Calamos S&P 500 Structured Alt Protection ETF - September
CPST
19 hedge funds and large institutions have $22.7M invested in Calamos S&P 500 Structured Alt Protection ETF - September in 2026 Q1 according to their latest regulatory filings, with 3 funds opening new positions, 2 increasing their positions, 6 reducing their positions, and 2 closing their positions.
50% more first-time investments, than exits
New positions opened: 3 | Existing positions closed: 2
19% more capital invested
Capital invested by funds: $19M → $22.7M (+$3.69M)
11.49% more ownership
Funds ownership: 58.56% → 70.05% (+11%)
0% more funds holding
Funds holding: 19 → 19 (0)
67% less repeat investments, than reductions
Existing positions increased: 2 | Existing positions reduced: 6
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Calamos Advisors
Naperville,
Illinois
|
+$3.97M |
| 2 |
Susquehanna International Group
Bala Cynwyd,
Pennsylvania
|
+$522K |
| 3 |
LWP
LeClair Wealth Partners
Dublin,
Ohio
|
+$449K |
| 4 |
OMC
Old Mission Capital
Chicago,
Illinois
|
+$1.17K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
CWM
Calamos Wealth Management
Naperville,
Illinois
|
-$628K |
| 2 |
CCAL
City Center Advisors LLC
Troy,
Michigan
|
-$314K |
| 3 |
PCA
Pallas Capital Advisors
Braintree,
Massachusetts
|
-$250K |
| 4 |
Osaic Holdings
Scottsdale,
Arizona
|
-$134K |
| 5 |
HI
Harbour Investments
Madison,
Wisconsin
|
-$107K |
CPST Hedge Fund Activity: Q1 2026 in Review
19 of the 8,191 institutional investors tracked by Wall St. Rank reported a position in Calamos S&P 500 Structured Alt Protection ETF - September (CPST) for Q1 2026, worth a combined $22.7M — up 19% from $19M a quarter earlier.
Buyers outnumbered sellers: 3 funds opened new CPST positions and 2 closed out — a net gain of 1 holder — while 2 added to existing stakes and 6 trimmed.
The largest buyer was Calamos Advisors, adding an estimated $3.97M. The largest seller was Calamos Wealth Management, cutting an estimated $628K.
- 19 institutional investors held Calamos S&P 500 Structured Alt Protection ETF - September (CPST) as of Q1 2026, unchanged from Q4 2025.
- Funds reported $22.7M of Calamos S&P 500 Structured Alt Protection ETF - September stock for Q1 2026, up 19% quarter-over-quarter.
- 3 funds opened new Calamos S&P 500 Structured Alt Protection ETF - September positions in Q1 2026 and 2 closed out, a net change of +1 holder.
- The largest Calamos S&P 500 Structured Alt Protection ETF - September buyer in Q1 2026 was Calamos Advisors, an estimated $3.97M added.
- The largest Calamos S&P 500 Structured Alt Protection ETF - September seller in Q1 2026 was Calamos Wealth Management, an estimated $628K sold.
Based on aggregated 13F filings for Q1 2026.