Calamos S&P 500 Structured Alt Protection ETF… (CPSO) Performance
CPSO total return
Distributions reinvested · as of Oct 23, 2026- YTD
- +5.1% since Dec 31, 2025
- 1 year
- +5.7% total return
- Since first price
- +12.5% since 2024
CPSO trailing returns vs SPY, QQQ, AGG
| Period | CPSO total return | Price only | S&P 500 (SPY) | Nasdaq-100 (QQQ) | U.S. bonds (AGG) |
|---|---|---|---|---|---|
| 1 month | +0.5% | +0.5% | −1.0% | −5.0% | +0.9% |
| 3 months | +2.0% | +2.0% | +3.2% | +1.9% | −0.4% |
| 6 months | +3.6% | +3.6% | +7.8% | +8.4% | −1.5% |
| YTD | +5.1% | +5.1% | +12.3% | +15.1% | −1.0% |
| 1 year | +5.7% | +5.7% | +14.4% | +15.9% | −1.1% |
| Since inceptionOct 1, 2024 | +12.5% | +12.5% | — | — | — |
Total return from adjusted closes (distributions reinvested, before tax). Periods of 3 years or more are also shown annualized. Price only excludes distributions.
Growth of $10,000: CPSO vs SPY
From Oct 1, 2024: CPSO grew to $11,252, SPY to $13,674.
Year-end values with distributions reinvested, no taxes or trading costs. Start: first common trading day of both funds.
CPSO returns by calendar year
1 of 1 full years positive. Best 2025 (+6.2%), worst 2025 (+6.2%). 2026 is year to date.
CPSO annual returns table
| Year | CPSO | Largest drop | SPY | QQQ | AGG |
|---|---|---|---|---|---|
| 2026YTD | +5.1% | −1.4% | +12.3% | +15.1% | −1.0% |
| 2025 | +6.2% | −3.2% | +17.7% | +20.8% | +7.2% |
Largest drop = deepest fall from a high within that calendar year.
Calendar-year return vs largest drop within the year
Most years include a sizable fall at some point even when the year ends higher.
CPSO risk statistics
| Statistic | Since 2024 |
|---|---|
| Annualized return | +6.2% |
| Volatility (annualized) | 2.4% |
| Sharpe ratio | 0.91 |
| Sortino ratio | 1.52 |
| Best month | +2.1% |
| Worst month | −1.2% |
| Best 12 months | +8.1% |
| Worst 12 months | +5.7% |
| Positive months | 87% |
| Beta vs S&P 500 | — |
| Correlation with S&P 500 | — |
From monthly total returns. Sharpe and Sortino use 1–3 month T-bills (BIL) as the risk-free rate, so they need history from 2007 on.
CPSO rolling returns
| Holding period | Periods | Worst | Median | Best | Positive |
|---|---|---|---|---|---|
| 1-year | 13 | +5.7% | +6.1% | +8.1% | 100% |
Every holding period starting at a month-end since 2024. Returns for 3 years and longer are annualized.
CPSO performance overview
Calamos S&P 500 Structured Alt Protection ETF… (CPSO) returned +5.7% over the past year, with distributions reinvested. Since its first recorded price on Oct 1, 2024 it has returned +12.5%. Over the same year S&P 500 (SPY) returned +14.4%.
Related: CPSO chart. See the CPSO overview for the latest quote and fund facts.
CPSO performance FAQ
What is the CPSO return over the past year?
CPSO returned +5.7% over the 12 months to October 23, 2026, including reinvested distributions. On price alone it rose 5.7%.
How much would $10,000 invested in CPSO be worth?
$10,000 invested in CPSO at its first recorded close on October 1, 2024 would be worth about $11,252 on October 23, 2026 with distributions reinvested.
How volatile is CPSO?
Over the past history CPSO had an annualized volatility of 2.4% and a Sharpe ratio of 0.91 (excess return over 1–3 month T-bills per unit of risk).