CPSF vs. APRB

Last updated Aug 4, 2026

CPSF (Calamos S&P 500 Structured Alt Protection ETF - February) and APRB (Aptus April Buffer ETF) are both Defined Outcome funds. Both are actively managed. Their correlation of 0.87 means they have usually moved in the same direction. CPSF charges 0.69%/yr vs 0.25%/yr for APRB.

Performance

CPSF vs. APRB - Performance Comparison

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

Returns By Period

In the year-to-date period, CPSF achieves a 3.13% return, which is significantly lower than APRB's 6.08% return.

CPSF

• 1D: 0.15%
• 1M: 0.67%
• 6M: 2.34%
• YTD: 3.13%
• 1Y: 6.83%
• 3Y*: —
• 5Y*: —
• 10Y*: —
• ALL TIME*: 6.23%

APRB

• 1D: 0.28%
• 1M: 0.99%
• 6M: 4.73%
• YTD: 6.08%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —
• ALL TIME*: —

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
APRB Aptus April Buffer ETF	$26.14K	$47.18K	$43.83K
CPSF Calamos S&P 500 Structured Alt Protection ETF - February	$35.38K	$32.23K	$45.55K

CPSF vs. APRB - Yearly Performance Comparison

	2026 (YTD)	2025
CPSF Calamos S&P 500 Structured Alt Protection ETF - February	3.13%	1.69%
APRB Aptus April Buffer ETF	6.08%	2.48%

Correlation

The correlation between CPSF and APRB is 0.87, meaning they have usually moved in the same direction, including during past declines.

	Correlation
Correlation (All Time) Calculated using the full available price history since Oct 14, 2025	0.87

Return for Risk

CPSF vs. APRB — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

CPSF

CPSF Risk / Return Rank: 96
CPSF Sharpe Ratio Rank: 96
CPSF Sortino Ratio Rank: 97
CPSF Omega Ratio Rank: 96
CPSF Calmar Ratio Rank: 94
CPSF Martin Ratio Rank: 96

APRB

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

CPSF vs. APRB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Calamos S&P 500 Structured Alt Protection ETF - February (CPSF) and Aptus April Buffer ETF (APRB). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	CPSF	APRB	Difference
Sharpe ratio: Return per unit of total volatility	3.27	—	—
Sortino ratio: Return per unit of downside risk	5.13	—	—
Omega ratio: Gain probability vs. loss probability	1.69	—	—
Calmar ratio: Return relative to maximum drawdown	5.28	—	—
Martin ratio: Return relative to average drawdown	25.30	—	—

Drawdowns

CPSF vs. APRB - Drawdown Comparison

The maximum CPSF drawdown since its inception was -2.89%, smaller than the maximum APRB drawdown of -4.59%. Use the drawdown chart below to compare losses from any high point for CPSF and APRB.

Drawdown Indicators

	CPSF	APRB	Difference
Max Drawdown Largest peak-to-trough decline	-2.89%	-4.59%	+1.70%
Max Drawdown (1Y) Largest decline over 1 year	-1.30%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-0.33%	-0.65%	+0.32%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.27%	—	—

Volatility

Volatility by Period

	CPSF	APRB	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.55%	—	—
Volatility (6M) Calculated over the trailing 6-month period	1.54%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	2.10%	5.71%	-3.61%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.74%	5.71%	-2.97%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.74%	5.71%	-2.97%

CPSF vs. APRB - Expense Ratio Comparison

CPSF has a 0.69% expense ratio, which is higher than APRB's 0.25% expense ratio.

Dividends

CPSF vs. APRB - Dividend Comparison

Neither CPSF nor APRB has paid dividends to shareholders.

Tickers have no history of dividend payments

Frequently Asked Questions

Can I hold both CPSF and APRB in my portfolio?

CPSF and APRB have a correlation of 0.87, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, CPSF or APRB?

On fees, APRB is cheaper at 0.25% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, CPSF or APRB?

APRB is cheaper with a 0.25% expense ratio, compared with 0.69% for CPSF.

Which ETF pays a higher dividend yield, CPSF or APRB?

CPSF and APRB have nearly identical dividend yields, around 0.00%.

What is the main difference between CPSF and APRB?

They also come from different issuers: Calamos and Aptus. Their fees differ too: 0.69% for CPSF and 0.25% for APRB.