VTSIX vs. BOSOX

Last updated Jun 4, 2026

VTSIX (Vanguard Tax-Managed Small-Cap Fund Institutional Shares) and BOSOX (Boston Trust Small Cap Fund) are both Small Cap Blend Equities funds. Over the past 10 years, VTSIX returned 10.82%/yr vs 10.23%/yr for BOSOX. With a 0.96 correlation, they move nearly in lockstep. VTSIX charges 0.06%/yr vs 1.00%/yr for BOSOX.

Performance

VTSIX vs. BOSOX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Tax-Managed Small-Cap Fund Institutional Shares (VTSIX) 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, VTSIX achieves a 16.66% return, which is significantly higher than BOSOX's 6.63% return. Over the past 10 years, VTSIX has outperformed BOSOX with an annualized return of 10.82%, while BOSOX has yielded a comparatively lower 10.23% annualized return.

VTSIX

• 1D: 0.92%
• 1M: 2.71%
• YTD: 16.66%
• 6M: 15.44%
• 1Y: 32.97%
• 3Y*: 14.85%
• 5Y*: 6.01%
• 10Y*: 10.82%

BOSOX

• 1D: 0.80%
• 1M: 2.85%
• YTD: 6.63%
• 6M: 4.71%
• 1Y: 6.71%
• 3Y*: 7.74%
• 5Y*: 4.92%
• 10Y*: 10.23%

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

VTSIX vs. BOSOX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VTSIX Vanguard Tax-Managed Small-Cap Fund Institutional Shares	16.66%	5.96%	8.64%	15.99%	-16.14%	27.12%	11.09%	23.30%	-8.59%	13.08%
BOSOX Boston Trust Small Cap Fund	6.63%	-4.04%	12.52%	10.09%	-9.05%	28.10%	8.27%	38.35%	-6.01%	12.24%

Correlation

The correlation between VTSIX and BOSOX 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	0.94
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 Dec 20, 2005	0.96

The correlation between VTSIX and BOSOX has been stable across timeframes, ranging from 0.92 to 0.96 - a consistent structural relationship.

Return for Risk

VTSIX vs. BOSOX — Risk / Return Rank

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

VTSIX

VTSIX Risk / Return Rank: 59
VTSIX Sharpe Ratio Rank: 47
VTSIX Sortino Ratio Rank: 47
VTSIX Omega Ratio Rank: 42
VTSIX Calmar Ratio Rank: 86
VTSIX Martin Ratio Rank: 71

BOSOX

BOSOX Risk / Return Rank: 7
BOSOX Sharpe Ratio Rank: 6
BOSOX Sortino Ratio Rank: 7
BOSOX Omega Ratio Rank: 6
BOSOX Calmar Ratio Rank: 7
BOSOX Martin Ratio Rank: 7

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.

VTSIX vs. BOSOX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Tax-Managed Small-Cap Fund Institutional Shares (VTSIX) 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.

	VTSIX	BOSOX	Difference
Sharpe ratio Return per unit of total volatility	2.01	0.53	+1.49
Sortino ratio Return per unit of downside risk	2.90	0.89	+2.00
Omega ratio Gain probability vs. loss probability	1.35	1.10	+0.24
Calmar ratio Return relative to maximum drawdown	4.11	0.74	+3.36
Martin ratio Return relative to average drawdown	13.63	2.22	+11.41
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VTSIX vs. BOSOX - Sharpe Ratio Comparison

The current VTSIX Sharpe Ratio is 2.01, which is higher than the BOSOX Sharpe Ratio of 0.53. The chart below compares the historical Sharpe Ratios of VTSIX 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.

Sharpe Ratios by Period

	VTSIX	BOSOX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.01	0.53	+1.49
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.28	0.28	0.00
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.47	0.53	-0.06
Sharpe Ratio (All Time) Calculated using the full available price history	0.45	0.43	+0.02

Drawdowns

VTSIX vs. BOSOX - Drawdown Comparison

The maximum VTSIX drawdown since its inception was -57.81%, which is greater than BOSOX's maximum drawdown of -51.32%. Use the drawdown chart below to compare losses from any high point for VTSIX and BOSOX.

Drawdown Indicators

	VTSIX	BOSOX	Difference
Max Drawdown Largest peak-to-trough decline	-57.81%	-51.32%	-6.49%
Max Drawdown (1Y) Largest decline over 1 year	-8.59%	-10.69%	+2.10%
Max Drawdown (3Y) Largest decline over 3 years	-27.92%	-22.36%	-5.56%
Max Drawdown (5Y) Largest decline over 5 years	-27.92%	-22.36%	-5.56%
Max Drawdown (10Y) Largest decline over 10 years	-43.86%	-36.79%	-7.07%
Current Drawdown Current decline from peak	-0.00%	-6.67%	+6.67%
Average Drawdown Average peak-to-trough decline	-8.93%	-7.27%	-1.66%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.58%	3.57%	-0.99%

Volatility

VTSIX vs. BOSOX - Volatility Comparison

Vanguard Tax-Managed Small-Cap Fund Institutional Shares (VTSIX) has a higher volatility of 4.51% compared to Boston Trust Small Cap Fund (BOSOX) at 3.90%. This indicates that VTSIX'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

	VTSIX	BOSOX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.51%	3.90%	+0.61%
Volatility (6M) Calculated over the trailing 6-month period	11.69%	10.08%	+1.61%
Volatility (1Y) Calculated over the trailing 1-year period	17.54%	15.10%	+2.44%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.46%	17.82%	+3.64%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.11%	19.56%	+3.55%

VTSIX vs. BOSOX - Expense Ratio Comparison

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

Dividends

VTSIX vs. BOSOX - Dividend Comparison

VTSIX's dividend yield for the trailing twelve months is around 1.17%, less than BOSOX's 4.14% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BOSOX Boston Trust Small Cap Fund	4.14%	4.41%	6.52%	0.78%	5.09%	8.93%	2.56%	12.46%	16.19%	9.13%	3.14%	18.92%
VTSIX Vanguard Tax-Managed Small-Cap Fund Institutional Shares	1.17%	1.31%	1.47%	1.52%	1.54%	1.19%	1.11%	1.17%	1.29%	1.13%	1.03%	1.30%

Frequently Asked Questions

Can I hold both VTSIX and BOSOX in my portfolio?

With a correlation of 0.92, VTSIX and BOSOX 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, VTSIX or BOSOX?

VTSIX has higher volatility (4.51%) compared to BOSOX (3.90%). In terms of maximum drawdown, VTSIX dropped -57.81% vs BOSOX's -51.32%.

Which has better risk-adjusted returns?

VTSIX currently has the higher Sharpe Ratio (2.01 vs 0.53), 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.