CPST · Calamos S&P 500 Structured Alt Protection ETF - September ETF
$28.13
-0.05 (-0.16%)
At close · Sep 4
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 19
Total Value: $22,676,065
Total Shares: 840,633
Institutional Ownership Trend
8 quarters
Holder Concentration
Across 19 13F filers · Δ vs Dec 31, 2025Top Holder
51.5%
+10.7 pts
Top 5
82.5%
+0.6 pts
Top 10
92.8%
−0.3 pts
HHI
3,007
Highly concentrated+717
Quarterly Activity
vs Dec 31, 2025
New
3
Increased
2
Decreased
6
Sold Out
3
Unchanged
8
Holder count:
0
Institutional value:
+19.4%
Shares held:
+19.6%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Large Calamos Advisors LLC | +146,291 | 433,044 | |
| Mid OLD MISSION CAPITAL LLC | +43 | 28,562 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mid Calamos Wealth Management LLC | −23,181 | 102,338 | |
| Large OSAIC HOLDINGS, INC. | −4,933 | 104,344 | |
| Mid HARBOUR INVESTMENTS, INC. | −3,939 | 11,556 | |
| Small Camelot Portfolios, LLC | −505 | 25,239 | |
| Mega UBS Group AG | −152 | 37 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | 19,245 | $519,133 | |
| Small LeClair Wealth Partners LLC | 16,552 | $446,490 | |
| Small Spartan Wealth Advisory Services LLC | 10,709 | $288,875 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Micro City Center Advisors, LLC | 11,629 | $314,262 | |
| Mid Pallas Capital Advisors LLC | 9,242 | $249,755 | |
| Small Motiv8 Investments LLC | 1,349 | $36,455 |
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Large Calamos Advisors LLC CPST | $11,681,361 | 51.51% | 433,044 | Shares | 2026-05-04 | |
| Large OSAIC HOLDINGS, INC. CPST | $2,814,679 | 12.41% | 104,344 | Shares | 2026-05-15 | |
| Mid Calamos Wealth Management LLC CPST | $2,760,567 | 12.17% | 102,338 | Shares | 2026-05-04 | |
| Mid OLD MISSION CAPITAL LLC CPST | $770,459 | 3.40% | 28,562 | Shares | 2026-05-15 | |
| Small Camelot Portfolios, LLC CPST | $680,822 | 3.00% | 25,239 | Shares | 2026-05-08 | |
| Large COMMONWEALTH EQUITY SERVICES, LLC CPST | $552,528 | 2.44% | 20,483 | Shares | 2026-04-27 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP CPST | $519,133 | 2.29% | 19,245 | Shares | 2026-05-15 | |
| Small LeClair Wealth Partners LLC CPST | $446,490 | 1.97% | 16,552 | Shares | 2026-05-05 | |
| Micro Blue Water Asset Management CPST | $446,490 | 1.97% | 16,552 | Shares | 2026-05-05 | |
| Mid Capital Analysts, LLC CPST | $370,770 | 1.64% | 13,745 | Shares | 2026-05-14 | |
| Micro Grantvest Financial Group LLC CPST | $329,418 | 1.45% | 12,212 | Shares | 2026-05-11 | |
| Mid HARBOUR INVESTMENTS, INC. CPST | $311,723 | 1.37% | 11,556 | Shares | 2026-05-15 | |
| Small Spartan Wealth Advisory Services LLC CPST | $288,875 | 1.27% | 10,709 | Shares | 2026-05-06 | |
| Small HOHIMER WEALTH MANAGEMENT, LLC CPST | $239,753 | 1.06% | 8,888 | Shares | 2026-05-01 | |
| Micro Sterling Financial Planning, Inc. CPST | $216,285 | 0.95% | 8,018 | Shares | 2026-05-06 | |
| Micro BURKETT FINANCIAL SERVICES, LLC CPST | $194,220 | 0.86% | 7,200 | Shares | 2026-04-01 | |
| Mid Sound Income Strategies, LLC CPST | $43,375 | 0.19% | 1,608 | Shares | 2026-04-27 | |
| Small CREATIVE FINANCIAL DESIGNS INC /ADV CPST | $8,119 | 0.04% | 301 | Shares | 2026-04-13 | |
| Mega UBS Group AG CPST | $998 | 0.00% | 37 | Shares | 2026-05-05 |