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HowShorted

UMC short interest NYSE

United Microelectronic Corp.. FINRA's reported shares short for this symbol, twice a month by settlement date, shown as the regulator publishes them. No percentage is shown: an SEC filer exists but no defensible share count is available yet.

Shares short
38,400,261
vs previous settlement
+4,732,090 (+14.1%)
days to cover
3.56
Settlement date
15 Sep 2026

Shares short over time

Aggregate net short position time series for UMC shares short

Days to cover

FINRA's own figure: reported shares short divided by the security's average daily trading volume, published alongside each settlement.

Aggregate net short position time series for UMC days to cover

Fails to deliver

The SEC's fails-to-deliver figure for UMC: the aggregate net balance of shares that failed to be delivered at each settlement date, published by the SEC twice a month and shown here verbatim for the trailing window. A balance is not a daily flow, and a fail has many ordinary causes; the SEC says it cannot guarantee the accuracy of the data. See what fails to deliver are and the largest balances today.

Latest balance
1,493
14 Sep 2026
Highest in window
1,306,976
26 Jan 2026
Days with a balance
181
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for United Microelectronic Corp. fails to deliver

Source: U.S. Securities and Exchange Commission, fails-to-deliver data (public domain). Only settlement days with a positive balance appear; the largest balance in the window was 1.3M shares.

History

Every FINRA settlement we hold for UMC, newest first. สณ marks a figure FINRA itself flagged as revised.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 202638,400,261+4,732,0903.56
31 Aug 202633,668,171+3,973,0852.96
14 Aug 202629,695,086โˆ’4,498,5482.58
31 Jul 202634,193,634+13,682,0471.90
15 Jul 202620,511,587โˆ’5,665,5721.24
30 Jun 202626,177,159+846,1491.31
15 Jun 202625,331,010โˆ’767,3891.35
29 May 202626,098,399โˆ’818,5391.46
15 May 202626,916,938+252,8631.64
30 Apr 202626,664,075+834,3191.77
15 Apr 202625,829,756โˆ’4,436,8443.07
31 Mar 202630,266,600โˆ’3,921,8813.70
13 Mar 202634,188,481+3,751,0113.98
27 Feb 202630,437,470โˆ’1,174,3594.66
13 Feb 202631,611,829โˆ’245,3792.99
30 Jan 202631,857,208โˆ’16,150,1611.73
15 Jan 202648,007,369+5,915,4564.07
31 Dec 202542,091,913โˆ’3,819,4006.51
15 Dec 202545,911,313โˆ’1,943,1704.91
28 Nov 202547,854,483โˆ’2,714,0125.78
14 Nov 202550,568,495โˆ’1,454,3146.06
31 Oct 202552,022,809+3,978,3656.88
15 Oct 202548,044,444โˆ’6,688,1895.69
30 Sep 202554,732,633โˆ’1,909,6647.40
15 Sep 202556,642,297+4,152,07313.76
29 Aug 202552,490,224+1,775,2148.78
15 Aug 202550,715,010โˆ’1,879,9256.78
31 Jul 202552,594,935โˆ’3,897,6506.57
15 Jul 202556,492,585โˆ’5,393,2749.25
30 Jun 202561,885,859โˆ’7,970,8536.77
13 Jun 202569,856,712โˆ’4,833,7407.07
30 May 202574,690,452+2,118,9608.98
15 May 202572,571,492+3,087,0926.57
30 Apr 202569,484,400โˆ’7,971,6345.68
15 Apr 202577,456,034โˆ’1,994,4084.29
31 Mar 202579,450,442โˆ’7,758,6245.44
14 Mar 202587,209,066+3,905,4864.78
28 Feb 202583,303,580+3,626,4595.44
14 Feb 202579,677,121+2,438,5736.44
31 Jan 202577,238,548+1,488,2205.49
15 Jan 202575,750,328โˆ’4,799,9987.57
31 Dec 202480,550,326โˆ’149,0767.11
13 Dec 202480,699,402+1,634,8737.09
29 Nov 202479,064,529+3,746,8518.47
15 Nov 202475,317,678+16,781,0955.40
31 Oct 202458,536,583+4,886,3034.54
15 Oct 202453,650,280+5,537,0875.56
30 Sep 202448,113,193+1,735,3873.99
13 Sep 202446,377,806+1,057,9253.00
30 Aug 202445,319,881โˆ’2,099,4704.00
15 Aug 202447,419,351+3,668,8172.80
31 Jul 202443,750,534โˆ’10,357,9972.44
15 Jul 202454,108,531โˆ’1,455,7685.68
28 Jun 202455,564,299โˆ’2,122,8626.25
14 Jun 202457,687,161โˆ’2,360,8648.01
31 May 202460,048,025+5,539,3156.90
15 May 202454,508,710โˆ’1,983,4068.09
30 Apr 202456,492,116โˆ’3,561,5745.45
15 Apr 202460,053,690โˆ’2,137,2088.39
28 Mar 202462,190,898+3,724,1229.79
15 Mar 202458,466,776+1,370,2786.17
29 Feb 202457,096,498โˆ’316,1639.52
15 Feb 202457,412,661โˆ’25,8977.98
31 Jan 202457,438,558โˆ’3,010,4476.05
12 Jan 202460,449,005+86,8719.37
29 Dec 202360,362,134โˆ’3,458,76610.32
15 Dec 202363,820,900+441,69710.40
30 Nov 202363,379,203โˆ’2,315,32211.98
15 Nov 202365,694,525+3,834,6179.71
31 Oct 202361,859,908+1,710,3677.89
13 Oct 202360,149,541+1,549,14211.64
29 Sep 202358,600,399+7,841,0819.78
15 Sep 202350,759,318+906,4869.53
31 Aug 202349,852,832+1,620,9878.60
15 Aug 202348,231,845+2,667,5028.88
31 Jul 202345,564,343+1,408,2466.72
14 Jul 202344,156,097โˆ’1,350,7297.31
30 Jun 202345,506,826โˆ’3,893,5287.70
15 Jun 202349,400,354โˆ’4,483,9617.97
31 May 202353,884,315สณ+2,868,2676.37
15 May 202351,016,048+2,303,0609.83
28 Apr 202348,712,988โˆ’1,304,7306.62
14 Apr 202350,017,718โˆ’1,198,6339.95
31 Mar 202351,216,351โˆ’3,590,3497.25
15 Mar 202354,806,700+420,4368.13
28 Feb 202354,386,264+2,859,6267.49
15 Feb 202351,526,638โˆ’1,753,6685.64
31 Jan 202353,280,306+1,120,8536.64
13 Jan 202352,159,453+1,595,0886.71
30 Dec 202250,564,365+1,175,9776.75
15 Dec 202249,388,388โˆ’496,3156.88
30 Nov 202249,884,703โˆ’843,0076.15
15 Nov 202250,727,710โˆ’6,991,0943.67
31 Oct 202257,718,804+6,528,9255.00
14 Oct 202251,189,879โˆ’1,216,0134.23
30 Sep 202252,405,892+2,894,2667.09
15 Sep 202249,511,626โˆ’1,948,1547.06
31 Aug 202251,459,780+1,424,1617.65
15 Aug 202250,035,619โˆ’10,257,3376.14
29 Jul 202260,292,956+3,072,5436.12
15 Jul 202257,220,413+3,549,9075.54
30 Jun 202253,670,506+683,8755.26
15 Jun 202252,986,631โˆ’2,137,7186.90
31 May 202255,124,349โˆ’1,443,4767.85
13 May 202256,567,825โˆ’36,2516.16
29 Apr 202256,604,076โˆ’4,409,3845.61
14 Apr 202261,013,460+8,060,0256.40
31 Mar 202252,953,435+392,2375.34
15 Mar 202252,561,198+1,790,8144.70
28 Feb 202250,770,384โˆ’4,804,7615.18
15 Feb 202255,575,145+5,078,2425.54
31 Jan 202250,496,903+8,615,8463.47
14 Jan 202241,881,057+5,646,5165.01
31 Dec 202136,234,541+3,517,8397.17
15 Dec 202132,716,702โˆ’1,067,2163.83
30 Nov 202133,783,918โˆ’2,598,4725.39
15 Nov 202136,382,390+9,564,5494.44
29 Oct 202126,817,841+4,100,7072.75
15 Oct 202122,717,134+4,544,7352.79
30 Sep 202118,172,399โˆ’1,464,4513.46
15 Sep 202119,636,850+662,2872.65
31 Aug 202118,974,563+5,143,5782.25
13 Aug 202113,830,985+2,396,5182.00
30 Jul 202111,434,467โˆ’1,082,5811.38
15 Jul 202112,517,048โˆ’1,650,8212.09
30 Jun 202114,167,869+259,4772.75
15 Jun 202113,908,392สณโˆ’1,233,1642.64
28 May 202115,141,556+2,991,0372.09
14 May 202112,150,519+2,681,2321.99
30 Apr 20219,469,287โˆ’1,795,4751.46
15 Apr 202111,264,762โˆ’190,8532.47
31 Mar 202111,455,615โˆ’3,649,2012.29
15 Mar 202115,104,816โˆ’60,8431.97
26 Feb 202115,165,659โˆ’410,1092.11
12 Feb 202115,575,768โˆ’1,692,9382.41
29 Jan 202117,268,706+7,865,5131.69
15 Jan 20219,403,193+1,667,1151.64
31 Dec 20207,736,078+181,7462.10
15 Dec 20207,554,332+2,215,9151.07
30 Nov 20205,338,417+3,633,3231.32
13 Nov 20201,705,094+289,6471.00
30 Oct 20201,415,447+326,5881.00
15 Oct 20201,088,859+334,5181.00
30 Sep 2020754,341โˆ’27,4481.00
15 Sep 2020781,789+292,9271.00
31 Aug 2020488,862โˆ’100,6321.00
14 Aug 2020589,494โˆ’439,4161.00
31 Jul 20201,028,910+232,8401.00
15 Jul 2020796,070โˆ’94,1831.00
30 Jun 2020890,253โˆ’147,1031.56
15 Jun 20201,037,356+78,9901.00
29 May 2020958,366+179,3691.77
15 May 2020778,997+141,5011.21
30 Apr 2020637,496โˆ’425,9741.00
15 Apr 20201,063,470โˆ’85,4511.17
31 Mar 20201,148,921+333,5851.00
13 Mar 2020815,336+479,8601.00
28 Feb 2020335,476โˆ’386,2521.00
14 Feb 2020721,728โˆ’339,4331.00
31 Jan 20201,061,161+94,1462.98
15 Jan 2020967,015โˆ’995,1492.63
31 Dec 20191,962,164โˆ’91,6623.62
13 Dec 20192,053,826+948,8691.89
29 Nov 20191,104,957โˆ’464,6921.80
15 Nov 20191,569,649+248,7093.48
31 Oct 20191,320,940โˆ’32,5044.23
15 Oct 20191,353,444+79,6602.30
30 Sep 20191,273,784โˆ’49,4181.89
13 Sep 20191,323,202โˆ’28,1852.68
30 Aug 20191,351,387โˆ’240,9852.43
15 Aug 20191,592,372+20,0853.14
31 Jul 20191,572,287+87,9943.48
15 Jul 20191,484,293โˆ’85,2262.00
28 Jun 20191,569,519โˆ’530,4532.16
14 Jun 20192,099,972โˆ’222,0733.99
31 May 20192,322,045โˆ’268,1364.57
15 May 20192,590,181โˆ’657,6085.67
30 Apr 20193,247,789+172,0895.10
15 Apr 20193,075,700โˆ’218,3277.20
29 Mar 20193,294,027โˆ’164,9138.09
15 Mar 20193,458,940+122,6874.56
28 Feb 20193,336,253+152,5686.83
15 Feb 20193,183,685โˆ’100,6343.72
31 Jan 20193,284,319โˆ’737,5784.66
15 Jan 20194,021,897+275,5505.11
31 Dec 20183,746,347+357,6583.37
14 Dec 20183,388,689+477,6692.50
30 Nov 20182,911,020โˆ’32,7373.18
15 Nov 20182,943,757+933,6501.34
31 Oct 20182,010,107+636,6951.53
15 Oct 20181,373,412โˆ’78,9781.44
28 Sep 20181,452,390โˆ’24,6151.58
14 Sep 20181,477,005+10,4781.79
31 Aug 20181,466,527+198,4822.31
15 Aug 20181,268,045โˆ’58,8931.10
31 Jul 20181,326,938โˆ’1,526,0781.00
13 Jul 20182,853,016สณโˆ’436,5381.50
29 Jun 20183,289,554+247,2523.36
15 Jun 20183,042,302โˆ’1,798,3032.28
31 May 20184,840,605โˆ’266,56310.47
15 May 20185,107,168โˆ’564,25014.20
30 Apr 20185,671,418โˆ’722,0299.69
13 Apr 20186,393,447+693,9886.46
29 Mar 20185,699,459โˆ’6,316,6393.72
15 Mar 201812,016,098โˆ’2,179,55911.61
28 Feb 201814,195,657โˆ’729,15627.21
15 Feb 201814,924,813โˆ’17,30910.53
31 Jan 201814,942,122+2,697,01814.28
12 Jan 201812,245,104โˆ’876,94812.55
29 Dec 201713,122,052โ€“11.85

Scroll inside the table for earlier settlements, back to 29 Dec 2017.

Questions

Frequently asked questions

What is UMC's short interest?
38,400,261 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, up 4,732,090 from the previous settlement.
Why is there no percentage for UMC?
Because no defensible share count exists to divide by: an SEC filer exists but no defensible share count is available yet. The symbol maps to an SEC filer, but its share count cannot be used yet. A newly listed company needs two cover-page counts on file before the first is trusted; a split or an unexplained jump pauses publication until a fresh SEC count corroborates it; a secondary share class publishes under the company's primary line; and a foreign filer's short count is in depositary-share units. This page upgrades to a percentage automatically once a defensible count exists.
What is UMC's days to cover?
3.56 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume, published in the same file and shown verbatim. We hold no volume data ourselves.
Is this the short float?
No. This page shows FINRA's share count only. Short float divides that count by the public float, and short interest as we publish it elsewhere divides it by shares outstanding from SEC filings. Neither denominator is available for this line, so neither ratio is shown.
How often does this update?
FINRA member firms report short positions as of the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. We ingest each file the day it appears and re-read recent settlements for revisions.

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