Calamos S&P 500 Structured Alt Protection ETF - October
CPSO
23 hedge funds and large institutions have $14.6M invested in Calamos S&P 500 Structured Alt Protection ETF - October in 2025 Q4 according to their latest regulatory filings, with 12 funds opening new positions, 5 increasing their positions, 2 reducing their positions, and 0 closing their positions.
150% more repeat investments, than reductions
Existing positions increased: 5 | Existing positions reduced: 2
109% more funds holding
Funds holding: 11 → 23 (+12)
57% more capital invested
Capital invested by funds: $9.28M → $14.6M (+$5.28M)
3.92% less ownership
Funds ownership: 57.71% → 53.79% (-3.9%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Calamos Advisors
Naperville,
Illinois
|
+$855K |
| 2 |
Susquehanna International Group
Bala Cynwyd,
Pennsylvania
|
+$579K |
| 3 |
HI
Harbour Investments
Madison,
Wisconsin
|
+$526K |
| 4 |
OMC
Old Mission Capital
Chicago,
Illinois
|
+$471K |
| 5 |
GFG
Grantvest Financial Group
Matawan,
New Jersey
|
+$452K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Commonwealth Equity Services
Waltham,
Massachusetts
|
-$71.6K |
| 2 |
UBS Group
Zurich,
Switzerland
|
-$34.2K |
CPSO Hedge Fund Activity: Q4 2025 in Review
23 of the 8,264 institutional investors tracked by Wall St. Rank reported a position in Calamos S&P 500 Structured Alt Protection ETF - October (CPSO) for Q4 2025, worth a combined $14.6M — up 57% from $9.28M a quarter earlier.
Buyers outnumbered sellers: 12 funds opened new CPSO positions and 0 closed out — a net gain of 12 holders — while 5 added to existing stakes and 2 trimmed.
The largest buyer was Calamos Advisors, adding an estimated $855K. The largest seller was Commonwealth Equity Services, cutting an estimated $71.6K.
- 23 institutional investors held Calamos S&P 500 Structured Alt Protection ETF - October (CPSO) as of Q4 2025, up from 11 in Q3 2025.
- Funds reported $14.6M of Calamos S&P 500 Structured Alt Protection ETF - October stock for Q4 2025, up 57% quarter-over-quarter.
- 12 funds opened new Calamos S&P 500 Structured Alt Protection ETF - October positions in Q4 2025 and 0 closed out, a net change of +12 holders.
- The largest Calamos S&P 500 Structured Alt Protection ETF - October buyer in Q4 2025 was Calamos Advisors, an estimated $855K added.
- The largest Calamos S&P 500 Structured Alt Protection ETF - October seller in Q4 2025 was Commonwealth Equity Services, an estimated $71.6K sold.
Based on aggregated 13F filings for Q4 2025.