STFAX vs. GFFFX

Last updated Jun 4, 2026

STFAX (State Street Equity 500 Index Fund) and GFFFX (American Funds The Growth Fund of America) are both mutual funds - STFAX is a Large Cap Blend Equities fund managed by State Street, while GFFFX is a Large Cap Growth Equities fund managed by American Funds. Over the past 10 years, STFAX returned -8.31%/yr vs 16.22%/yr for GFFFX. Their correlation of 0.95 suggests significant overlap in exposure. STFAX charges 0.17%/yr vs 0.40%/yr for GFFFX.

Performance

STFAX vs. GFFFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in State Street Equity 500 Index Fund (STFAX) and American Funds The Growth Fund of America (GFFFX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, STFAX achieves a 11.63% return, which is significantly higher than GFFFX's 10.19% return. Over the past 10 years, STFAX has underperformed GFFFX with an annualized return of -8.31%, while GFFFX has yielded a comparatively higher 16.22% annualized return.

STFAX

• 1D: 0.13%
• 1M: 5.78%
• YTD: 11.63%
• 6M: 11.65%
• 1Y: 28.74%
• 3Y*: 22.54%
• 5Y*: 14.07%
• 10Y*: -8.31%

GFFFX

• 1D: -0.32%
• 1M: 6.84%
• YTD: 10.19%
• 6M: 9.81%
• 1Y: 26.45%
• 3Y*: 25.40%
• 5Y*: 12.74%
• 10Y*: 16.22%

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

STFAX vs. GFFFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
STFAX State Street Equity 500 Index Fund	11.63%	17.63%	24.80%	26.09%	-18.28%	28.31%	-88.19%	31.13%	-4.52%	21.43%
GFFFX American Funds The Growth Fund of America	10.19%	19.96%	28.28%	37.51%	-30.61%	19.55%	38.16%	28.43%	-2.96%	26.38%

Correlation

The correlation between STFAX and GFFFX is 0.95, 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	0.95
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (5Y) Calculated over the trailing 5-year period	0.95
Correlation (10Y) Calculated over the trailing 10-year period	0.94
Correlation (All Time) Calculated using the full available price history since Jan 5, 2009	0.95

The correlation between STFAX and GFFFX has been stable across timeframes, ranging from 0.94 to 0.95 - a consistent structural relationship.

Return for Risk

STFAX vs. GFFFX — Risk / Return Rank

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

STFAX

STFAX Risk / Return Rank: 72
STFAX Sharpe Ratio Rank: 74
STFAX Sortino Ratio Rank: 66
STFAX Omega Ratio Rank: 66
STFAX Calmar Ratio Rank: 73
STFAX Martin Ratio Rank: 82

GFFFX

GFFFX Risk / Return Rank: 34
GFFFX Sharpe Ratio Rank: 38
GFFFX Sortino Ratio Rank: 35
GFFFX Omega Ratio Rank: 36
GFFFX Calmar Ratio Rank: 28
GFFFX Martin Ratio Rank: 34

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.

STFAX vs. GFFFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for State Street Equity 500 Index Fund (STFAX) and American Funds The Growth Fund of America (GFFFX). 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.

	STFAX	GFFFX	Difference
Sharpe ratio: Return per unit of total volatility	2.50	1.79	+0.71
Sortino ratio: Return per unit of downside risk	3.40	2.45	+0.95
Omega ratio: Gain probability vs. loss probability	1.45	1.32	+0.13
Calmar ratio: Return relative to maximum drawdown	3.33	1.97	+1.35
Martin ratio: Return relative to average drawdown	15.53	7.70	+7.82
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

STFAX vs. GFFFX - Sharpe Ratio Comparison

The current STFAX Sharpe Ratio is 2.50, which is higher than the GFFFX Sharpe Ratio of 1.79. The chart below compares the historical Sharpe Ratios of STFAX and GFFFX, 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

	STFAX	GFFFX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.50	1.79	+0.71
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.84	0.63	+0.21
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.25	0.83	-1.07
Sharpe Ratio (All Time) Calculated using the full available price history	-0.05	0.81	-0.86

Drawdowns

STFAX vs. GFFFX - Drawdown Comparison

The maximum STFAX drawdown since its inception was -91.92%, which is greater than GFFFX's maximum drawdown of -36.26%. Use the drawdown chart below to compare losses from any high point for STFAX and GFFFX.

Drawdown Indicators

	STFAX	GFFFX	Difference
Max Drawdown Largest peak-to-trough decline	-91.92%	-36.26%	-55.66%
Max Drawdown (1Y) Largest decline over 1 year	-8.91%	-13.74%	+4.83%
Max Drawdown (3Y) Largest decline over 3 years	-18.76%	-21.55%	+2.79%
Max Drawdown (5Y) Largest decline over 5 years	-24.57%	-36.26%	+11.69%
Max Drawdown (10Y) Largest decline over 10 years	-91.92%	-36.26%	-55.66%
Current Drawdown Current decline from peak	-75.64%	-0.32%	-75.32%
Average Drawdown Average peak-to-trough decline	-29.65%	-5.57%	-24.08%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.90%	3.51%	-1.61%

Volatility

STFAX vs. GFFFX - Volatility Comparison

The current volatility for State Street Equity 500 Index Fund (STFAX) is 2.82%, while American Funds The Growth Fund of America (GFFFX) has a volatility of 3.67%. This indicates that STFAX experiences smaller price fluctuations and is considered to be less risky than GFFFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	STFAX	GFFFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.82%	3.67%	-0.85%
Volatility (6M) Calculated over the trailing 6-month period	8.96%	11.66%	-2.70%
Volatility (1Y) Calculated over the trailing 1-year period	11.85%	15.16%	-3.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.88%	20.25%	-3.37%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	33.66%	19.69%	+13.97%

STFAX vs. GFFFX - Expense Ratio Comparison

STFAX has a 0.17% expense ratio, which is lower than GFFFX's 0.40% expense ratio.

Dividends

STFAX vs. GFFFX - Dividend Comparison

STFAX's dividend yield for the trailing twelve months is around 1.15%, less than GFFFX's 9.94% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
GFFFX American Funds The Growth Fund of America	9.94%	10.95%	9.23%	7.64%	4.32%	8.42%	4.51%	7.38%	12.29%	7.27%	6.87%	9.13%
STFAX State Street Equity 500 Index Fund	1.15%	1.29%	1.47%	1.63%	2.01%	2.61%	1.71%	4.28%	5.02%	5.78%	1.92%	1.69%

Frequently Asked Questions

Can I hold both STFAX and GFFFX in my portfolio?

With a correlation of 0.95, STFAX and GFFFX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, STFAX or GFFFX?

GFFFX has higher volatility (3.67%) compared to STFAX (2.82%). In terms of maximum drawdown, STFAX dropped -91.92% vs GFFFX's -36.26%.

Which has better risk-adjusted returns?

STFAX currently has the higher Sharpe Ratio (2.50 vs 1.79), 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.