CPSU vs. RSP

Last updated Jun 23, 2026

CPSU (Calamos S&P 500 Structured Alt Protection ETF - June) and RSP (Invesco S&P 500 Equal Weight ETF) are both exchange-traded funds - CPSU is a Defined Outcome fund actively managed by Calamos, while RSP is a S&P 500 fund tracking the S&P 500 Equal Weight Index. CPSU is actively managed, while RSP is passively managed. Over the past year, CPSU returned 5.83% vs 20.44% for RSP. A 0.61 correlation means they provide meaningful diversification when combined. CPSU charges 0.69%/yr vs 0.20%/yr for RSP.

Performance

CPSU vs. RSP - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Calamos S&P 500 Structured Alt Protection ETF - June (CPSU) and Invesco S&P 500 Equal Weight ETF (RSP). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, CPSU achieves a 1.92% return, which is significantly lower than RSP's 10.32% return.

CPSU

• 1D: -0.07%
• 1M: -0.23%
• YTD: 1.92%
• 6M: 2.05%
• 1Y: 5.83%
• 3Y*: —
• 5Y*: —
• 10Y*: —

RSP

• 1D: 0.22%
• 1M: 1.86%
• YTD: 10.32%
• 6M: 9.19%
• 1Y: 20.44%
• 3Y*: 15.00%
• 5Y*: 8.85%
• 10Y*: 12.27%

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

CPSU vs. RSP - Yearly Performance Comparison

	2026 (YTD)	2025
CPSU Calamos S&P 500 Structured Alt Protection ETF - June	1.92%	4.35%
RSP Invesco S&P 500 Equal Weight ETF	10.32%	9.93%

Correlation

The correlation between CPSU and RSP is 0.61, 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	0.61
Correlation (All Time) Calculated using the full available price history since Jun 2, 2025	0.61

The correlation between CPSU and RSP has been stable across timeframes, ranging from 0.61 to 0.61 - a consistent structural relationship.

Return for Risk

CPSU vs. RSP — Risk / Return Rank

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

CPSU

CPSU Risk / Return Rank: 94
CPSU Sharpe Ratio Rank: 92
CPSU Sortino Ratio Rank: 95
CPSU Omega Ratio Rank: 96
CPSU Calmar Ratio Rank: 91
CPSU Martin Ratio Rank: 96

RSP

RSP Risk / Return Rank: 53
RSP Sharpe Ratio Rank: 53
RSP Sortino Ratio Rank: 53
RSP Omega Ratio Rank: 49
RSP Calmar Ratio Rank: 54
RSP Martin Ratio Rank: 58

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.

CPSU vs. RSP - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Calamos S&P 500 Structured Alt Protection ETF - June (CPSU) and Invesco S&P 500 Equal Weight ETF (RSP). 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.

	CPSU	RSP	Difference
Sharpe ratio: Return per unit of total volatility	3.09	1.74	+1.35
Sortino ratio: Return per unit of downside risk	4.83	2.50	+2.33
Omega ratio: Gain probability vs. loss probability	1.77	1.30	+0.46
Calmar ratio: Return relative to maximum drawdown	5.69	2.61	+3.08
Martin ratio: Return relative to average drawdown	31.11	9.88	+21.23

CPSU vs. RSP - Sharpe Ratio Comparison

The current CPSU Sharpe Ratio is 3.09, which is higher than the RSP Sharpe Ratio of 1.74. The chart below compares the historical Sharpe Ratios of CPSU and RSP, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

CPSU vs. RSP - Drawdown Comparison

The maximum CPSU drawdown since its inception was -1.03%, smaller than the maximum RSP drawdown of -59.92%. Use the drawdown chart below to compare losses from any high point for CPSU and RSP.

Drawdown Indicators

	CPSU	RSP	Difference
Max Drawdown Largest peak-to-trough decline	-1.03%	-59.92%	+58.89%
Max Drawdown (1Y) Largest decline over 1 year	-1.03%	-7.85%	+6.82%
Max Drawdown (3Y) Largest decline over 3 years	—	-17.81%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-21.38%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-39.04%	—
Current Drawdown Current decline from peak	-0.54%	-1.15%	+0.61%
Average Drawdown Average peak-to-trough decline	-0.09%	-6.64%	+6.55%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.19%	2.07%	-1.88%

Volatility

CPSU vs. RSP - Volatility Comparison

The current volatility for Calamos S&P 500 Structured Alt Protection ETF - June (CPSU) is 0.90%, while Invesco S&P 500 Equal Weight ETF (RSP) has a volatility of 3.61%. This indicates that CPSU experiences smaller price fluctuations and is considered to be less risky than RSP based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CPSU	RSP	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.90%	3.61%	-2.71%
Volatility (6M) Calculated over the trailing 6-month period	1.61%	8.67%	-7.06%
Volatility (1Y) Calculated over the trailing 1-year period	1.90%	11.83%	-9.93%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.88%	16.20%	-14.32%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.88%	18.37%	-16.49%

CPSU vs. RSP - Expense Ratio Comparison

CPSU has a 0.69% expense ratio, which is higher than RSP's 0.20% expense ratio.

Dividends

CPSU vs. RSP - Dividend Comparison

CPSU has not paid dividends to shareholders, while RSP's dividend yield for the trailing twelve months is around 1.87%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CPSU Calamos S&P 500 Structured Alt Protection ETF - June	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
RSP Invesco S&P 500 Equal Weight ETF	1.87%	1.64%	1.52%	1.64%	1.82%	1.28%	1.64%	1.69%	2.02%	1.52%	1.20%	1.70%

Frequently Asked Questions

Can I hold both CPSU and RSP in my portfolio?

CPSU and RSP have a correlation of 0.61, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CPSU or RSP?

RSP has higher volatility (3.61%) compared to CPSU (0.90%). In terms of maximum drawdown, CPSU dropped -1.03% vs RSP's -59.92%.

Which ETF is better, CPSU or RSP?

On 1-year performance, RSP leads with 20.44% vs 5.83% for CPSU. On fees, RSP is cheaper at 0.20% per year. On volatility, CPSU has been the lower-risk option at 0.90%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, CPSU or RSP?

Over the 1-year period, RSP has performed better with a 20.44% return vs 5.83%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, CPSU or RSP?

RSP is cheaper with a 0.20% expense ratio, compared with 0.69% for CPSU.

Which ETF pays a higher dividend yield, CPSU or RSP?

RSP has the higher dividend yield at 1.87%, compared with 0.00% for CPSU.

What is the main difference between CPSU and RSP?

CPSU is categorized as Defined Outcome, while RSP is S&P 500. They also come from different issuers: Calamos and Invesco. Their fees differ too: 0.69% for CPSU and 0.20% for RSP.

Which has better risk-adjusted returns?

CPSU currently has the higher Sharpe Ratio (3.09 vs 1.74), 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.