CPSY vs. APRB

Last updated Jun 4, 2026

CPSY (Calamos S&P 500 Structured Alt Protection ETF - January) and APRB (Aptus April Buffer ETF) are both Defined Outcome funds. Both are actively managed. A 0.77 correlation means they provide meaningful diversification when combined. CPSY charges 0.69%/yr vs 0.25%/yr for APRB.

Performance

CPSY 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 - January (CPSY) 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, CPSY achieves a 2.37% return, which is significantly lower than APRB's 4.77% return.

CPSY

• 1D: 0.02%
• 1M: 0.80%
• YTD: 2.37%
• 6M: 2.92%
• 1Y: 7.60%
• 3Y*: —
• 5Y*: —
• 10Y*: —

APRB

• 1D: -0.11%
• 1M: 1.69%
• YTD: 4.77%
• 6M: 5.32%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

CPSY vs. APRB - Yearly Performance Comparison

	2026 (YTD)	2025
CPSY Calamos S&P 500 Structured Alt Protection ETF - January	2.37%	1.64%
APRB Aptus April Buffer ETF	4.77%	2.48%

Correlation

The correlation between CPSY and APRB is 0.77, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (All Time) Calculated using the full available price history since Oct 15, 2025	0.77

Return for Risk

CPSY vs. APRB — Risk / Return Rank

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

CPSY

CPSY Risk / Return Rank: 95
CPSY Sharpe Ratio Rank: 95
CPSY Sortino Ratio Rank: 97
CPSY Omega Ratio Rank: 96
CPSY Calmar Ratio Rank: 90
CPSY 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.

CPSY 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 - January (CPSY) 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.

	CPSY	APRB	Difference
Sharpe ratio: Return per unit of total volatility	3.74	—	—
Sortino ratio: Return per unit of downside risk	6.06	—	—
Omega ratio: Gain probability vs. loss probability	1.84	—	—
Calmar ratio: Return relative to maximum drawdown	5.67	—	—
Martin ratio: Return relative to average drawdown	29.46	—	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

Sharpe Ratios by Period

	CPSY	APRB	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.74	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	2.14	2.00	+0.14

Drawdowns

CPSY vs. APRB - Drawdown Comparison

The maximum CPSY drawdown since its inception was -3.01%, smaller than the maximum APRB drawdown of -4.59%. Use the drawdown chart below to compare losses from any high point for CPSY and APRB.

Drawdown Indicators

	CPSY	APRB	Difference
Max Drawdown Largest peak-to-trough decline	-3.01%	-4.59%	+1.58%
Max Drawdown (1Y) Largest decline over 1 year	-1.35%	—	—
Current Drawdown Current decline from peak	0.00%	-0.11%	+0.11%
Average Drawdown Average peak-to-trough decline	-0.33%	-0.74%	+0.41%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.26%	—	—

Volatility

Volatility by Period

	CPSY	APRB	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.31%	—	—
Volatility (6M) Calculated over the trailing 6-month period	1.42%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	2.04%	5.98%	-3.94%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.08%	5.98%	-2.90%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.08%	5.98%	-2.90%

CPSY vs. APRB - Expense Ratio Comparison

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

Dividends

CPSY vs. APRB - Dividend Comparison

Neither CPSY nor APRB has paid dividends to shareholders.

Tickers have no history of dividend payments

Frequently Asked Questions

Can I hold both CPSY and APRB in my portfolio?

CPSY and APRB have a correlation of 0.77, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, CPSY 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, CPSY or APRB?

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

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

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

What is the main difference between CPSY and APRB?

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