Calamos S&P 500 Structured Alt Protection ETF - September
CPST
19 hedge funds and large institutions have $19M invested in Calamos S&P 500 Structured Alt Protection ETF - September in 2025 Q4 according to their latest regulatory filings, with 5 funds opening new positions, 4 increasing their positions, 3 reducing their positions, and 4 closing their positions.
268% more capital inflows, than outflows
Capital inflows: $4.74M | Capital outflows: $1.29M
33% more repeat investments, than reductions
Existing positions increased: 4 | Existing positions reduced: 3
25% more first-time investments, than exits
New positions opened: 5 | Existing positions closed: 4
6.37% more ownership
Funds ownership: 52.19% → 58.56% (+6.4%)
6% more funds holding
Funds holding: 18 → 19 (+1)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Osaic Holdings
Scottsdale,
Arizona
|
+$2.68M |
| 2 |
Calamos Advisors
Naperville,
Illinois
|
+$818K |
| 3 |
Old Mission Capital
Chicago,
Illinois
|
+$403K |
| 4 |
City Center Advisors LLC
Troy,
Michigan
|
+$312K |
| 5 |
Sound Income Strategies
Ft Lauderdale,
Florida
|
+$43.2K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Jane Street
New York
|
-$344K |
| 2 |
Calamos Wealth Management
Naperville,
Illinois
|
-$295K |
| 3 |
Susquehanna International Group
Bala Cynwyd,
Pennsylvania
|
-$274K |
| 4 |
Greenberg Financial Group
Tucson,
Arizona
|
-$237K |
| 5 |
Principal Securities
Des Moines,
Iowa
|
-$122K |
CPST Hedge Fund Activity: Q4 2025 in Review
19 of the 8,294 institutional investors tracked by Wall St. Rank reported a position in Calamos S&P 500 Structured Alt Protection ETF - September (CPST) for Q4 2025, worth a combined $19M — up 24% from $15.3M a quarter earlier.
Buyers outnumbered sellers: 5 funds opened new CPST positions and 4 closed out — a net gain of 1 holder — while 4 added to existing stakes and 3 trimmed.
The largest buyer was Osaic Holdings, adding an estimated $2.68M. The largest seller was Jane Street, exiting entirely with an estimated $344K sold.
- 19 institutional investors held Calamos S&P 500 Structured Alt Protection ETF - September (CPST) as of Q4 2025, up from 18 in Q3 2025.
- Funds reported $19M of Calamos S&P 500 Structured Alt Protection ETF - September stock for Q4 2025, up 24% quarter-over-quarter.
- 5 funds opened new Calamos S&P 500 Structured Alt Protection ETF - September positions in Q4 2025 and 4 closed out, a net change of +1 holder.
- The largest Calamos S&P 500 Structured Alt Protection ETF - September buyer in Q4 2025 was Osaic Holdings, an estimated $2.68M added.
- The largest Calamos S&P 500 Structured Alt Protection ETF - September seller in Q4 2025 was Jane Street, an estimated $344K sold.
Based on aggregated 13F filings for Q4 2025.