CPSL vs. CPST

Last updated Apr 15, 2026

CPSL (Calamos Laddered S&P 500 Structured Alt Protection ETF) and CPST (Calamos S&P 500 Structured Alt Protection ETF - September) are both Defined Outcome funds from Calamos. CPSL is actively managed, while CPST is passively managed. Over the past year, CPSL returned 8.85% vs 9.41% for CPST. A 0.73 correlation means they provide meaningful diversification when combined. CPSL charges 0.79%/yr vs 0.69%/yr for CPST.

Performance

CPSL vs. CPST - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Calamos Laddered S&P 500 Structured Alt Protection ETF (CPSL) and Calamos S&P 500 Structured Alt Protection ETF - September (CPST). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, CPSL achieves a 1.31% return, which is significantly higher than CPST's 1.22% return.

CPSL

• 1D: 0.04%
• 1M: 1.21%
• YTD: 1.31%
• 6M: 2.47%
• 1Y: 8.85%
• 3Y*: —
• 5Y*: —
• 10Y*: —

CPST

• 1D: 0.20%
• 1M: 1.13%
• YTD: 1.22%
• 6M: 2.27%
• 1Y: 9.41%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

CPSL vs. CPST - Yearly Performance Comparison

	2026 (YTD)	2025	2024
CPSL Calamos Laddered S&P 500 Structured Alt Protection ETF	1.31%	6.43%	2.32%
CPST Calamos S&P 500 Structured Alt Protection ETF - September	1.22%	6.73%	2.34%

Correlation

The correlation between CPSL and CPST is 0.68, 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	0.68
Correlation (All Time) Calculated using the full available price history since Sep 10, 2024	0.73

The correlation between CPSL and CPST has been stable across timeframes, ranging from 0.68 to 0.73 — a consistent structural relationship.

Return for Risk

CPSL vs. CPST — Risk / Return Rank

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

CPSL

CPSL Risk / Return Rank: 93
CPSL Sharpe Ratio Rank: 88
CPSL Sortino Ratio Rank: 95
CPSL Omega Ratio Rank: 92
CPSL Calmar Ratio Rank: 93
CPSL Martin Ratio Rank: 96

CPST

CPST Risk / Return Rank: 95
CPST Sharpe Ratio Rank: 92
CPST Sortino Ratio Rank: 97
CPST Omega Ratio Rank: 96
CPST Calmar Ratio Rank: 92
CPST Martin Ratio Rank: 96

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.

CPSL vs. CPST - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Calamos Laddered S&P 500 Structured Alt Protection ETF (CPSL) and Calamos S&P 500 Structured Alt Protection ETF - September (CPST). 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.

	CPSL	CPST	Difference
Sharpe ratio Return per unit of total volatility	3.13	3.47	-0.34
Sortino ratio Return per unit of downside risk	5.21	6.00	-0.78
Omega ratio Gain probability vs. loss probability	1.66	1.83	-0.16
Calmar ratio Return relative to maximum drawdown	7.07	6.87	+0.20
Martin ratio Return relative to average drawdown	35.25	33.47	+1.78
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CPSL vs. CPST - Sharpe Ratio Comparison

The current CPSL Sharpe Ratio is 3.13, which is comparable to the CPST Sharpe Ratio of 3.47. The chart below compares the historical Sharpe Ratios of CPSL and CPST, 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

	CPSL	CPST	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.13	3.47	-0.34
Sharpe Ratio (All Time) Calculated using the full available price history	1.85	1.86	-0.01

Drawdowns

CPSL vs. CPST - Drawdown Comparison

The maximum CPSL drawdown since its inception was -3.72%, roughly equal to the maximum CPST drawdown of -3.79%. Use the drawdown chart below to compare losses from any high point for CPSL and CPST.

Drawdown Indicators

	CPSL	CPST	Difference
Max Drawdown Largest peak-to-trough decline	-3.72%	-3.79%	+0.07%
Max Drawdown (1Y) Largest decline over 1 year	-1.18%	-1.42%	+0.24%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-0.36%	-0.37%	+0.01%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.27%	0.29%	-0.02%

Volatility

CPSL vs. CPST - Volatility Comparison

The current volatility for Calamos Laddered S&P 500 Structured Alt Protection ETF (CPSL) is 1.07%, while Calamos S&P 500 Structured Alt Protection ETF - September (CPST) has a volatility of 1.14%. This indicates that CPSL experiences smaller price fluctuations and is considered to be less risky than CPST based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CPSL	CPST	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.07%	1.14%	-0.07%
Volatility (6M) Calculated over the trailing 6-month period	1.70%	1.71%	-0.01%
Volatility (1Y) Calculated over the trailing 1-year period	2.85%	2.73%	+0.12%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.47%	3.49%	-0.02%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.47%	3.49%	-0.02%

CPSL vs. CPST - Expense Ratio Comparison

CPSL has a 0.79% expense ratio, which is higher than CPST's 0.69% expense ratio.

Dividends

CPSL vs. CPST - Dividend Comparison

Neither CPSL nor CPST has paid dividends to shareholders.

Tickers have no history of dividend payments