CISIX vs. OAKMX

Last updated Jun 24, 2026

CISIX (Calvert US Large-Cap Core Responsible Index Fund) and OAKMX (Oakmark Fund Investor Class) are both mutual funds - CISIX is a Large Cap Blend Equities fund managed by Calvert Research and Management, while OAKMX is a Large Cap Value Equities fund actively managed by Oakmark. Over the past 10 years, CISIX returned 15.95%/yr vs 13.78%/yr for OAKMX. Their correlation of 0.89 suggests significant overlap in exposure. CISIX charges 0.24%/yr vs 0.89%/yr for OAKMX.

Performance

CISIX vs. OAKMX - Performance Comparison

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

Returns By Period

In the year-to-date period, CISIX achieves a 12.08% return, which is significantly higher than OAKMX's -2.01% return. Over the past 10 years, CISIX has outperformed OAKMX with an annualized return of 15.95%, while OAKMX has yielded a comparatively lower 13.78% annualized return.

CISIX

• 1D: -0.19%
• 1M: 1.67%
• YTD: 12.08%
• 6M: 11.13%
• 1Y: 28.10%
• 3Y*: 21.41%
• 5Y*: 12.49%
• 10Y*: 15.95%

OAKMX

• 1D: 0.00%
• 1M: -1.03%
• YTD: -2.01%
• 6M: -2.54%
• 1Y: 8.70%
• 3Y*: 14.33%
• 5Y*: 9.77%
• 10Y*: 13.78%

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

CISIX vs. OAKMX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CISIX Calvert US Large-Cap Core Responsible Index Fund	12.08%	15.90%	24.14%	27.27%	-21.68%	25.63%	26.12%	32.81%	-4.08%	21.18%
OAKMX Oakmark Fund Investor Class	-2.01%	14.13%	16.02%	30.92%	-13.38%	34.85%	12.90%	27.14%	-12.76%	21.12%

Correlation

The correlation between CISIX and OAKMX is 0.63, 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	0.63
Correlation (3Y) Calculated over the trailing 3-year period	0.71
Correlation (5Y) Calculated over the trailing 5-year period	0.81
Correlation (10Y) Calculated over the trailing 10-year period	0.82
Correlation (All Time) Calculated using the full available price history since Jun 30, 2000	0.89

Over the past year, the correlation between CISIX and OAKMX has dropped to 0.63 - well below their long-term average of 0.89, suggesting their price drivers have been diverging.

Return for Risk

CISIX vs. OAKMX — Risk / Return Rank

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

CISIX

CISIX Risk / Return Rank: 68
CISIX Sharpe Ratio Rank: 70
CISIX Sortino Ratio Rank: 64
CISIX Omega Ratio Rank: 62
CISIX Calmar Ratio Rank: 68
CISIX Martin Ratio Rank: 78

OAKMX

OAKMX Risk / Return Rank: 11
OAKMX Sharpe Ratio Rank: 9
OAKMX Sortino Ratio Rank: 9
OAKMX Omega Ratio Rank: 8
OAKMX Calmar Ratio Rank: 15
OAKMX Martin Ratio Rank: 12

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.

CISIX vs. OAKMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Calvert US Large-Cap Core Responsible Index Fund (CISIX) and Oakmark Fund Investor Class (OAKMX). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	CISIX	OAKMX	Difference
Sharpe ratio: Return per unit of total volatility	2.24	0.68	+1.55
Sortino ratio: Return per unit of downside risk	3.06	1.07	+1.99
Omega ratio: Gain probability vs. loss probability	1.40	1.13	+0.27
Calmar ratio: Return relative to maximum drawdown	3.02	1.29	+1.73
Martin ratio: Return relative to average drawdown	13.63	3.17	+10.45

CISIX vs. OAKMX - Sharpe Ratio Comparison

The current CISIX Sharpe Ratio is 2.24, which is higher than the OAKMX Sharpe Ratio of 0.68. The chart below compares the historical Sharpe Ratios of CISIX and OAKMX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

CISIX vs. OAKMX - Drawdown Comparison

The maximum CISIX drawdown since its inception was -59.36%, which is greater than OAKMX's maximum drawdown of -56.19%. Use the drawdown chart below to compare losses from any high point for CISIX and OAKMX.

Drawdown Indicators

	CISIX	OAKMX	Difference
Max Drawdown Largest peak-to-trough decline	-59.36%	-56.19%	-3.17%
Max Drawdown (1Y) Largest decline over 1 year	-9.72%	-6.98%	-2.74%
Max Drawdown (3Y) Largest decline over 3 years	-19.94%	-17.05%	-2.89%
Max Drawdown (5Y) Largest decline over 5 years	-27.37%	-23.68%	-3.69%
Max Drawdown (10Y) Largest decline over 10 years	-32.82%	-41.43%	+8.61%
Current Drawdown Current decline from peak	-0.90%	-4.52%	+3.62%
Average Drawdown Average peak-to-trough decline	-14.26%	-6.39%	-7.87%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.15%	2.84%	-0.69%

Volatility

CISIX vs. OAKMX - Volatility Comparison

Calvert US Large-Cap Core Responsible Index Fund (CISIX) has a higher volatility of 4.93% compared to Oakmark Fund Investor Class (OAKMX) at 3.77%. This indicates that CISIX's price experiences larger fluctuations and is considered to be riskier than OAKMX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CISIX	OAKMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.93%	3.77%	+1.16%
Volatility (6M) Calculated over the trailing 6-month period	10.50%	9.44%	+1.06%
Volatility (1Y) Calculated over the trailing 1-year period	13.16%	13.20%	-0.04%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.88%	18.28%	-0.40%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.62%	20.41%	-1.79%

CISIX vs. OAKMX - Expense Ratio Comparison

CISIX has a 0.24% expense ratio, which is lower than OAKMX's 0.89% expense ratio.

Dividends

CISIX vs. OAKMX - Dividend Comparison

CISIX's dividend yield for the trailing twelve months is around 4.81%, more than OAKMX's 0.94% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CISIX Calvert US Large-Cap Core Responsible Index Fund	4.81%	5.39%	1.77%	1.02%	1.17%	1.02%	0.94%	1.14%	4.33%	2.41%	3.77%	7.62%
OAKMX Oakmark Fund Investor Class	0.94%	0.92%	1.12%	1.02%	0.92%	1.94%	0.17%	8.33%	8.13%	4.06%	2.58%	1.43%

Frequently Asked Questions

Can I hold both CISIX and OAKMX in my portfolio?

CISIX and OAKMX have a correlation of 0.63, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CISIX or OAKMX?

CISIX has higher volatility (4.93%) compared to OAKMX (3.77%). In terms of maximum drawdown, CISIX dropped -59.36% vs OAKMX's -56.19%.

Which has better risk-adjusted returns?

CISIX currently has the higher Sharpe Ratio (2.24 vs 0.68), 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.