CPST vs. SROI
CPST (Calamos S&P 500 Structured Alt Protection ETF - September) and SROI (Calamos Antetokounmpo Global Sustainable Equities ETF) are both exchange-traded funds — CPST is a Defined Outcome fund tracking the MerQube Cap Protect US Lrg Cap PR Index - Sep, while SROI is a Global Equities fund actively managed by Calamos. CPST is passively managed, while SROI is actively managed. Over the past year, CPST returned 9.21% vs 25.05% for SROI. A 0.77 correlation means they provide meaningful diversification when combined. CPST charges 0.69%/yr vs 0.95%/yr for SROI.
Performance
CPST vs. SROI - Performance Comparison
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Returns By Period
In the year-to-date period, CPST achieves a 1.02% return, which is significantly lower than SROI's 3.59% return.
CPST
- 1D
- 0.13%
- 1M
- 0.92%
- YTD
- 1.02%
- 6M
- 2.02%
- 1Y
- 9.21%
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
SROI
- 1D
- 0.99%
- 1M
- 5.25%
- YTD
- 3.59%
- 6M
- 5.89%
- 1Y
- 25.05%
- 3Y*
- 12.61%
- 5Y*
- —
- 10Y*
- —
CPST vs. SROI - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | |
|---|---|---|---|
CPST Calamos S&P 500 Structured Alt Protection ETF - September | 1.02% | 6.73% | 2.30% |
SROI Calamos Antetokounmpo Global Sustainable Equities ETF | 3.59% | 16.36% | -1.02% |
Correlation
The correlation between CPST and SROI is 0.79, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.79 |
Correlation (All Time) Calculated using the full available price history since Sep 4, 2024 | 0.77 |
The correlation between CPST and SROI has been stable across timeframes, ranging from 0.77 to 0.79 — a consistent structural relationship.
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Return for Risk
CPST vs. SROI — Risk / Return Rank
CPST
SROI
CPST vs. SROI - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Calamos S&P 500 Structured Alt Protection ETF - September (CPST) and Calamos Antetokounmpo Global Sustainable Equities ETF (SROI). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
| CPST | SROI | Difference | |
|---|---|---|---|
Sharpe ratioReturn per unit of total volatility | 3.40 | 1.91 | +1.49 |
Sortino ratioReturn per unit of downside risk | 5.87 | 2.70 | +3.17 |
Omega ratioGain probability vs. loss probability | 1.81 | 1.35 | +0.46 |
Calmar ratioReturn relative to maximum drawdown | 6.25 | 2.50 | +3.75 |
Martin ratioReturn relative to average drawdown | 30.44 | 10.81 | +19.63 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| CPST | SROI | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 3.40 | 1.91 | +1.49 |
Sharpe Ratio (All Time)Calculated using the full available price history | 1.82 | 0.88 | +0.94 |
Drawdowns
CPST vs. SROI - Drawdown Comparison
The maximum CPST drawdown since its inception was -3.79%, smaller than the maximum SROI drawdown of -15.38%. Use the drawdown chart below to compare losses from any high point for CPST and SROI.
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Drawdown Indicators
| CPST | SROI | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -3.79% | -15.38% | +11.59% |
Max Drawdown (1Y)Largest decline over 1 year | -1.42% | -10.19% | +8.77% |
Current DrawdownCurrent decline from peak | 0.00% | -1.52% | +1.52% |
Average DrawdownAverage peak-to-trough decline | -0.37% | -2.50% | +2.13% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.29% | 2.35% | -2.06% |
Volatility
CPST vs. SROI - Volatility Comparison
The current volatility for Calamos S&P 500 Structured Alt Protection ETF - September (CPST) is 1.15%, while Calamos Antetokounmpo Global Sustainable Equities ETF (SROI) has a volatility of 6.97%. This indicates that CPST experiences smaller price fluctuations and is considered to be less risky than SROI based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| CPST | SROI | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.15% | 6.97% | -5.82% |
Volatility (6M)Calculated over the trailing 6-month period | 1.73% | 10.86% | -9.13% |
Volatility (1Y)Calculated over the trailing 1-year period | 2.73% | 13.24% | -10.51% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 3.49% | 13.86% | -10.37% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 3.49% | 13.86% | -10.37% |
CPST vs. SROI - Expense Ratio Comparison
CPST has a 0.69% expense ratio, which is lower than SROI's 0.95% expense ratio.
Dividends
CPST vs. SROI - Dividend Comparison
CPST has not paid dividends to shareholders, while SROI's dividend yield for the trailing twelve months is around 0.58%.
| TTM | 2025 | 2024 | 2023 | |
|---|---|---|---|---|
CPST Calamos S&P 500 Structured Alt Protection ETF - September | 0.00% | 0.00% | 0.00% | 0.00% |
SROI Calamos Antetokounmpo Global Sustainable Equities ETF | 0.58% | 0.60% | 0.68% | 0.94% |