MURMX vs. LTTIX

Last updated Jun 23, 2026

MURMX (Mutual of America 2045 Retirement Fund) and LTTIX (MFS Lifetime 2025 Fund) are both Target Retirement Date funds. Over the past 5 years, MURMX returned 8.11%/yr vs 3.72%/yr for LTTIX. A 0.76 correlation means they provide meaningful diversification when combined. MURMX charges 0.08%/yr vs 0.00%/yr for LTTIX.

Performance

MURMX vs. LTTIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Mutual of America 2045 Retirement Fund (MURMX) and MFS Lifetime 2025 Fund (LTTIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MURMX achieves a 9.54% return, which is significantly higher than LTTIX's 2.74% return.

MURMX

• 1D: 0.97%
• 1M: 1.52%
• YTD: 9.54%
• 6M: 8.97%
• 1Y: 23.46%
• 3Y*: 15.57%
• 5Y*: 8.11%
• 10Y*: —

LTTIX

• 1D: 0.00%
• 1M: 0.08%
• YTD: 2.74%
• 6M: 2.59%
• 1Y: 8.04%
• 3Y*: 8.33%
• 5Y*: 3.72%
• 10Y*: 6.24%

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

MURMX vs. LTTIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
MURMX Mutual of America 2045 Retirement Fund	9.54%	17.76%	13.85%	15.43%	-16.20%	17.37%	891.67%
LTTIX MFS Lifetime 2025 Fund	2.74%	9.29%	6.73%	10.36%	-12.36%	8.61%	10.61%

Correlation

The correlation between MURMX and LTTIX is 0.74, 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	0.74
Correlation (3Y) Calculated over the trailing 3-year period	0.77
Correlation (5Y) Calculated over the trailing 5-year period	0.74
Correlation (All Time) Calculated using the full available price history since Jan 2, 2020	0.76

The correlation between MURMX and LTTIX has been stable across timeframes, ranging from 0.74 to 0.77 - a consistent structural relationship.

Return for Risk

MURMX vs. LTTIX — Risk / Return Rank

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

MURMX

MURMX Risk / Return Rank: 73
MURMX Sharpe Ratio Rank: 68
MURMX Sortino Ratio Rank: 74
MURMX Omega Ratio Rank: 65
MURMX Calmar Ratio Rank: 71
MURMX Martin Ratio Rank: 84

LTTIX

LTTIX Risk / Return Rank: 61
LTTIX Sharpe Ratio Rank: 64
LTTIX Sortino Ratio Rank: 71
LTTIX Omega Ratio Rank: 69
LTTIX Calmar Ratio Rank: 46
LTTIX Martin Ratio Rank: 56

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.

MURMX vs. LTTIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Mutual of America 2045 Retirement Fund (MURMX) and MFS Lifetime 2025 Fund (LTTIX). 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.

	MURMX	LTTIX	Difference
Sharpe ratio: Return per unit of total volatility	2.22	2.16	+0.06
Sortino ratio: Return per unit of downside risk	3.28	3.20	+0.08
Omega ratio: Gain probability vs. loss probability	1.41	1.42	-0.02
Calmar ratio: Return relative to maximum drawdown	3.12	2.47	+0.64
Martin ratio: Return relative to average drawdown	14.49	10.68	+3.81

MURMX vs. LTTIX - Sharpe Ratio Comparison

The current MURMX Sharpe Ratio is 2.22, which is comparable to the LTTIX Sharpe Ratio of 2.16. The chart below compares the historical Sharpe Ratios of MURMX and LTTIX, 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

MURMX vs. LTTIX - Drawdown Comparison

The maximum MURMX drawdown since its inception was -32.65%, which is greater than LTTIX's maximum drawdown of -19.33%. Use the drawdown chart below to compare losses from any high point for MURMX and LTTIX.

Drawdown Indicators

	MURMX	LTTIX	Difference
Max Drawdown Largest peak-to-trough decline	-32.65%	-19.33%	-13.32%
Max Drawdown (1Y) Largest decline over 1 year	-8.34%	-3.64%	-4.70%
Max Drawdown (3Y) Largest decline over 3 years	-14.67%	-5.77%	-8.90%
Max Drawdown (5Y) Largest decline over 5 years	-23.56%	-16.92%	-6.64%
Max Drawdown (10Y) Largest decline over 10 years	—	-19.33%	—
Current Drawdown Current decline from peak	-0.24%	-0.45%	+0.21%
Average Drawdown Average peak-to-trough decline	-5.44%	-2.68%	-2.76%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.72%	0.84%	+0.88%

Volatility

MURMX vs. LTTIX - Volatility Comparison

Mutual of America 2045 Retirement Fund (MURMX) has a higher volatility of 3.93% compared to MFS Lifetime 2025 Fund (LTTIX) at 1.34%. This indicates that MURMX's price experiences larger fluctuations and is considered to be riskier than LTTIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MURMX	LTTIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.93%	1.34%	+2.59%
Volatility (6M) Calculated over the trailing 6-month period	9.41%	3.32%	+6.09%
Volatility (1Y) Calculated over the trailing 1-year period	11.71%	4.18%	+7.53%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.78%	6.37%	+10.41%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	379.05%	7.24%	+371.81%

MURMX vs. LTTIX - Expense Ratio Comparison

MURMX has a 0.08% expense ratio, which is higher than LTTIX's 0.00% 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

MURMX vs. LTTIX - Dividend Comparison

MURMX's dividend yield for the trailing twelve months is around 8.02%, less than LTTIX's 11.54% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
LTTIX MFS Lifetime 2025 Fund	11.54%	8.13%	7.07%	3.30%	5.88%	7.35%	2.83%	3.68%	4.32%	3.51%	4.03%	1.82%
MURMX Mutual of America 2045 Retirement Fund	8.02%	8.79%	8.17%	2.95%	11.94%	4.69%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both MURMX and LTTIX in my portfolio?

MURMX and LTTIX have a correlation of 0.74, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MURMX or LTTIX?

MURMX has higher volatility (3.93%) compared to LTTIX (1.34%). In terms of maximum drawdown, MURMX dropped -32.65% vs LTTIX's -19.33%.

Which has better risk-adjusted returns?

MURMX currently has the higher Sharpe Ratio (2.22 vs 2.16), 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.