RMFGX vs. FSMDX

Last updated Jun 3, 2026

RMFGX (American Mutual Fund Class R-6) and FSMDX (Fidelity Mid Cap Index Fund) are both mutual funds - RMFGX is a Large Cap Value Equities fund actively managed by American Funds, while FSMDX is a Mid Cap Blend Equities fund managed by Fidelity. Over the past 10 years, RMFGX returned 11.45%/yr vs 11.61%/yr for FSMDX. Their correlation of 0.90 suggests significant overlap in exposure. RMFGX charges 0.27%/yr vs 0.03%/yr for FSMDX.

Performance

RMFGX vs. FSMDX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Mutual Fund Class R-6 (RMFGX) and Fidelity Mid Cap Index Fund (FSMDX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, RMFGX achieves a 6.13% return, which is significantly lower than FSMDX's 12.00% return. Both investments have delivered pretty close results over the past 10 years, with RMFGX having a 11.45% annualized return and FSMDX not far ahead at 11.61%.

RMFGX

• 1D: -0.51%
• 1M: 1.78%
• YTD: 6.13%
• 6M: 6.90%
• 1Y: 17.42%
• 3Y*: 15.62%
• 5Y*: 10.54%
• 10Y*: 11.45%

FSMDX

• 1D: 0.15%
• 1M: 3.17%
• YTD: 12.00%
• 6M: 12.70%
• 1Y: 22.46%
• 3Y*: 17.31%
• 5Y*: 8.15%
• 10Y*: 11.61%

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

RMFGX vs. FSMDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
RMFGX American Mutual Fund Class R-6	6.13%	16.43%	15.28%	9.78%	-4.19%	25.28%	5.15%	21.92%	-2.00%	17.86%
FSMDX Fidelity Mid Cap Index Fund	12.00%	10.58%	15.55%	17.20%	-17.27%	22.56%	17.13%	30.53%	-9.38%	18.04%

Correlation

The correlation between RMFGX and FSMDX is 0.81, 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	0.81
Correlation (3Y) Calculated over the trailing 3-year period	0.86
Correlation (5Y) Calculated over the trailing 5-year period	0.88
Correlation (10Y) Calculated over the trailing 10-year period	0.88
Correlation (All Time) Calculated using the full available price history since Sep 12, 2011	0.90

The correlation between RMFGX and FSMDX has been stable across timeframes, ranging from 0.81 to 0.90 - a consistent structural relationship.

Return for Risk

RMFGX vs. FSMDX — Risk / Return Rank

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

RMFGX

RMFGX Risk / Return Rank: 41
RMFGX Sharpe Ratio Rank: 42
RMFGX Sortino Ratio Rank: 40
RMFGX Omega Ratio Rank: 41
RMFGX Calmar Ratio Rank: 36
RMFGX Martin Ratio Rank: 44

FSMDX

FSMDX Risk / Return Rank: 41
FSMDX Sharpe Ratio Rank: 33
FSMDX Sortino Ratio Rank: 33
FSMDX Omega Ratio Rank: 31
FSMDX Calmar Ratio Rank: 52
FSMDX Martin Ratio Rank: 52

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.

RMFGX vs. FSMDX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Mutual Fund Class R-6 (RMFGX) and Fidelity Mid Cap Index Fund (FSMDX). 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.

	RMFGX	FSMDX	Difference
Sharpe ratio Return per unit of total volatility	1.89	1.69	+0.20
Sortino ratio Return per unit of downside risk	2.65	2.44	+0.21
Omega ratio Gain probability vs. loss probability	1.34	1.30	+0.05
Calmar ratio Return relative to maximum drawdown	2.31	2.79	-0.48
Martin ratio Return relative to average drawdown	9.30	10.78	-1.48
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

RMFGX vs. FSMDX - Sharpe Ratio Comparison

The current RMFGX Sharpe Ratio is 1.89, which is comparable to the FSMDX Sharpe Ratio of 1.69. The chart below compares the historical Sharpe Ratios of RMFGX and FSMDX, 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

	RMFGX	FSMDX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.89	1.69	+0.20
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.85	0.45	+0.40
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.81	0.60	+0.21
Sharpe Ratio (All Time) Calculated using the full available price history	0.83	0.69	+0.13

Drawdowns

RMFGX vs. FSMDX - Drawdown Comparison

The maximum RMFGX drawdown since its inception was -29.79%, smaller than the maximum FSMDX drawdown of -40.35%. Use the drawdown chart below to compare losses from any high point for RMFGX and FSMDX.

Drawdown Indicators

	RMFGX	FSMDX	Difference
Max Drawdown Largest peak-to-trough decline	-29.79%	-40.35%	+10.56%
Max Drawdown (1Y) Largest decline over 1 year	-7.89%	-8.16%	+0.27%
Max Drawdown (3Y) Largest decline over 3 years	-12.90%	-20.92%	+8.02%
Max Drawdown (5Y) Largest decline over 5 years	-15.17%	-26.07%	+10.90%
Max Drawdown (10Y) Largest decline over 10 years	-29.79%	-40.35%	+10.56%
Current Drawdown Current decline from peak	-0.51%	0.00%	-0.51%
Average Drawdown Average peak-to-trough decline	-2.72%	-4.96%	+2.24%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.96%	2.11%	-0.15%

Volatility

RMFGX vs. FSMDX - Volatility Comparison

The current volatility for American Mutual Fund Class R-6 (RMFGX) is 2.29%, while Fidelity Mid Cap Index Fund (FSMDX) has a volatility of 3.28%. This indicates that RMFGX experiences smaller price fluctuations and is considered to be less risky than FSMDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	RMFGX	FSMDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.29%	3.28%	-0.99%
Volatility (6M) Calculated over the trailing 6-month period	7.34%	9.92%	-2.58%
Volatility (1Y) Calculated over the trailing 1-year period	9.50%	13.43%	-3.93%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	12.51%	18.25%	-5.74%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	14.12%	19.32%	-5.20%

RMFGX vs. FSMDX - Expense Ratio Comparison

RMFGX has a 0.27% expense ratio, which is higher than FSMDX's 0.03% 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

RMFGX vs. FSMDX - Dividend Comparison

RMFGX's dividend yield for the trailing twelve months is around 7.43%, more than FSMDX's 0.98% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSMDX Fidelity Mid Cap Index Fund	0.98%	1.10%	2.46%	1.39%	2.07%	3.35%	2.34%	2.86%	2.21%	2.17%	2.23%	2.84%
RMFGX American Mutual Fund Class R-6	7.43%	7.85%	6.59%	4.06%	5.20%	4.88%	2.30%	4.89%	6.75%	6.23%	4.54%	6.84%

Frequently Asked Questions

Can I hold both RMFGX and FSMDX in my portfolio?

RMFGX and FSMDX have a correlation of 0.81, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, RMFGX or FSMDX?

FSMDX has higher volatility (3.28%) compared to RMFGX (2.29%). In terms of maximum drawdown, RMFGX dropped -29.79% vs FSMDX's -40.35%.

Which has better risk-adjusted returns?

RMFGX currently has the higher Sharpe Ratio (1.89 vs 1.69), 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.