BWBIX vs. FDFIX

Last updated Apr 1, 2026

Compare and contrast key facts about Baron WealthBuilder Fund (BWBIX) and Fidelity Flex 500 Index Fund (FDFIX).

BWBIX is managed by Baron Capital Group, Inc.. It was launched on Dec 28, 2017. FDFIX is managed by Fidelity. It was launched on Mar 9, 2017.

Performance

BWBIX vs. FDFIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Baron WealthBuilder Fund (BWBIX) and Fidelity Flex 500 Index Fund (FDFIX). The values are adjusted to include any dividend payments, if applicable.

BWBIX vs. FDFIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
BWBIX Baron WealthBuilder Fund	-9.86%	10.23%	19.62%	25.77%	-32.58%	14.76%	62.85%	36.41%	-12.02%
FDFIX Fidelity Flex 500 Index Fund	-7.27%	17.59%	25.06%	26.27%	-18.10%	28.69%	18.46%	31.47%	-7.16%

Returns By Period

In the year-to-date period, BWBIX achieves a -9.86% return, which is significantly lower than FDFIX's -7.27% return.

BWBIX

• 1D: -0.10%
• 1M: -8.51%
• YTD: -9.86%
• 6M: -5.37%
• 1Y: 7.86%
• 3Y*: 10.63%
• 5Y*: 2.69%
• 10Y*: —

FDFIX

• 1D: -0.33%
• 1M: -7.59%
• YTD: -7.27%
• 6M: -4.96%
• 1Y: 13.90%
• 3Y*: 17.02%
• 5Y*: 11.31%
• 10Y*: —

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

BWBIX vs. FDFIX - Expense Ratio Comparison

BWBIX has a 0.05% expense ratio, which is higher than FDFIX's 0.00% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

BWBIX

Baron WealthBuilder Fund

FDFIX

Fidelity Flex 500 Index Fund

Return for Risk

BWBIX vs. FDFIX — Risk / Return Rank

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

BWBIX

BWBIX Risk / Return Rank: 16
BWBIX Sharpe Ratio Rank: 15
BWBIX Sortino Ratio Rank: 17
BWBIX Omega Ratio Rank: 16
BWBIX Calmar Ratio Rank: 16
BWBIX Martin Ratio Rank: 17

FDFIX

FDFIX Risk / Return Rank: 42
FDFIX Sharpe Ratio Rank: 39
FDFIX Sortino Ratio Rank: 43
FDFIX Omega Ratio Rank: 47
FDFIX Calmar Ratio Rank: 36
FDFIX Martin Ratio Rank: 46

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.

BWBIX vs. FDFIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Baron WealthBuilder Fund (BWBIX) and Fidelity Flex 500 Index Fund (FDFIX). 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.

	BWBIX	FDFIX	Difference
Sharpe ratio Return per unit of total volatility	0.41	0.81	-0.40
Sortino ratio Return per unit of downside risk	0.75	1.26	-0.51
Omega ratio Gain probability vs. loss probability	1.10	1.19	-0.09
Calmar ratio Return relative to maximum drawdown	0.46	0.96	-0.50
Martin ratio Return relative to average drawdown	1.76	4.59	-2.83
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BWBIX vs. FDFIX - Sharpe Ratio Comparison

The current BWBIX Sharpe Ratio is 0.41, which is lower than the FDFIX Sharpe Ratio of 0.81. The chart below compares the historical Sharpe Ratios of BWBIX and FDFIX, 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

	BWBIX	FDFIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.41	0.81	-0.40
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.13	0.67	-0.55
Sharpe Ratio (All Time) Calculated using the full available price history	0.47	0.71	-0.24

Correlation

The correlation between BWBIX and FDFIX is 0.88, 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

BWBIX vs. FDFIX - Dividend Comparison

BWBIX's dividend yield for the trailing twelve months is around 8.44%, more than FDFIX's 1.20% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
BWBIX Baron WealthBuilder Fund	8.44%	7.61%	0.77%	0.06%	3.21%	3.75%	1.24%	3.51%	0.14%	0.00%
FDFIX Fidelity Flex 500 Index Fund	1.20%	1.11%	1.26%	1.48%	1.70%	1.27%	1.52%	1.78%	2.16%	0.50%

Drawdowns

BWBIX vs. FDFIX - Drawdown Comparison

The maximum BWBIX drawdown since its inception was -39.14%, which is greater than FDFIX's maximum drawdown of -33.77%. Use the drawdown chart below to compare losses from any high point for BWBIX and FDFIX.

Drawdown Indicators

	BWBIX	FDFIX	Difference
Max Drawdown Largest peak-to-trough decline	-39.14%	-33.77%	-5.37%
Max Drawdown (1Y) Largest decline over 1 year	-12.76%	-12.13%	-0.63%
Max Drawdown (5Y) Largest decline over 5 years	-39.14%	-24.51%	-14.63%
Current Drawdown Current decline from peak	-11.65%	-8.99%	-2.66%
Average Drawdown Average peak-to-trough decline	-11.88%	-4.64%	-7.24%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.35%	2.60%	+0.75%

Volatility

BWBIX vs. FDFIX - Volatility Comparison

Baron WealthBuilder Fund (BWBIX) has a higher volatility of 4.45% compared to Fidelity Flex 500 Index Fund (FDFIX) at 4.22%. This indicates that BWBIX's price experiences larger fluctuations and is considered to be riskier than FDFIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BWBIX	FDFIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.45%	4.22%	+0.23%
Volatility (6M) Calculated over the trailing 6-month period	11.07%	9.16%	+1.91%
Volatility (1Y) Calculated over the trailing 1-year period	19.80%	18.20%	+1.60%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.17%	16.91%	+4.26%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.30%	18.68%	+4.62%