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HowShorted

CPST short interest NYSE Arca

Calamos S&P 500 Structured Alt. FINRA's reported shares short for this symbol, twice a month by settlement date, shown as the regulator publishes them. No percentage is shown: exchange-traded product: its share count floats with creation and redemption.

Shares short
3,901
vs previous settlement
โˆ’7,850 (-66.8%)
days to cover
1.00
Settlement date
15 Sep 2026

Shares short over time

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

Fails to deliver

The SEC's fails-to-deliver figure for CPST: 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
1,642
11 Sep 2026
Highest in window
26,017
8 Sep 2026
Days with a balance
38
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Calamos S&P 500 Structured Alt 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 26K shares.

History

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

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 20263,901โˆ’7,8501.00
31 Aug 202611,751+7,5277.60
14 Aug 20264,224+1,8091.83
31 Jul 20262,415โˆ’4971.03
15 Jul 20262,912+6316.17
30 Jun 20262,281โˆ’2,2811.69
15 Jun 20264,562+2,1663.00
29 May 20262,396โˆ’462.51
15 May 20262,442โˆ’1,0941.00
30 Apr 20263,536+1524.28
15 Apr 20263,384+34.56
31 Mar 20263,381โˆ’1294.38
13 Mar 20263,510โˆ’1,6551.00
27 Feb 20265,165โˆ’5752.45
13 Feb 20265,740+5,4621.49
30 Jan 2026278โˆ’2,6201.00
15 Jan 20262,898โˆ’3,5162.15
31 Dec 20256,414โˆ’1,6854.96
15 Dec 20258,099+9833.75
28 Nov 20257,116โˆ’5933.15
14 Nov 20257,709โˆ’1,4633.91
31 Oct 20259,172โˆ’5,1843.63
15 Oct 202514,356+1,4295.62
30 Sep 202512,927โˆ’4432.29
15 Sep 202513,370+12,4531.00
29 Aug 2025917+4681.00
15 Jul 2025449โˆ’531.00
30 Jun 202550201.40
13 Jun 2025502โˆ’1,7081.00
30 May 20252,210โˆ’1,0613.09
15 May 20253,271+6291.34
15 Apr 20252,642+1,8901.00
31 Mar 2025752โˆ’11,8811.13
14 Mar 202512,633+5943.10
28 Feb 202512,039+4,6874.32
14 Feb 20257,352โˆ’1,5554.86
31 Jan 20258,907+4,3674.07
15 Jan 20254,540+8982.19
31 Dec 20243,642+1653.21
13 Dec 20243,477โˆ’2,0492.77
29 Nov 20245,526โˆ’1,5694.43
15 Nov 20247,095โˆ’1212.00
31 Oct 20247,216โˆ’34,69112.31
15 Oct 202441,907+10,7818.88
30 Sep 202431,126โˆ’11,9272.15
13 Sep 202443,053โˆ’486,0201.00
15 Apr 2021529,073+167,2963.16
31 Mar 2021361,777+21,1042.24
15 Mar 2021340,673+32,1981.18
26 Feb 2021308,475+42,1021.00
12 Feb 2021266,373+70,8701.00
29 Jan 2021195,503โˆ’98,6001.00
15 Jan 2021294,103+136,3621.00
31 Dec 2020157,741+47,0681.00
15 Dec 2020110,673โˆ’19,7691.00
30 Nov 2020130,442โˆ’80,5181.00
13 Nov 2020210,960+9,8961.89
30 Oct 2020201,064+124,8572.27
15 Oct 202076,207โˆ’90,5061.00
30 Sep 2020166,713โˆ’1,0751.65
15 Sep 2020167,788+23,9401.21
31 Aug 2020143,848โˆ’26,0401.00
14 Aug 2020169,888โˆ’90,6251.00
31 Jul 2020260,513โˆ’23,3661.48
15 Jul 2020283,879โˆ’20,0631.00
30 Jun 2020303,942โˆ’28,0683.35
15 Jun 2020332,010+32,0581.98
29 May 2020299,952+2,8942.06
15 May 2020297,058+21,7411.04
30 Apr 2020275,317โˆ’16,2011.16
15 Apr 2020291,518โˆ’1,2622.97
31 Mar 2020292,780+48,9001.41
13 Mar 2020243,880โˆ’6,0481.79
28 Feb 2020249,928+9,3511.88
14 Feb 2020240,577โˆ’70,9561.90
31 Jan 2020311,533+14,5973.15
15 Jan 2020296,936+35,4641.61
31 Dec 2019261,472โˆ’74,6602.73
13 Dec 2019336,132+6,0142.13
29 Nov 2019330,118+114,8521.00
15 Nov 2019215,266โˆ’95,5771.38
31 Oct 2019310,843สณโˆ’1,834,8001.00
15 Oct 20192,145,643+221,6019.49
30 Sep 20191,924,042โˆ’303,3294.66
13 Sep 20192,227,371โˆ’99,3383.68
30 Aug 20192,326,709โˆ’441,1987.64
15 Aug 20192,767,907โˆ’54,9919.70
31 Jul 20192,822,898+334,24816.04
15 Jul 20192,488,650โˆ’338,39913.12
28 Jun 20192,827,049+25,21712.35
14 Jun 20192,801,832+32,97110.25
31 May 20192,768,861+55,88715.64
15 May 20192,712,974โˆ’274,31810.14
30 Apr 20192,987,292โˆ’75,2379.68
15 Apr 20193,062,529+17,40511.41
29 Mar 20193,045,124โˆ’57,8048.28
15 Mar 20193,102,928+54,07611.37
28 Feb 20193,048,852+44,1868.67
15 Feb 20193,004,666+210,2416.82
31 Jan 20192,794,425+776,7964.74
15 Jan 20192,017,629โˆ’11,6504.06
31 Dec 20182,029,279+25,7333.25
14 Dec 20182,003,546+4645.02
30 Nov 20182,003,082โˆ’24,0694.69
15 Nov 20182,027,151โˆ’66,8374.74
31 Oct 20182,093,988+142,1636.14
15 Oct 20181,951,825+45,2934.75
28 Sep 20181,906,532โˆ’462,3273.21
14 Sep 20182,368,859+113,1003.57
31 Aug 20182,255,759โˆ’395,6603.80
15 Aug 20182,651,419+983,6653.28
31 Jul 20181,667,754+214,0112.73
13 Jul 20181,453,743โˆ’90,5505.65
29 Jun 20181,544,293+237,9873.32
15 Jun 20181,306,306+393,7271.10
31 May 2018912,579โˆ’73,2941.00
15 May 2018985,873โˆ’784,3971.64
30 Apr 20181,770,270โˆ’2,270,1681.52
13 Apr 20184,040,438โˆ’153,9532.14
29 Mar 20184,194,391+165,5353.47
15 Mar 20184,028,856โˆ’158,0004.40
28 Feb 20184,186,856โˆ’32,4546.11
15 Feb 20184,219,310โˆ’248,9723.14
31 Jan 20184,468,282+233,4278.18
12 Jan 20184,234,855โˆ’4,7094.10
29 Dec 20174,239,564โ€“4.92

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

Questions

Frequently asked questions

What is CPST's short interest?
3,901 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, down 7,850 from the previous settlement.
Why is there no percentage for CPST?
Because no defensible share count exists to divide by: exchange-traded product: its share count floats with creation and redemption. An exchange-traded product's share count changes every day as units are created and redeemed, so no filing gives a stable count to divide by. FINRA's shares-short figure is exact; a percentage of it would not be.
What is CPST's days to cover?
1.00 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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