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HowShorted

How shorted is Caribou Biosciences, Inc.? CRBU

#484most shorted US stockof 3,805 ranked stocks, more shorted than 87%

12.11%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.45
5 reports (~10 weeks)
+2.40
days to cover
9.49
Aggregate net short position time series for Caribou Biosciences, Inc.

Markers along the chart's base: ▲ results announced (an 8-K reporting results was filed) ▲ quarterly or annual report filed. Dates are SEC filing dates; hover a point to see events since the previous settlement.

Days to cover

FINRA's own figure: reported shares short divided by the stock's average daily trading volume, published alongside each settlement. It expresses the short position in days of typical trading rather than as a percentage of the company; the two can move differently.

Aggregate net short position time series for Caribou Biosciences, Inc. days to cover

Short interest around results

For each results announcement (an 8-K reporting results, by its SEC filing date), the FINRA settlement before it and the first one after. Settlements fall twice a month, so the two figures can sit up to a month apart and much else changes in between: this shows what was reported, not why.

Reported short interest before and after each results announcement
Results filedSettlement beforeSettlement afterChange
13 Aug 202611.74% 31 Jul 202611.63% 14 Aug 2026−0.11
7 May 20267.18% 30 Apr 20267.20% 15 May 2026+0.02
5 Mar 20267.74% 27 Feb 20267.55% 13 Mar 2026−0.19
12 Nov 20253.81% 31 Oct 20256.01% 14 Nov 2025+2.20
3 Nov 20253.81% 31 Oct 20256.01% 14 Nov 2025+2.20
12 Aug 20254.19% 31 Jul 20254.18% 15 Aug 2025−0.01
8 May 20258.21% 30 Apr 202510.21% 15 May 2025+2.00
24 Apr 202510.19% 15 Apr 20258.21% 30 Apr 2025−1.98

Fails to deliver

The SEC's fails-to-deliver figure for CRBU: 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
76,175
14 Sep 2026
Highest in window
148,377
4 Nov 2025
Days with a balance
61
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Caribou Biosciences, Inc. 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 148K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202612.11%+0.45
31 Aug 202611.66%+0.03
14 Aug 202611.63%−0.11
31 Jul 202611.74%+0.05
15 Jul 202611.69%+1.98
30 Jun 20269.71%+2.12
15 Jun 20267.59%+0.08
29 May 20267.51%+0.31
15 May 20267.20%+0.02
30 Apr 20267.18%−0.06
15 Apr 20267.24%+0.32
31 Mar 20266.92%−0.63
13 Mar 20267.55%−0.19
27 Feb 20267.74%−0.57
13 Feb 20268.31%+0.25
30 Jan 20268.06%+0.79
15 Jan 20267.27%+0.31
31 Dec 20256.96%+0.28
15 Dec 20256.68%+0.11
28 Nov 20256.57%+0.56
14 Nov 20256.01%+2.20
31 Oct 20253.81%−0.13
15 Oct 20253.94%−0.44
30 Sep 20254.38%−0.04
15 Sep 20254.42%+0.09
29 Aug 20254.33%+0.15
15 Aug 20254.18%−0.01
31 Jul 20254.19%−0.78
15 Jul 20254.97%−1.69
30 Jun 20256.66%−5.12
13 Jun 202511.78%+2.81
30 May 20258.97%−1.24
15 May 202510.21%+2.00
30 Apr 20258.21%−1.98
15 Apr 202510.19%−0.44
31 Mar 202510.63%+1.14
14 Mar 20259.49%−1.80
28 Feb 202511.29%+1.45
14 Feb 20259.84%+0.06
31 Jan 20259.78%−2.15
15 Jan 202511.93%+1.40
31 Dec 202410.53%−0.29
13 Dec 202410.82%+1.30
29 Nov 20249.52%+1.33
15 Nov 20248.19%−2.81
31 Oct 202411.00%−1.74
15 Oct 202412.74%−0.18
30 Sep 202412.92%+0.05
13 Sep 202412.87%+0.27
30 Aug 202412.60%−0.15
15 Aug 202412.75%−1.01
31 Jul 202413.76%+0.88
15 Jul 202412.88%+1.54
28 Jun 202411.34%−2.25
14 Jun 202413.59%+0.85
31 May 202412.74%+1.13
15 May 202411.61%−0.17
30 Apr 202411.78%−0.78
15 Apr 202412.56%+1.26
28 Mar 202411.30%+0.15
15 Mar 202411.15%+0.53
29 Feb 202410.62%−0.34
15 Feb 202410.96%−0.49
31 Jan 202411.45%+0.30
12 Jan 202411.15%+0.25
29 Dec 202310.90%−0.35
15 Dec 202311.25%+0.06
30 Nov 202311.19%+1.07
15 Nov 202310.12%−0.96
31 Oct 202311.08%+2.18
13 Oct 20238.90%−3.62
29 Sep 202312.52%+3.22
15 Sep 20239.30%+1.61
31 Aug 20237.69%−0.06
15 Aug 20237.75%−4.14
31 Jul 202311.89%−1.48
14 Jul 202313.37%+3.22
30 Jun 202310.15%−2.22
15 Jun 202312.37%−0.54
31 May 202312.91%+0.68
15 May 202312.23%+1.03
28 Apr 202311.20%+2.02
14 Apr 20239.18%+0.66
31 Mar 20238.52%+0.84
15 Mar 20237.68%+0.66
28 Feb 20237.02%−0.40
15 Feb 20237.42%+0.26
31 Jan 20237.16%0.00
13 Jan 20237.16%+0.92
30 Dec 20226.24%+0.59
15 Dec 20225.65%+0.17
30 Nov 20225.48%+0.10
15 Nov 20225.38%−0.57
31 Oct 20225.95%−0.58
14 Oct 20226.53%−0.10
30 Sep 20226.63%+1.90
15 Sep 20224.73%+0.62
31 Aug 20224.11%−0.69
15 Aug 20224.80%−1.57
29 Jul 20226.37%+0.36
15 Jul 20226.01%0.00
30 Jun 20226.01%+0.45
15 Jun 20225.56%+0.03
31 May 20225.53%+1.39
13 May 20224.14%+0.30
29 Apr 20223.84%−0.11
14 Apr 20223.95%+0.06
31 Mar 20223.89%+1.33
15 Mar 20222.56%−2.91
28 Feb 20225.47%+0.39
15 Feb 20225.08%+0.07
31 Jan 20225.01%+0.84
14 Jan 20224.17%−0.23
31 Dec 20214.40%+0.60
15 Dec 20213.80%+0.59
30 Nov 20213.21%+0.64
15 Nov 20212.57%+0.64
29 Oct 20211.93%−0.21
15 Oct 20212.14%–

Newest first. Scroll inside the table for earlier dates, back to 15 Oct 2021.

Frequently asked questions

How shorted is Caribou Biosciences, Inc. right now?
12.11% of Caribou Biosciences, Inc.'s (CRBU) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 484th most shorted US stock, out of 3,805 we rank.
What does this number include?
FINRA member firms must report their short positions in all US equities twice a month; FINRA consolidates them per security. We divide that official share count by the company's shares outstanding from its SEC filings. This is the regulatory figure, not a daily estimate.
Why does it only update twice a month?
US short interest is reported for settlement on the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. That cadence is set by regulation; no daily official figure exists.
Is this CRBU's short float?
No. This is short interest as a percentage of shares outstanding, the count in the company's SEC filings. "Short float" divides the same FINRA short count by the public float, which excludes closely held shares, so it comes out higher for the same company. We publish no float estimates: the float is not a regulatory figure.
What is CRBU's days to cover?
9.49 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume. It is published in the same FINRA file and shown verbatim; we hold no volume data ourselves.
Which funds are short?
US public short interest is aggregate-only: individual short sellers are not named. Only some EU markets publish named positions.