ETF Holders

Who owns CPST?

Buffer or defined outcome

Calamos S&P 500 Structured Alt Protection ETF - September · Calamos

18 institutions reported holding CPST, worth $20.6M, in Form 13F filings for June 30, 2026.

13F holders
18
Institutional value
$20.6M
Change from prior quarter
-9.0%
−$2.0M, with price moves
New and sold-out firms
2 / 3
2 added, 9 trimmed

Top 10 institutional holders of CPST

FirmLocationValueSharesChange
Calamos Advisors LLCNaperville, IL$9.6M345,128−87,916 shares
Calamos Wealth Management LLCNaperville, IL$2.7M97,729−4,609 shares
Osaic Holdings, Inc.Scottsdale, AZ$2.6M94,067−10,277 shares
Susquehanna International Group, LLPBala Cynwyd, PA$1.8M64,209+44,964 shares
Camelot Portfolios, LLCMaumee, OH$693K24,917−322 shares
Commonwealth Equity Services, LLCWaltham, MA$570K20,483No change
Fiduciary Financial AdvisorsGrand Rapids, MI$558K20,051New position
Blue Water Asset ManagementGrand Rapids, MI$450K16,190−362 shares
Capital Analysts, LLCFort Washington, PA$383K13,745No change
Spartan Wealth Advisory Services LLCBingham Farms, MI$298K10,709No change
8 more firms

The full list comes with the Advisors and Institutions package.

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From SEC Form 13F, for managers with $100M+ in US securities. Change compares June 30, 2026 with March 31, 2026. “New position” means no holding in the prior filing we have.

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Frequently asked questions

Who owns CPST?

18 institutional managers reported holding CPST in Form 13F filings for June 30, 2026, worth $20.6M in total. The largest reported position was held by Calamos Advisors LLC, at $9.6M.

Did institutions buy or sell CPST last quarter?

Reported 13F value fell 9.0% from March 31, 2026, which includes price moves as well as buying and selling. 2 firms reported a new position and 3 sold all of theirs.

What is a Form 13F?

A quarterly report filed with the SEC by institutional investment managers with $100 million or more in qualifying US securities. It lists their long positions at quarter end. It doesn't cover retail investors, cash, short positions, or managers under the threshold, so it shows part of a fund's ownership, not all of it.

How often is CPST ownership data updated?

13F filings are due 45 days after each quarter ends. The next set is due around mid-November. Positions can be up to about four and a half months old by the time a new set arrives.