BUFSX vs. VISGX

Last updated Aug 1, 2026

BUFSX (Buffalo Small Cap Fund) and VISGX (Vanguard Small Cap Growth Index Fund) are both Small Cap Growth Equities funds. Over the past 10 years, BUFSX returned 10.02%/yr vs 10.62%/yr for VISGX. Their correlation of 0.93 means they have usually moved in the same direction. BUFSX charges 1.01%/yr vs 0.19%/yr for VISGX.

Performance

BUFSX vs. VISGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Buffalo Small Cap Fund (BUFSX) and Vanguard Small Cap Growth Index Fund (VISGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BUFSX achieves a 10.90% return, which is significantly lower than VISGX's 13.27% return. Over the past 10 years, BUFSX has underperformed VISGX with an annualized return of 10.02%, while VISGX has yielded a comparatively higher 10.62% annualized return.

BUFSX

• 1D: 2.74%
• 1M: -5.34%
• 6M: 6.60%
• YTD: 10.90%
• 1Y: 15.81%
• 3Y*: 3.53%
• 5Y*: -4.20%
• 10Y*: 10.02%
• ALL TIME*: 10.56%

VISGX

• 1D: 2.23%
• 1M: -4.70%
• 6M: 9.29%
• YTD: 13.27%
• 1Y: 23.41%
• 3Y*: 13.02%
• 5Y*: 4.02%
• 10Y*: 10.62%
• ALL TIME*: 9.03%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
BUFSX Buffalo Small Cap Fund	$0.00	$0.00	$0.00
VISGX Vanguard Small Cap Growth Index Fund	$0.00	$0.00	$0.00

BUFSX vs. VISGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BUFSX Buffalo Small Cap Fund	10.90%	-0.13%	5.38%	5.45%	-30.01%	4.44%	66.49%	40.97%	-5.73%	26.96%
VISGX Vanguard Small Cap Growth Index Fund	13.27%	8.18%	14.80%	22.91%	-28.50%	5.58%	35.11%	32.60%	-5.81%	21.78%

Correlation

The correlation between BUFSX and VISGX is 0.94, meaning they have usually moved in the same direction, including during past declines.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.94
Correlation (3Y) Balances recent behavior with more history.	0.94
Correlation (5Y) Shows whether the relationship held over a longer period.	0.96
Correlation (10Y) Provides a long-term view across more market conditions.	0.95
Correlation (All Time) Calculated using the full available price history since May 21, 1998	0.93

The correlation between BUFSX and VISGX has been stable across timeframes, ranging from 0.93 to 0.96 - a consistent structural relationship.

Return for Risk

BUFSX vs. VISGX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

BUFSX

BUFSX Risk / Return Rank: 17
BUFSX Sharpe Ratio Rank: 16
BUFSX Sortino Ratio Rank: 18
BUFSX Omega Ratio Rank: 16
BUFSX Calmar Ratio Rank: 17
BUFSX Martin Ratio Rank: 20

VISGX

VISGX Risk / Return Rank: 36
VISGX Sharpe Ratio Rank: 30
VISGX Sortino Ratio Rank: 31
VISGX Omega Ratio Rank: 28
VISGX Calmar Ratio Rank: 47
VISGX Martin Ratio Rank: 42

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

BUFSX vs. VISGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Buffalo Small Cap Fund (BUFSX) and Vanguard Small Cap Growth Index Fund (VISGX). 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.

	BUFSX	VISGX	Difference
Sharpe ratio: Return per unit of total volatility	0.60	0.97	-0.37
Sortino ratio: Return per unit of downside risk	1.01	1.46	-0.45
Omega ratio: Gain probability vs. loss probability	1.11	1.17	-0.06
Calmar ratio: Return relative to maximum drawdown	0.81	1.76	-0.94
Martin ratio: Return relative to average drawdown	2.78	5.98	-3.20

BUFSX vs. VISGX - Sharpe Ratio Comparison

The current BUFSX Sharpe Ratio is 0.60, which is lower than the VISGX Sharpe Ratio of 0.97. The chart below compares the historical Sharpe Ratios of BUFSX and VISGX, 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

BUFSX vs. VISGX - Drawdown Comparison

The maximum BUFSX drawdown since its inception was -53.24%, smaller than the maximum VISGX drawdown of -58.74%. Use the drawdown chart below to compare losses from any high point for BUFSX and VISGX.

Drawdown Indicators

	BUFSX	VISGX	Difference
Max Drawdown Largest peak-to-trough decline	-53.24%	-58.74%	+5.50%
Max Drawdown (1Y) Largest decline over 1 year	-14.92%	-11.39%	-3.53%
Max Drawdown (3Y) Largest decline over 3 years	-26.39%	-27.58%	+1.19%
Max Drawdown (5Y) Largest decline over 5 years	-46.57%	-38.41%	-8.16%
Max Drawdown (10Y) Largest decline over 10 years	-46.74%	-38.70%	-8.04%
Current Drawdown Current decline from peak	-24.46%	-6.66%	-17.80%
Average Drawdown Average peak-to-trough decline	-12.96%	-11.56%	-1.40%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.38%	3.36%	+1.02%

Volatility

BUFSX vs. VISGX - Volatility Comparison

Buffalo Small Cap Fund (BUFSX) has a higher volatility of 6.01% compared to Vanguard Small Cap Growth Index Fund (VISGX) at 5.23%. This indicates that BUFSX's price experiences larger fluctuations and is considered to be riskier than VISGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BUFSX	VISGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.01%	5.23%	+0.78%
Volatility (6M) Calculated over the trailing 6-month period	15.33%	16.14%	-0.81%
Volatility (1Y) Calculated over the trailing 1-year period	20.27%	20.70%	-0.43%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	24.61%	23.74%	+0.87%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	24.59%	23.03%	+1.56%

BUFSX vs. VISGX - Expense Ratio Comparison

BUFSX has a 1.01% expense ratio, which is higher than VISGX's 0.19% expense ratio.

Dividends

BUFSX vs. VISGX - Dividend Comparison

BUFSX has not paid dividends to shareholders, while VISGX's dividend yield for the trailing twelve months is around 0.33%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BUFSX Buffalo Small Cap Fund	0.00%	0.00%	0.00%	0.00%	0.00%	13.53%	9.01%	9.14%	31.02%	30.30%	25.19%	70.18%
VISGX Vanguard Small Cap Growth Index Fund	0.33%	0.33%	0.42%	0.56%	0.46%	0.23%	0.35%	0.47%	0.65%	0.71%	0.97%	0.84%

Frequently Asked Questions

Can I hold both BUFSX and VISGX in my portfolio?

With a correlation of 0.94, BUFSX and VISGX 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, BUFSX or VISGX?

BUFSX has higher volatility (6.01%) compared to VISGX (5.23%). In terms of maximum drawdown, BUFSX dropped -53.24% vs VISGX's -58.74%.

Which has better risk-adjusted returns?

VISGX currently has the higher Sharpe Ratio (0.97 vs 0.60), 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.