FMACX vs. BRK-B

Last updated Jun 5, 2026

FMACX (American Funds AMCAP Fund® Class F-3) is Large Cap Growth Equities fund managed by American Funds, while BRK-B (Berkshire Hathaway Inc.) is a stock. Over the past 5 years, FMACX returned 9.59%/yr vs 10.35%/yr for BRK-B. A 0.52 correlation means they provide meaningful diversification when combined.

Performance

FMACX vs. BRK-B - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds AMCAP Fund® Class F-3 (FMACX) and Berkshire Hathaway Inc. (BRK-B). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FMACX achieves a 5.57% return, which is significantly higher than BRK-B's -4.78% return.

FMACX

• 1D: -0.85%
• 1M: 2.35%
• YTD: 5.57%
• 6M: 5.27%
• 1Y: 20.65%
• 3Y*: 19.86%
• 5Y*: 9.59%
• 10Y*: —

BRK-B

• 1D: 0.69%
• 1M: 2.82%
• YTD: -4.78%
• 6M: -4.89%
• 1Y: -2.52%
• 3Y*: 13.36%
• 5Y*: 10.35%
• 10Y*: 12.93%

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

FMACX vs. BRK-B - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FMACX American Funds AMCAP Fund® Class F-3	5.57%	18.07%	21.49%	31.48%	-28.43%	22.33%	21.81%	26.73%	-4.12%	18.35%
BRK-B Berkshire Hathaway Inc.	-4.78%	10.89%	27.09%	15.46%	3.31%	28.95%	2.37%	10.93%	3.01%	21.15%

Correlation

The correlation between FMACX and BRK-B is 0.05, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.05
Correlation (3Y) Calculated over the trailing 3-year period	0.26
Correlation (5Y) Calculated over the trailing 5-year period	0.43
Correlation (All Time) Calculated using the full available price history since Feb 2, 2017	0.52

Over the past year, the correlation between FMACX and BRK-B has dropped to 0.05 - well below their long-term average of 0.52, suggesting their price drivers have been diverging.

Return for Risk

FMACX vs. BRK-B — Risk / Return Rank

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

FMACX

FMACX Risk / Return Rank: 25
FMACX Sharpe Ratio Rank: 28
FMACX Sortino Ratio Rank: 25
FMACX Omega Ratio Rank: 27
FMACX Calmar Ratio Rank: 19
FMACX Martin Ratio Rank: 26

BRK-B

BRK-B Risk / Return Rank: 31
BRK-B Sharpe Ratio Rank: 34
BRK-B Sortino Ratio Rank: 28
BRK-B Omega Ratio Rank: 27
BRK-B Calmar Ratio Rank: 33
BRK-B Martin Ratio Rank: 32

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.

FMACX vs. BRK-B - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds AMCAP Fund® Class F-3 (FMACX) and Berkshire Hathaway Inc. (BRK-B). 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.

	FMACX	BRK-B	Difference
Sharpe ratio: Return per unit of total volatility	1.46	-0.18	+1.64
Sortino ratio: Return per unit of downside risk	2.06	-0.15	+2.21
Omega ratio: Gain probability vs. loss probability	1.27	0.98	+0.28
Calmar ratio: Return relative to maximum drawdown	1.51	-0.27	+1.78
Martin ratio: Return relative to average drawdown	6.14	-0.57	+6.70
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FMACX vs. BRK-B - Sharpe Ratio Comparison

The current FMACX Sharpe Ratio is 1.46, which is higher than the BRK-B Sharpe Ratio of -0.18. The chart below compares the historical Sharpe Ratios of FMACX and BRK-B, 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

	FMACX	BRK-B	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.46	-0.18	+1.64
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.50	0.61	-0.11
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.67	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.67	0.48	+0.19

Drawdowns

FMACX vs. BRK-B - Drawdown Comparison

The maximum FMACX drawdown since its inception was -36.00%, smaller than the maximum BRK-B drawdown of -53.86%. Use the drawdown chart below to compare losses from any high point for FMACX and BRK-B.

Drawdown Indicators

	FMACX	BRK-B	Difference
Max Drawdown Largest peak-to-trough decline	-36.00%	-53.86%	+17.86%
Max Drawdown (1Y) Largest decline over 1 year	-14.12%	-9.42%	-4.70%
Max Drawdown (3Y) Largest decline over 3 years	-19.69%	-14.95%	-4.74%
Max Drawdown (5Y) Largest decline over 5 years	-36.00%	-26.58%	-9.42%
Max Drawdown (10Y) Largest decline over 10 years	—	-29.57%	—
Current Drawdown Current decline from peak	-1.60%	-11.33%	+9.73%
Average Drawdown Average peak-to-trough decline	-7.34%	-11.07%	+3.73%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.47%	4.46%	-0.99%

Volatility

FMACX vs. BRK-B - Volatility Comparison

American Funds AMCAP Fund® Class F-3 (FMACX) and Berkshire Hathaway Inc. (BRK-B) have volatilities of 3.69% and 3.72%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FMACX	BRK-B	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.69%	3.72%	-0.03%
Volatility (6M) Calculated over the trailing 6-month period	11.41%	10.70%	+0.71%
Volatility (1Y) Calculated over the trailing 1-year period	14.59%	14.32%	+0.27%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.24%	17.11%	+2.13%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.15%	19.43%	-0.28%

Dividends

FMACX vs. BRK-B - Dividend Comparison

FMACX's dividend yield for the trailing twelve months is around 8.16%, while BRK-B has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
BRK-B Berkshire Hathaway Inc.	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
FMACX American Funds AMCAP Fund® Class F-3	8.16%	8.62%	8.39%	3.80%	7.46%	4.50%	4.12%	5.16%	8.13%	5.64%

Frequently Asked Questions

Can I hold both FMACX and BRK-B in my portfolio?

FMACX and BRK-B have a correlation of 0.05, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FMACX or BRK-B?

BRK-B has higher volatility (3.72%) compared to FMACX (3.69%). In terms of maximum drawdown, FMACX dropped -36.00% vs BRK-B's -53.86%.

Which has better risk-adjusted returns?

FMACX currently has the higher Sharpe Ratio (1.46 vs -0.18), 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.