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FBLG short interest Nasdaq Capital Market

FibroBiologics, Inc. Common St. 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
661,912
vs previous settlement
+248,170 (+60.0%)
days to cover
1.85
Settlement date
15 Sep 2026

Shares short over time

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

Fails to deliver

The SEC's fails-to-deliver figure for FBLG: 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
1,650
10 Sep 2026
Highest in window
1,555,911
2 Oct 2025
Days with a balance
132
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for FibroBiologics, Inc. Common St 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 1.6M shares.

History

Every FINRA settlement we hold for FBLG, newest first.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 2026661,912+248,1701.85
31 Aug 2026413,742+272,0281.40
14 Aug 2026141,714+26,5141.00
31 Jul 2026115,200+44,3631.27
15 Jul 202670,837−64,9571.19
30 Jun 2026135,794−1,2331.00
15 Jun 2026137,027+1,4361.00
29 May 2026135,591−102,0491.36
15 May 2026237,640+119,2261.00
30 Apr 2026118,414+18,4401.00
15 Apr 202699,974−109,6121.00
31 Mar 2026209,586−663,9411.00
13 Mar 2026873,527+202,2481.00
27 Feb 2026671,279+41,2591.15
13 Feb 2026630,020−221,7231.00
30 Jan 2026851,743+478,8881.24
15 Jan 2026372,855−534,2211.00
31 Dec 2025907,076+111,7411.00
15 Dec 2025795,335−594,3061.00
28 Nov 20251,389,641−21,1601.00
14 Nov 20251,410,801−400,7231.36
31 Oct 20251,811,524−218,4181.84
15 Oct 20252,029,942+1,064,0891.64
30 Sep 2025965,853−4,7071.10
15 Sep 2025970,560+53,0112.13
29 Aug 2025917,549−181,0022.19
15 Aug 20251,098,551+59,3032.28
31 Jul 20251,039,248+308,6672.09
15 Jul 2025730,581−21,3451.62
30 Jun 2025751,926−595,1911.11
13 Jun 20251,347,117+97,8044.17
30 May 20251,249,313−317,7786.88
15 May 20251,567,091−22,6558.26
30 Apr 20251,589,746+61,8205.32
15 Apr 20251,527,926−723,8247.17
31 Mar 20252,251,750+38,46619.65
14 Mar 20252,213,284+168,17712.60
28 Feb 20252,045,107+94,2687.55
14 Feb 20251,950,839+146,2242.41
31 Jan 20251,804,615−696,6577.52
15 Jan 20252,501,272+27,71820.23
31 Dec 20242,473,554−23,15016.94
13 Dec 20242,496,704−203,02821.63
29 Nov 20242,699,732+170,50417.22
15 Nov 20242,529,228+169,06410.57
31 Oct 20242,360,164+8,58014.71
15 Oct 20242,351,584+105,95318.05
30 Sep 20242,245,631+395,8834.10
13 Sep 20241,849,748+354,0451.38
30 Aug 20241,495,703+378,5444.95
15 Aug 20241,117,159+487,9594.21
31 Jul 2024629,200−19,0706.58
15 Jul 2024648,270+420,1823.15
28 Jun 2024228,088+79,1871.00
14 Jun 2024148,901+10,1161.00
31 May 2024138,785+36,3841.95
15 May 2024102,401+95,6271.66
30 Apr 20246,774+2,3601.00
15 Apr 20244,414+2,9631.00
28 Mar 20241,451−5,9171.00
15 Mar 20247,368+4021.00
29 Feb 20246,966−66,7721.00
15 Feb 202473,738–1.00

Scroll inside the table for earlier settlements, back to 15 Feb 2024.

Questions

Frequently asked questions

What is FBLG's short interest?
661,912 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, up 248,170 from the previous settlement.
Why is there no percentage for FBLG?
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 FBLG's days to cover?
1.85 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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