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CPSO 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
17,977
vs previous settlement
−1,600 (-8.2%)
days to cover
36.61
Settlement date
15 Sep 2026

Shares short over time

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

Fails to deliver

The SEC's fails-to-deliver figure for CPSO: 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
60
11 Sep 2026
Highest in window
39,514
23 Oct 2025
Days with a balance
63
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 40K shares.

History

Every FINRA settlement we hold for CPSO, newest first.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 202617,977−1,60036.61
31 Aug 202619,577+5,78215.38
14 Aug 202613,795+2,8898.74
31 Jul 202610,906+4314.80
15 Jul 202610,475−3,83918.19
30 Jun 202614,314+8,11630.01
15 Jun 20266,198−3713.08
29 May 20266,235+374.41
15 May 20266,198−1446.72
30 Apr 20266,342+1283.11
15 Apr 20266,214−9898.07
31 Mar 20267,203−1,5246.28
13 Mar 20268,727−2,61410.50
27 Feb 202611,341−3,0065.81
13 Feb 202614,347+7,7937.86
30 Jan 20266,554+1,0452.32
15 Jan 20265,509−2,9271.39
31 Dec 20258,436−8909.84
15 Dec 20259,326+1,2055.99
28 Nov 20258,121−4,6291.34
14 Nov 202512,750+3,2893.38
31 Oct 20259,461−6,9691.00
15 Oct 202516,430+13,2191.00
30 Sep 20253,211−71.49
15 Sep 20253,218011.10
29 Aug 20253,218−571.00
15 Aug 20253,27502.53
31 Jul 20253,275−1841.10
15 Jul 20253,459−2189.01
30 Jun 20253,677+19116.64
13 Jun 20253,486−4842.17
30 May 20253,970+23999.25
15 May 20253,731+1874.36
30 Apr 20253,544−5,7811.00
15 Apr 20259,325−4,7941.41
31 Mar 202514,119−31629.85
14 Mar 202514,435+2,04710.43
28 Feb 202512,388+2,9804.98
14 Feb 20259,408−1,4883.78
31 Jan 202510,896−3,8831.28
15 Jan 202514,779−3,7751.00
31 Dec 202418,554−2,6905.54
13 Dec 202421,244+7,6726.30
29 Nov 202413,572+1,9472.37
15 Nov 202411,625+1,4411.18
31 Oct 202410,184−50,7981.00
15 Oct 202460,982–1.00

Scroll inside the table for earlier settlements, back to 15 Oct 2024.

Questions

Frequently asked questions

What is CPSO's short interest?
17,977 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, down 1,600 from the previous settlement.
Why is there no percentage for CPSO?
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 CPSO's days to cover?
36.61 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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