,487,100
7.4900
7.6000
7.4800
7.5300
6,626,300
Weekend
Weekend
7.3500
7.4700
7.3300
7.4600
5,488,800
8 · 6-K
Pre-market · 06:33 ET
6-K ↗
No trading
7.3100
7.4300
7.2800
7.3300
8,087,500
7.2500
7.2800
7.1500
7.2700
6,022,200
7.3300
7.4500
7.3300
7.4400
9,730,000
Weekend
Weekend
7.1900
7.3100
7.1100
7.2400
11,543,100
7.2600
7.2700
7.0500
7.1200
12,394,800
7 · 6-K
Pre-market · 06:00 ET
6-K ↗
7.0900
7.2600
7.0800
7.2300
8,212,500
6.9900
7.1200
6.9900
7.0600
7,756,900
7.0800
7.1100
6.9700
7.0200
5,327,600
Weekend
Weekend
7.0900
7.2400
7.0700
7.1400
5,889,800
7.2200
7.2300
7.0700
7.1100
8,149,400
7.2500
7.3300
7.1600
7.2400
7,060,000
6 · 6-K
Pre-market · 06:36 ET
6-K ↗
7.3600
7.4100
7.3200
7.3800
7,882,400
7.4300
7.4500
7.3400
7.4300
7,134,000
Weekend
Weekend
7.2900
7.4100
7.2600
7.4100
9,303,400
7.4800
7.5000
7.1500
7.3100
10,936,400
5 · 6-K
Pre-market · 06:09 ET
6-K ↗
7.6300
7.8600
7.6300
7.7600
9,446,500
7.6900
7.7200
7.6000
7.6000
10,109,100
7.8200
7.9000
7.8000
7.8400
7,479,800
Weekend
Weekend
7.6100
7.8500
7.5700
7.7100
10,153,200
7.4900
7.5900
7.3700
7.5300
9,729,600
7.8000
7.8100
7.2900
7.3900
12,481,800
4 · 6-K
Pre-market · 06:02 ET
6-K ↗
3 · 6-K
Pre-market · 06:00 ET
6-K ↗
7.5500
7.6800
7.5200
7.6300
6,728,000
2 · 6-K
Pre-market · 06:01 ET
6-K ↗
7.5200
7.5800
7.4200
7.5700
8,009,300
1 · 6-K
Pre-market · 06:31 ET
6-K ↗
Weekend
Weekend
7.5700
7.6100
7.5300
7.5400
7,439,900
7.3500
7.5500
7.3500
7.5200
5,612,100
Announcement Events
Each title opens the filing on the SEC website. Registered users can summarise the filing and up to seven relevant exhibits linked within the same SEC submission.