MURNX vs. LTFIX

Last updated Jun 5, 2026

MURNX (Mutual of America Investment Corporation - 2050 Retirement Fund) and LTFIX (Principal LifeTime 2055 Fund) are both Target Retirement Date funds. Over the past 5 years, MURNX returned 8.26%/yr vs 9.02%/yr for LTFIX. Their correlation of 0.82 suggests significant overlap in exposure. MURNX charges 0.08%/yr vs 0.01%/yr for LTFIX.

Performance

MURNX vs. LTFIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Mutual of America Investment Corporation - 2050 Retirement Fund (MURNX) and Principal LifeTime 2055 Fund (LTFIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MURNX achieves a 9.23% return, which is significantly higher than LTFIX's 8.75% return.

MURNX

• 1D: -0.60%
• 1M: 2.62%
• YTD: 9.23%
• 6M: 9.54%
• 1Y: 23.00%
• 3Y*: 16.45%
• 5Y*: 8.26%
• 10Y*: —

LTFIX

• 1D: -0.83%
• 1M: 2.92%
• YTD: 8.75%
• 6M: 9.13%
• 1Y: 21.71%
• 3Y*: 18.51%
• 5Y*: 9.02%
• 10Y*: 11.50%

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

MURNX vs. LTFIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
MURNX Mutual of America Investment Corporation - 2050 Retirement Fund	9.23%	17.89%	14.37%	15.78%	-16.25%	17.85%	918.18%
LTFIX Principal LifeTime 2055 Fund	8.75%	17.80%	17.28%	20.33%	-18.84%	17.73%	15.56%

Correlation

The correlation between MURNX and LTFIX is 0.87, 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	0.87
Correlation (3Y) Calculated over the trailing 3-year period	0.89
Correlation (5Y) Calculated over the trailing 5-year period	0.82
Correlation (All Time) Calculated using the full available price history since Jan 3, 2020	0.82

The correlation between MURNX and LTFIX has been stable across timeframes, ranging from 0.82 to 0.89 - a consistent structural relationship.

Return for Risk

MURNX vs. LTFIX — Risk / Return Rank

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

MURNX

MURNX Risk / Return Rank: 65
MURNX Sharpe Ratio Rank: 59
MURNX Sortino Ratio Rank: 64
MURNX Omega Ratio Rank: 57
MURNX Calmar Ratio Rank: 66
MURNX Martin Ratio Rank: 79

LTFIX

LTFIX Risk / Return Rank: 45
LTFIX Sharpe Ratio Rank: 41
LTFIX Sortino Ratio Rank: 40
LTFIX Omega Ratio Rank: 41
LTFIX Calmar Ratio Rank: 44
LTFIX Martin Ratio Rank: 57

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.

MURNX vs. LTFIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Mutual of America Investment Corporation - 2050 Retirement Fund (MURNX) and Principal LifeTime 2055 Fund (LTFIX). 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.

	MURNX	LTFIX	Difference
Sharpe ratio: Return per unit of total volatility	2.22	1.85	+0.37
Sortino ratio: Return per unit of downside risk	3.27	2.62	+0.65
Omega ratio: Gain probability vs. loss probability	1.41	1.34	+0.07
Calmar ratio: Return relative to maximum drawdown	3.06	2.52	+0.53
Martin ratio: Return relative to average drawdown	14.46	11.34	+3.13
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MURNX vs. LTFIX - Sharpe Ratio Comparison

The current MURNX Sharpe Ratio is 2.22, which is comparable to the LTFIX Sharpe Ratio of 1.85. The chart below compares the historical Sharpe Ratios of MURNX and LTFIX, 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

	MURNX	LTFIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.22	1.85	+0.37
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.54	0.59	-0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.73	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.17	0.46	-0.29

Drawdowns

MURNX vs. LTFIX - Drawdown Comparison

The maximum MURNX drawdown since its inception was -32.96%, smaller than the maximum LTFIX drawdown of -52.73%. Use the drawdown chart below to compare losses from any high point for MURNX and LTFIX.

Drawdown Indicators

	MURNX	LTFIX	Difference
Max Drawdown Largest peak-to-trough decline	-32.96%	-52.73%	+19.77%
Max Drawdown (1Y) Largest decline over 1 year	-8.50%	-8.71%	+0.21%
Max Drawdown (3Y) Largest decline over 3 years	-15.36%	-15.70%	+0.34%
Max Drawdown (5Y) Largest decline over 5 years	-23.75%	-26.80%	+3.05%
Max Drawdown (10Y) Largest decline over 10 years	—	-33.50%	—
Current Drawdown Current decline from peak	-0.60%	-0.83%	+0.23%
Average Drawdown Average peak-to-trough decline	-5.50%	-7.64%	+2.14%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.72%	1.93%	-0.21%

Volatility

MURNX vs. LTFIX - Volatility Comparison

The current volatility for Mutual of America Investment Corporation - 2050 Retirement Fund (MURNX) is 3.28%, while Principal LifeTime 2055 Fund (LTFIX) has a volatility of 3.46%. This indicates that MURNX experiences smaller price fluctuations and is considered to be less risky than LTFIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MURNX	LTFIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.28%	3.46%	-0.18%
Volatility (6M) Calculated over the trailing 6-month period	9.41%	9.48%	-0.07%
Volatility (1Y) Calculated over the trailing 1-year period	11.71%	11.87%	-0.16%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.23%	15.46%	+1.77%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	381.67%	15.84%	+365.83%

MURNX vs. LTFIX - Expense Ratio Comparison

MURNX has a 0.08% expense ratio, which is higher than LTFIX's 0.01% 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

MURNX vs. LTFIX - Dividend Comparison

MURNX's dividend yield for the trailing twelve months is around 8.52%, more than LTFIX's 8.02% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
LTFIX Principal LifeTime 2055 Fund	8.02%	8.73%	8.47%	4.17%	8.60%	5.83%	3.91%	6.03%	6.60%	3.51%	3.99%	4.51%
MURNX Mutual of America Investment Corporation - 2050 Retirement Fund	8.52%	9.30%	6.49%	3.56%	11.26%	3.72%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both MURNX and LTFIX in my portfolio?

MURNX and LTFIX have a correlation of 0.87, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MURNX or LTFIX?

LTFIX has higher volatility (3.46%) compared to MURNX (3.28%). In terms of maximum drawdown, MURNX dropped -32.96% vs LTFIX's -52.73%.

Which has better risk-adjusted returns?

MURNX currently has the higher Sharpe Ratio (2.22 vs 1.85), 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.