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HowShorted

MREO short interest Nasdaq Capital Market

Mereo BioPharma Group plc Amer. 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
3,075,927
vs previous settlement
−689,050 (-18.3%)
days to cover
1.96
Settlement date
15 Sep 2026

Shares short over time

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

Fails to deliver

The SEC's fails-to-deliver figure for MREO: 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.

Last balance on file
776
8 Sep 2026
Highest in window
1,768,806
7 Jan 2026
Days with a balance
70
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Mereo BioPharma Group plc Amer 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 1.8M shares.

History

Every FINRA settlement we hold for MREO, newest first.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 20263,075,927−689,0501.96
31 Aug 20263,764,977−551,2883.42
14 Aug 20264,316,265+902,9411.00
31 Jul 20263,413,324−122,5813.36
15 Jul 20263,535,905−2,347,6593.23
30 Jun 20265,883,564+535,9583.18
15 Jun 20265,347,606−2,812,4381.55
29 May 20268,160,044+2,476,1411.00
15 May 20265,683,903−824,3753.14
30 Apr 20266,508,278−1,759,2034.42
15 Apr 20268,267,481−2,639,9674.84
31 Mar 202610,907,448−354,5677.70
13 Mar 202611,262,015−2,502,8307.85
27 Feb 202613,764,845−328,5155.38
13 Feb 202614,093,360+1,050,5853.92
30 Jan 202613,042,775+3,228,4341.50
15 Jan 20269,814,341−703,5931.00
31 Dec 202510,517,934+732,4891.00
15 Dec 20259,785,445+577,5153.35
28 Nov 20259,207,930−41,5717.22
14 Nov 20259,249,501−872,0416.44
31 Oct 202510,121,542−1,040,7456.12
15 Oct 202511,162,287−399,3257.55
30 Sep 202511,561,612+519,53410.69
15 Sep 202511,042,078−250,38610.97
29 Aug 202511,292,464+801,91812.67
15 Aug 202510,490,546−57,7726.51
31 Jul 202510,548,318+703,5755.05
15 Jul 20259,844,743+1,645,7321.50
30 Jun 20258,199,011+239,7237.00
13 Jun 20257,959,288−463,1955.04
30 May 20258,422,483+470,93310.68
15 May 20257,951,550+338,1007.57
30 Apr 20257,613,450+1,016,3303.84
15 Apr 20256,597,120+52,1273.58
31 Mar 20256,544,993+518,0896.16
14 Mar 20256,026,904−333,3454.08
28 Feb 20256,360,249−900,2693.67
14 Feb 20257,260,518+440,14110.46
31 Jan 20256,820,377−382,3515.74
15 Jan 20257,202,728−829,9005.07
31 Dec 20248,032,628+979,2366.78
13 Dec 20247,053,392+422,06810.62
29 Nov 20246,631,324+996,4607.34
15 Nov 20245,634,864+1,069,4357.07
31 Oct 20244,565,429−592,9568.52
15 Oct 20245,158,385+276,8367.66
30 Sep 20244,881,549+340,1815.63
13 Sep 20244,541,368+44,5476.49
30 Aug 20244,496,821−43,9354.50
15 Aug 20244,540,756+167,3254.67
31 Jul 20244,373,431+1,250,0504.95
15 Jul 20243,123,381+200,0323.75
28 Jun 20242,923,349+572,5102.05
14 Jun 20242,350,839−49,7201.38
31 May 20242,400,559+188,5412.67
15 May 20242,212,018−614,4703.03
30 Apr 20242,826,488+59,0873.43
15 Apr 20242,767,401+435,9082.93
28 Mar 20242,331,493+137,5212.08
15 Mar 20242,193,972−35,4401.57
29 Feb 20242,229,412−548,5091.50
15 Feb 20242,777,921+564,7251.63
31 Jan 20242,213,196+819,6491.00
12 Jan 20241,393,547−90,4871.04
29 Dec 20231,484,034−326,0012.19
15 Dec 20231,810,035−932,5032.25
30 Nov 20232,742,538−96,7402.57
15 Nov 20232,839,278−748,9063.29
31 Oct 20233,588,184+426,2521.04
13 Oct 20233,161,932+140,0295.81
29 Sep 20233,021,903−537,2696.36
15 Sep 20233,559,172−1,293,5117.80
31 Aug 20234,852,683−1,133,7433.94
15 Aug 20235,986,426−211,49512.30
31 Jul 20236,197,921−1,499,2473.42
14 Jul 20237,697,168−2,834,07710.46
30 Jun 202310,531,245+1,065,27510.03
15 Jun 20239,465,970+1,214,3372.65
31 May 20238,251,633+3,095,0563.19
15 May 20235,156,577+930,4762.95
28 Apr 20234,226,101+321,8362.14
14 Apr 20233,904,265+92,1723.58
31 Mar 20233,812,093−14,0024.27
15 Mar 20233,826,095+507,8157.64
28 Feb 20233,318,280−648,3474.09
15 Feb 20233,966,627+427,4213.10
31 Jan 20233,539,206−172,4593.77
13 Jan 20233,711,665+220,8215.31
30 Dec 20223,490,844−1,317,1282.57
15 Dec 20224,807,972−155,6757.60
30 Nov 20224,963,647−138,47122.16
15 Nov 20225,102,118−603,78212.79
31 Oct 20225,705,900−388,64414.86
14 Oct 20226,094,544−334,69114.90
30 Sep 20226,429,235−321,22515.12
15 Sep 20226,750,460−269,11410.66
31 Aug 20227,019,574+709,1676.39
15 Aug 20226,310,407+1,513,6914.54
29 Jul 20224,796,716−411,9502.89
15 Jul 20225,208,666−683,3661.64
30 Jun 20225,892,032+2,335,6801.00
15 Jun 20223,556,352−546,3083.75
31 May 20224,102,660−1,347,6825.32
13 May 20225,450,342−1,396,9031.97
29 Apr 20226,847,245−152,0127.67
14 Apr 20226,999,257−64,94512.82
31 Mar 20227,064,202−69,78910.07
15 Mar 20227,133,991+472,52719.17
28 Feb 20226,661,464−719,90919.12
15 Feb 20227,381,373+19219.74
31 Jan 20227,381,181+264,32711.44
14 Jan 20227,116,854+688,5269.79
31 Dec 20216,428,328+961,6856.46
15 Dec 20215,466,643+226,7755.72
30 Nov 20215,239,868−4,839,5314.01
15 Nov 202110,079,399+1,710,80914.77
29 Oct 20218,368,590−326,74315.26
15 Oct 20218,695,333+1,464,3679.52
30 Sep 20217,230,966−291,3366.81
15 Sep 20217,522,302−181,93915.07
31 Aug 20217,704,241−173,9128.41
13 Aug 20217,878,153−33,6897.42
30 Jul 20217,911,842+334,5256.15
15 Jul 20217,577,317−3,578,3255.04
30 Jun 202111,155,642+4,015,1275.22
15 Jun 20217,140,515−1,551,2214.45
28 May 20218,691,736+486,00012.09
14 May 20218,205,736+40,2438.46
30 Apr 20218,165,493−1,475,1408.72
15 Apr 20219,640,633+1,421,3875.06
31 Mar 20218,219,246+3,422,5303.57
15 Mar 20214,796,716+1,022,3901.83
26 Feb 20213,774,326−4,774,3651.00
12 Feb 20218,548,691+1,486,4384.21
29 Jan 20217,062,253+490,4379.52
15 Jan 20216,571,816+909,39413.63
31 Dec 20205,662,422+4,039,8011.00
15 Dec 20201,622,621+407,7412.28
30 Nov 20201,214,880−18,7037.49
13 Nov 20201,233,583−3,30815.21
30 Oct 20201,236,891+153,48012.38
15 Oct 20201,083,411+137,0814.73
30 Sep 2020946,330−4,9799.18
15 Sep 2020951,309+135,6554.34
31 Aug 2020815,654+393,2582.26
14 Aug 2020422,396−18,2801.60
31 Jul 2020440,676−7,0132.72
15 Jul 2020447,689+13,2402.90
30 Jun 2020434,449+211,3471.00
15 Jun 2020223,102+213,4101.00
29 May 20209,692+3,5471.00
15 May 20206,145−5,5011.00
30 Apr 202011,646−7,6511.00
15 Apr 202019,297−14,9841.00
31 Mar 202034,281+5751.04
13 Mar 202033,706+7,8061.00
28 Feb 202025,900−45,6331.00
14 Feb 202071,533+42,5311.00
31 Jan 202029,002−18,1041.00
15 Jan 202047,106−262,6701.00
31 Dec 2019309,776+307,2771.00
13 Dec 20192,499+1,5221.00
29 Nov 2019977+8241.00
15 Nov 2019153−3,6071.00
31 Oct 20193,760−4,3351.00
15 Oct 20198,095+5,5061.00
30 Sep 20192,589−5,9891.00
13 Sep 20198,578−1,3861.58
30 Aug 20199,964+2,1981.00
15 Aug 20197,766+4,1371.00
31 Jul 20193,629−7141.00
15 Jul 20194,343+5311.00
28 Jun 20193,812+1,5231.00
14 Jun 20192,289+1,5581.00
31 May 2019731−3,6261.00
15 May 20194,357−2,3001.00
30 Apr 20196,657–1.00

Scroll inside the table for earlier settlements, back to 30 Apr 2019.

Questions

Frequently asked questions

What is MREO's short interest?
3,075,927 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, down 689,050 from the previous settlement.
Why is there no percentage for MREO?
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 MREO's days to cover?
1.96 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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