WMFFX vs. FSSNX

Last updated Jun 9, 2026

WMFFX (Washington Mutual Investors Fund Class F-2) and FSSNX (Fidelity Small Cap Index Fund) are both mutual funds - WMFFX is a Large Cap Value Equities fund tracking the S&P 500, while FSSNX is a Small Cap Blend Equities fund tracking the Russell 2000 Index. Both are passively managed. Over the past 10 years, WMFFX returned 12.74%/yr vs 10.69%/yr for FSSNX. Their correlation of 0.82 suggests significant overlap in exposure. WMFFX charges 0.37%/yr vs 0.03%/yr for FSSNX.

Performance

WMFFX vs. FSSNX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Washington Mutual Investors Fund Class F-2 (WMFFX) and Fidelity Small Cap Index Fund (FSSNX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, WMFFX achieves a 4.46% return, which is significantly lower than FSSNX's 14.74% return. Over the past 10 years, WMFFX has outperformed FSSNX with an annualized return of 12.74%, while FSSNX has yielded a comparatively lower 10.69% annualized return.

WMFFX

• 1D: -1.27%
• 1M: 0.30%
• YTD: 4.46%
• 6M: 4.89%
• 1Y: 15.75%
• 3Y*: 17.84%
• 5Y*: 11.59%
• 10Y*: 12.74%

FSSNX

• 1D: -3.48%
• 1M: -0.87%
• YTD: 14.74%
• 6M: 13.12%
• 1Y: 34.70%
• 3Y*: 16.90%
• 5Y*: 5.93%
• 10Y*: 10.69%

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

WMFFX vs. FSSNX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
WMFFX Washington Mutual Investors Fund Class F-2	4.46%	17.42%	19.24%	16.96%	-8.27%	28.71%	7.89%	25.03%	-5.98%	20.23%
FSSNX Fidelity Small Cap Index Fund	14.74%	12.94%	11.71%	17.11%	-20.28%	14.70%	19.99%	25.70%	-11.24%	14.54%

Correlation

The correlation between WMFFX and FSSNX is 0.80, 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	0.80
Correlation (3Y) Calculated over the trailing 3-year period	0.79
Correlation (5Y) Calculated over the trailing 5-year period	0.81
Correlation (10Y) Calculated over the trailing 10-year period	0.80
Correlation (All Time) Calculated using the full available price history since Sep 9, 2011	0.82

The correlation between WMFFX and FSSNX has been stable across timeframes, ranging from 0.79 to 0.82 - a consistent structural relationship.

Return for Risk

WMFFX vs. FSSNX — Risk / Return Rank

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

WMFFX

WMFFX Risk / Return Rank: 36
WMFFX Sharpe Ratio Rank: 35
WMFFX Sortino Ratio Rank: 35
WMFFX Omega Ratio Rank: 35
WMFFX Calmar Ratio Rank: 32
WMFFX Martin Ratio Rank: 43

FSSNX

FSSNX Risk / Return Rank: 53
FSSNX Sharpe Ratio Rank: 45
FSSNX Sortino Ratio Rank: 42
FSSNX Omega Ratio Rank: 38
FSSNX Calmar Ratio Rank: 77
FSSNX Martin Ratio Rank: 63

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.

WMFFX vs. FSSNX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Washington Mutual Investors Fund Class F-2 (WMFFX) and Fidelity Small Cap Index Fund (FSSNX). 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.

	WMFFX	FSSNX	Difference
Sharpe ratio: Return per unit of total volatility	1.58	1.90	-0.32
Sortino ratio: Return per unit of downside risk	2.26	2.63	-0.38
Omega ratio: Gain probability vs. loss probability	1.29	1.31	-0.03
Calmar ratio: Return relative to maximum drawdown	1.97	3.38	-1.41
Martin ratio: Return relative to average drawdown	8.50	11.95	-3.46
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

WMFFX vs. FSSNX - Sharpe Ratio Comparison

The current WMFFX Sharpe Ratio is 1.58, which is comparable to the FSSNX Sharpe Ratio of 1.90. The chart below compares the historical Sharpe Ratios of WMFFX and FSSNX, 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

	WMFFX	FSSNX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.58	1.90	-0.32
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.82	0.26	+0.56
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.78	0.46	+0.33
Sharpe Ratio (All Time) Calculated using the full available price history	0.60	0.53	+0.07

Drawdowns

WMFFX vs. FSSNX - Drawdown Comparison

The maximum WMFFX drawdown since its inception was -47.21%, which is greater than FSSNX's maximum drawdown of -41.72%. Use the drawdown chart below to compare losses from any high point for WMFFX and FSSNX.

Drawdown Indicators

	WMFFX	FSSNX	Difference
Max Drawdown Largest peak-to-trough decline	-47.21%	-41.72%	-5.49%
Max Drawdown (1Y) Largest decline over 1 year	-8.36%	-11.00%	+2.64%
Max Drawdown (3Y) Largest decline over 3 years	-14.64%	-27.45%	+12.81%
Max Drawdown (5Y) Largest decline over 5 years	-18.53%	-31.87%	+13.34%
Max Drawdown (10Y) Largest decline over 10 years	-34.63%	-41.72%	+7.09%
Current Drawdown Current decline from peak	-1.41%	-3.48%	+2.07%
Average Drawdown Average peak-to-trough decline	-5.36%	-8.29%	+2.93%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.93%	3.10%	-1.17%

Volatility

WMFFX vs. FSSNX - Volatility Comparison

The current volatility for Washington Mutual Investors Fund Class F-2 (WMFFX) is 2.54%, while Fidelity Small Cap Index Fund (FSSNX) has a volatility of 6.59%. This indicates that WMFFX experiences smaller price fluctuations and is considered to be less risky than FSSNX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	WMFFX	FSSNX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.54%	6.59%	-4.05%
Volatility (6M) Calculated over the trailing 6-month period	7.92%	14.03%	-6.11%
Volatility (1Y) Calculated over the trailing 1-year period	10.40%	19.52%	-9.12%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.11%	22.64%	-8.53%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.33%	23.47%	-7.14%

WMFFX vs. FSSNX - Expense Ratio Comparison

WMFFX has a 0.37% expense ratio, which is higher than FSSNX's 0.03% expense ratio.

Dividends

WMFFX vs. FSSNX - Dividend Comparison

WMFFX's dividend yield for the trailing twelve months is around 9.87%, more than FSSNX's 0.94% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSSNX Fidelity Small Cap Index Fund	0.94%	1.08%	1.04%	1.43%	1.26%	3.92%	0.94%	2.96%	4.94%	3.37%	2.27%	2.66%
WMFFX Washington Mutual Investors Fund Class F-2	9.87%	10.28%	10.27%	5.92%	6.53%	6.24%	3.26%	6.33%	4.59%	7.43%	6.56%	6.44%

Frequently Asked Questions

Can I hold both WMFFX and FSSNX in my portfolio?

WMFFX and FSSNX have a correlation of 0.80, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, WMFFX or FSSNX?

FSSNX has higher volatility (6.59%) compared to WMFFX (2.54%). In terms of maximum drawdown, WMFFX dropped -47.21% vs FSSNX's -41.72%.

Which has better risk-adjusted returns?

FSSNX currently has the higher Sharpe Ratio (1.90 vs 1.58), 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.