Who owns Calamos S&P 500 Structured Alt Protection ETF - September?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of CPST from SEC Form 13F filings across 18 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 18 institutions disclosed 742,124 shares of Calamos S&P 500 Structured Alt Protection ETF - September worth $20.6M — about 64.5% of shares outstanding; the largest disclosed holder is Calamos Advisors LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
18
13F holders
$20.6M
value, 2026 filers
64.5%
of shares outstanding (742,124 sh)
2
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of CPST's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | Calamos Advisors LLC | 345,128 | $9.6M | 0.0% | 30% | -20.3% |
| 2 | Calamos Wealth Management LLC | 97,729 | $2.7M | 0.1% | 8.5% | -4.5% |
| 3 | OSAIC HOLDINGS, INC. | 94,067 | $2.6M | 0.0% | 8.2% | -9.8% |
| 4 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 64,209 | $1.8M | 0.0% | 5.6% | +233.6% |
| 5 | Camelot Portfolios, LLC | 24,917 | $692,942 | 0.5% | 2.2% | -1.3% |
| 6 | COMMONWEALTH EQUITY SERVICES, LLC | 20,483 | $569,630 | 0.0% | 1.8% | 0.0% |
| 7 | FIDUCIARY FINANCIAL ADVISORSNEW | 20,051 | $557,618 | 0.1% | 1.7% | new |
| 8 | Blue Water Asset Management | 16,190 | $450,244 | 0.1% | 1.4% | -2.2% |
| 9 | Capital Analysts, LLC | 13,745 | $383,000 | 0.0% | 1.2% | 0.0% |
| 10 | Spartan Wealth Advisory Services LLC | 10,709 | $297,817 | 0.0% | 0.9% | 0.0% |
| 11 | Grantvest Financial Group LLC | 9,295 | $258,494 | 0.1% | 0.8% | -23.9% |
| 12 | Sterling Financial Planning, Inc. | 8,018 | $222,981 | 0.1% | 0.7% | 0.0% |
| 13 | HOHIMER WEALTH MANAGEMENT, LLC | 7,878 | $219,087 | 0.0% | 0.7% | -11.4% |
| 14 | Innovative Asset Advisors Group, LLCNEW | 4,035 | $112,213 | 0.0% | 0.4% | new |
| 15 | BURKETT FINANCIAL SERVICES, LLC | 3,420 | $95,110 | 0.0% | 0.3% | -52.5% |
| 16 | UBS Group AG | 1,010 | $28,088 | 0.0% | 0.1% | +2629.7% |
| 17 | HARBOUR INVESTMENTS, INC. | 939 | $26,114 | 0.0% | 0.1% | -91.9% |
| 18 | CREATIVE FINANCIAL DESIGNS INC /ADV | 301 | $8,371 | 0.0% | 0% | 0.0% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.