CPER vs. ERO

Last updated Jun 4, 2026

CPER (United States Copper Index Fund) is Metals fund tracking the SummerHaven Copper Index Total Return, while ERO (Ero Copper Corp) is a stock. Over the past 5 years, CPER returned 7.21%/yr vs 6.13%/yr for ERO. At a 0.48 correlation, their price movements are largely independent.

Performance

CPER vs. ERO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in United States Copper Index Fund (CPER) and Ero Copper Corp (ERO). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, CPER achieves a 12.76% return, which is significantly higher than ERO's 9.47% return.

CPER

• 1D: -2.91%
• 1M: 10.79%
• YTD: 12.76%
• 6M: 19.35%
• 1Y: 29.71%
• 3Y*: 19.71%
• 5Y*: 7.21%
• 10Y*: 10.91%

ERO

• 1D: -3.82%
• 1M: 26.61%
• YTD: 9.47%
• 6M: 22.85%
• 1Y: 111.40%
• 3Y*: 20.41%
• 5Y*: 6.13%
• 10Y*: —

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

CPER vs. ERO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CPER United States Copper Index Fund	12.76%	38.95%	4.23%	4.55%	-15.14%	25.21%	23.90%	6.66%	-21.91%	3.23%
ERO Ero Copper Corp	9.47%	109.87%	-14.63%	14.84%	-10.07%	-5.73%	-10.97%	151.68%	21.41%	52.24%

Correlation

The correlation between CPER and ERO is 0.60, 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	0.60
Correlation (3Y) Calculated over the trailing 3-year period	0.60
Correlation (5Y) Calculated over the trailing 5-year period	0.59
Correlation (All Time) Calculated using the full available price history since Oct 24, 2017	0.48

The correlation between CPER and ERO shifts across timeframes, from 0.48 (all time) to 0.60 (3 years), reflecting how their relationship changes across market environments.

Return for Risk

CPER vs. ERO — Risk / Return Rank

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

CPER

CPER Risk / Return Rank: 24
CPER Sharpe Ratio Rank: 24
CPER Sortino Ratio Rank: 22
CPER Omega Ratio Rank: 30
CPER Calmar Ratio Rank: 25
CPER Martin Ratio Rank: 21

ERO

ERO Risk / Return Rank: 82
ERO Sharpe Ratio Rank: 88
ERO Sortino Ratio Rank: 81
ERO Omega Ratio Rank: 79
ERO Calmar Ratio Rank: 81
ERO Martin Ratio Rank: 79

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.

CPER vs. ERO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for United States Copper Index Fund (CPER) and Ero Copper Corp (ERO). 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.

	CPER	ERO	Difference
Sharpe ratio Return per unit of total volatility	0.87	2.03	-1.16
Sortino ratio Return per unit of downside risk	1.22	2.43	-1.21
Omega ratio Gain probability vs. loss probability	1.20	1.31	-0.10
Calmar ratio Return relative to maximum drawdown	1.20	2.95	-1.75
Martin ratio Return relative to average drawdown	2.50	6.53	-4.03
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CPER vs. ERO - Sharpe Ratio Comparison

The current CPER Sharpe Ratio is 0.87, which is lower than the ERO Sharpe Ratio of 2.03. The chart below compares the historical Sharpe Ratios of CPER and ERO, 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

	CPER	ERO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.87	2.03	-1.16
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.27	0.11	+0.16
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.46	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.13	0.54	-0.40

Drawdowns

CPER vs. ERO - Drawdown Comparison

The maximum CPER drawdown since its inception was -54.04%, smaller than the maximum ERO drawdown of -67.17%. Use the drawdown chart below to compare losses from any high point for CPER and ERO.

Drawdown Indicators

	CPER	ERO	Difference
Max Drawdown Largest peak-to-trough decline	-54.04%	-67.17%	+13.13%
Max Drawdown (1Y) Largest decline over 1 year	-24.77%	-37.97%	+13.20%
Max Drawdown (3Y) Largest decline over 3 years	-24.77%	-59.84%	+35.07%
Max Drawdown (5Y) Largest decline over 5 years	-34.75%	-64.56%	+29.81%
Max Drawdown (10Y) Largest decline over 10 years	-38.42%	—	—
Current Drawdown Current decline from peak	-2.91%	-18.56%	+15.65%
Average Drawdown Average peak-to-trough decline	-25.41%	-27.05%	+1.64%
Ulcer Index Depth and duration of drawdowns from previous peaks	11.93%	17.13%	-5.20%

Volatility

CPER vs. ERO - Volatility Comparison

The current volatility for United States Copper Index Fund (CPER) is 9.73%, while Ero Copper Corp (ERO) has a volatility of 20.07%. This indicates that CPER experiences smaller price fluctuations and is considered to be less risky than ERO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CPER	ERO	Difference
Volatility (1M) Calculated over the trailing 1-month period	9.73%	20.07%	-10.34%
Volatility (6M) Calculated over the trailing 6-month period	22.85%	42.84%	-19.99%
Volatility (1Y) Calculated over the trailing 1-year period	34.48%	55.27%	-20.79%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	26.97%	54.41%	-27.44%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	24.04%	59.08%	-35.04%

Dividends

CPER vs. ERO - Dividend Comparison

Neither CPER nor ERO has paid dividends to shareholders.

Tickers have no history of dividend payments

Frequently Asked Questions

Can I hold both CPER and ERO in my portfolio?

CPER and ERO have a correlation of 0.60, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CPER or ERO?

ERO has higher volatility (20.07%) compared to CPER (9.73%). In terms of maximum drawdown, CPER dropped -54.04% vs ERO's -67.17%.

Which has better risk-adjusted returns?

ERO currently has the higher Sharpe Ratio (2.03 vs 0.87), 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.