GAFFX vs. CHAT

Last updated Jun 4, 2026

GAFFX (American Funds Growth Fund of Amer F3) and CHAT (Roundhill Generative AI & Technology ETF) are both funds - GAFFX is a Large Cap Growth Equities fund managed by American Funds, while CHAT is a Technology Equities fund actively managed by Roundhill. Over the past 3 years, GAFFX returned 25.53%/yr vs 55.51%/yr for CHAT. Their correlation of 0.84 suggests significant overlap in exposure. GAFFX charges 0.30%/yr vs 0.75%/yr for CHAT.

Performance

GAFFX vs. CHAT - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Growth Fund of Amer F3 (GAFFX) and Roundhill Generative AI & Technology ETF (CHAT). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, GAFFX achieves a 10.23% return, which is significantly lower than CHAT's 74.30% return.

GAFFX

• 1D: -0.33%
• 1M: 6.84%
• YTD: 10.23%
• 6M: 9.86%
• 1Y: 26.59%
• 3Y*: 25.53%
• 5Y*: 12.86%
• 10Y*: —

CHAT

• 1D: -0.66%
• 1M: 27.78%
• YTD: 74.30%
• 6M: 73.13%
• 1Y: 144.01%
• 3Y*: 55.51%
• 5Y*: —
• 10Y*: —

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

GAFFX vs. CHAT - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023
GAFFX American Funds Growth Fund of Amer F3	10.23%	20.09%	28.41%	19.85%
CHAT Roundhill Generative AI & Technology ETF	74.30%	49.85%	30.98%	19.23%

Correlation

The correlation between GAFFX and CHAT is 0.79, 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	0.79
Correlation (3Y) Calculated over the trailing 3-year period	0.85
Correlation (All Time) Calculated using the full available price history since May 19, 2023	0.84

The correlation between GAFFX and CHAT has been stable across timeframes, ranging from 0.79 to 0.85 - a consistent structural relationship.

Return for Risk

GAFFX vs. CHAT — Risk / Return Rank

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

GAFFX

GAFFX Risk / Return Rank: 35
GAFFX Sharpe Ratio Rank: 39
GAFFX Sortino Ratio Rank: 35
GAFFX Omega Ratio Rank: 37
GAFFX Calmar Ratio Rank: 28
GAFFX Martin Ratio Rank: 35

CHAT

CHAT Risk / Return Rank: 94
CHAT Sharpe Ratio Rank: 97
CHAT Sortino Ratio Rank: 94
CHAT Omega Ratio Rank: 93
CHAT Calmar Ratio Rank: 96
CHAT Martin Ratio Rank: 94

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.

GAFFX vs. CHAT - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Growth Fund of Amer F3 (GAFFX) and Roundhill Generative AI & Technology ETF (CHAT). 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.

	GAFFX	CHAT	Difference
Sharpe ratio: Return per unit of total volatility	1.80	4.72	-2.92
Sortino ratio: Return per unit of downside risk	2.46	4.86	-2.40
Omega ratio: Gain probability vs. loss probability	1.32	1.65	-0.33
Calmar ratio: Return relative to maximum drawdown	1.99	8.90	-6.91
Martin ratio: Return relative to average drawdown	7.76	26.26	-18.49
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

GAFFX vs. CHAT - Sharpe Ratio Comparison

The current GAFFX Sharpe Ratio is 1.80, which is lower than the CHAT Sharpe Ratio of 4.72. The chart below compares the historical Sharpe Ratios of GAFFX and CHAT, 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

	GAFFX	CHAT	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.80	4.72	-2.92
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.64	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.81	1.98	-1.17

Drawdowns

GAFFX vs. CHAT - Drawdown Comparison

The maximum GAFFX drawdown since its inception was -36.19%, which is greater than CHAT's maximum drawdown of -31.34%. Use the drawdown chart below to compare losses from any high point for GAFFX and CHAT.

Drawdown Indicators

	GAFFX	CHAT	Difference
Max Drawdown Largest peak-to-trough decline	-36.19%	-31.34%	-4.85%
Max Drawdown (1Y) Largest decline over 1 year	-13.71%	-16.28%	+2.57%
Max Drawdown (3Y) Largest decline over 3 years	-21.55%	-31.34%	+9.79%
Max Drawdown (5Y) Largest decline over 5 years	-36.19%	—	—
Current Drawdown Current decline from peak	-0.33%	-0.66%	+0.33%
Average Drawdown Average peak-to-trough decline	-7.41%	-5.35%	-2.06%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.50%	5.51%	-2.01%

Volatility

GAFFX vs. CHAT - Volatility Comparison

The current volatility for American Funds Growth Fund of Amer F3 (GAFFX) is 3.67%, while Roundhill Generative AI & Technology ETF (CHAT) has a volatility of 11.70%. This indicates that GAFFX experiences smaller price fluctuations and is considered to be less risky than CHAT based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	GAFFX	CHAT	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.67%	11.70%	-8.03%
Volatility (6M) Calculated over the trailing 6-month period	11.65%	24.62%	-12.97%
Volatility (1Y) Calculated over the trailing 1-year period	15.16%	30.74%	-15.58%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.25%	29.90%	-9.65%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.14%	29.90%	-9.76%

GAFFX vs. CHAT - Expense Ratio Comparison

GAFFX has a 0.30% expense ratio, which is lower than CHAT's 0.75% expense ratio.

Dividends

GAFFX vs. CHAT - Dividend Comparison

GAFFX's dividend yield for the trailing twelve months is around 9.98%, more than CHAT's 1.64% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
CHAT Roundhill Generative AI & Technology ETF	1.64%	2.85%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
GAFFX American Funds Growth Fund of Amer F3	9.98%	11.00%	9.30%	7.71%	4.45%	8.50%	4.58%	7.47%	12.37%	7.36%

Frequently Asked Questions

Can I hold both GAFFX and CHAT in my portfolio?

GAFFX and CHAT have a correlation of 0.79, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, GAFFX or CHAT?

CHAT has higher volatility (11.70%) compared to GAFFX (3.67%). In terms of maximum drawdown, GAFFX dropped -36.19% vs CHAT's -31.34%.

Which has better risk-adjusted returns?

CHAT currently has the higher Sharpe Ratio (4.72 vs 1.80), 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.