BUFBX vs. BIGRX

Last updated Jun 5, 2026

BUFBX (Buffalo Flexible Income Fund) and BIGRX (American Century Disciplined Core Value Fund) are both Large Cap Value Equities funds. Over the past 10 years, BUFBX returned 9.95%/yr vs 11.28%/yr for BIGRX. Their correlation of 0.85 suggests significant overlap in exposure. BUFBX charges 1.01%/yr vs 0.65%/yr for BIGRX.

Performance

BUFBX vs. BIGRX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Buffalo Flexible Income Fund (BUFBX) and American Century Disciplined Core Value Fund (BIGRX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BUFBX achieves a 12.34% return, which is significantly higher than BIGRX's 11.65% return. Over the past 10 years, BUFBX has underperformed BIGRX with an annualized return of 9.95%, while BIGRX has yielded a comparatively higher 11.28% annualized return.

BUFBX

• 1D: -0.44%
• 1M: 2.54%
• YTD: 12.34%
• 6M: 12.43%
• 1Y: 20.10%
• 3Y*: 13.75%
• 5Y*: 10.99%
• 10Y*: 9.95%

BIGRX

• 1D: -0.21%
• 1M: 3.15%
• YTD: 11.65%
• 6M: 12.39%
• 1Y: 28.50%
• 3Y*: 17.32%
• 5Y*: 7.38%
• 10Y*: 11.28%

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

BUFBX vs. BIGRX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BUFBX Buffalo Flexible Income Fund	12.34%	10.37%	10.26%	7.42%	3.97%	29.97%	-2.27%	18.76%	-7.01%	13.20%
BIGRX American Century Disciplined Core Value Fund	11.65%	14.85%	13.26%	8.44%	-12.59%	24.22%	11.86%	24.00%	-6.37%	20.63%

Correlation

The correlation between BUFBX and BIGRX is 0.56, 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	0.56
Correlation (3Y) Calculated over the trailing 3-year period	0.74
Correlation (5Y) Calculated over the trailing 5-year period	0.83
Correlation (10Y) Calculated over the trailing 10-year period	0.85
Correlation (All Time) Calculated using the full available price history since Aug 15, 1994	0.85

Over the past year, the correlation between BUFBX and BIGRX has dropped to 0.56 - well below their long-term average of 0.85, suggesting their price drivers have been diverging.

Return for Risk

BUFBX vs. BIGRX — Risk / Return Rank

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

BUFBX

BUFBX Risk / Return Rank: 68
BUFBX Sharpe Ratio Rank: 54
BUFBX Sortino Ratio Rank: 55
BUFBX Omega Ratio Rank: 48
BUFBX Calmar Ratio Rank: 97
BUFBX Martin Ratio Rank: 88

BIGRX

BIGRX Risk / Return Rank: 75
BIGRX Sharpe Ratio Rank: 74
BIGRX Sortino Ratio Rank: 74
BIGRX Omega Ratio Rank: 66
BIGRX Calmar Ratio Rank: 79
BIGRX Martin Ratio Rank: 81

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.

BUFBX vs. BIGRX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Buffalo Flexible Income Fund (BUFBX) and American Century Disciplined Core Value Fund (BIGRX). 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.

	BUFBX	BIGRX	Difference
Sharpe ratio: Return per unit of total volatility	2.18	2.51	-0.33
Sortino ratio: Return per unit of downside risk	3.11	3.60	-0.50
Omega ratio: Gain probability vs. loss probability	1.38	1.45	-0.07
Calmar ratio: Return relative to maximum drawdown	6.87	3.55	+3.32
Martin ratio: Return relative to average drawdown	16.80	14.96	+1.84
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BUFBX vs. BIGRX - Sharpe Ratio Comparison

The current BUFBX Sharpe Ratio is 2.18, which is comparable to the BIGRX Sharpe Ratio of 2.51. The chart below compares the historical Sharpe Ratios of BUFBX and BIGRX, 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

	BUFBX	BIGRX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.18	2.51	-0.33
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.82	0.50	+0.33
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.64	0.67	-0.03
Sharpe Ratio (All Time) Calculated using the full available price history	0.59	0.58	+0.01

Drawdowns

BUFBX vs. BIGRX - Drawdown Comparison

The maximum BUFBX drawdown since its inception was -39.78%, smaller than the maximum BIGRX drawdown of -58.04%. Use the drawdown chart below to compare losses from any high point for BUFBX and BIGRX.

Drawdown Indicators

	BUFBX	BIGRX	Difference
Max Drawdown Largest peak-to-trough decline	-39.78%	-58.04%	+18.26%
Max Drawdown (1Y) Largest decline over 1 year	-2.83%	-7.95%	+5.12%
Max Drawdown (3Y) Largest decline over 3 years	-12.85%	-18.24%	+5.39%
Max Drawdown (5Y) Largest decline over 5 years	-14.67%	-22.19%	+7.52%
Max Drawdown (10Y) Largest decline over 10 years	-35.51%	-32.62%	-2.89%
Current Drawdown Current decline from peak	-0.65%	-0.21%	-0.44%
Average Drawdown Average peak-to-trough decline	-4.72%	-9.00%	+4.28%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.16%	1.88%	-0.72%

Volatility

BUFBX vs. BIGRX - Volatility Comparison

Buffalo Flexible Income Fund (BUFBX) has a higher volatility of 3.10% compared to American Century Disciplined Core Value Fund (BIGRX) at 2.78%. This indicates that BUFBX's price experiences larger fluctuations and is considered to be riskier than BIGRX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BUFBX	BIGRX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.10%	2.78%	+0.32%
Volatility (6M) Calculated over the trailing 6-month period	6.61%	8.33%	-1.72%
Volatility (1Y) Calculated over the trailing 1-year period	8.93%	11.25%	-2.32%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	13.40%	14.94%	-1.54%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	15.60%	16.82%	-1.22%

BUFBX vs. BIGRX - Expense Ratio Comparison

BUFBX has a 1.01% expense ratio, which is higher than BIGRX's 0.65% expense ratio.

Dividends

BUFBX vs. BIGRX - Dividend Comparison

BUFBX's dividend yield for the trailing twelve months is around 8.02%, less than BIGRX's 8.11% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BIGRX American Century Disciplined Core Value Fund	8.11%	9.05%	1.32%	1.55%	1.88%	28.04%	16.19%	3.90%	13.40%	9.32%	3.91%	9.22%
BUFBX Buffalo Flexible Income Fund	8.02%	9.10%	3.77%	3.48%	4.16%	5.57%	3.33%	2.73%	6.01%	5.49%	2.39%	3.67%

Frequently Asked Questions

Can I hold both BUFBX and BIGRX in my portfolio?

BUFBX and BIGRX have a correlation of 0.56, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BUFBX or BIGRX?

BUFBX has higher volatility (3.10%) compared to BIGRX (2.78%). In terms of maximum drawdown, BUFBX dropped -39.78% vs BIGRX's -58.04%.

Which has better risk-adjusted returns?

BIGRX currently has the higher Sharpe Ratio (2.51 vs 2.18), 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.