FMACX vs. BRK-B

Last updated Jun 3, 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 10.01%/yr vs 10.20%/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 7.29% return, which is significantly higher than BRK-B's -5.43% return.

FMACX

• 1D: 0.34%
• 1M: 4.40%
• YTD: 7.29%
• 6M: 7.24%
• 1Y: 23.97%
• 3Y*: 20.50%
• 5Y*: 10.01%
• 10Y*: —

BRK-B

• 1D: 0.82%
• 1M: 1.46%
• YTD: -5.43%
• 6M: -5.61%
• 1Y: -4.51%
• 3Y*: 13.00%
• 5Y*: 10.20%
• 10Y*: 12.91%

*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	7.29%	18.07%	21.49%	31.48%	-28.43%	22.33%	21.81%	26.73%	-4.12%	18.35%
BRK-B Berkshire Hathaway Inc.	-5.43%	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: 30
FMACX Sharpe Ratio Rank: 34
FMACX Sortino Ratio Rank: 32
FMACX Omega Ratio Rank: 34
FMACX Calmar Ratio Rank: 21
FMACX Martin Ratio Rank: 30

BRK-B

BRK-B Risk / Return Rank: 23
BRK-B Sharpe Ratio Rank: 27
BRK-B Sortino Ratio Rank: 22
BRK-B Omega Ratio Rank: 23
BRK-B Calmar Ratio Rank: 24
BRK-B Martin Ratio Rank: 20

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	1.70	-0.32	+2.01
Sortino ratio Return per unit of downside risk	2.35	-0.34	+2.69
Omega ratio Gain probability vs. loss probability	1.31	0.96	+0.35
Calmar ratio Return relative to maximum drawdown	1.74	-0.48	+2.22
Martin ratio Return relative to average drawdown	7.10	-1.02	+8.12
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 1.70, which is higher than the BRK-B Sharpe Ratio of -0.32. 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	1.70	-0.32	+2.01
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.52	0.60	-0.08
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.67	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.68	0.48	+0.20

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	0.00%	-11.94%	+11.94%
Average Drawdown Average peak-to-trough decline	-7.35%	-11.07%	+3.72%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.46%	4.57%	-1.11%

Volatility

FMACX vs. BRK-B - Volatility Comparison

The current volatility for American Funds AMCAP Fund® Class F-3 (FMACX) is 3.43%, while Berkshire Hathaway Inc. (BRK-B) has a volatility of 3.75%. This indicates that FMACX experiences smaller price fluctuations and is considered to be less risky than BRK-B based on this measure. 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	3.43%	3.75%	-0.32%
Volatility (6M) Calculated over the trailing 6-month period	11.39%	10.68%	+0.71%
Volatility (1Y) Calculated over the trailing 1-year period	14.57%	14.33%	+0.24%
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 8.03%, 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	8.03%	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 (3.75%) compared to FMACX (3.43%). 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 (1.70 vs -0.32), 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.