CPST Performance — Calamos S&P 500 Structured Alt Protection ETF - September
Data updated: 2026-10-09
CPST returned +3.32% year to date and +6.26% over one year to Jul 2026. Over one year the fund trailed its Alternative category average: $100 grew to $106, against $108 for the category. Volatility over the past 12 months was 2.11% a year. In the 12 months to Jul 2026 the fund took in a net $4.0M, and assets reached $32.18M.
CPST Growth of $100
What $100 invested in Calamos S&P 500 Structured Alt Protection ETF - September grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Alternative category average over the same months.
| Period | CPST | Category average |
|---|---|---|
| 1 year (Aug 2025 – Jul 2026) | $106 | $108 |
| Since data start (Sep 2024 – Jul 2026) | $113 | $144 |
CPST Trailing Returns
Total returns to Jul 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +3.32% |
| 1 year | +6.26% |
CPST Annual Returns
Calendar-year total returns of Calamos S&P 500 Structured Alt Protection ETF - September, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jul) | +3.32% |
| 2025 | +6.85% |
| 2024 (Sep–Dec) | +2.17% |
CPST Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +0.4% | +0.1% | −0.7% | +1.9% | +0.8% | +0.4% | +0.5% | — | — | — | — | — |
| 2025 | +0.8% | −0.1% | −1.2% | 0.0% | +1.9% | +1.7% | +0.9% | +0.7% | +1.0% | +0.4% | +0.3% | +0.4% |
| 2024 | — | — | — | — | — | — | — | — | +1.5% | −0.2% | +0.9% | −0.1% |
CPST Risk
Risk measures from monthly returns over Aug 2025 – Jul 2026.
- 1-year volatility (annualised): 2.11%
- Best month: +1.92% (Apr 2026)
- Worst month: −0.70% (Mar 2026)
CPST Fund Flows
Monthly money in and out of Calamos S&P 500 Structured Alt Protection ETF - September, from SEC Form N-PORT.
- 12-month net flow: $4.0M
- 12-month gross sales (incl. reinvestments): $6.6M
- Sales ÷ redemptions: 2.48×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jul 2026 | $0 | $0 | $0 |
| Jun 2026 | $0 | $0 | $0 |
| May 2026 | $0 | $693K | −$693K |
| Apr 2026 | $0 | $0 | $0 |
| Mar 2026 | $0 | $0 | $0 |
| Feb 2026 | $0 | $0 | $0 |
| Jan 2026 | $0 | $0 | $0 |
| Dec 2025 | $0 | $0 | $0 |
| Nov 2025 | $0 | $0 | $0 |
| Oct 2025 | $0 | $0 | $0 |
| Sep 2025 | $6.0M | $0 | $6.0M |
| Aug 2025 | $662K | $2.0M | −$1.3M |
CPST Assets Under Management
Net assets of Calamos S&P 500 Structured Alt Protection ETF - September by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-07-31 | $32.18M |
| 2026-04-30 | $32.38M |
| 2026-01-31 | $31.95M |
| 2025-10-31 | $31.62M |
| 2025-07-31 | $26.34M |
| 2025-04-30 | $24.57M |
| 2025-01-31 | $28.74M |
| 2024-10-31 | $27.66M |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.