Who owns CPSRWhat CPSR owns — n/a

Who owns Calamos S&P 500 Structured Alt Protection ETF – March?

Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.

Institutional ownership of CPSR from SEC Form 13F filings across 19 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, 19 institutions disclosed 629,676 shares of Calamos S&P 500 Structured Alt Protection ETF – March worth $16.3M — about 67.9% of shares outstanding; the largest disclosed holder is Calamos Advisors LLC. Source: SEC Form 13F filings, parsed by EvidInvest.

13F holders

$16.3M

value, 2026 filers

67.9%

of shares outstanding (629,676 sh)

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 CPSR's shares outstanding

#	Manager	Shares	Value	% of fund	% of co.	Δ shares QoQ
1	Calamos Advisors LLC	371,322	$9.6M	0.0%	40%	-13.5%
2	Calamos Wealth Management LLC	72,288	$1.9M	0.1%	7.8%	-1.9%
3	COMMONWEALTH EQUITY SERVICES, LLC	27,797	$718,410	0.0%	3%	0.0%
4	SUSQUEHANNA INTERNATIONAL GROUP, LLP	26,663	$689,103	0.0%	2.9%	-5.5%
5	Farther Finance Advisors, LLC	17,921	$463,166	0.0%	1.9%	0.0%
6	Blue Water Asset Management	16,665	$430,705	0.1%	1.8%	0.0%
7	Fortitude Advisory Group L.L.C.	15,189	$392,558	0.1%	1.6%	0.0%
8	STOLZ & ASSOCIATES, PS	11,455	$296,053	0.2%	1.2%	0.0%
9	JIM SAULNIER & ASSOCIATES, LLC	10,901	$281,735	0.1%	1.2%	0.0%
10	ADAMSBROWN WEALTH CONSULTANTS LLC	10,665	$275,636	0.1%	1.1%	0.0%
11	Garden State Investment Advisory Services LLC	10,528	$272,095	0.0%	1.1%	-0.7%
12	Waverly Advisors, LLC	9,660	$249,662	0.0%	1%	0.0%
13	OLD MISSION CAPITAL LLCNEW	8,863	$229,063	0.0%	1%	new
14	MML INVESTORS SERVICES, LLC	7,935	$205,079	0.0%	0.9%	0.0%
15	FIDUCIARY FINANCIAL ADVISORSNEW	5,880	$151,969	0.0%	0.6%	new
16	New England Capital Financial Advisors LLC	2,293	$59,263	0.0%	0.2%	+6.7%
17	HARBOUR INVESTMENTS, INC.	1,846	$47,710	0.0%	0.2%	0.0%
18	OSAIC HOLDINGS, INC.	1,533	$39,619	0.0%	0.2%	0.0%
19	CREATIVE FINANCIAL DESIGNS INC /ADV	272	$7,030	0.0%	0%	-81.8%

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.