MAMEX vs. MURMX

Last updated Jun 24, 2026

MAMEX (Mutual of America Mid-Cap Equity Index Fund) and MURMX (Mutual of America 2045 Retirement Fund) are both mutual funds - MAMEX is a Mid Cap Blend Equities fund managed by Mutual of America, while MURMX is a Target Retirement Date fund managed by Mutual of America. Over the past 5 years, MAMEX returned 7.92%/yr vs 8.30%/yr for MURMX. Their correlation of 0.91 suggests significant overlap in exposure. MAMEX charges 0.16%/yr vs 0.08%/yr for MURMX.

Performance

MAMEX vs. MURMX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Mutual of America Mid-Cap Equity Index Fund (MAMEX) and Mutual of America 2045 Retirement Fund (MURMX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MAMEX achieves a 15.12% return, which is significantly higher than MURMX's 9.47% return.

MAMEX

• 1D: -0.17%
• 1M: 3.17%
• YTD: 15.12%
• 6M: 13.04%
• 1Y: 25.76%
• 3Y*: 15.38%
• 5Y*: 7.92%
• 10Y*: —

MURMX

• 1D: -0.06%
• 1M: 1.46%
• YTD: 9.47%
• 6M: 8.55%
• 1Y: 22.39%
• 3Y*: 16.20%
• 5Y*: 8.30%
• 10Y*: —

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

MAMEX vs. MURMX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
MAMEX Mutual of America Mid-Cap Equity Index Fund	15.12%	7.40%	13.08%	13.99%	-13.59%	23.35%	925.33%
MURMX Mutual of America 2045 Retirement Fund	9.47%	17.76%	13.85%	15.43%	-16.20%	17.37%	891.67%

Correlation

The correlation between MAMEX and MURMX is 0.85, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.85
Correlation (3Y) Calculated over the trailing 3-year period	0.87
Correlation (5Y) Calculated over the trailing 5-year period	0.91
Correlation (All Time) Calculated using the full available price history since Jan 2, 2020	0.91

The correlation between MAMEX and MURMX has been stable across timeframes, ranging from 0.85 to 0.91 - a consistent structural relationship.

Return for Risk

MAMEX vs. MURMX — Risk / Return Rank

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

MAMEX

MAMEX Risk / Return Rank: 59
MAMEX Sharpe Ratio Rank: 46
MAMEX Sortino Ratio Rank: 50
MAMEX Omega Ratio Rank: 44
MAMEX Calmar Ratio Rank: 79
MAMEX Martin Ratio Rank: 73

MURMX

MURMX Risk / Return Rank: 74
MURMX Sharpe Ratio Rank: 70
MURMX Sortino Ratio Rank: 75
MURMX Omega Ratio Rank: 67
MURMX Calmar Ratio Rank: 73
MURMX Martin Ratio Rank: 84

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.

MAMEX vs. MURMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Mutual of America Mid-Cap Equity Index Fund (MAMEX) and Mutual of America 2045 Retirement Fund (MURMX). 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.

	MAMEX	MURMX	Difference
Sharpe ratio: Return per unit of total volatility	1.84	2.24	-0.40
Sortino ratio: Return per unit of downside risk	2.76	3.32	-0.56
Omega ratio: Gain probability vs. loss probability	1.33	1.41	-0.08
Calmar ratio: Return relative to maximum drawdown	3.41	3.15	+0.26
Martin ratio: Return relative to average drawdown	13.02	14.66	-1.63

MAMEX vs. MURMX - Sharpe Ratio Comparison

The current MAMEX Sharpe Ratio is 1.84, which is comparable to the MURMX Sharpe Ratio of 2.24. The chart below compares the historical Sharpe Ratios of MAMEX and MURMX, 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

MAMEX vs. MURMX - Drawdown Comparison

The maximum MAMEX drawdown since its inception was -42.17%, which is greater than MURMX's maximum drawdown of -32.65%. Use the drawdown chart below to compare losses from any high point for MAMEX and MURMX.

Drawdown Indicators

	MAMEX	MURMX	Difference
Max Drawdown Largest peak-to-trough decline	-42.17%	-32.65%	-9.52%
Max Drawdown (1Y) Largest decline over 1 year	-8.84%	-8.34%	-0.50%
Max Drawdown (3Y) Largest decline over 3 years	-24.11%	-14.67%	-9.44%
Max Drawdown (5Y) Largest decline over 5 years	-24.39%	-23.56%	-0.83%
Current Drawdown Current decline from peak	-0.56%	-0.30%	-0.26%
Average Drawdown Average peak-to-trough decline	-7.43%	-5.44%	-1.99%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.29%	1.72%	+0.57%

Volatility

MAMEX vs. MURMX - Volatility Comparison

Mutual of America Mid-Cap Equity Index Fund (MAMEX) has a higher volatility of 4.37% compared to Mutual of America 2045 Retirement Fund (MURMX) at 3.76%. This indicates that MAMEX's price experiences larger fluctuations and is considered to be riskier than MURMX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MAMEX	MURMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.37%	3.76%	+0.61%
Volatility (6M) Calculated over the trailing 6-month period	12.15%	9.32%	+2.83%
Volatility (1Y) Calculated over the trailing 1-year period	16.39%	11.73%	+4.66%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.05%	16.78%	+5.27%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	381.51%	378.92%	+2.59%

MAMEX vs. MURMX - Expense Ratio Comparison

MAMEX has a 0.16% expense ratio, which is higher than MURMX's 0.08% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

MAMEX vs. MURMX - Dividend Comparison

MAMEX's dividend yield for the trailing twelve months is around 9.67%, more than MURMX's 8.03% yield.

Position	TTM	2025	2024	2023	2022	2021
MAMEX Mutual of America Mid-Cap Equity Index Fund	9.67%	11.85%	9.07%	7.67%	14.01%	12.96%
MURMX Mutual of America 2045 Retirement Fund	8.03%	8.79%	8.17%	2.95%	11.94%	4.69%

Frequently Asked Questions

Can I hold both MAMEX and MURMX in my portfolio?

MAMEX and MURMX have a correlation of 0.85, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MAMEX or MURMX?

MAMEX has higher volatility (4.37%) compared to MURMX (3.76%). In terms of maximum drawdown, MAMEX dropped -42.17% vs MURMX's -32.65%.

Which has better risk-adjusted returns?

MURMX currently has the higher Sharpe Ratio (2.24 vs 1.84), 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.