TGFRX vs. BUFTX

Last updated Jun 25, 2026

TGFRX (Tanaka Growth Fund) and BUFTX (Buffalo Discovery Fund) are both Mid Cap Growth Equities funds. Over the past 10 years, TGFRX returned 15.93%/yr vs 7.84%/yr for BUFTX. Their correlation of 0.81 suggests significant overlap in exposure. TGFRX charges 2.19%/yr vs 1.00%/yr for BUFTX.

Performance

TGFRX vs. BUFTX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Tanaka Growth Fund (TGFRX) and Buffalo Discovery Fund (BUFTX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, TGFRX achieves a 14.76% return, which is significantly higher than BUFTX's -4.47% return. Over the past 10 years, TGFRX has outperformed BUFTX with an annualized return of 15.93%, while BUFTX has yielded a comparatively lower 7.84% annualized return.

TGFRX

• 1D: -2.53%
• 1M: 1.64%
• YTD: 14.76%
• 6M: 3.64%
• 1Y: 51.65%
• 3Y*: 31.14%
• 5Y*: 14.18%
• 10Y*: 15.93%

BUFTX

• 1D: -1.59%
• 1M: 0.84%
• YTD: -4.47%
• 6M: -5.93%
• 1Y: -8.86%
• 3Y*: 3.21%
• 5Y*: -2.13%
• 10Y*: 7.84%

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

TGFRX vs. BUFTX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TGFRX Tanaka Growth Fund	14.76%	39.56%	17.98%	50.24%	-22.62%	26.54%	50.87%	18.78%	-25.18%	7.28%
BUFTX Buffalo Discovery Fund	-4.47%	-1.83%	5.31%	24.30%	-28.78%	11.55%	33.90%	31.62%	-6.52%	25.43%

Correlation

The correlation between TGFRX and BUFTX is 0.60, 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	0.60
Correlation (3Y) Calculated over the trailing 3-year period	0.69
Correlation (5Y) Calculated over the trailing 5-year period	0.76
Correlation (10Y) Calculated over the trailing 10-year period	0.74
Correlation (All Time) Calculated using the full available price history since Apr 16, 2001	0.81

Over the past year, the correlation between TGFRX and BUFTX has dropped to 0.60 - well below their long-term average of 0.81, suggesting their price drivers have been diverging.

Return for Risk

TGFRX vs. BUFTX — Risk / Return Rank

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

TGFRX

TGFRX Risk / Return Rank: 50
TGFRX Sharpe Ratio Rank: 46
TGFRX Sortino Ratio Rank: 40
TGFRX Omega Ratio Rank: 38
TGFRX Calmar Ratio Rank: 80
TGFRX Martin Ratio Rank: 43

BUFTX

BUFTX Risk / Return Rank: 1
BUFTX Sharpe Ratio Rank: 1
BUFTX Sortino Ratio Rank: 1
BUFTX Omega Ratio Rank: 1
BUFTX Calmar Ratio Rank: 1
BUFTX Martin Ratio Rank: 1

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.

TGFRX vs. BUFTX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Tanaka Growth Fund (TGFRX) and Buffalo Discovery Fund (BUFTX). 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.

	TGFRX	BUFTX	Difference
Sharpe ratio: Return per unit of total volatility	1.77	-0.46	+2.23
Sortino ratio: Return per unit of downside risk	2.35	-0.55	+2.91
Omega ratio: Gain probability vs. loss probability	1.29	0.94	+0.36
Calmar ratio: Return relative to maximum drawdown	3.37	-0.39	+3.77
Martin ratio: Return relative to average drawdown	8.46	-0.88	+9.34

TGFRX vs. BUFTX - Sharpe Ratio Comparison

The current TGFRX Sharpe Ratio is 1.77, which is higher than the BUFTX Sharpe Ratio of -0.46. The chart below compares the historical Sharpe Ratios of TGFRX and BUFTX, 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

TGFRX vs. BUFTX - Drawdown Comparison

The maximum TGFRX drawdown since its inception was -74.43%, which is greater than BUFTX's maximum drawdown of -60.45%. Use the drawdown chart below to compare losses from any high point for TGFRX and BUFTX.

Drawdown Indicators

	TGFRX	BUFTX	Difference
Max Drawdown Largest peak-to-trough decline	-74.43%	-60.45%	-13.98%
Max Drawdown (1Y) Largest decline over 1 year	-16.01%	-19.03%	+3.02%
Max Drawdown (3Y) Largest decline over 3 years	-61.68%	-22.10%	-39.58%
Max Drawdown (5Y) Largest decline over 5 years	-61.68%	-36.36%	-25.32%
Max Drawdown (10Y) Largest decline over 10 years	-61.68%	-36.36%	-25.32%
Current Drawdown Current decline from peak	-29.42%	-15.28%	-14.14%
Average Drawdown Average peak-to-trough decline	-29.60%	-11.32%	-18.28%
Ulcer Index Depth and duration of drawdowns from previous peaks	6.37%	8.46%	-2.09%

Volatility

TGFRX vs. BUFTX - Volatility Comparison

Tanaka Growth Fund (TGFRX) has a higher volatility of 10.36% compared to Buffalo Discovery Fund (BUFTX) at 6.42%. This indicates that TGFRX's price experiences larger fluctuations and is considered to be riskier than BUFTX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TGFRX	BUFTX	Difference
Volatility (1M) Calculated over the trailing 1-month period	10.36%	6.42%	+3.94%
Volatility (6M) Calculated over the trailing 6-month period	23.83%	12.94%	+10.89%
Volatility (1Y) Calculated over the trailing 1-year period	30.58%	16.13%	+14.45%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	62.20%	21.20%	+41.00%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	47.46%	20.42%	+27.04%

TGFRX vs. BUFTX - Expense Ratio Comparison

TGFRX has a 2.19% expense ratio, which is higher than BUFTX's 1.00% expense ratio.

Dividends

TGFRX vs. BUFTX - Dividend Comparison

TGFRX's dividend yield for the trailing twelve months is around 11.35%, less than BUFTX's 22.14% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BUFTX Buffalo Discovery Fund	22.14%	21.15%	10.00%	0.00%	7.08%	15.11%	7.98%	14.81%	7.01%	4.64%	0.00%	7.56%
TGFRX Tanaka Growth Fund	11.35%	13.02%	6.89%	0.00%	0.11%	7.44%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both TGFRX and BUFTX in my portfolio?

TGFRX and BUFTX have a correlation of 0.60, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TGFRX or BUFTX?

TGFRX has higher volatility (10.36%) compared to BUFTX (6.42%). In terms of maximum drawdown, TGFRX dropped -74.43% vs BUFTX's -60.45%.

Which has better risk-adjusted returns?

TGFRX currently has the higher Sharpe Ratio (1.77 vs -0.46), 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.