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HowShorted

MUB short interest NYSE Arca

iShares National Muni Bond ETF. FINRA's reported shares short for this symbol, twice a month by settlement date, shown as the regulator publishes them. No percentage is shown: exchange-traded product: its share count floats with creation and redemption.

Shares short
11,953,104
vs previous settlement
+3,879,819 (+48.1%)
days to cover
1.04
Settlement date
15 Sep 2026

Shares short over time

Aggregate net short position time series for MUB 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 MUB days to cover

Fails to deliver

The SEC's fails-to-deliver figure for MUB: 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
1,543,494
14 Sep 2026
Highest in window
1,543,494
14 Sep 2026
Days with a balance
188
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for iShares National Muni Bond ETF 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 1.5M shares.

History

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

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 202611,953,104+3,879,8191.04
31 Aug 20268,073,285+2,442,0501.89
14 Aug 20265,631,235โˆ’441,8221.39
31 Jul 20266,073,057+520,9241.29
15 Jul 20265,552,133+1,215,7811.67
30 Jun 20264,336,352โˆ’1,064,0761.42
15 Jun 20265,400,428+1,285,0751.52
29 May 20264,115,353โˆ’935,7461.06
15 May 20265,051,099โˆ’1,339,7141.65
30 Apr 20266,390,813+359,3982.24
15 Apr 20266,031,415โˆ’339,7981.50
31 Mar 20266,371,213โˆ’1,527,4101.25
13 Mar 20267,898,623+135,9082.08
27 Feb 20267,762,715โˆ’634,3412.92
13 Feb 20268,397,056+1,158,0552.48
30 Jan 20267,239,001โˆ’514,6581.78
15 Jan 20267,753,659+922,9241.71
31 Dec 20256,830,735โˆ’71,2912.10
15 Dec 20256,902,026+81,2682.06
28 Nov 20256,820,758โˆ’687,4071.57
14 Nov 20257,508,165+209,8131.73
31 Oct 20257,298,352โˆ’191,6671.95
15 Oct 20257,490,019+563,7372.47
30 Sep 20256,926,282โˆ’332,9031.41
15 Sep 20257,259,185โˆ’139,1751.48
29 Aug 20257,398,360+393,8671.61
15 Aug 20257,004,493+292,0671.52
31 Jul 20256,712,426+505,7791.00
15 Jul 20256,206,647+188,3621.35
30 Jun 20256,018,285โˆ’308,2771.37
13 Jun 20256,326,562+477,4671.00
30 May 20255,849,095โˆ’542,2091.02
15 May 20256,391,304+369,3741.18
30 Apr 20256,021,930โˆ’1,506,4771.00
15 Apr 20257,528,407+1,589,0301.00
31 Mar 20255,939,377โˆ’1,145,6331.13
14 Mar 20257,085,010+2,038,1911.43
28 Feb 20255,046,819โˆ’12,5401.58
14 Feb 20255,059,359+821,9861.29
31 Jan 20254,237,373โˆ’3,386,5071.00
15 Jan 20257,623,880+1,716,2241.65
31 Dec 20245,907,656โˆ’1,145,4831.11
13 Dec 20247,053,139+544,9502.12
29 Nov 20246,508,189+781,6962.50
15 Nov 20245,726,493+126,3311.19
31 Oct 20245,600,162+177,7071.35
15 Oct 20245,422,455+1,026,7921.78
30 Sep 20244,395,663โˆ’667,7201.74
13 Sep 20245,063,383+244,6271.47
30 Aug 20244,818,756โˆ’1,205,4902.04
15 Aug 20246,024,246โˆ’148,1531.54
31 Jul 20246,172,399+1,525,1092.30
15 Jul 20244,647,290+139,6851.71
28 Jun 20244,507,605+1,034,3081.78
14 Jun 20243,473,297โˆ’2,127,3521.00
31 May 20245,600,649+3,109,8751.43
15 May 20242,490,774โˆ’69,1871.00
30 Apr 20242,559,961โˆ’3,064,3591.00
15 Apr 20245,624,320โˆ’240,3651.22
28 Mar 20245,864,685โˆ’281,9902.35
15 Mar 20246,146,675+1,698,5292.54
29 Feb 20244,448,146+11,1851.51
15 Feb 20244,436,961+577,9181.13
31 Jan 20243,859,043โˆ’4,738,1101.00
12 Jan 20248,597,153+2,943,0131.63
29 Dec 20235,654,140+1,234,3221.47
15 Dec 20234,419,818+2,303,2631.04
30 Nov 20232,116,555โˆ’638,5031.00
15 Nov 20232,755,058สณ+203,7011.00
31 Oct 20232,551,357โˆ’4,4991.00
13 Oct 20232,555,856โˆ’1,052,5641.00
29 Sep 20233,608,420+1,702,3661.00
15 Sep 20231,906,054โˆ’146,1651.00
31 Aug 20232,052,219โˆ’1,330,8251.00
15 Aug 20233,383,044โˆ’31,1821.37
31 Jul 20233,414,226โˆ’150,4451.57
14 Jul 20233,564,671+750,4401.73
30 Jun 20232,814,231+318,7851.73
15 Jun 20232,495,446+382,9671.33
31 May 20232,112,479+63,2621.00
15 May 20232,049,217โˆ’1,066,0281.02
28 Apr 20233,115,245+1,344,5721.18
14 Apr 20231,770,673โˆ’250,8801.03
31 Mar 20232,021,553โˆ’672,4741.05
15 Mar 20232,694,027+410,7271.00
28 Feb 20232,283,300โˆ’2,107,1561.00
15 Feb 20234,390,456+1,109,8161.63
31 Jan 20233,280,640+578,0961.00
13 Jan 20232,702,544โˆ’930,2881.00
30 Dec 20223,632,832โˆ’31,7131.00
15 Dec 20223,664,545+1,813,1201.00
30 Nov 20221,851,425โˆ’1,148,3171.00
15 Nov 20222,999,742+1,019,9461.00
31 Oct 20221,979,796โˆ’449,0891.00
14 Oct 20222,428,885+287,5251.00
30 Sep 20222,141,360โˆ’1,321,8481.00
15 Sep 20223,463,208+397,5671.00
31 Aug 20223,065,641+487,4731.00
15 Aug 20222,578,168โˆ’183,8671.00
29 Jul 20222,762,035+804,2401.00
15 Jul 20221,957,795+213,4551.00
30 Jun 20221,744,340โˆ’5,373,6361.00
15 Jun 20227,117,976+3,884,2531.00
31 May 20223,233,723โˆ’1,097,2811.00
13 May 20224,331,004+399,2511.00
29 Apr 20223,931,753+694,1421.00
14 Apr 20223,237,611+184,1291.00
31 Mar 20223,053,482โˆ’506,9291.00
15 Mar 20223,560,411+114,5221.00
28 Feb 20223,445,889โˆ’759,4191.29
15 Feb 20224,205,308โˆ’1,185,0741.52
31 Jan 20225,390,382+1,892,3311.49
14 Jan 20223,498,051โˆ’1,333,6921.68
31 Dec 20214,831,743+1,345,5623.22
15 Dec 20213,486,181+429,6822.38
30 Nov 20213,056,499+1,402,2301.93
15 Nov 20211,654,269โˆ’426,4121.09
29 Oct 20212,080,681โˆ’381,4301.65
15 Oct 20212,462,111โˆ’485,0442.10
30 Sep 20212,947,155+476,3582.05
15 Sep 20212,470,797โˆ’55,5772.39
31 Aug 20212,526,374+434,8622.68
13 Aug 20212,091,512โˆ’667,7662.08
30 Jul 20212,759,278โˆ’1,411,2921.95
15 Jul 20214,170,570+50,5194.09
30 Jun 20214,120,051+1,187,3684.34
15 Jun 20212,932,683สณ+717,2042.99
28 May 20212,215,479+264,9512.50
14 May 20211,950,528+166,4671.65
30 Apr 20211,784,061โˆ’1,400,0411.19
15 Apr 20213,184,102โˆ’149,5802.68
31 Mar 20213,333,682โˆ’335,2673.02
15 Mar 20213,668,949+144,2433.15
26 Feb 20213,524,706โˆ’161,5692.17
12 Feb 20213,686,275โˆ’63,1803.64
29 Jan 20213,749,455+883,9053.17
15 Jan 20212,865,550+600,6071.95
31 Dec 20202,264,943+353,8312.31
15 Dec 20201,911,112โˆ’771,3612.01
30 Nov 20202,682,473+393,0282.37
13 Nov 20202,289,445โˆ’332,5521.61
30 Oct 20202,621,997โˆ’426,6092.88
15 Oct 20203,048,606โˆ’339,4612.83
30 Sep 20203,388,067โˆ’77,6163.07
15 Sep 20203,465,683โˆ’201,7193.30
31 Aug 20203,667,402+130,2362.94
14 Aug 20203,537,166+2,023,2033.84
31 Jul 20201,513,963+299,0071.85
15 Jul 20201,214,956โˆ’434,1531.53
30 Jun 20201,649,109โˆ’413,7541.92
15 Jun 20202,062,863+632,0591.47
29 May 20201,430,804+33,7891.72
15 May 20201,397,015โˆ’1,5971.14
30 Apr 20201,398,612+534,8551.13
15 Apr 2020863,757โˆ’1,826,7151.00
31 Mar 20202,690,472+1,149,4971.00
13 Mar 20201,540,975โˆ’17,1631.00
28 Feb 20201,558,138โˆ’91,8001.23
14 Feb 20201,649,938+273,9102.52
31 Jan 20201,376,028โˆ’5,5201.12
15 Jan 20201,381,548+867,0901.16
31 Dec 2019514,458โˆ’206,4481.00
13 Dec 2019720,906+127,2561.16
29 Nov 2019593,650โˆ’157,6181.00
15 Nov 2019751,268+437,0201.11
31 Oct 2019314,248โˆ’843,7811.00
15 Oct 20191,158,029+637,1631.52
30 Sep 2019520,866+172,4561.00
13 Sep 2019348,410สณ+136,3181.00
30 Aug 2019212,092โˆ’237,1291.00
15 Aug 2019449,221+68,4341.00
31 Jul 2019380,787โˆ’303,1461.00
15 Jul 2019683,933+143,8251.00
28 Jun 2019540,108โˆ’177,9501.00
14 Jun 2019718,058+286,1921.00
31 May 2019431,866โˆ’41,7961.00
15 May 2019473,662โˆ’44,2431.00
30 Apr 2019517,905+80,0961.00
15 Apr 2019437,809+238,0231.00
29 Mar 2019199,786โˆ’96,0271.00
15 Mar 2019295,813+91,5471.00
28 Feb 2019204,266โˆ’148,0341.00
15 Feb 2019352,300+124,1201.00
31 Jan 2019228,180โˆ’369,0901.00
15 Jan 2019597,270+85,7481.00
31 Dec 2018511,522โˆ’405,5241.00
14 Dec 2018917,046+469,0811.00
30 Nov 2018447,965โˆ’133,2771.00
15 Nov 2018581,242+334,0641.00
31 Oct 2018247,178โˆ’456,0471.00
15 Oct 2018703,225โˆ’7,0481.00
28 Sep 2018710,273+363,9861.00
14 Sep 2018346,287โˆ’97,0091.00
31 Aug 2018443,296โˆ’90,1011.06
15 Aug 2018533,397+203,2141.02
31 Jul 2018330,183โˆ’138,8371.00
13 Jul 2018469,020+81,9761.13
29 Jun 2018387,044โˆ’214,3901.00
15 Jun 2018601,434+119,7621.00
31 May 2018481,672โˆ’49,2851.00
15 May 2018530,957โˆ’16,1991.16
30 Apr 2018547,156+31,6521.00
13 Apr 2018515,504โˆ’28,4091.03
29 Mar 2018543,913โˆ’8,1131.13
15 Mar 2018552,026+32,8831.32
28 Feb 2018519,143โˆ’10,8381.04
15 Feb 2018529,981+49,9701.00
31 Jan 2018480,011โˆ’170,6991.00
12 Jan 2018650,710สณโˆ’28,2461.00
29 Dec 2017678,956โ€“1.00

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

Questions

Frequently asked questions

What is MUB's short interest?
11,953,104 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, up 3,879,819 from the previous settlement.
Why is there no percentage for MUB?
Because no defensible share count exists to divide by: exchange-traded product: its share count floats with creation and redemption. An exchange-traded product's share count changes every day as units are created and redeemed, so no filing gives a stable count to divide by. FINRA's shares-short figure is exact; a percentage of it would not be.
What is MUB's days to cover?
1.04 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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