GAFFX vs. CHAT

Last updated Apr 1, 2026

Compare and contrast key facts about American Funds Growth Fund of Amer F3 (GAFFX) and Roundhill Generative AI & Technology ETF (CHAT).

GAFFX is managed by American Funds. It was launched on Aug 1, 2008. CHAT is an actively managed fund by Roundhill. It was launched on May 17, 2023.

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.

GAFFX vs. CHAT - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023
GAFFX American Funds Growth Fund of Amer F3	-11.16%	20.09%	28.41%	19.85%
CHAT Roundhill Generative AI & Technology ETF	4.90%	49.85%	30.98%	19.23%

Returns By Period

In the year-to-date period, GAFFX achieves a -11.16% return, which is significantly lower than CHAT's 4.90% return.

GAFFX

• 1D: -0.47%
• 1M: -9.63%
• YTD: -11.16%
• 6M: -9.74%
• 1Y: 13.93%
• 3Y*: 19.23%
• 5Y*: 8.86%
• 10Y*: —

CHAT

• 1D: 4.72%
• 1M: -3.19%
• YTD: 4.90%
• 6M: 3.42%
• 1Y: 82.50%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

GAFFX vs. CHAT - Expense Ratio Comparison

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

CHAT

Roundhill Generative AI & Technology ETF

GAFFX

American Funds Growth Fund of Amer F3

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: 30
GAFFX Sharpe Ratio Rank: 29
GAFFX Sortino Ratio Rank: 32
GAFFX Omega Ratio Rank: 32
GAFFX Calmar Ratio Rank: 28
GAFFX Martin Ratio Rank: 28

CHAT

CHAT Risk / Return Rank: 95
CHAT Sharpe Ratio Rank: 96
CHAT Sortino Ratio Rank: 95
CHAT Omega Ratio Rank: 94
CHAT Calmar Ratio Rank: 97
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	0.66	2.42	-1.76
Sortino ratio Return per unit of downside risk	1.09	3.04	-1.95
Omega ratio Gain probability vs. loss probability	1.16	1.42	-0.26
Calmar ratio Return relative to maximum drawdown	0.79	4.94	-4.15
Martin ratio Return relative to average drawdown	3.04	13.74	-10.71
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 0.66, which is lower than the CHAT Sharpe Ratio of 2.42. The chart below compares the historical Sharpe Ratios of GAFFX and CHAT, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	GAFFX	CHAT	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.66	2.42	-1.76
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.44	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.69	1.27	-0.58

Correlation

The correlation between GAFFX and CHAT is 0.85, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

GAFFX vs. CHAT - Dividend Comparison

GAFFX's dividend yield for the trailing twelve months is around 12.39%, more than CHAT's 2.72% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
GAFFX American Funds Growth Fund of Amer F3	12.39%	11.00%	9.30%	7.71%	4.45%	8.50%	4.58%	7.47%	12.37%	7.36%
CHAT Roundhill Generative AI & Technology ETF	2.72%	2.85%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

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 (5Y) Largest decline over 5 years	-36.19%	—	—
Current Drawdown Current decline from peak	-13.71%	-6.73%	-6.98%
Average Drawdown Average peak-to-trough decline	-7.51%	-5.61%	-1.90%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.55%	5.85%	-2.30%

Volatility

GAFFX vs. CHAT - Volatility Comparison

The current volatility for American Funds Growth Fund of Amer F3 (GAFFX) is 5.47%, while Roundhill Generative AI & Technology ETF (CHAT) has a volatility of 13.21%. 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	5.47%	13.21%	-7.74%
Volatility (6M) Calculated over the trailing 6-month period	11.61%	23.24%	-11.63%
Volatility (1Y) Calculated over the trailing 1-year period	20.76%	34.27%	-13.51%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.17%	29.27%	-9.10%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.19%	29.27%	-9.08%