CBOA vs. CPST

Last updated Jun 4, 2026

CBOA (Calamos Bitcoin Structured Alt Protection ETF - April) and CPST (Calamos S&P 500 Structured Alt Protection ETF - September) are both Defined Outcome funds from Calamos - CBOA tracks the CBOE Bitcoin US ETF Index while CPST tracks the MerQube Cap Protect US Lrg Cap PR Index - Sep. Both are passively managed. Over the past year, CBOA returned -4.79% vs 7.61% for CPST. At a 0.38 correlation, their price movements are largely independent. Both charge a 0.69% expense ratio.

Performance

CBOA vs. CPST - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Calamos Bitcoin Structured Alt Protection ETF - April (CBOA) and Calamos S&P 500 Structured Alt Protection ETF - September (CPST). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, CBOA achieves a -6.06% return, which is significantly lower than CPST's 2.67% return.

CBOA

• 1D: -0.19%
• 1M: -1.65%
• YTD: -6.06%
• 6M: -6.36%
• 1Y: -4.79%
• 3Y*: —
• 5Y*: —
• 10Y*: —

CPST

• 1D: 0.00%
• 1M: 0.87%
• YTD: 2.67%
• 6M: 2.98%
• 1Y: 7.61%
• 3Y*: —
• 5Y*: —
• 10Y*: —

*Multi-year figures are annualized to reflect compound growth (CAGR)

CBOA vs. CPST - Yearly Performance Comparison

	2026 (YTD)	2025
CBOA Calamos Bitcoin Structured Alt Protection ETF - April	-6.06%	5.24%
CPST Calamos S&P 500 Structured Alt Protection ETF - September	2.67%	9.48%

Correlation

The correlation between CBOA and CPST is 0.43, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.43
Correlation (All Time) Calculated using the full available price history since Apr 8, 2025	0.38

Return for Risk

CBOA vs. CPST — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

CBOA

CBOA Risk / Return Rank: 3
CBOA Sharpe Ratio Rank: 2
CBOA Sortino Ratio Rank: 3
CBOA Omega Ratio Rank: 2
CBOA Calmar Ratio Rank: 4
CBOA Martin Ratio Rank: 3

CPST

CPST Risk / Return Rank: 94
CPST Sharpe Ratio Rank: 94
CPST Sortino Ratio Rank: 97
CPST Omega Ratio Rank: 96
CPST Calmar Ratio Rank: 89
CPST Martin Ratio Rank: 95

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

CBOA vs. CPST - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Calamos Bitcoin Structured Alt Protection ETF - April (CBOA) and Calamos S&P 500 Structured Alt Protection ETF - September (CPST). 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.

	CBOA	CPST	Difference
Sharpe ratio: Return per unit of total volatility	-0.89	3.56	-4.45
Sortino ratio: Return per unit of downside risk	-1.13	5.91	-7.05
Omega ratio: Gain probability vs. loss probability	0.85	1.82	-0.97
Calmar ratio: Return relative to maximum drawdown	-0.61	5.38	-5.99
Martin ratio: Return relative to average drawdown	-1.18	28.97	-30.16
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CBOA vs. CPST - Sharpe Ratio Comparison

The current CBOA Sharpe Ratio is -0.89, which is lower than the CPST Sharpe Ratio of 3.56. The chart below compares the historical Sharpe Ratios of CBOA and CPST, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	CBOA	CPST	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	-0.89	3.56	-4.45
Sharpe Ratio (All Time) Calculated using the full available price history	-0.19	2.02	-2.21

Drawdowns

CBOA vs. CPST - Drawdown Comparison

The maximum CBOA drawdown since its inception was -7.91%, which is greater than CPST's maximum drawdown of -3.79%. Use the drawdown chart below to compare losses from any high point for CBOA and CPST.

Drawdown Indicators

	CBOA	CPST	Difference
Max Drawdown Largest peak-to-trough decline	-7.91%	-3.79%	-4.12%
Max Drawdown (1Y) Largest decline over 1 year	-7.91%	-1.42%	-6.49%
Current Drawdown Current decline from peak	-7.91%	0.00%	-7.91%
Average Drawdown Average peak-to-trough decline	-2.38%	-0.35%	-2.03%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.06%	0.26%	+3.80%

Volatility

CBOA vs. CPST - Volatility Comparison

Calamos Bitcoin Structured Alt Protection ETF - April (CBOA) has a higher volatility of 0.91% compared to Calamos S&P 500 Structured Alt Protection ETF - September (CPST) at 0.30%. This indicates that CBOA's price experiences larger fluctuations and is considered to be riskier than CPST based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CBOA	CPST	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.91%	0.30%	+0.61%
Volatility (6M) Calculated over the trailing 6-month period	4.67%	1.60%	+3.07%
Volatility (1Y) Calculated over the trailing 1-year period	5.39%	2.15%	+3.24%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.14%	3.37%	+1.77%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.14%	3.37%	+1.77%

CBOA vs. CPST - Expense Ratio Comparison

Both CBOA and CPST have an expense ratio of 0.69%.

Dividends

CBOA vs. CPST - Dividend Comparison

CBOA's dividend yield for the trailing twelve months is around 2.38%, while CPST has not paid dividends to shareholders.

Position	TTM	2025
CBOA Calamos Bitcoin Structured Alt Protection ETF - April	2.38%	2.24%
CPST Calamos S&P 500 Structured Alt Protection ETF - September	0.00%	0.00%

Frequently Asked Questions

Can I hold both CBOA and CPST in my portfolio?

CBOA and CPST have a correlation of 0.43, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CBOA or CPST?

CBOA has higher volatility (0.91%) compared to CPST (0.30%). In terms of maximum drawdown, CBOA dropped -7.91% vs CPST's -3.79%.

Which ETF is better, CBOA or CPST?

On 1-year performance, CPST leads with 7.61% vs -4.79% for CBOA. Both ETFs have the same 0.69% expense ratio. On volatility, CPST has been the lower-risk option at 0.30%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, CBOA or CPST?

Over the 1-year period, CPST has performed better with a 7.61% return vs -4.79%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, CBOA or CPST?

CBOA and CPST have the same expense ratio: 0.69% per year.

Which ETF pays a higher dividend yield, CBOA or CPST?

CBOA has the higher dividend yield at 2.38%, compared with 0.00% for CPST.

What is the main difference between CBOA and CPST?

CBOA tracks CBOE Bitcoin US ETF Index, while CPST tracks MerQube Cap Protect US Lrg Cap PR Index - Sep.

Which has better risk-adjusted returns?

CPST currently has the higher Sharpe Ratio (3.56 vs -0.89), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.