RFNBX vs. MUHLX

Last updated Jun 4, 2026

RFNBX (American Funds Fundamental Investors Fund Class R2) and MUHLX (Muhlenkamp Fund) are both Large Cap Blend Equities funds. Over the past 10 years, RFNBX returned 13.85%/yr vs 10.79%/yr for MUHLX. Their correlation of 0.86 suggests significant overlap in exposure. RFNBX charges 1.36%/yr vs 1.14%/yr for MUHLX.

Performance

RFNBX vs. MUHLX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Fundamental Investors Fund Class R2 (RFNBX) and Muhlenkamp Fund (MUHLX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, RFNBX achieves a 14.77% return, which is significantly higher than MUHLX's 11.53% return. Over the past 10 years, RFNBX has outperformed MUHLX with an annualized return of 13.85%, while MUHLX has yielded a comparatively lower 10.79% annualized return.

RFNBX

• 1D: 0.01%
• 1M: 5.83%
• YTD: 14.77%
• 6M: 15.70%
• 1Y: 33.49%
• 3Y*: 25.11%
• 5Y*: 14.02%
• 10Y*: 13.85%

MUHLX

• 1D: 0.66%
• 1M: -0.82%
• YTD: 11.53%
• 6M: 11.87%
• 1Y: 23.73%
• 3Y*: 13.92%
• 5Y*: 10.63%
• 10Y*: 10.79%

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

RFNBX vs. MUHLX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
RFNBX American Funds Fundamental Investors Fund Class R2	14.77%	23.22%	21.80%	24.89%	-17.32%	21.49%	12.51%	26.09%	-8.89%	21.82%
MUHLX Muhlenkamp Fund	11.53%	17.82%	3.38%	13.92%	2.89%	28.98%	11.96%	14.39%	-13.29%	18.78%

Correlation

The correlation between RFNBX and MUHLX is 0.62, 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	0.62
Correlation (3Y) Calculated over the trailing 3-year period	0.72
Correlation (5Y) Calculated over the trailing 5-year period	0.76
Correlation (10Y) Calculated over the trailing 10-year period	0.80
Correlation (All Time) Calculated using the full available price history since Jan 3, 2003	0.86

Over the past year, the correlation between RFNBX and MUHLX has dropped to 0.62 - well below their long-term average of 0.86, suggesting their price drivers have been diverging.

Return for Risk

RFNBX vs. MUHLX — Risk / Return Rank

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

RFNBX

RFNBX Risk / Return Rank: 70
RFNBX Sharpe Ratio Rank: 74
RFNBX Sortino Ratio Rank: 65
RFNBX Omega Ratio Rank: 65
RFNBX Calmar Ratio Rank: 68
RFNBX Martin Ratio Rank: 78

MUHLX

MUHLX Risk / Return Rank: 37
MUHLX Sharpe Ratio Rank: 37
MUHLX Sortino Ratio Rank: 33
MUHLX Omega Ratio Rank: 34
MUHLX Calmar Ratio Rank: 40
MUHLX Martin Ratio Rank: 43

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.

RFNBX vs. MUHLX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Fundamental Investors Fund Class R2 (RFNBX) and Muhlenkamp Fund (MUHLX). 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.

	RFNBX	MUHLX	Difference
Sharpe ratio Return per unit of total volatility	2.51	1.76	+0.75
Sortino ratio Return per unit of downside risk	3.37	2.40	+0.97
Omega ratio Gain probability vs. loss probability	1.45	1.31	+0.14
Calmar ratio Return relative to maximum drawdown	3.20	2.40	+0.80
Martin ratio Return relative to average drawdown	14.72	9.10	+5.63
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

RFNBX vs. MUHLX - Sharpe Ratio Comparison

The current RFNBX Sharpe Ratio is 2.51, which is higher than the MUHLX Sharpe Ratio of 1.76. The chart below compares the historical Sharpe Ratios of RFNBX and MUHLX, 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

	RFNBX	MUHLX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.51	1.76	+0.75
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.84	0.73	+0.11
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.78	0.63	+0.15
Sharpe Ratio (All Time) Calculated using the full available price history	0.60	0.52	+0.09

Drawdowns

RFNBX vs. MUHLX - Drawdown Comparison

The maximum RFNBX drawdown since its inception was -53.81%, smaller than the maximum MUHLX drawdown of -62.05%. Use the drawdown chart below to compare losses from any high point for RFNBX and MUHLX.

Drawdown Indicators

	RFNBX	MUHLX	Difference
Max Drawdown Largest peak-to-trough decline	-53.81%	-62.05%	+8.24%
Max Drawdown (1Y) Largest decline over 1 year	-10.78%	-10.23%	-0.55%
Max Drawdown (3Y) Largest decline over 3 years	-18.11%	-18.63%	+0.52%
Max Drawdown (5Y) Largest decline over 5 years	-25.53%	-18.63%	-6.90%
Max Drawdown (10Y) Largest decline over 10 years	-33.96%	-40.85%	+6.89%
Current Drawdown Current decline from peak	0.00%	-3.55%	+3.55%
Average Drawdown Average peak-to-trough decline	-7.24%	-10.77%	+3.53%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.33%	2.69%	-0.36%

Volatility

RFNBX vs. MUHLX - Volatility Comparison

American Funds Fundamental Investors Fund Class R2 (RFNBX) has a higher volatility of 3.69% compared to Muhlenkamp Fund (MUHLX) at 3.17%. This indicates that RFNBX's price experiences larger fluctuations and is considered to be riskier than MUHLX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	RFNBX	MUHLX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.69%	3.17%	+0.52%
Volatility (6M) Calculated over the trailing 6-month period	10.82%	10.95%	-0.13%
Volatility (1Y) Calculated over the trailing 1-year period	13.75%	13.98%	-0.23%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.80%	14.62%	+2.18%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.74%	17.05%	+0.69%

RFNBX vs. MUHLX - Expense Ratio Comparison

RFNBX has a 1.36% expense ratio, which is higher than MUHLX's 1.14% expense ratio.

Dividends

RFNBX vs. MUHLX - Dividend Comparison

RFNBX's dividend yield for the trailing twelve months is around 6.87%, more than MUHLX's 2.99% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MUHLX Muhlenkamp Fund	2.99%	3.34%	0.58%	0.89%	6.80%	7.77%	10.28%	1.26%	14.70%	4.30%	0.00%	11.02%
RFNBX American Funds Fundamental Investors Fund Class R2	6.87%	7.90%	8.19%	5.13%	4.16%	10.27%	0.83%	6.20%	8.38%	6.54%	3.99%	5.32%

Frequently Asked Questions

Can I hold both RFNBX and MUHLX in my portfolio?

RFNBX and MUHLX have a correlation of 0.62, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, RFNBX or MUHLX?

RFNBX has higher volatility (3.69%) compared to MUHLX (3.17%). In terms of maximum drawdown, RFNBX dropped -53.81% vs MUHLX's -62.05%.

Which has better risk-adjusted returns?

RFNBX currently has the higher Sharpe Ratio (2.51 vs 1.76), 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.