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HowShorted

How shorted is Cytosorbents Corp? CTSO

3.67%
of shares outstanding reported short · settlement date 31 Aug 2026
vs previous report
+0.24
5 reports (~10 weeks)
+0.34
days to cover
18.30
Aggregate net short position time series for Cytosorbents Corp

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 Cytosorbents Corp 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 20263.41% 31 Jul 20263.43% 14 Aug 2026+0.02
13 May 20263.26% 30 Apr 20263.28% 15 May 2026+0.02
25 Mar 20263.21% 13 Mar 20263.22% 31 Mar 2026+0.01
13 Nov 20252.50% 31 Oct 20253.11% 14 Nov 2025+0.61
14 May 20252.41% 30 Apr 20252.38% 15 May 2025−0.03
31 Mar 20253.37% 14 Mar 20252.60% 15 Apr 2025−0.77
21 Mar 20253.37% 14 Mar 20252.79% 31 Mar 2025−0.58
4 Mar 20253.38% 28 Feb 20253.37% 14 Mar 2025−0.01

Fails to deliver

The SEC's fails-to-deliver figure for CTSO: 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
4,859
14 Sep 2026
Highest in window
143,939
12 Nov 2025
Days with a balance
54
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Cytosorbents Corp 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 144K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
31 Aug 20263.67%+0.24
14 Aug 20263.43%+0.02
31 Jul 20263.41%+0.03
15 Jul 20263.38%+0.06
30 Jun 20263.32%−0.01
15 Jun 20263.33%+0.03
29 May 20263.30%+0.02
15 May 20263.28%+0.02
30 Apr 20263.26%0.00
15 Apr 20263.26%+0.04
31 Mar 20263.22%+0.01
13 Mar 20263.21%+0.02
27 Feb 20263.19%−0.06
13 Feb 20263.25%+0.01
30 Jan 20263.24%+0.08
15 Jan 20263.16%−0.03
31 Dec 20253.19%+0.01
15 Dec 20253.18%−0.03
28 Nov 20253.21%+0.10
14 Nov 20253.11%+0.61
31 Oct 20252.50%+0.40
15 Oct 20252.10%−0.04
30 Sep 20252.14%−0.01
15 Sep 20252.15%−0.06
29 Aug 20252.21%−0.16
15 Aug 20252.37%+0.18
31 Jul 20252.19%−0.11
15 Jul 20252.30%−0.07
30 Jun 20252.37%+0.08
13 Jun 20252.29%−0.05
30 May 20252.34%−0.04
15 May 20252.38%−0.03
30 Apr 20252.41%−0.19
15 Apr 20252.60%−0.19
31 Mar 20252.79%−0.58
14 Mar 20253.37%−0.01
28 Feb 20253.38%−0.19
14 Feb 20253.57%+0.03
31 Jan 20253.54%+0.19
15 Jan 20253.35%+0.70
31 Dec 20242.65%+0.09
13 Dec 20242.56%+0.06
29 Nov 20242.50%+0.12
15 Nov 20242.38%−0.11
31 Oct 20242.49%+0.01
15 Oct 20242.48%+0.04
30 Sep 20242.44%−0.15
13 Sep 20242.59%+0.03
30 Aug 20242.56%0.00
15 Aug 20242.56%−0.05
31 Jul 20242.61%−0.07
15 Jul 20242.68%−0.04
28 Jun 20242.72%+0.01
14 Jun 20242.71%−0.10
31 May 20242.81%+0.12
15 May 20242.69%−0.17
30 Apr 20242.86%0.00
15 Apr 20242.86%−0.12
28 Mar 20242.98%−0.10
15 Mar 20243.08%−0.78
29 Feb 20243.86%−0.09
15 Feb 20243.95%−0.10
31 Jan 20244.05%−0.83
12 Jan 20244.88%+0.34
29 Dec 20234.54%+0.36
15 Dec 20234.18%−0.03
30 Nov 20234.21%+0.42
15 Nov 20233.79%+0.12
31 Oct 20233.67%+0.02
13 Oct 20233.65%+0.64
29 Sep 20233.01%+0.25
15 Sep 20232.76%+0.46
31 Aug 20232.30%+0.25
15 Aug 20232.05%+0.27
31 Jul 20231.78%0.00
14 Jul 20231.78%−0.20
30 Jun 20231.98%+0.03
15 Jun 20231.95%+0.09
31 May 20231.86%+0.03
15 May 20231.83%+0.30
28 Apr 20231.53%+0.19
14 Apr 20231.34%−0.13
31 Mar 20231.47%−0.16
15 Mar 20231.63%+0.10
28 Feb 20231.53%+0.02
15 Feb 20231.51%−0.01
31 Jan 20231.52%+0.28
13 Jan 20231.24%+0.04
30 Dec 20221.20%−0.23
15 Dec 20221.43%−0.17
30 Nov 20221.60%+0.04
15 Nov 20221.56%+0.39
31 Oct 20221.17%−0.03
14 Oct 20221.20%−0.14
30 Sep 20221.34%−0.42
15 Sep 20221.76%+0.10
31 Aug 20221.66%+0.07
15 Aug 20221.59%−0.05
29 Jul 20221.64%−0.11
15 Jul 20221.75%−0.24
30 Jun 20221.99%−2.42
15 Jun 20224.41%−0.04
31 May 20224.45%−1.08
13 May 20225.53%+0.82
29 Apr 20224.71%+1.00
14 Apr 20223.71%−0.50
31 Mar 20224.21%+0.03
15 Mar 20224.18%+0.63
28 Feb 20223.55%+0.35
15 Feb 20223.20%+0.29
31 Jan 20222.91%−0.20
14 Jan 20223.11%+0.13
31 Dec 20212.98%−0.18
15 Dec 20213.16%+0.07
30 Nov 20213.09%−0.04
15 Nov 20213.13%+0.08
29 Oct 20213.05%−0.45
15 Oct 20213.50%−0.89
30 Sep 20214.39%−0.10
15 Sep 20214.49%−0.02
31 Aug 20214.51%+0.03
13 Aug 20214.48%−0.47
30 Jul 20214.95%−0.14
15 Jul 20215.09%+0.78
30 Jun 20214.31%−0.58
15 Jun 20214.89%+0.08
28 May 20214.81%−0.37
14 May 20215.18%+0.02
30 Apr 20215.16%+0.32
15 Apr 20214.84%+0.04
31 Mar 20214.80%−0.93
15 Mar 20215.73%+0.09
26 Feb 20215.64%−0.02
12 Feb 20215.66%−1.11
29 Jan 20216.77%+0.03
15 Jan 20216.74%−0.24
31 Dec 20206.98%−0.20
15 Dec 20207.18%+0.25
30 Nov 20206.93%−0.11
13 Nov 20207.04%+0.12
30 Oct 20206.92%+0.29
15 Oct 20206.63%−0.30
30 Sep 20206.93%+0.22
15 Sep 20206.71%+0.10
31 Aug 20206.61%−0.16
14 Aug 20206.77%+0.52
31 Jul 20206.25%−1.75
15 Jul 20208.00%−0.69
30 Jun 20208.69%+0.61
15 Jun 20208.08%+0.26
29 May 20207.82%+0.23
15 May 20207.59%−1.11
30 Apr 20208.70%−0.90
15 Apr 20209.60%+0.78
31 Mar 20208.82%−0.27
13 Mar 20209.09%+0.38
28 Feb 20208.71%+0.36
14 Feb 20208.35%+0.02
31 Jan 20208.33%+0.58
15 Jan 20207.75%+0.07
31 Dec 20197.68%+0.02
13 Dec 20197.66%+0.50
29 Nov 20197.16%−0.45
15 Nov 20197.61%−0.80
31 Oct 20198.41%+0.31
15 Oct 20198.10%+0.21
30 Sep 20197.89%−0.17
13 Sep 20198.06%−0.28
30 Aug 20198.34%−0.52
15 Aug 20198.86%+0.80
31 Jul 20198.06%+0.01
15 Jul 20198.05%+0.16
28 Jun 20197.89%+0.04
14 Jun 20197.85%+0.11
31 May 20197.74%+0.28
15 May 20197.46%−0.12
30 Apr 20197.58%−0.57
15 Apr 20198.15%+0.31
29 Mar 20197.84%−0.10
15 Mar 20197.94%−0.21
28 Feb 20198.15%+0.04
15 Feb 20198.11%+0.05
31 Jan 20198.06%−0.02
15 Jan 20198.08%+0.22
31 Dec 20187.86%−0.17
14 Dec 20188.03%+0.08
30 Nov 20187.95%−0.26
15 Nov 20188.21%+0.34
31 Oct 20187.87%−0.30
15 Oct 20188.17%−0.02
28 Sep 20188.19%+0.77
14 Sep 20187.42%−0.07
31 Aug 20187.49%0.00
15 Aug 20187.49%−0.16
31 Jul 20187.65%−1.02
13 Jul 20188.67%−0.38
29 Jun 20189.05%+3.69
15 Jun 20185.36%+0.43
31 May 20184.93%−1.44
15 May 20186.37%+0.47
30 Apr 20185.90%+0.10
13 Apr 20185.80%+0.68
29 Mar 20185.12%+0.09
15 Mar 20185.03%−0.07
28 Feb 20185.10%−0.07
15 Feb 20185.17%+0.54
31 Jan 20184.63%+0.06
12 Jan 20184.57%−0.17
29 Dec 20174.74%–

Newest first. Scroll inside the table for earlier dates, back to 29 Dec 2017.

Frequently asked questions

How shorted is Cytosorbents Corp right now?
3.67% of Cytosorbents Corp's (CTSO) shares outstanding were reported short for settlement date 31 Aug 2026, per FINRA's consolidated short interest report.
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 CTSO'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 CTSO's days to cover?
18.30 days for settlement date 31 Aug 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.