COIIX vs. CISIX

Last updated Jun 4, 2026

COIIX (Calvert International Opportunities Fund) and CISIX (Calvert US Large-Cap Core Responsible Index Fund) are both mutual funds - COIIX is a Foreign Small & Mid Cap Equities fund managed by Calvert Research and Management, while CISIX is a Large Cap Blend Equities fund managed by Calvert Research and Management. Over the past 10 years, COIIX returned 6.51%/yr vs 15.63%/yr for CISIX. A 0.72 correlation means they provide meaningful diversification when combined. COIIX charges 1.06%/yr vs 0.24%/yr for CISIX.

Performance

COIIX vs. CISIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Calvert International Opportunities Fund (COIIX) and Calvert US Large-Cap Core Responsible Index Fund (CISIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, COIIX achieves a 6.38% return, which is significantly lower than CISIX's 13.10% return. Over the past 10 years, COIIX has underperformed CISIX with an annualized return of 6.51%, while CISIX has yielded a comparatively higher 15.63% annualized return.

COIIX

• 1D: 0.00%
• 1M: 2.54%
• YTD: 6.38%
• 6M: 7.98%
• 1Y: 8.04%
• 3Y*: 8.19%
• 5Y*: 0.47%
• 10Y*: 6.51%

CISIX

• 1D: 0.24%
• 1M: 6.59%
• YTD: 13.10%
• 6M: 12.90%
• 1Y: 30.17%
• 3Y*: 22.48%
• 5Y*: 13.13%
• 10Y*: 15.63%

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

COIIX vs. CISIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
COIIX Calvert International Opportunities Fund	6.38%	13.80%	-1.48%	12.95%	-26.69%	13.97%	14.05%	26.09%	-14.57%	38.55%
CISIX Calvert US Large-Cap Core Responsible Index Fund	13.10%	15.90%	24.14%	27.27%	-21.68%	25.63%	26.12%	32.81%	-4.08%	21.18%

Correlation

The correlation between COIIX and CISIX 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 (3Y) Calculated over the trailing 3-year period	0.70
Correlation (5Y) Calculated over the trailing 5-year period	0.75
Correlation (10Y) Calculated over the trailing 10-year period	0.74
Correlation (All Time) Calculated using the full available price history since Jun 1, 2007	0.72

The correlation between COIIX and CISIX has been stable across timeframes, ranging from 0.70 to 0.75 - a consistent structural relationship.

Return for Risk

COIIX vs. CISIX — Risk / Return Rank

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

COIIX

COIIX Risk / Return Rank: 6
COIIX Sharpe Ratio Rank: 6
COIIX Sortino Ratio Rank: 6
COIIX Omega Ratio Rank: 6
COIIX Calmar Ratio Rank: 6
COIIX Martin Ratio Rank: 7

CISIX

CISIX Risk / Return Rank: 70
CISIX Sharpe Ratio Rank: 74
CISIX Sortino Ratio Rank: 67
CISIX Omega Ratio Rank: 63
CISIX Calmar Ratio Rank: 69
CISIX 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.

COIIX vs. CISIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Calvert International Opportunities Fund (COIIX) and Calvert US Large-Cap Core Responsible Index Fund (CISIX). 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.

	COIIX	CISIX	Difference
Sharpe ratio: Return per unit of total volatility	0.52	2.50	-1.97
Sortino ratio: Return per unit of downside risk	0.84	3.42	-2.58
Omega ratio: Gain probability vs. loss probability	1.10	1.44	-0.34
Calmar ratio: Return relative to maximum drawdown	0.56	3.21	-2.65
Martin ratio: Return relative to average drawdown	1.98	14.79	-12.81
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

COIIX vs. CISIX - Sharpe Ratio Comparison

The current COIIX Sharpe Ratio is 0.52, which is lower than the CISIX Sharpe Ratio of 2.50. The chart below compares the historical Sharpe Ratios of COIIX and CISIX, 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

	COIIX	CISIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.52	2.50	-1.97
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.03	0.74	-0.71
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.38	0.84	-0.46
Sharpe Ratio (All Time) Calculated using the full available price history	0.23	0.39	-0.16

Drawdowns

COIIX vs. CISIX - Drawdown Comparison

The maximum COIIX drawdown since its inception was -57.27%, roughly equal to the maximum CISIX drawdown of -59.36%. Use the drawdown chart below to compare losses from any high point for COIIX and CISIX.

Drawdown Indicators

	COIIX	CISIX	Difference
Max Drawdown Largest peak-to-trough decline	-57.27%	-59.36%	+2.09%
Max Drawdown (1Y) Largest decline over 1 year	-12.74%	-9.72%	-3.02%
Max Drawdown (3Y) Largest decline over 3 years	-17.12%	-19.94%	+2.82%
Max Drawdown (5Y) Largest decline over 5 years	-40.36%	-27.37%	-12.99%
Max Drawdown (10Y) Largest decline over 10 years	-40.36%	-32.82%	-7.54%
Current Drawdown Current decline from peak	-4.78%	0.00%	-4.78%
Average Drawdown Average peak-to-trough decline	-14.98%	-14.29%	-0.69%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.62%	2.11%	+1.51%

Volatility

COIIX vs. CISIX - Volatility Comparison

Calvert International Opportunities Fund (COIIX) has a higher volatility of 3.56% compared to Calvert US Large-Cap Core Responsible Index Fund (CISIX) at 3.33%. This indicates that COIIX's price experiences larger fluctuations and is considered to be riskier than CISIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	COIIX	CISIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.56%	3.33%	+0.23%
Volatility (6M) Calculated over the trailing 6-month period	11.03%	9.66%	+1.37%
Volatility (1Y) Calculated over the trailing 1-year period	13.76%	12.51%	+1.25%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.97%	17.78%	-0.81%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.00%	18.57%	-1.57%

COIIX vs. CISIX - Expense Ratio Comparison

COIIX has a 1.06% expense ratio, which is higher than CISIX's 0.24% expense ratio.

Dividends

COIIX vs. CISIX - Dividend Comparison

COIIX's dividend yield for the trailing twelve months is around 3.28%, less than CISIX's 4.77% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CISIX Calvert US Large-Cap Core Responsible Index Fund	4.77%	5.39%	1.77%	1.02%	1.17%	1.02%	0.94%	1.14%	4.33%	2.41%	3.77%	7.62%
COIIX Calvert International Opportunities Fund	3.28%	3.49%	3.24%	1.77%	0.61%	7.67%	0.78%	1.32%	9.82%	7.19%	1.52%	4.53%

Frequently Asked Questions

Can I hold both COIIX and CISIX in my portfolio?

COIIX and CISIX have a correlation of 0.71, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, COIIX or CISIX?

COIIX has higher volatility (3.56%) compared to CISIX (3.33%). In terms of maximum drawdown, COIIX dropped -57.27% vs CISIX's -59.36%.

Which has better risk-adjusted returns?

CISIX currently has the higher Sharpe Ratio (2.50 vs 0.52), 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.