FXAIX vs. BRK-B

Last updated Jun 9, 2026

FXAIX (Fidelity 500 Index Fund) is S&P 500 fund tracking the S&P 500 Index, while BRK-B (Berkshire Hathaway Inc.) is a stock. Over the past 10 years, FXAIX returned 15.25%/yr vs 13.14%/yr for BRK-B. A 0.68 correlation means they provide meaningful diversification when combined.

Performance

FXAIX vs. BRK-B - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity 500 Index Fund (FXAIX) 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, FXAIX achieves a 8.42% return, which is significantly higher than BRK-B's -3.11% return. Over the past 10 years, FXAIX has outperformed BRK-B with an annualized return of 15.25%, while BRK-B has yielded a comparatively lower 13.14% annualized return.

FXAIX

• 1D: -2.63%
• 1M: -0.08%
• YTD: 8.42%
• 6M: 8.48%
• 1Y: 24.54%
• 3Y*: 21.52%
• 5Y*: 13.40%
• 10Y*: 15.25%

BRK-B

• 1D: -0.23%
• 1M: 2.32%
• YTD: -3.11%
• 6M: -2.06%
• 1Y: -1.32%
• 3Y*: 13.25%
• 5Y*: 11.03%
• 10Y*: 13.14%

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

FXAIX vs. BRK-B - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FXAIX Fidelity 500 Index Fund	8.42%	17.84%	25.01%	26.29%	-18.14%	28.71%	18.42%	31.48%	-4.43%	21.82%
BRK-B Berkshire Hathaway Inc.	-3.11%	10.89%	27.09%	15.46%	3.31%	28.95%	2.37%	10.93%	3.01%	21.62%

Correlation

The correlation between FXAIX and BRK-B is 0.11, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.11
Correlation (3Y) Calculated over the trailing 3-year period	0.33
Correlation (5Y) Calculated over the trailing 5-year period	0.52
Correlation (10Y) Calculated over the trailing 10-year period	0.61
Correlation (All Time) Calculated using the full available price history since May 4, 2011	0.68

Over the past year, the correlation between FXAIX and BRK-B has dropped to 0.11 - well below their long-term average of 0.68, suggesting their price drivers have been diverging.

Return for Risk

FXAIX vs. BRK-B — Risk / Return Rank

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

FXAIX

FXAIX Risk / Return Rank: 59
FXAIX Sharpe Ratio Rank: 56
FXAIX Sortino Ratio Rank: 49
FXAIX Omega Ratio Rank: 53
FXAIX Calmar Ratio Rank: 62
FXAIX Martin Ratio Rank: 75

BRK-B

BRK-B Risk / Return Rank: 35
BRK-B Sharpe Ratio Rank: 38
BRK-B Sortino Ratio Rank: 30
BRK-B Omega Ratio Rank: 30
BRK-B Calmar Ratio Rank: 38
BRK-B Martin Ratio Rank: 37

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.

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

This table presents a comparison of risk-adjusted performance metrics for Fidelity 500 Index Fund (FXAIX) 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.

	FXAIX	BRK-B	Difference
Sharpe ratio: Return per unit of total volatility	2.13	-0.09	+2.22
Sortino ratio: Return per unit of downside risk	2.87	-0.03	+2.90
Omega ratio: Gain probability vs. loss probability	1.39	1.00	+0.39
Calmar ratio: Return relative to maximum drawdown	2.92	-0.14	+3.06
Martin ratio: Return relative to average drawdown	13.57	-0.30	+13.86
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FXAIX vs. BRK-B - Sharpe Ratio Comparison

The current FXAIX Sharpe Ratio is 2.13, which is higher than the BRK-B Sharpe Ratio of -0.09. The chart below compares the historical Sharpe Ratios of FXAIX 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

	FXAIX	BRK-B	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.13	-0.09	+2.22
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.79	0.65	+0.15
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.85	0.68	+0.17
Sharpe Ratio (All Time) Calculated using the full available price history	0.81	0.48	+0.33

Drawdowns

FXAIX vs. BRK-B - Drawdown Comparison

The maximum FXAIX drawdown since its inception was -33.79%, smaller than the maximum BRK-B drawdown of -53.86%. Use the drawdown chart below to compare losses from any high point for FXAIX and BRK-B.

Drawdown Indicators

	FXAIX	BRK-B	Difference
Max Drawdown Largest peak-to-trough decline	-33.79%	-53.86%	+20.07%
Max Drawdown (1Y) Largest decline over 1 year	-8.89%	-9.42%	+0.53%
Max Drawdown (3Y) Largest decline over 3 years	-18.76%	-14.95%	-3.81%
Max Drawdown (5Y) Largest decline over 5 years	-24.50%	-26.58%	+2.08%
Max Drawdown (10Y) Largest decline over 10 years	-33.79%	-29.57%	-4.22%
Current Drawdown Current decline from peak	-2.94%	-9.78%	+6.84%
Average Drawdown Average peak-to-trough decline	-3.79%	-11.07%	+7.28%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.91%	4.49%	-2.58%

Volatility

FXAIX vs. BRK-B - Volatility Comparison

Fidelity 500 Index Fund (FXAIX) and Berkshire Hathaway Inc. (BRK-B) have volatilities of 3.81% and 3.98%, 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

	FXAIX	BRK-B	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.81%	3.98%	-0.17%
Volatility (6M) Calculated over the trailing 6-month period	9.41%	10.87%	-1.46%
Volatility (1Y) Calculated over the trailing 1-year period	12.19%	14.38%	-2.19%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.95%	17.13%	-0.18%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.08%	19.44%	-1.36%

Dividends

FXAIX vs. BRK-B - Dividend Comparison

FXAIX's dividend yield for the trailing twelve months is around 1.06%, while BRK-B has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%	0.00%	0.00%
FXAIX Fidelity 500 Index Fund	1.06%	1.11%	1.25%	1.45%	1.69%	1.22%	1.60%	2.06%	2.72%	1.97%	2.52%	2.83%

Frequently Asked Questions

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

FXAIX and BRK-B have a correlation of 0.11, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FXAIX or BRK-B?

BRK-B has higher volatility (3.98%) compared to FXAIX (3.81%). In terms of maximum drawdown, FXAIX dropped -33.79% vs BRK-B's -53.86%.

Which has better risk-adjusted returns?

FXAIX currently has the higher Sharpe Ratio (2.13 vs -0.09), 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.