CPSD vs. RSP

Last updated Apr 18, 2026

CPSD (Calamos S&P 500 Structured Alt Protection ETF - December) and RSP (Invesco S&P 500 Equal Weight ETF) are both exchange-traded funds — CPSD 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. CPSD is actively managed, while RSP is passively managed. Over the past year, CPSD returned 10.93% vs 27.00% for RSP. A 0.68 correlation means they provide meaningful diversification when combined. CPSD charges 0.69%/yr vs 0.20%/yr for RSP.

Performance

CPSD 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 - December (CPSD) 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, CPSD achieves a 1.36% return, which is significantly lower than RSP's 6.51% return.

CPSD

• 1D: 0.25%
• 1M: 1.47%
• YTD: 1.36%
• 6M: 3.29%
• 1Y: 10.93%
• 3Y*: —
• 5Y*: —
• 10Y*: —

RSP

• 1D: 1.26%
• 1M: 5.46%
• YTD: 6.51%
• 6M: 8.95%
• 1Y: 27.00%
• 3Y*: 13.60%
• 5Y*: 8.43%
• 10Y*: 11.63%

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

CPSD vs. RSP - Yearly Performance Comparison

	2026 (YTD)	2025	2024
CPSD Calamos S&P 500 Structured Alt Protection ETF - December	1.36%	7.63%	0.04%
RSP Invesco S&P 500 Equal Weight ETF	6.51%	11.21%	-6.04%

Correlation

The correlation between CPSD and RSP is 0.71, 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	0.71
Correlation (All Time) Calculated using the full available price history since Dec 3, 2024	0.68

The correlation between CPSD and RSP has been stable across timeframes, ranging from 0.68 to 0.71 — a consistent structural relationship.

Return for Risk

CPSD vs. RSP — Risk / Return Rank

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

CPSD

CPSD Risk / Return Rank: 94
CPSD Sharpe Ratio Rank: 92
CPSD Sortino Ratio Rank: 96
CPSD Omega Ratio Rank: 95
CPSD Calmar Ratio Rank: 93
CPSD Martin Ratio Rank: 96

RSP

RSP Risk / Return Rank: 55
RSP Sharpe Ratio Rank: 52
RSP Sortino Ratio Rank: 55
RSP Omega Ratio Rank: 51
RSP Calmar Ratio Rank: 57
RSP Martin Ratio Rank: 60

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.

CPSD 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 - December (CPSD) 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.

	CPSD	RSP	Difference
Sharpe ratio Return per unit of total volatility	3.60	2.14	+1.45
Sortino ratio Return per unit of downside risk	5.81	3.11	+2.71
Omega ratio Gain probability vs. loss probability	1.78	1.39	+0.39
Calmar ratio Return relative to maximum drawdown	7.06	3.35	+3.71
Martin ratio Return relative to average drawdown	33.82	12.54	+21.28
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CPSD vs. RSP - Sharpe Ratio Comparison

The current CPSD Sharpe Ratio is 3.60, which is higher than the RSP Sharpe Ratio of 2.14. The chart below compares the historical Sharpe Ratios of CPSD 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.

Sharpe Ratios by Period

	CPSD	RSP	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.60	2.14	+1.45
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.52	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.64	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.88	0.56	+1.31

Drawdowns

CPSD vs. RSP - Drawdown Comparison

The maximum CPSD drawdown since its inception was -3.45%, smaller than the maximum RSP drawdown of -59.92%. Use the drawdown chart below to compare losses from any high point for CPSD and RSP.

Drawdown Indicators

	CPSD	RSP	Difference
Max Drawdown Largest peak-to-trough decline	-3.45%	-59.92%	+56.47%
Max Drawdown (1Y) Largest decline over 1 year	-1.49%	-7.85%	+6.36%
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	0.00%	-0.46%	+0.46%
Average Drawdown Average peak-to-trough decline	-0.51%	-6.68%	+6.17%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.31%	2.10%	-1.79%

Volatility

CPSD vs. RSP - Volatility Comparison

The current volatility for Calamos S&P 500 Structured Alt Protection ETF - December (CPSD) is 1.03%, while Invesco S&P 500 Equal Weight ETF (RSP) has a volatility of 4.40%. This indicates that CPSD 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

	CPSD	RSP	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.03%	4.40%	-3.37%
Volatility (6M) Calculated over the trailing 6-month period	1.96%	8.87%	-6.91%
Volatility (1Y) Calculated over the trailing 1-year period	3.06%	12.72%	-9.66%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.54%	16.23%	-12.69%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.54%	18.36%	-14.82%

CPSD vs. RSP - Expense Ratio Comparison

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

Dividends

CPSD vs. RSP - Dividend Comparison

CPSD has not paid dividends to shareholders, while RSP's dividend yield for the trailing twelve months is around 1.53%.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CPSD Calamos S&P 500 Structured Alt Protection ETF - December	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	1.53%	1.64%	1.52%	1.64%	1.82%	1.28%	1.64%	1.69%	2.02%	1.52%	1.20%	1.70%