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CPSF 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
3,549
vs previous settlement
−4,720 (-57.1%)
days to cover
1.21
Settlement date
15 Sep 2026

Shares short over time

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

Fails to deliver

The SEC's fails-to-deliver figure for CPSF: 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
917
28 Aug 2026
Highest in window
61,328
9 Feb 2026
Days with a balance
59
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 61K shares.

History

Every FINRA settlement we hold for CPSF, newest first.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 20263,549−4,7201.21
31 Aug 20268,269−9,9784.69
14 Aug 202618,247+5,90023.85
31 Jul 202612,347+1,5728.88
15 Jul 202610,775+4,85111.79
30 Jun 20265,924+8079.11
15 Jun 20265,117−9933.38
29 May 20266,110+2,1932.16
15 May 20263,917−3,0871.06
30 Apr 20267,004−1,1046.60
15 Apr 20268,108−6,1193.56
31 Mar 202614,227+11,6672.09
13 Mar 20262,560−3,4911.02
27 Feb 20266,051−7301.03
13 Feb 20266,781+481.00
30 Jan 20266,733+5,9341.00
15 Jan 2026799+6721.00
31 Dec 2025127−2361.00
15 Dec 2025363−1571.00
28 Nov 2025520−31.00
14 Nov 2025523−1803.76
31 Oct 2025703−1,2371.00
15 Oct 20251,940+1,8161.67
30 Sep 2025124+1021.00
15 Sep 202522+181.00
29 Aug 20254−1,1571.00
15 Aug 20251,16101.00
31 Jul 20251,161−8801.00
15 Jul 20252,041−1,0821.00
30 Jun 20253,123−6061.74
13 Jun 20253,729−5341.85
30 May 20254,263−11,1531.00
15 May 202515,416+6,3262.76
30 Apr 20259,090−5,5861.10
15 Apr 202514,676−3,0101.00
31 Mar 202517,686−4,9075.28
14 Mar 202522,593+2,4251.00
28 Feb 202520,168−32,5091.00
14 Feb 202552,677–1.00

Scroll inside the table for earlier settlements, back to 14 Feb 2025.

Questions

Frequently asked questions

What is CPSF's short interest?
3,549 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, down 4,720 from the previous settlement.
Why is there no percentage for CPSF?
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 CPSF's days to cover?
1.21 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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