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CPSU 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
3,645
vs previous settlement
−1,847 (-33.6%)
days to cover
1.17
Settlement date
15 Sep 2026

Shares short over time

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

Fails to deliver

The SEC's fails-to-deliver figure for CPSU: 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
250
14 Sep 2026
Highest in window
75,812
3 Jun 2026
Days with a balance
129
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 76K shares.

History

Every FINRA settlement we hold for CPSU, newest first.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 20263,645−1,8471.17
31 Aug 20265,492−5,6115.12
14 Aug 202611,103+6047.73
31 Jul 202610,499−6,0185.27
15 Jul 202616,517−2,3027.33
30 Jun 202618,819−11,8381.12
15 Jun 202630,657+19,3921.00
29 May 202611,265+2,5266.05
15 May 20268,739+2,0759.76
30 Apr 20266,664+114138.83
15 Apr 20266,550−60314.36
31 Mar 20267,153−78856.77
13 Mar 20267,941−12,2085.38
27 Feb 202620,149−4,12423.68
13 Feb 202624,273+7,10011.12
30 Jan 202617,173+2,80485.87
15 Jan 202614,369−1,68431.10
31 Dec 202516,053+124119.80
15 Dec 202515,929−1,96817.88
28 Nov 202517,897−4,01331.07
14 Nov 202521,910+98999.99
31 Oct 202521,812−1,085127.56
15 Oct 202522,897+1,51425.38
30 Sep 202521,383−3855.32
15 Sep 202521,386+1,98843.91
29 Aug 202519,398−21011.10
15 Aug 202519,608−2,04320.55
31 Jul 202521,651−26211.88
15 Jul 202521,913−6,9831.00
30 Jun 202528,896+3,7871.00
13 Jun 202525,109–1.00

Scroll inside the table for earlier settlements, back to 13 Jun 2025.

Questions

Frequently asked questions

What is CPSU's short interest?
3,645 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, down 1,847 from the previous settlement.
Why is there no percentage for CPSU?
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 CPSU's days to cover?
1.17 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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