RSP vs. CPSP

Last updated Jun 4, 2026

RSP (Invesco S&P 500 Equal Weight ETF) and CPSP (Calamos S&P 500 Structured Alt Protection ETF - April) are both S&P 500 funds. RSP is passively managed, while CPSP is actively managed. Over the past year, RSP returned 19.50% vs 7.13% for CPSP. A 0.67 correlation means they provide meaningful diversification when combined. RSP charges 0.20%/yr vs 0.69%/yr for CPSP.

Performance

RSP vs. CPSP - Performance Comparison

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

Returns By Period

In the year-to-date period, RSP achieves a 9.70% return, which is significantly higher than CPSP's 3.18% return.

RSP

• 1D: -0.38%
• 1M: 3.77%
• YTD: 9.70%
• 6M: 10.18%
• 1Y: 19.50%
• 3Y*: 15.23%
• 5Y*: 8.33%
• 10Y*: 11.86%

CPSP

• 1D: 0.00%
• 1M: 0.60%
• YTD: 3.18%
• 6M: 3.74%
• 1Y: 7.13%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

RSP vs. CPSP - Yearly Performance Comparison

	2026 (YTD)	2025
RSP Invesco S&P 500 Equal Weight ETF	9.70%	11.84%
CPSP Calamos S&P 500 Structured Alt Protection ETF - April	3.18%	5.46%

Correlation

The correlation between RSP and CPSP is 0.64, 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	0.64
Correlation (All Time) Calculated using the full available price history since Apr 2, 2025	0.67

The correlation between RSP and CPSP has been stable across timeframes, ranging from 0.64 to 0.67 - a consistent structural relationship.

Return for Risk

RSP vs. CPSP — Risk / Return Rank

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

RSP

RSP Risk / Return Rank: 49
RSP Sharpe Ratio Rank: 48
RSP Sortino Ratio Rank: 49
RSP Omega Ratio Rank: 46
RSP Calmar Ratio Rank: 50
RSP Martin Ratio Rank: 54

CPSP

CPSP Risk / Return Rank: 98
CPSP Sharpe Ratio Rank: 98
CPSP Sortino Ratio Rank: 99
CPSP Omega Ratio Rank: 98
CPSP Calmar Ratio Rank: 98
CPSP Martin Ratio Rank: 99

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.

RSP vs. CPSP - Risk-Adjusted Trends Comparison

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

	RSP	CPSP	Difference
Sharpe ratio Return per unit of total volatility	1.70	5.08	-3.38
Sortino ratio Return per unit of downside risk	2.47	9.15	-6.68
Omega ratio Gain probability vs. loss probability	1.30	2.31	-1.01
Calmar ratio Return relative to maximum drawdown	2.49	19.11	-16.61
Martin ratio Return relative to average drawdown	9.48	96.35	-86.87
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

RSP vs. CPSP - Sharpe Ratio Comparison

The current RSP Sharpe Ratio is 1.70, which is lower than the CPSP Sharpe Ratio of 5.08. The chart below compares the historical Sharpe Ratios of RSP and CPSP, 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

	RSP	CPSP	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.70	5.08	-3.38
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.52	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.65	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.57	3.17	-2.60

Drawdowns

RSP vs. CPSP - Drawdown Comparison

The maximum RSP drawdown since its inception was -59.92%, which is greater than CPSP's maximum drawdown of -1.73%. Use the drawdown chart below to compare losses from any high point for RSP and CPSP.

Drawdown Indicators

	RSP	CPSP	Difference
Max Drawdown Largest peak-to-trough decline	-59.92%	-1.73%	-58.19%
Max Drawdown (1Y) Largest decline over 1 year	-7.85%	-0.37%	-7.48%
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	-0.38%	0.00%	-0.38%
Average Drawdown Average peak-to-trough decline	-6.65%	-0.08%	-6.57%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.06%	0.07%	+1.99%

Volatility

RSP vs. CPSP - Volatility Comparison

Invesco S&P 500 Equal Weight ETF (RSP) has a higher volatility of 2.56% compared to Calamos S&P 500 Structured Alt Protection ETF - April (CPSP) at 0.32%. This indicates that RSP's price experiences larger fluctuations and is considered to be riskier than CPSP based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	RSP	CPSP	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.56%	0.32%	+2.24%
Volatility (6M) Calculated over the trailing 6-month period	8.29%	0.84%	+7.45%
Volatility (1Y) Calculated over the trailing 1-year period	11.56%	1.42%	+10.14%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.18%	2.37%	+13.81%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.35%	2.37%	+15.98%

RSP vs. CPSP - Expense Ratio Comparison

RSP has a 0.20% expense ratio, which is lower than CPSP's 0.69% expense ratio.

Dividends

RSP vs. CPSP - Dividend Comparison

RSP's dividend yield for the trailing twelve months is around 1.49%, while CPSP has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CPSP Calamos S&P 500 Structured Alt Protection ETF - April	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	1.49%	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 RSP and CPSP in my portfolio?

RSP and CPSP have a correlation of 0.64, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, RSP or CPSP?

RSP has higher volatility (2.56%) compared to CPSP (0.32%). In terms of maximum drawdown, RSP dropped -59.92% vs CPSP's -1.73%.

Which ETF is better, RSP or CPSP?

On 1-year performance, RSP leads with 19.50% vs 7.13% for CPSP. On fees, RSP is cheaper at 0.20% per year. On volatility, CPSP has been the lower-risk option at 0.32%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, RSP or CPSP?

Over the 1-year period, RSP has performed better with a 19.50% return vs 7.13%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, RSP or CPSP?

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

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

RSP has the higher dividend yield at 1.49%, compared with 0.00% for CPSP.

What is the main difference between RSP and CPSP?

They also come from different issuers: Invesco and Calamos. Their fees differ too: 0.20% for RSP and 0.69% for CPSP.

Which has better risk-adjusted returns?

CPSP currently has the higher Sharpe Ratio (5.08 vs 1.70), 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.