CMJAX vs. TARKX

Last updated Apr 2, 2026

Compare and contrast key facts about Calvert US Mid-Cap Core Responsible Index Fund Class A (CMJAX) and Tarkio Fund (TARKX).

CMJAX is a passively managed fund by Calvert Research and Management that tracks the performance of the Calvert US Mid-Cap Core Responsible Index. It was launched on Oct 30, 2015. TARKX is managed by Clark Fork Trust. It was launched on Jun 28, 2011.

Performance

CMJAX vs. TARKX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Calvert US Mid-Cap Core Responsible Index Fund Class A (CMJAX) and Tarkio Fund (TARKX). The values are adjusted to include any dividend payments, if applicable.

CMJAX vs. TARKX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CMJAX Calvert US Mid-Cap Core Responsible Index Fund Class A	-0.02%	9.14%	12.24%	15.00%	-19.32%	20.96%	23.72%	30.67%	-9.50%	18.70%
TARKX Tarkio Fund	3.13%	30.18%	21.72%	26.33%	-30.39%	24.41%	27.00%	29.54%	-23.30%	29.04%

Returns By Period

In the year-to-date period, CMJAX achieves a -0.02% return, which is significantly lower than TARKX's 3.13% return. Over the past 10 years, CMJAX has underperformed TARKX with an annualized return of 10.35%, while TARKX has yielded a comparatively higher 13.42% annualized return.

CMJAX

• 1D: 2.84%
• 1M: -6.25%
• YTD: -0.02%
• 6M: 1.32%
• 1Y: 13.70%
• 3Y*: 10.50%
• 5Y*: 4.74%
• 10Y*: 10.35%

TARKX

• 1D: 5.32%
• 1M: -11.53%
• YTD: 3.13%
• 6M: 11.85%
• 1Y: 48.87%
• 3Y*: 21.76%
• 5Y*: 7.94%
• 10Y*: 13.42%

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

CMJAX vs. TARKX - Expense Ratio Comparison

CMJAX has a 0.49% expense ratio, which is lower than TARKX's 1.00% expense ratio.

TARKX

Tarkio Fund

CMJAX

Calvert US Mid-Cap Core Responsible Index Fund Class A

Return for Risk

CMJAX vs. TARKX — Risk / Return Rank

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

CMJAX

CMJAX Risk / Return Rank: 32
CMJAX Sharpe Ratio Rank: 27
CMJAX Sortino Ratio Rank: 29
CMJAX Omega Ratio Rank: 27
CMJAX Calmar Ratio Rank: 35
CMJAX Martin Ratio Rank: 41

TARKX

TARKX Risk / Return Rank: 82
TARKX Sharpe Ratio Rank: 80
TARKX Sortino Ratio Rank: 80
TARKX Omega Ratio Rank: 73
TARKX Calmar Ratio Rank: 91
TARKX Martin Ratio Rank: 85

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.

CMJAX vs. TARKX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Calvert US Mid-Cap Core Responsible Index Fund Class A (CMJAX) and Tarkio Fund (TARKX). 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.

	CMJAX	TARKX	Difference
Sharpe ratio Return per unit of total volatility	0.74	1.55	-0.80
Sortino ratio Return per unit of downside risk	1.18	2.13	-0.96
Omega ratio Gain probability vs. loss probability	1.16	1.29	-0.13
Calmar ratio Return relative to maximum drawdown	1.11	2.82	-1.71
Martin ratio Return relative to average drawdown	4.81	9.30	-4.49
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CMJAX vs. TARKX - Sharpe Ratio Comparison

The current CMJAX Sharpe Ratio is 0.74, which is lower than the TARKX Sharpe Ratio of 1.55. The chart below compares the historical Sharpe Ratios of CMJAX and TARKX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	CMJAX	TARKX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.74	1.55	-0.80
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.26	0.01	+0.24
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.53	0.03	+0.50
Sharpe Ratio (All Time) Calculated using the full available price history	0.54	0.04	+0.50

Correlation

The correlation between CMJAX and TARKX is 0.86, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

CMJAX vs. TARKX - Dividend Comparison

CMJAX's dividend yield for the trailing twelve months is around 4.41%, less than TARKX's 5.34% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CMJAX Calvert US Mid-Cap Core Responsible Index Fund Class A	4.41%	4.40%	0.89%	0.84%	0.80%	2.64%	2.43%	1.57%	2.97%	2.81%	1.86%	0.00%
TARKX Tarkio Fund	5.34%	5.50%	1.51%	2.98%	10.62%	1.40%	0.50%	5.21%	3.34%	1.70%	0.47%	0.36%

Drawdowns

CMJAX vs. TARKX - Drawdown Comparison

The maximum CMJAX drawdown since its inception was -38.09%, smaller than the maximum TARKX drawdown of -95.09%. Use the drawdown chart below to compare losses from any high point for CMJAX and TARKX.

Drawdown Indicators

	CMJAX	TARKX	Difference
Max Drawdown Largest peak-to-trough decline	-38.09%	-95.09%	+57.00%
Max Drawdown (1Y) Largest decline over 1 year	-13.05%	-17.33%	+4.28%
Max Drawdown (5Y) Largest decline over 5 years	-28.22%	-95.09%	+66.87%
Max Drawdown (10Y) Largest decline over 10 years	-38.09%	-95.09%	+57.00%
Current Drawdown Current decline from peak	-6.82%	-91.33%	+84.51%
Average Drawdown Average peak-to-trough decline	-6.43%	-17.02%	+10.59%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.02%	5.25%	-2.23%

Volatility

CMJAX vs. TARKX - Volatility Comparison

The current volatility for Calvert US Mid-Cap Core Responsible Index Fund Class A (CMJAX) is 5.94%, while Tarkio Fund (TARKX) has a volatility of 11.90%. This indicates that CMJAX experiences smaller price fluctuations and is considered to be less risky than TARKX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CMJAX	TARKX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.94%	11.90%	-5.96%
Volatility (6M) Calculated over the trailing 6-month period	10.58%	21.91%	-11.33%
Volatility (1Y) Calculated over the trailing 1-year period	18.98%	32.25%	-13.27%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.58%	600.49%	-581.91%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.53%	424.90%	-405.37%