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HowShorted

CTSO short interest Nasdaq Capital Market

Cytosorbents Corporation Commo. 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
120,606
vs previous settlement
โˆ’2,185,590 (-94.8%)
days to cover
2.65
Settlement date
15 Sep 2026

Shares short over time

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

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 Corporation Commo 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.

History

Every FINRA settlement we hold for CTSO, newest first. สณ marks a figure FINRA itself flagged as revised.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 2026120,606โˆ’2,185,5902.65
31 Aug 20262,306,196+148,09718.30
14 Aug 20262,158,099+15,57629.87
31 Jul 20262,142,523+23,74338.34
15 Jul 20262,118,780+39,87826.86
30 Jun 20262,078,902โˆ’8,6556.23
15 Jun 20262,087,557+15,8447.90
29 May 20262,071,713+14,61918.52
15 May 20262,057,094+14,60020.60
30 Apr 20262,042,494โˆ’1,82447.19
15 Apr 20262,044,318+23,63824.34
31 Mar 20262,020,680+2,02015.02
13 Mar 20262,018,660+17,84827.61
27 Feb 20262,000,812โˆ’38,42239.14
13 Feb 20262,039,234+2,77126.32
30 Jan 20262,036,463+50,56825.80
15 Jan 20261,985,895โˆ’16,73928.85
31 Dec 20252,002,634+6,67713.24
15 Dec 20251,995,957โˆ’17,34216.43
28 Nov 20252,013,299+61,27116.23
14 Nov 20251,952,028+385,85413.66
31 Oct 20251,566,174+248,91519.78
15 Oct 20251,317,259โˆ’24,76718.48
30 Sep 20251,342,026โˆ’6,55215.53
15 Sep 20251,348,578โˆ’38,59723.05
29 Aug 20251,387,175โˆ’102,5997.45
15 Aug 20251,489,774+122,4092.85
31 Jul 20251,367,365โˆ’71,57920.01
15 Jul 20251,438,944โˆ’42,91811.09
30 Jun 20251,481,862+48,42310.48
13 Jun 20251,433,439โˆ’30,34419.25
30 May 20251,463,783โˆ’21,28215.62
15 May 20251,485,065โˆ’19,9897.59
30 Apr 20251,505,054โˆ’119,93121.97
15 Apr 20251,624,985โˆ’120,62121.27
31 Mar 20251,745,606โˆ’96,41324.66
14 Mar 20251,842,019โˆ’8,01717.83
28 Feb 20251,850,036โˆ’100,54614.65
14 Feb 20251,950,582+16,19710.95
31 Jan 20251,934,385+101,24624.10
15 Jan 20251,833,139+385,5291.84
31 Dec 20241,447,610+50,1998.15
13 Dec 20241,397,411+27,9379.05
29 Nov 20241,369,474+70,52713.22
15 Nov 20241,298,947โˆ’56,8136.65
31 Oct 20241,355,760+7,05713.97
15 Oct 20241,348,703+23,14512.89
30 Sep 20241,325,558โˆ’86,4759.52
13 Sep 20241,412,033+19,25225.71
30 Aug 20241,392,781+48532.97
15 Aug 20241,392,296โˆ’24,42214.11
31 Jul 20241,416,718โˆ’36,21714.68
15 Jul 20241,452,935โˆ’24,8337.62
28 Jun 20241,477,768+7,07412.85
14 Jun 20241,470,694โˆ’53,60221.80
31 May 20241,524,296+62,27718.33
15 May 20241,462,019โˆ’89,17812.50
30 Apr 20241,551,197+24216.37
15 Apr 20241,550,955โˆ’68,27317.34
28 Mar 20241,619,228โˆ’50,85118.14
15 Mar 20241,670,079โˆ’45,72914.66
29 Feb 20241,715,808โˆ’38,10214.50
15 Feb 20241,753,910โˆ’46,10619.35
31 Jan 20241,800,016โˆ’367,8246.97
12 Jan 20242,167,840+152,4685.86
29 Dec 20232,015,372+157,9921.88
15 Dec 20231,857,380โˆ’14,1185.16
30 Nov 20231,871,498+187,38014.08
15 Nov 20231,684,118+57,31914.24
31 Oct 20231,626,799+8,08121.30
13 Oct 20231,618,718+284,59016.84
29 Sep 20231,334,128+109,56622.25
15 Sep 20231,224,562+205,16814.48
31 Aug 20231,019,394+111,66824.74
15 Aug 2023907,726+130,38313.30
31 Jul 2023777,343โˆ’4216.07
14 Jul 2023777,385โˆ’88,6746.43
30 Jun 2023866,059+14,60128.77
15 Jun 2023851,458+40,57417.14
31 May 2023810,884+10,25013.13
15 May 2023800,634+131,5519.49
28 Apr 2023669,083+82,9038.88
14 Apr 2023586,180โˆ’57,83813.15
31 Mar 2023644,018โˆ’68,89714.11
15 Mar 2023712,915+46,0916.81
28 Feb 2023666,824+9,2219.65
15 Feb 2023657,603โˆ’7,6973.54
31 Jan 2023665,300+122,2847.03
13 Jan 2023543,016+18,0324.79
30 Dec 2022524,984โˆ’100,8852.33
15 Dec 2022625,869โˆ’71,6555.96
30 Nov 2022697,524+18,5509.34
15 Nov 2022678,974+168,7401.37
31 Oct 2022510,234โˆ’13,6557.29
14 Oct 2022523,889โˆ’60,4606.67
30 Sep 2022584,349โˆ’180,8003.76
15 Sep 2022765,149+39,6206.26
31 Aug 2022725,529+31,4553.00
15 Aug 2022694,074โˆ’18,3955.12
29 Jul 2022712,469โˆ’50,02312.69
15 Jul 2022762,492โˆ’101,8036.30
30 Jun 2022864,295โˆ’1,052,8231.23
15 Jun 20221,917,118โˆ’19,3946.95
31 May 20221,936,512โˆ’468,5929.46
13 May 20222,405,104+357,0397.43
29 Apr 20222,048,065+435,9427.72
14 Apr 20221,612,123โˆ’217,8119.68
31 Mar 20221,829,934+9,65411.69
15 Mar 20221,820,280+278,9579.72
28 Feb 20221,541,323+149,12012.38
15 Feb 20221,392,203+127,1598.98
31 Jan 20221,265,044โˆ’85,1783.92
14 Jan 20221,350,222+55,1226.29
31 Dec 20211,295,100โˆ’76,7983.68
15 Dec 20211,371,898+29,6267.39
30 Nov 20211,342,272โˆ’18,9645.17
15 Nov 20211,361,236+40,5756.01
29 Oct 20211,320,661โˆ’198,8835.38
15 Oct 20211,519,544โˆ’384,0223.86
30 Sep 20211,903,566โˆ’45,1629.75
15 Sep 20211,948,728โˆ’6,7987.48
31 Aug 20211,955,526+14,2798.97
13 Aug 20211,941,247โˆ’202,1364.52
30 Jul 20212,143,383โˆ’58,34014.91
15 Jul 20212,201,723+339,1944.92
30 Jun 20211,862,529โˆ’251,6106.87
15 Jun 20212,114,139สณ+34,47711.72
28 May 20212,079,662โˆ’159,51217.87
14 May 20212,239,174+6,3297.96
30 Apr 20212,232,845+138,45810.37
15 Apr 20212,094,387+17,74512.02
31 Mar 20212,076,642โˆ’400,8517.37
15 Mar 20212,477,493+44,5109.47
26 Feb 20212,432,983โˆ’10,8439.27
12 Feb 20212,443,826โˆ’478,7527.66
29 Jan 20212,922,578+10,9788.88
15 Jan 20212,911,600โˆ’104,1128.28
31 Dec 20203,015,712โˆ’86,23014.06
15 Dec 20203,101,942+111,71012.14
30 Nov 20202,990,232โˆ’47,71215.07
13 Nov 20203,037,944+50,92110.05
30 Oct 20202,987,023+123,69615.50
15 Oct 20202,863,327โˆ’129,25812.65
30 Sep 20202,992,585+95,1168.74
15 Sep 20202,897,469+44,1389.21
31 Aug 20202,853,331โˆ’70,3028.83
14 Aug 20202,923,633+226,3695.78
31 Jul 20202,697,264โˆ’107,3473.14
15 Jul 20202,804,611โˆ’242,7127.13
30 Jun 20203,047,323+215,5916.50
15 Jun 20202,831,732+89,9295.91
29 May 20202,741,803+81,3425.21
15 May 20202,660,461สณโˆ’390,0823.86
30 Apr 20203,050,543โˆ’314,3933.62
15 Apr 20203,364,936+272,4532.59
31 Mar 20203,092,483โˆ’92,2493.10
13 Mar 20203,184,732+360,8033.71
28 Feb 20202,823,929+116,1112.91
14 Feb 20202,707,818+6,99610.96
31 Jan 20202,700,822+187,9148.46
15 Jan 20202,512,908+22,47717.13
31 Dec 20192,490,431+6,60215.72
13 Dec 20192,483,829+162,97412.04
29 Nov 20192,320,855โˆ’147,66211.42
15 Nov 20192,468,517โˆ’246,85312.94
31 Oct 20192,715,370+98,02729.61
15 Oct 20192,617,343+68,04117.03
30 Sep 20192,549,302โˆ’54,55119.19
13 Sep 20192,603,853โˆ’91,12318.88
30 Aug 20192,694,976โˆ’167,94515.21
15 Aug 20192,862,921+264,8317.57
31 Jul 20192,598,090+60726.14
15 Jul 20192,597,483+53,50923.33
28 Jun 20192,543,974+13,67023.16
14 Jun 20192,530,304+35,49224.39
31 May 20192,494,812+88,05024.31
15 May 20192,406,762โˆ’38,63013.84
30 Apr 20192,445,392โˆ’135,39223.84
15 Apr 20192,580,784+99,60724.49
29 Mar 20192,481,177โˆ’30,70621.70
15 Mar 20192,511,883โˆ’67,75014.06
28 Feb 20192,579,633+11,63327.54
15 Feb 20192,568,000+16,04820.82
31 Jan 20192,551,952โˆ’7,07012.11
15 Jan 20192,559,022+70,61112.35
31 Dec 20182,488,411โˆ’54,3319.92
14 Dec 20182,542,742+26,25915.38
30 Nov 20182,516,483โˆ’82,44917.47
15 Nov 20182,598,932+107,86310.34
31 Oct 20182,491,069โˆ’77,61913.01
15 Oct 20182,568,688โˆ’9,35912.33
28 Sep 20182,578,047+244,62013.42
14 Sep 20182,333,427โˆ’23,58210.51
31 Aug 20182,357,009+1,6929.46
15 Aug 20182,355,317โˆ’50,1267.97
31 Jul 20182,405,443โˆ’149,76011.93
13 Jul 20182,555,203โˆ’112,61012.73
29 Jun 20182,667,813+1,087,4834.05
15 Jun 20181,580,330+128,6375.42
31 May 20181,451,693โˆ’426,4053.07
15 May 20181,878,098+139,3998.31
30 Apr 20181,738,699+28,9989.98
13 Apr 20181,709,701+200,58712.02
29 Mar 20181,509,114+26,1598.33
15 Mar 20181,482,955โˆ’20,0017.09
28 Feb 20181,502,956+20,7934.39
15 Feb 20181,482,163+154,9098.82
31 Jan 20181,327,254+16,61313.58
12 Jan 20181,310,641โˆ’48,4557.48
29 Dec 20171,359,096โ€“12.82

Scroll inside the table for earlier settlements, back to 29 Dec 2017.

Questions

Frequently asked questions

What is CTSO's short interest?
120,606 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, down 2,185,590 from the previous settlement.
Why is there no percentage for CTSO?
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 CTSO's days to cover?
2.65 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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