BUFMX vs. VOO
Compare and contrast key facts about Buffalo Mid Cap Fund (BUFMX) and Vanguard S&P 500 ETF (VOO).
BUFMX is managed by Buffalo. It was launched on Dec 17, 2001. VOO is a passively managed fund by Vanguard that tracks the performance of the S&P 500 Index. It was launched on Sep 7, 2010.
Performance
BUFMX vs. VOO - Performance Comparison
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BUFMX vs. VOO - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
BUFMX Buffalo Mid Cap Fund | -9.21% | -1.68% | 6.73% | 26.92% | -27.89% | 14.39% | 34.24% | 37.96% | -7.29% | 13.59% |
VOO Vanguard S&P 500 ETF | -3.66% | 17.82% | 24.98% | 26.32% | -18.17% | 28.79% | 18.32% | 31.37% | -4.50% | 21.77% |
Returns By Period
In the year-to-date period, BUFMX achieves a -9.21% return, which is significantly lower than VOO's -3.66% return. Over the past 10 years, BUFMX has underperformed VOO with an annualized return of 7.63%, while VOO has yielded a comparatively higher 14.14% annualized return.
BUFMX
- 1D
- 2.56%
- 1M
- -6.91%
- YTD
- -9.21%
- 6M
- -13.70%
- 1Y
- -6.91%
- 3Y*
- 3.58%
- 5Y*
- -1.32%
- 10Y*
- 7.63%
VOO
- 1D
- 0.79%
- 1M
- -4.29%
- YTD
- -3.66%
- 6M
- -1.41%
- 1Y
- 18.17%
- 3Y*
- 18.58%
- 5Y*
- 11.93%
- 10Y*
- 14.14%
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BUFMX vs. VOO - Expense Ratio Comparison
BUFMX has a 1.02% expense ratio, which is higher than VOO's 0.03% expense ratio.
Return for Risk
BUFMX vs. VOO — Risk / Return Rank
BUFMX
VOO
BUFMX vs. VOO - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Buffalo Mid Cap Fund (BUFMX) and Vanguard S&P 500 ETF (VOO). 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.
| BUFMX | VOO | Difference | |
|---|---|---|---|
Sharpe ratioReturn per unit of total volatility | -0.34 | 1.01 | -1.35 |
Sortino ratioReturn per unit of downside risk | -0.36 | 1.53 | -1.89 |
Omega ratioGain probability vs. loss probability | 0.95 | 1.23 | -0.28 |
Calmar ratioReturn relative to maximum drawdown | -0.35 | 1.55 | -1.90 |
Martin ratioReturn relative to average drawdown | -0.94 | 7.31 | -8.25 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| BUFMX | VOO | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | -0.34 | 1.01 | -1.35 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | -0.07 | 0.71 | -0.78 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.39 | 0.79 | -0.40 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.36 | 0.83 | -0.47 |
Correlation
The correlation between BUFMX and VOO 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
BUFMX vs. VOO - Dividend Comparison
BUFMX's dividend yield for the trailing twelve months is around 11.35%, more than VOO's 1.18% yield.
| TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
BUFMX Buffalo Mid Cap Fund | 11.35% | 10.31% | 6.93% | 5.21% | 5.46% | 11.45% | 6.91% | 8.20% | 4.47% | 25.22% | 8.49% | 13.06% |
VOO Vanguard S&P 500 ETF | 1.18% | 1.13% | 1.24% | 1.46% | 1.69% | 1.25% | 1.54% | 1.88% | 2.06% | 1.78% | 2.02% | 2.10% |
Drawdowns
BUFMX vs. VOO - Drawdown Comparison
The maximum BUFMX drawdown since its inception was -58.44%, which is greater than VOO's maximum drawdown of -33.99%. Use the drawdown chart below to compare losses from any high point for BUFMX and VOO.
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Drawdown Indicators
| BUFMX | VOO | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -58.44% | -33.99% | -24.45% |
Max Drawdown (1Y)Largest decline over 1 year | -18.37% | -11.98% | -6.39% |
Max Drawdown (5Y)Largest decline over 5 years | -35.58% | -24.52% | -11.06% |
Max Drawdown (10Y)Largest decline over 10 years | -35.58% | -33.99% | -1.59% |
Current DrawdownCurrent decline from peak | -16.76% | -5.55% | -11.21% |
Average DrawdownAverage peak-to-trough decline | -9.38% | -3.72% | -5.66% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 6.76% | 2.55% | +4.21% |
Volatility
BUFMX vs. VOO - Volatility Comparison
Buffalo Mid Cap Fund (BUFMX) has a higher volatility of 5.70% compared to Vanguard S&P 500 ETF (VOO) at 5.34%. This indicates that BUFMX's price experiences larger fluctuations and is considered to be riskier than VOO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| BUFMX | VOO | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 5.70% | 5.34% | +0.36% |
Volatility (6M)Calculated over the trailing 6-month period | 11.68% | 9.47% | +2.21% |
Volatility (1Y)Calculated over the trailing 1-year period | 19.42% | 18.11% | +1.31% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 20.11% | 16.82% | +3.29% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 19.70% | 17.99% | +1.71% |