VSGIX vs. BOSOX

Last updated Jun 23, 2026

VSGIX (Vanguard Small-Cap Growth Index Fund Institutional Shares) and BOSOX (Boston Trust Small Cap Fund) are both mutual funds - VSGIX is a Small Cap Growth Equities fund managed by Vanguard, while BOSOX is a Small Cap Blend Equities fund managed by Boston Trust Walden. Over the past 10 years, VSGIX returned 11.90%/yr vs 10.61%/yr for BOSOX. Their correlation of 0.90 suggests significant overlap in exposure. VSGIX charges 0.06%/yr vs 1.00%/yr for BOSOX.

Performance

VSGIX vs. BOSOX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX) and Boston Trust Small Cap Fund (BOSOX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VSGIX achieves a 18.39% return, which is significantly higher than BOSOX's 10.25% return. Over the past 10 years, VSGIX has outperformed BOSOX with an annualized return of 11.90%, while BOSOX has yielded a comparatively lower 10.61% annualized return.

VSGIX

• 1D: 2.00%
• 1M: 2.79%
• YTD: 18.39%
• 6M: 14.68%
• 1Y: 32.93%
• 3Y*: 16.99%
• 5Y*: 5.59%
• 10Y*: 11.90%

BOSOX

• 1D: 1.22%
• 1M: 3.92%
• YTD: 10.25%
• 6M: 7.09%
• 1Y: 12.15%
• 3Y*: 8.22%
• 5Y*: 6.17%
• 10Y*: 10.61%

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

VSGIX vs. BOSOX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VSGIX Vanguard Small-Cap Growth Index Fund Institutional Shares	18.39%	8.44%	14.95%	23.07%	-28.39%	5.70%	35.29%	32.77%	-5.70%	21.94%
BOSOX Boston Trust Small Cap Fund	10.25%	-4.04%	12.52%	10.09%	-9.05%	28.10%	8.27%	38.35%	-6.01%	12.24%

Correlation

The correlation between VSGIX and BOSOX is 0.70, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.70
Correlation (3Y) Calculated over the trailing 3-year period	0.81
Correlation (5Y) Calculated over the trailing 5-year period	0.84
Correlation (10Y) Calculated over the trailing 10-year period	0.84
Correlation (All Time) Calculated using the full available price history since Dec 19, 2005	0.90

The correlation between VSGIX and BOSOX shifts across timeframes, from 0.70 (1 year) to 0.90 (all time), reflecting how their relationship changes across market environments.

Return for Risk

VSGIX vs. BOSOX — Risk / Return Rank

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

VSGIX

VSGIX Risk / Return Rank: 45
VSGIX Sharpe Ratio Rank: 37
VSGIX Sortino Ratio Rank: 34
VSGIX Omega Ratio Rank: 32
VSGIX Calmar Ratio Rank: 62
VSGIX Martin Ratio Rank: 58

BOSOX

BOSOX Risk / Return Rank: 11
BOSOX Sharpe Ratio Rank: 10
BOSOX Sortino Ratio Rank: 11
BOSOX Omega Ratio Rank: 10
BOSOX Calmar Ratio Rank: 12
BOSOX Martin Ratio Rank: 12

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.

VSGIX vs. BOSOX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX) and Boston Trust Small Cap Fund (BOSOX). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	VSGIX	BOSOX	Difference
Sharpe ratio: Return per unit of total volatility	1.63	0.78	+0.85
Sortino ratio: Return per unit of downside risk	2.26	1.27	+0.99
Omega ratio: Gain probability vs. loss probability	1.28	1.14	+0.13
Calmar ratio: Return relative to maximum drawdown	2.90	1.11	+1.79
Martin ratio: Return relative to average drawdown	10.84	3.34	+7.50

VSGIX vs. BOSOX - Sharpe Ratio Comparison

The current VSGIX Sharpe Ratio is 1.63, which is higher than the BOSOX Sharpe Ratio of 0.78. The chart below compares the historical Sharpe Ratios of VSGIX and BOSOX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

VSGIX vs. BOSOX - Drawdown Comparison

The maximum VSGIX drawdown since its inception was -58.66%, which is greater than BOSOX's maximum drawdown of -51.32%. Use the drawdown chart below to compare losses from any high point for VSGIX and BOSOX.

Drawdown Indicators

	VSGIX	BOSOX	Difference
Max Drawdown Largest peak-to-trough decline	-58.66%	-51.32%	-7.34%
Max Drawdown (1Y) Largest decline over 1 year	-11.38%	-10.69%	-0.69%
Max Drawdown (3Y) Largest decline over 3 years	-27.47%	-22.36%	-5.11%
Max Drawdown (5Y) Largest decline over 5 years	-38.36%	-22.36%	-16.00%
Max Drawdown (10Y) Largest decline over 10 years	-38.70%	-36.79%	-1.91%
Current Drawdown Current decline from peak	-0.30%	-3.50%	+3.20%
Average Drawdown Average peak-to-trough decline	-11.32%	-7.27%	-4.05%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.04%	3.54%	-0.50%

Volatility

VSGIX vs. BOSOX - Volatility Comparison

Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX) has a higher volatility of 7.29% compared to Boston Trust Small Cap Fund (BOSOX) at 4.20%. This indicates that VSGIX's price experiences larger fluctuations and is considered to be riskier than BOSOX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VSGIX	BOSOX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.29%	4.20%	+3.09%
Volatility (6M) Calculated over the trailing 6-month period	15.86%	10.25%	+5.61%
Volatility (1Y) Calculated over the trailing 1-year period	20.29%	15.20%	+5.09%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.70%	17.84%	+5.86%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.05%	19.57%	+3.48%

VSGIX vs. BOSOX - Expense Ratio Comparison

VSGIX has a 0.06% expense ratio, which is lower than BOSOX's 1.00% expense ratio.

Dividends

VSGIX vs. BOSOX - Dividend Comparison

VSGIX's dividend yield for the trailing twelve months is around 0.45%, less than BOSOX's 4.00% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BOSOX Boston Trust Small Cap Fund	4.00%	4.41%	6.52%	0.78%	5.09%	8.93%	2.56%	12.46%	16.19%	9.13%	3.14%	18.92%
VSGIX Vanguard Small-Cap Growth Index Fund Institutional Shares	0.45%	0.55%	0.55%	0.68%	0.56%	0.37%	0.45%	0.58%	0.80%	0.82%	1.09%	0.98%

Frequently Asked Questions

Can I hold both VSGIX and BOSOX in my portfolio?

VSGIX and BOSOX have a correlation of 0.70, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VSGIX or BOSOX?

VSGIX has higher volatility (7.29%) compared to BOSOX (4.20%). In terms of maximum drawdown, VSGIX dropped -58.66% vs BOSOX's -51.32%.

Which has better risk-adjusted returns?

VSGIX currently has the higher Sharpe Ratio (1.63 vs 0.78), 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.