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HowShorted

How shorted is Cartesian Therapeutics, Inc.? RNAC

#1,390most shorted US stockof 3,805 ranked stocks, more shorted than 63%

5.96%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.03
5 reports (~10 weeks)
−0.46
days to cover
17.00
Aggregate net short position time series for Cartesian Therapeutics, 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 Cartesian Therapeutics, 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
6 Aug 20266.09% 31 Jul 20266.17% 14 Aug 2026+0.08
30 Apr 20268.51% 15 Apr 20267.54% 15 May 2026−0.97
9 Mar 20268.26% 27 Feb 20268.15% 13 Mar 2026−0.11
6 Nov 20258.19% 31 Oct 20257.81% 14 Nov 2025−0.38
7 Aug 20259.41% 31 Jul 20259.11% 15 Aug 2025−0.30
8 May 20259.76% 30 Apr 20259.66% 15 May 2025−0.10
13 Mar 20258.27% 28 Feb 20257.99% 14 Mar 2025−0.28
7 Nov 20249.02% 31 Oct 20247.32% 15 Nov 2024−1.70

Fails to deliver

The SEC's fails-to-deliver figure for RNAC: 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
5,411
14 Sep 2026
Highest in window
50,583
1 Oct 2025
Days with a balance
60
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Cartesian Therapeutics, 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 51K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20265.96%−0.03
31 Aug 20265.99%−0.18
14 Aug 20266.17%+0.08
31 Jul 20266.09%−0.46
15 Jul 20266.55%+0.13
30 Jun 20266.42%−0.14
15 Jun 20266.56%−1.24
29 May 20267.80%+0.26
15 May 20267.54%+0.16
30 Apr 20267.38%−1.13
15 Apr 20268.51%+0.16
31 Mar 20268.35%+0.20
13 Mar 20268.15%−0.11
27 Feb 20268.26%−0.26
13 Feb 20268.52%+0.21
30 Jan 20268.31%+0.12
15 Jan 20268.19%−0.80
31 Dec 20258.99%−0.02
15 Dec 20259.01%+1.01
28 Nov 20258.00%+0.19
14 Nov 20257.81%−0.38
31 Oct 20258.19%+0.02
15 Oct 20258.17%−0.46
30 Sep 20258.63%−0.34
15 Sep 20258.97%−0.12
29 Aug 20259.09%−0.02
15 Aug 20259.11%−0.30
31 Jul 20259.41%−0.60
15 Jul 202510.01%+0.14
30 Jun 20259.87%−0.25
13 Jun 202510.12%+0.29
30 May 20259.83%+0.17
15 May 20259.66%−0.10
30 Apr 20259.76%+0.38
15 Apr 20259.38%+1.13
31 Mar 20258.25%+0.26
14 Mar 20257.99%−0.28
28 Feb 20258.27%+0.31
14 Feb 20257.96%+0.21
31 Jan 20257.75%−0.15
15 Jan 20257.90%+0.01
31 Dec 20247.89%+0.82
13 Dec 20247.07%−0.13
29 Nov 20247.20%−0.12
15 Nov 20247.32%−1.70
31 Oct 20249.02%−0.08
15 Oct 20249.10%−0.52
30 Sep 20249.62%+0.04
13 Sep 20249.58%+0.17
30 Aug 20249.41%0.00
15 Aug 20249.41%+3.98
28 Mar 20245.43%+0.30
15 Mar 20245.13%+0.93
29 Feb 20244.20%+0.23
15 Feb 20243.97%+0.09
31 Jan 20243.88%+0.19
12 Jan 20243.69%−1.51
31 Oct 20235.20%−0.71
13 Oct 20235.91%−0.26
29 Sep 20236.17%−0.01
15 Sep 20236.18%−0.22
31 Aug 20236.40%−0.73
15 Aug 20237.13%−0.17
31 Jul 20237.30%−0.13
14 Jul 20237.43%+0.11
30 Jun 20237.32%+1.53
15 Jun 20235.79%+0.66
31 May 20235.13%+0.62
15 May 20234.51%−0.14
28 Apr 20234.65%+0.23
14 Apr 20234.42%−0.03
31 Mar 20234.45%+0.59
15 Mar 20233.86%+0.15
28 Feb 20233.71%+0.22
15 Feb 20233.49%−0.03
31 Jan 20233.52%−0.41
13 Jan 20233.93%+0.04
30 Dec 20223.89%−0.08
15 Dec 20223.97%+0.09
30 Nov 20223.88%−0.45
15 Nov 20224.33%−0.69
31 Oct 20225.02%−0.09
14 Oct 20225.11%+0.56
30 Sep 20224.55%+0.68
15 Sep 20223.87%+0.13
31 Aug 20223.74%+0.61
15 Aug 20223.13%−0.83
29 Jul 20223.96%−0.23
15 Jul 20224.19%+0.24
30 Jun 20223.95%−1.73
15 Jun 20225.68%+0.56
31 May 20225.12%−0.70
13 May 20225.82%+0.18
29 Apr 20225.64%−0.84
14 Apr 20226.48%−0.11
31 Mar 20226.59%−0.36
15 Mar 20226.95%+0.31
28 Feb 20226.64%+0.28
15 Feb 20226.36%+0.02
31 Jan 20226.34%+0.06
14 Jan 20226.28%+1.38
31 Dec 20214.90%−1.03
15 Dec 20215.93%+0.24
30 Nov 20215.69%−0.22
15 Nov 20215.91%−0.46
29 Oct 20216.37%+0.02
15 Oct 20216.35%+0.01
30 Sep 20216.34%+0.56
15 Sep 20215.78%−0.25
31 Aug 20216.03%+0.34
13 Aug 20215.69%−0.44
30 Jul 20216.13%+0.02
15 Jul 20216.11%−0.31
30 Jun 20216.42%+0.22
15 Jun 20216.20%−0.72
28 May 20216.92%+0.93
14 May 20215.99%−0.86
30 Apr 20216.85%+0.79
15 Apr 20216.06%+0.12
31 Mar 20215.94%−0.06
15 Mar 20216.00%−0.42
26 Feb 20216.42%+0.46
12 Feb 20215.96%−0.32
29 Jan 20216.28%+0.61
15 Jan 20215.67%+0.67
31 Dec 20205.00%−2.66
15 Dec 20207.66%−0.25
30 Nov 20207.91%−1.05
13 Nov 20208.96%−0.83
30 Oct 20209.79%+1.44
15 Oct 20208.35%+0.27
30 Sep 20208.08%+0.34
15 Sep 20207.74%−0.47
31 Aug 20208.21%−0.35
14 Aug 20208.56%−0.19
31 Jul 20208.75%−2.25
15 Jul 202011.00%−0.92
30 Jun 202011.92%+3.72
15 Jun 20208.20%+0.88
29 May 20207.32%−0.61
15 May 20207.93%−0.04
30 Apr 20207.97%+0.18
15 Apr 20207.79%+1.40
31 Mar 20206.39%+3.81
13 Mar 20202.58%−1.05
28 Feb 20203.63%+0.60
14 Feb 20203.03%+1.37
31 Jan 20201.66%+0.36
15 Jan 20201.30%+0.16
31 Dec 20191.14%−0.55
13 Dec 20191.69%−0.23
29 Nov 20191.92%−0.06
15 Nov 20191.98%+0.57
31 Oct 20191.41%−0.13
15 Oct 20191.54%–

Newest first. Scroll inside the table for earlier dates, back to 15 Oct 2019.

Frequently asked questions

How shorted is Cartesian Therapeutics, Inc. right now?
5.96% of Cartesian Therapeutics, Inc.'s (RNAC) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,390th 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 RNAC'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 RNAC's days to cover?
17.00 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.