United Microelectronics Corporation (NEW) UMC
Open calendar →United Microelectronics Corporation (NEW) Common Stock · Company · NYSE
USD closing-price chart (daily close from yfinance · Last year)
USD 7.48 → 21.29 · 184.6%
Numbered dotted lines mark the filtered filings under Announcement Events below.
Price & SEC Filing History 23 Jul 2025 — 24 Jul 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
No data yet
No data yet
21.0000
21.5950
20.9900
21.2900
7,338,366
21.5100
21.5100
20.8900
21.1900
17,368,100
62 · 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
61 · 6-K
Pre-market · 06:01 ET
6-K ↗
24.1700
24.4000
23.5700
23.8400
13,175,600
60 · 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
59 · 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
58 · 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
57 · 6-K
Pre-market · 06:02 ET
6-K ↗
26.9000
28.2800
26.8000
27.5000
26,322,100
56 · 6-K
Pre-market · 06:03 ET
6-K ↗
Weekend
Weekend
No trading
23.6300
24.1700
23.1000
24.0800
26,913,600
55 · 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
54 · 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
53 · 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
52 · 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
51 · 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
50 · 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
49 · 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
48 · 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
47 · 6-K
Pre-market · 06:29 ET
6-K ↗
16.1700
16.3000
15.5000
16.0600
19,760,200
46 · 6-K
Pre-market · 06:12 ET
6-K ↗
15.6500
15.9000
15.3900
15.5900
13,858,600
45 · 6-K
Pre-market · 06:01 ET
6-K ↗
Weekend
Weekend
14.5200
15.4500
14.4300
15.4200
14,785,200
44 · 6-K
Pre-market · 06:01 ET
6-K ↗
15.2400
15.4500
15.0200
15.1600
16,029,100
43 · 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
42 · 6-K
Pre-market · 06:10 ET
6-K ↗
41 · 20-F
Pre-market · 06:04 ET
FORM 20-F ↗
12.4300
13.3900
12.1000
12.7500
25,368,600
40 · 6-K
Pre-market · 06:06 ET
6-K ↗
39 · 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
38 · 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
37 · 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
36 · 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
35 · 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
34 · 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
33 · 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
32 · 6-K
Pre-market · 06:03 ET
6-K ↗
31 · 6-K
Pre-market · 06:00 ET
6-K ↗
10.9300
11.0400
10.8900
10.9200
6,955,100
30 · 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
29 · 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
28 · 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
27 · 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
26 · 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
25 · 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
24 · 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
23 · 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
22 · 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
21 · 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
20 · 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
19 · 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
18 · 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
17 · 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
16 · 6-K
Pre-market · 06:02 ET
6-K ↗
15 · 6-K
Pre-market · 06:00 ET
6-K ↗
7.5500
7.6800
7.5200
7.6300
6,728,000
14 · 6-K
Pre-market · 06:01 ET
6-K ↗
7.5200
7.5800
7.4200
7.5700
8,009,300
13 · 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
7.4100
7.4500
7.3000
7.3800
7,880,500
7.4900
7.4900
7.3700
7.4500
6,136,100
12 · 6-K
Pre-market · 06:33 ET
6-K ↗
7.5700
7.5800
7.5200
7.5200
6,255,000
Weekend
Weekend
7.4700
7.5400
7.4000
7.4700
4,302,400
7.4800
7.5500
7.3700
7.4300
6,062,900
7.4200
7.4500
7.3300
7.4200
7,918,000
11 · 6-K
Pre-market · 06:03 ET
6-K ↗
7.4300
7.4700
7.3600
7.4000
6,955,800
7.5000
7.6600
7.4200
7.6400
11,657,500
Weekend
Weekend
7.4800
7.5000
7.1800
7.1800
13,243,400
7.5600
7.5700
7.4100
7.4800
4,254,200
7.3800
7.5500
7.3800
7.5500
6,902,300
7.4500
7.4900
7.2700
7.2900
7,424,600
10 · 6-K
Pre-market · 06:32 ET
6-K ↗
7.2600
7.3500
7.2300
7.3500
8,449,900
Weekend
Weekend
7.3000
7.3300
7.2000
7.2500
5,468,800
7.3000
7.3500
7.2600
7.2900
10,389,000
7.4100
7.4400
7.2800
7.4100
10,250,000
7.5900
7.5900
7.4600
7.5800
8,145,300
7.5800
7.6600
7.5600
7.5900
10,447,100
Weekend
Weekend
7.4200
7.6100
7.4200
7.5400
13,982,900
7.3400
7.4700
7.2700
7.4500
8,468,000
7.4000
7.4900
7.3800
7.4800
5,624,400
7.3600
7.3900
7.3400
7.3700
6,089,800
7.1500
7.2900
7.1500
7.2600
6,847,700
9 · 6-K
Pre-market · 06:23 ET
6-K ↗
Weekend
Weekend
7.1200
7.1600
7.0800
7.1400
6,828,800
6.9300
7.0000
6.9000
6.9900
7,316,500
6.8900
6.9400
6.8200
6.9000
4,454,100
6.8600
6.8900
6.8300
6.8300
3,098,800
6.7800
6.9400
6.7700
6.8500
5,092,900
Weekend
Weekend
6.7800
6.8000
6.7200
6.7600
3,153,600
6.8000
6.8200
6.7600
6.7700
3,545,600
6.8700
6.8700
6.8100
6.8400
3,940,900
8 · 6-K
Pre-market · 06:33 ET
6-K ↗
6.8900
6.9000
6.8500
6.8700
2,941,600
6.8000
6.8900
6.8000
6.8900
3,034,500
Weekend
Weekend
6.7500
6.8100
6.7300
6.8000
4,752,100
6.8300
6.8900
6.8100
6.8800
5,165,400
7 · 6-K
Pre-market · 06:34 ET
6-K ↗
6.6400
6.6900
6.6400
6.6500
5,187,900
6.5900
6.6400
6.5600
6.6200
4,345,100
No trading
Weekend
Weekend
6.6500
6.6600
6.5800
6.5800
6,937,400
6.6800
6.7000
6.6500
6.6900
3,272,200
6.7400
6.7400
6.6600
6.7200
3,354,400
6.7600
6.8000
6.7300
6.7400
5,551,000
6.6800
6.7000
6.6400
6.6600
4,044,300
Weekend
Weekend
6.7900
6.8200
6.6600
6.7700
8,352,800
6.7900
6.8200
6.7400
6.7400
3,758,500
6.8900
6.9100
6.7800
6.8700
9,430,200
6.8600
6.9000
6.7800
6.8000
9,634,300
6.7800
6.8300
6.7600
6.8100
5,480,300
Weekend
Weekend
6.8500
7.2400
6.8100
6.8800
9,589,100
6.7700
6.9400
6.7700
6.8900
9,155,500
6.8200
6.8600
6.7600
6.8400
7,099,200
6 · 6-K
Pre-market · 06:14 ET
6-K ↗
6.7800
6.8200
6.7400
6.8100
8,249,000
5 · 6-K
Pre-market · 06:28 ET
6-K ↗
6.7100
6.8100
6.7100
6.7200
6,974,300
Weekend
Weekend
6.7200
6.7600
6.6900
6.7300
6,532,200
6.7500
6.7800
6.6400
6.6700
9,067,300
6.7400
6.7500
6.6900
6.7400
3,643,500
4 · 6-K
Pre-market · 06:38 ET
6-K ↗
6.8300
6.8600
6.7700
6.8100
5,312,900
6.8300
6.8600
6.8000
6.8100
4,811,500
Weekend
Weekend
6.8900
6.9300
6.8000
6.8100
11,873,800
6.9000
6.9500
6.8000
6.8400
11,453,800
7.0300
7.2400
6.9300
7.1000
18,150,900
3 · 6-K
Pre-market · 06:08 ET
6-K ↗
2 · 6-K
Pre-market · 06:05 ET
6-K ↗
7.1900
7.2400
7.0900
7.1200
10,681,800
7.3000
7.3100
7.1500
7.2000
9,658,600
1 · 6-K
Pre-market · 06:22 ET
6-K ↗
Weekend
Weekend
7.2800
7.3200
7.2300
7.3000
5,667,900
7.4600
7.4600
7.3000
7.3200
4,695,200
7.5000
7.5400
7.4600
7.4800
7,346,300
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.