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HowShorted

How shorted is Cabaletta Bio, Inc.? CABA

#132most shorted US stockof 3,805 ranked stocks, more shorted than 96%

19.66%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−4.78
5 reports (~10 weeks)
−10.94
days to cover
5.20
Aggregate net short position time series for Cabaletta Bio, 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 Cabaletta Bio, 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 202636.63% 31 Jul 202625.24% 14 Aug 2026−11.39
14 May 202618.53% 30 Apr 202620.52% 15 May 2026+1.99
4 May 202618.53% 30 Apr 202620.52% 15 May 2026+1.99
23 Mar 202619.78% 13 Mar 202617.94% 31 Mar 2026−1.84
10 Nov 202513.45% 31 Oct 202516.82% 14 Nov 2025+3.37
7 Aug 202511.87% 31 Jul 20256.90% 15 Aug 2025−4.97
15 May 202512.02% 30 Apr 202512.21% 30 May 2025+0.19
31 Mar 202512.74% 14 Mar 202511.43% 15 Apr 2025−1.31

Fails to deliver

The SEC's fails-to-deliver figure for CABA: 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
8
3 Sep 2026
Highest in window
2,158,953
29 Jun 2026
Days with a balance
77
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Cabaletta Bio, 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 2.2M shares.

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Sector: Healthcare · By year: 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202619.66%−4.78
31 Aug 202624.44%−0.80
14 Aug 202625.24%−11.39
31 Jul 202636.63%−0.21
15 Jul 202636.84%+6.24
30 Jun 202630.60%+7.03
15 Jun 202623.57%+2.96
29 May 202620.61%+0.09
15 May 202620.52%+1.99
30 Apr 202618.53%+0.89
15 Apr 202617.64%−0.30
31 Mar 202617.94%−1.84
13 Mar 202619.78%+0.42
27 Feb 202619.36%+0.01
13 Feb 202619.35%−0.05
30 Jan 202619.40%+0.25
15 Jan 202619.15%−0.37
31 Dec 202519.52%−0.16
15 Dec 202519.68%+0.86
28 Nov 202518.82%+2.00
14 Nov 202516.82%+3.37
31 Oct 202513.45%+1.18
15 Oct 202512.27%+5.66
30 Sep 20256.61%+0.52
15 Sep 20256.09%−0.28
29 Aug 20256.37%−0.53
15 Aug 20256.90%−4.97
31 Jul 202511.87%−1.01
15 Jul 202512.88%+1.83
30 Jun 202511.05%−1.69
13 Jun 202512.74%+0.53
30 May 202512.21%+1.32
15 May 202510.89%−1.13
30 Apr 202512.02%+0.59
15 Apr 202511.43%−0.65
31 Mar 202512.08%−0.66
14 Mar 202512.74%−1.09
28 Feb 202513.83%+1.14
14 Feb 202512.69%−0.10
31 Jan 202512.79%−0.41
15 Jan 202513.20%+0.88
31 Dec 202412.32%−0.42
13 Dec 202412.74%+3.52
29 Nov 20249.22%+1.86
15 Nov 20247.36%−0.23
31 Oct 20247.59%−0.15
15 Oct 20247.74%−3.16
30 Sep 202410.90%−2.19
13 Sep 202413.09%+0.01
30 Aug 202413.08%+0.22
15 Aug 202412.86%−5.33
31 Jul 202418.19%+2.62
15 Jul 202415.57%+0.70
28 Jun 202414.87%−4.72
14 Jun 202419.59%−0.04
31 May 202419.63%+0.76
15 May 202418.87%−2.38
30 Apr 202421.25%+0.78
15 Apr 202420.47%+2.85
28 Mar 202417.62%+2.92
15 Mar 202414.70%−1.66
29 Feb 202416.36%+0.42
15 Feb 202415.94%+1.03
31 Jan 202414.91%−0.07
12 Jan 202414.98%+0.47
29 Dec 202314.51%+1.36
15 Dec 202313.15%−0.09
30 Nov 202313.24%+1.44
15 Nov 202311.80%−3.99
31 Oct 202315.79%+0.24
13 Oct 202315.55%+2.52
29 Sep 202313.03%+5.15
15 Sep 20237.88%−0.30
31 Aug 20238.18%−5.29
15 Aug 202313.47%−2.64
31 Jul 202316.11%−1.48
14 Jul 202317.59%+0.80
30 Jun 202316.79%+3.07
15 Jun 202313.72%+0.91
31 May 202312.81%+0.11
15 May 202312.70%−0.06
28 Apr 202312.76%−0.13
14 Apr 202312.89%+1.14
31 Mar 202311.75%+0.37
15 Mar 202311.38%−0.61
28 Feb 202311.99%+0.33
15 Feb 202311.66%−0.01
31 Jan 202311.67%+0.40
13 Jan 202311.27%−0.89
30 Dec 202212.16%−0.05
15 Dec 202212.21%−0.43
30 Nov 202212.64%+0.74
15 Nov 202211.90%−1.09
31 Oct 202212.99%+0.71
14 Oct 202212.28%−3.80
30 Sep 202216.08%+1.72
15 Sep 202214.36%+2.51
31 Aug 202211.85%+4.19
15 Aug 20227.66%+0.58
29 Jul 20227.08%+0.33
15 Jul 20226.75%+0.39
30 Jun 20226.36%+0.03
15 Jun 20226.33%+0.12
31 May 20226.21%−0.09
13 May 20226.30%+0.16
29 Apr 20226.14%+0.01
14 Apr 20226.13%−0.15
31 Mar 20226.28%0.00
15 Mar 20226.28%+0.02
28 Feb 20226.26%+0.02
15 Feb 20226.24%−0.04
31 Jan 20226.28%−0.08
14 Jan 20226.36%−0.07
31 Dec 20216.43%−0.06
15 Dec 20216.49%+0.06
30 Nov 20216.43%+0.62
15 Nov 20215.81%+1.04
29 Oct 20214.77%−0.65
15 Oct 20215.42%+0.01
30 Sep 20215.41%+0.05
15 Sep 20215.36%+0.06
31 Aug 20215.30%+0.07
13 Aug 20215.23%−0.09
30 Jul 20215.32%−0.31
15 Jul 20215.63%−0.04
30 Jun 20215.67%−0.78
15 Jun 20216.45%+0.10
28 May 20216.35%−0.40
14 May 20216.75%−0.34
30 Apr 20217.09%+0.05
15 Apr 20217.04%−0.21
31 Mar 20217.25%+0.12
15 Mar 20217.13%+0.36
26 Feb 20216.77%+0.08
12 Feb 20216.69%+0.29
29 Jan 20216.40%+0.30
15 Jan 20216.10%+0.15
31 Dec 20205.95%+0.30
15 Dec 20205.65%+0.26
30 Nov 20205.39%+0.36
13 Nov 20205.03%+0.05
30 Oct 20204.98%+0.13
15 Oct 20204.85%+0.31
30 Sep 20204.54%+0.46
15 Sep 20204.08%+0.17
31 Aug 20203.91%+0.15
14 Aug 20203.76%−1.03
31 Jul 20204.79%+3.64
15 Jun 20201.15%+0.65
29 May 20200.50%+0.09
15 May 20200.41%−0.09
30 Apr 20200.50%+0.16
15 Apr 20200.34%–

Newest first. Scroll inside the table for earlier dates, back to 15 Apr 2020.

Frequently asked questions

How shorted is Cabaletta Bio, Inc. right now?
19.66% of Cabaletta Bio, Inc.'s (CABA) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 132nd 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 CABA'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 CABA's days to cover?
5.20 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.