BGFIX vs. VIGIX

Last updated Jun 4, 2026

BGFIX (William Blair Growth Fund) and VIGIX (Vanguard Growth Index Fund Institutional Shares) are both Large Cap Growth Equities funds. Over the past 10 years, BGFIX returned 15.45%/yr vs 18.40%/yr for VIGIX. Their correlation of 0.95 suggests significant overlap in exposure. BGFIX charges 0.89%/yr vs 0.04%/yr for VIGIX.

Performance

BGFIX vs. VIGIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in William Blair Growth Fund (BGFIX) and Vanguard Growth Index Fund Institutional Shares (VIGIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with BGFIX having a 10.53% return and VIGIX slightly higher at 10.83%. Over the past 10 years, BGFIX has underperformed VIGIX with an annualized return of 15.45%, while VIGIX has yielded a comparatively higher 18.40% annualized return.

BGFIX

• 1D: -0.25%
• 1M: 9.33%
• YTD: 10.53%
• 6M: 9.06%
• 1Y: 25.69%
• 3Y*: 19.13%
• 5Y*: 10.61%
• 10Y*: 15.45%

VIGIX

• 1D: -0.28%
• 1M: 7.55%
• YTD: 10.83%
• 6M: 10.12%
• 1Y: 29.46%
• 3Y*: 26.47%
• 5Y*: 15.72%
• 10Y*: 18.40%

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

BGFIX vs. VIGIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BGFIX William Blair Growth Fund	10.53%	10.83%	22.26%	38.13%	-29.60%	22.24%	36.48%	32.43%	5.25%	24.53%
VIGIX Vanguard Growth Index Fund Institutional Shares	10.83%	19.44%	32.68%	46.77%	-33.13%	27.27%	40.19%	37.26%	-3.34%	27.81%

Correlation

The correlation between BGFIX and VIGIX is 0.92, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.92
Correlation (3Y) Calculated over the trailing 3-year period	0.92
Correlation (5Y) Calculated over the trailing 5-year period	0.95
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since Oct 1, 1999	0.95

The correlation between BGFIX and VIGIX has been stable across timeframes, ranging from 0.92 to 0.95 - a consistent structural relationship.

Return for Risk

BGFIX vs. VIGIX — Risk / Return Rank

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

BGFIX

BGFIX Risk / Return Rank: 24
BGFIX Sharpe Ratio Rank: 32
BGFIX Sortino Ratio Rank: 28
BGFIX Omega Ratio Rank: 30
BGFIX Calmar Ratio Rank: 15
BGFIX Martin Ratio Rank: 14

VIGIX

VIGIX Risk / Return Rank: 34
VIGIX Sharpe Ratio Rank: 43
VIGIX Sortino Ratio Rank: 38
VIGIX Omega Ratio Rank: 39
VIGIX Calmar Ratio Rank: 25
VIGIX Martin Ratio Rank: 27

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.

BGFIX vs. VIGIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for William Blair Growth Fund (BGFIX) and Vanguard Growth Index Fund Institutional Shares (VIGIX). 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.

	BGFIX	VIGIX	Difference
Sharpe ratio Return per unit of total volatility	1.62	1.92	-0.30
Sortino ratio Return per unit of downside risk	2.22	2.59	-0.38
Omega ratio Gain probability vs. loss probability	1.29	1.33	-0.05
Calmar ratio Return relative to maximum drawdown	1.37	1.85	-0.48
Martin ratio Return relative to average drawdown	3.90	6.49	-2.60
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BGFIX vs. VIGIX - Sharpe Ratio Comparison

The current BGFIX Sharpe Ratio is 1.62, which is comparable to the VIGIX Sharpe Ratio of 1.92. The chart below compares the historical Sharpe Ratios of BGFIX and VIGIX, 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

	BGFIX	VIGIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.62	1.92	-0.30
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.50	0.71	-0.21
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.75	0.86	-0.10
Sharpe Ratio (All Time) Calculated using the full available price history	0.43	0.47	-0.05

Drawdowns

BGFIX vs. VIGIX - Drawdown Comparison

The maximum BGFIX drawdown since its inception was -53.45%, smaller than the maximum VIGIX drawdown of -56.95%. Use the drawdown chart below to compare losses from any high point for BGFIX and VIGIX.

Drawdown Indicators

	BGFIX	VIGIX	Difference
Max Drawdown Largest peak-to-trough decline	-53.45%	-56.95%	+3.50%
Max Drawdown (1Y) Largest decline over 1 year	-19.83%	-16.51%	-3.32%
Max Drawdown (3Y) Largest decline over 3 years	-25.34%	-23.03%	-2.31%
Max Drawdown (5Y) Largest decline over 5 years	-36.70%	-35.62%	-1.08%
Max Drawdown (10Y) Largest decline over 10 years	-36.70%	-35.62%	-1.08%
Current Drawdown Current decline from peak	-0.25%	-0.28%	+0.03%
Average Drawdown Average peak-to-trough decline	-13.41%	-16.28%	+2.87%
Ulcer Index Depth and duration of drawdowns from previous peaks	6.92%	4.68%	+2.24%

Volatility

BGFIX vs. VIGIX - Volatility Comparison

William Blair Growth Fund (BGFIX) has a higher volatility of 4.55% compared to Vanguard Growth Index Fund Institutional Shares (VIGIX) at 3.62%. This indicates that BGFIX's price experiences larger fluctuations and is considered to be riskier than VIGIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BGFIX	VIGIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.55%	3.62%	+0.93%
Volatility (6M) Calculated over the trailing 6-month period	12.65%	12.10%	+0.55%
Volatility (1Y) Calculated over the trailing 1-year period	16.75%	15.87%	+0.88%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.52%	22.35%	-0.83%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.57%	21.59%	-1.02%

BGFIX vs. VIGIX - Expense Ratio Comparison

BGFIX has a 0.89% expense ratio, which is higher than VIGIX's 0.04% expense ratio.

Dividends

BGFIX vs. VIGIX - Dividend Comparison

BGFIX's dividend yield for the trailing twelve months is around 24.40%, more than VIGIX's 0.37% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BGFIX William Blair Growth Fund	24.40%	26.97%	24.13%	9.67%	3.60%	11.74%	12.31%	8.62%	33.23%	34.05%	8.35%	12.91%
VIGIX Vanguard Growth Index Fund Institutional Shares	0.37%	0.41%	0.47%	0.58%	0.70%	0.48%	0.66%	0.95%	1.32%	1.15%	1.40%	1.31%

Frequently Asked Questions

Can I hold both BGFIX and VIGIX in my portfolio?

With a correlation of 0.92, BGFIX and VIGIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, BGFIX or VIGIX?

BGFIX has higher volatility (4.55%) compared to VIGIX (3.62%). In terms of maximum drawdown, BGFIX dropped -53.45% vs VIGIX's -56.95%.

Which has better risk-adjusted returns?

VIGIX currently has the higher Sharpe Ratio (1.92 vs 1.62), 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.