CSTAX vs. GFFFX

Last updated Jun 4, 2026

CSTAX (American Funds College 2027 Fund) and GFFFX (American Funds The Growth Fund of America) are both mutual funds - CSTAX is a Diversified Portfolio fund managed by American Funds, while GFFFX is a Large Cap Growth Equities fund managed by American Funds. Over the past 10 years, CSTAX returned 4.99%/yr vs 16.22%/yr for GFFFX. A 0.73 correlation means they provide meaningful diversification when combined. CSTAX charges 0.41%/yr vs 0.40%/yr for GFFFX.

Performance

CSTAX vs. GFFFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds College 2027 Fund (CSTAX) 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, CSTAX achieves a 1.47% return, which is significantly lower than GFFFX's 10.19% return. Over the past 10 years, CSTAX has underperformed GFFFX with an annualized return of 4.99%, while GFFFX has yielded a comparatively higher 16.22% annualized return.

CSTAX

• 1D: 0.08%
• 1M: 0.65%
• YTD: 1.47%
• 6M: 1.68%
• 1Y: 6.99%
• 3Y*: 6.87%
• 5Y*: 2.83%
• 10Y*: 4.99%

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)

CSTAX vs. GFFFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CSTAX American Funds College 2027 Fund	1.47%	9.00%	5.57%	6.57%	-9.87%	6.52%	7.66%	13.35%	-2.23%	11.77%
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 CSTAX and GFFFX is 0.59, 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	0.59
Correlation (3Y) Calculated over the trailing 3-year period	0.56
Correlation (5Y) Calculated over the trailing 5-year period	0.58
Correlation (10Y) Calculated over the trailing 10-year period	0.68
Correlation (All Time) Calculated using the full available price history since Jan 3, 2013	0.73

The correlation between CSTAX and GFFFX shifts across timeframes, from 0.56 (3 years) to 0.73 (all time), reflecting how their relationship changes across market environments.

Return for Risk

CSTAX vs. GFFFX — Risk / Return Rank

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

CSTAX

CSTAX Risk / Return Rank: 60
CSTAX Sharpe Ratio Rank: 64
CSTAX Sortino Ratio Rank: 71
CSTAX Omega Ratio Rank: 70
CSTAX Calmar Ratio Rank: 47
CSTAX Martin Ratio Rank: 49

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.

CSTAX vs. GFFFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds College 2027 Fund (CSTAX) 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.

	CSTAX	GFFFX	Difference
Sharpe ratio: Return per unit of total volatility	2.34	1.79	+0.56
Sortino ratio: Return per unit of downside risk	3.52	2.45	+1.07
Omega ratio: Gain probability vs. loss probability	1.47	1.32	+0.15
Calmar ratio: Return relative to maximum drawdown	2.61	1.97	+0.64
Martin ratio: Return relative to average drawdown	10.06	7.70	+2.36
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CSTAX vs. GFFFX - Sharpe Ratio Comparison

The current CSTAX Sharpe Ratio is 2.34, which is higher than the GFFFX Sharpe Ratio of 1.79. The chart below compares the historical Sharpe Ratios of CSTAX 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

	CSTAX	GFFFX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.34	1.79	+0.56
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.55	0.63	-0.08
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.86	0.83	+0.04
Sharpe Ratio (All Time) Calculated using the full available price history	0.88	0.81	+0.07

Drawdowns

CSTAX vs. GFFFX - Drawdown Comparison

The maximum CSTAX drawdown since its inception was -14.52%, smaller than the maximum GFFFX drawdown of -36.26%. Use the drawdown chart below to compare losses from any high point for CSTAX and GFFFX.

Drawdown Indicators

	CSTAX	GFFFX	Difference
Max Drawdown Largest peak-to-trough decline	-14.52%	-36.26%	+21.74%
Max Drawdown (1Y) Largest decline over 1 year	-2.72%	-13.74%	+11.02%
Max Drawdown (3Y) Largest decline over 3 years	-4.89%	-21.55%	+16.66%
Max Drawdown (5Y) Largest decline over 5 years	-14.52%	-36.26%	+21.74%
Max Drawdown (10Y) Largest decline over 10 years	-14.52%	-36.26%	+21.74%
Current Drawdown Current decline from peak	-0.40%	-0.32%	-0.08%
Average Drawdown Average peak-to-trough decline	-2.35%	-5.57%	+3.22%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.70%	3.51%	-2.81%

Volatility

CSTAX vs. GFFFX - Volatility Comparison

The current volatility for American Funds College 2027 Fund (CSTAX) is 1.11%, while American Funds The Growth Fund of America (GFFFX) has a volatility of 3.67%. This indicates that CSTAX 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

	CSTAX	GFFFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.11%	3.67%	-2.56%
Volatility (6M) Calculated over the trailing 6-month period	2.32%	11.66%	-9.34%
Volatility (1Y) Calculated over the trailing 1-year period	3.03%	15.16%	-12.13%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.16%	20.25%	-15.09%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.79%	19.69%	-13.90%

CSTAX vs. GFFFX - Expense Ratio Comparison

CSTAX has a 0.41% expense ratio, which is higher than GFFFX's 0.40% expense ratio.

Dividends

CSTAX vs. GFFFX - Dividend Comparison

CSTAX's dividend yield for the trailing twelve months is around 5.19%, less than GFFFX's 9.94% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CSTAX American Funds College 2027 Fund	5.19%	5.26%	3.78%	3.17%	3.40%	7.52%	5.72%	4.00%	4.78%	3.90%	4.34%	4.49%
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%

Frequently Asked Questions

Can I hold both CSTAX and GFFFX in my portfolio?

CSTAX and GFFFX have a correlation of 0.59, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CSTAX or GFFFX?

GFFFX has higher volatility (3.67%) compared to CSTAX (1.11%). In terms of maximum drawdown, CSTAX dropped -14.52% vs GFFFX's -36.26%.

Which has better risk-adjusted returns?

CSTAX currently has the higher Sharpe Ratio (2.34 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.