Calamos S&P 500 Structured Alt Protection ETF - September
CPST
18 hedge funds and large institutions have $20.6M invested in Calamos S&P 500 Structured Alt Protection ETF - September in 2026 Q2 according to their latest regulatory filings, with 2 funds opening new positions, 2 increasing their positions, 9 reducing their positions, and 3 closing their positions.
5% less funds holding
Funds holding: 19 → 18 (-1)
8.21% less ownership
Funds ownership: 70.05% → 61.84% (-8.2%)
9% less capital invested
Capital invested by funds: $22.7M → $20.6M (-$2.04M)
33% less first-time investments, than exits
New positions opened: 2 | Existing positions closed: 3
78% less repeat investments, than reductions
Existing positions increased: 2 | Existing positions reduced: 9
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Susquehanna International Group
Bala Cynwyd,
Pennsylvania
|
+$1.24M |
| 2 |
APFP
Action Point Financial Planning
Grand Rapids,
Michigan
|
+$553K |
| 3 |
IAAG
Innovative Asset Advisors Group
Shelton,
Connecticut
|
+$111K |
| 4 |
UBS Group
Zurich,
Switzerland
|
+$26.8K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Calamos Advisors
Naperville,
Illinois
|
-$2.42M |
| 2 |
OMC
Old Mission Capital
Chicago,
Illinois
|
-$770K |
| 3 |
LWP
LeClair Wealth Partners
Dublin,
Ohio
|
-$446K |
| 4 |
HI
Harbour Investments
Madison,
Wisconsin
|
-$293K |
| 5 |
Osaic Holdings
Scottsdale,
Arizona
|
-$283K |
CPST Hedge Fund Activity: Q2 2026 in Review
18 of the 8,318 institutional investors tracked by Wall St. Rank reported a position in Calamos S&P 500 Structured Alt Protection ETF - September (CPST) for Q2 2026, worth a combined $20.6M — down 9% from $22.7M a quarter earlier.
Sellers outnumbered buyers: 3 funds closed out of CPST and 2 opened new positions — a net loss of 1 holder — while 9 trimmed existing stakes and 2 added.
The largest buyer was Susquehanna International Group, adding an estimated $1.24M. The largest seller was Calamos Advisors, cutting an estimated $2.42M.
- 18 institutional investors held Calamos S&P 500 Structured Alt Protection ETF - September (CPST) as of Q2 2026, down from 19 in Q1 2026.
- Funds reported $20.6M of Calamos S&P 500 Structured Alt Protection ETF - September stock for Q2 2026, down 9% quarter-over-quarter.
- 2 funds opened new Calamos S&P 500 Structured Alt Protection ETF - September positions in Q2 2026 and 3 closed out, a net change of -1 holder.
- The largest Calamos S&P 500 Structured Alt Protection ETF - September buyer in Q2 2026 was Susquehanna International Group, an estimated $1.24M added.
- The largest Calamos S&P 500 Structured Alt Protection ETF - September seller in Q2 2026 was Calamos Advisors, an estimated $2.42M sold.
Based on aggregated 13F filings for Q2 2026.