MUBFX vs. BUFBX

Last updated Jun 23, 2026

MUBFX (MainStay WMC Value Fund) and BUFBX (Buffalo Flexible Income Fund) are both Large Cap Value Equities funds. Over the past 10 years, MUBFX returned 13.06%/yr vs 9.49%/yr for BUFBX. Their correlation of 0.84 suggests significant overlap in exposure. MUBFX charges 0.70%/yr vs 1.01%/yr for BUFBX.

Performance

MUBFX vs. BUFBX - Performance Comparison

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

Returns By Period

In the year-to-date period, MUBFX achieves a 7.39% return, which is significantly lower than BUFBX's 8.04% return. Over the past 10 years, MUBFX has outperformed BUFBX with an annualized return of 13.06%, while BUFBX has yielded a comparatively lower 9.49% annualized return.

MUBFX

• 1D: -0.41%
• 1M: -0.33%
• YTD: 7.39%
• 6M: 6.73%
• 1Y: 19.72%
• 3Y*: 13.78%
• 5Y*: 10.06%
• 10Y*: 13.06%

BUFBX

• 1D: -0.69%
• 1M: -4.45%
• YTD: 8.04%
• 6M: 8.15%
• 1Y: 14.29%
• 3Y*: 11.59%
• 5Y*: 10.73%
• 10Y*: 9.49%

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

MUBFX vs. BUFBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MUBFX MainStay WMC Value Fund	7.39%	14.74%	10.72%	9.62%	-4.54%	28.60%	13.62%	31.67%	-6.89%	22.71%
BUFBX Buffalo Flexible Income Fund	8.04%	10.37%	10.26%	7.42%	3.97%	29.97%	-2.27%	18.76%	-7.01%	13.20%

Correlation

The correlation between MUBFX and BUFBX is 0.65, 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	0.65
Correlation (3Y) Calculated over the trailing 3-year period	0.77
Correlation (5Y) Calculated over the trailing 5-year period	0.84
Correlation (10Y) Calculated over the trailing 10-year period	0.84
Correlation (All Time) Calculated using the full available price history since Aug 12, 1994	0.84

The correlation between MUBFX and BUFBX shifts across timeframes, from 0.65 (1 year) to 0.84 (10 years), reflecting how their relationship changes across market environments.

Return for Risk

MUBFX vs. BUFBX — Risk / Return Rank

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

MUBFX

MUBFX Risk / Return Rank: 53
MUBFX Sharpe Ratio Rank: 47
MUBFX Sortino Ratio Rank: 47
MUBFX Omega Ratio Rank: 44
MUBFX Calmar Ratio Rank: 67
MUBFX Martin Ratio Rank: 61

BUFBX

BUFBX Risk / Return Rank: 47
BUFBX Sharpe Ratio Rank: 34
BUFBX Sortino Ratio Rank: 32
BUFBX Omega Ratio Rank: 30
BUFBX Calmar Ratio Rank: 75
BUFBX Martin Ratio Rank: 63

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.

MUBFX vs. BUFBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MainStay WMC Value Fund (MUBFX) and Buffalo Flexible Income Fund (BUFBX). 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.

	MUBFX	BUFBX	Difference
Sharpe ratio: Return per unit of total volatility	1.86	1.56	+0.30
Sortino ratio: Return per unit of downside risk	2.65	2.19	+0.46
Omega ratio: Gain probability vs. loss probability	1.33	1.27	+0.06
Calmar ratio: Return relative to maximum drawdown	3.00	3.21	-0.21
Martin ratio: Return relative to average drawdown	11.42	11.59	-0.17

MUBFX vs. BUFBX - Sharpe Ratio Comparison

The current MUBFX Sharpe Ratio is 1.86, which is comparable to the BUFBX Sharpe Ratio of 1.56. The chart below compares the historical Sharpe Ratios of MUBFX and BUFBX, 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

MUBFX vs. BUFBX - Drawdown Comparison

The maximum MUBFX drawdown since its inception was -53.31%, which is greater than BUFBX's maximum drawdown of -39.78%. Use the drawdown chart below to compare losses from any high point for MUBFX and BUFBX.

Drawdown Indicators

	MUBFX	BUFBX	Difference
Max Drawdown Largest peak-to-trough decline	-53.31%	-39.78%	-13.53%
Max Drawdown (1Y) Largest decline over 1 year	-6.67%	-4.45%	-2.22%
Max Drawdown (3Y) Largest decline over 3 years	-14.19%	-12.85%	-1.34%
Max Drawdown (5Y) Largest decline over 5 years	-15.61%	-14.67%	-0.94%
Max Drawdown (10Y) Largest decline over 10 years	-39.31%	-35.51%	-3.80%
Current Drawdown Current decline from peak	-1.72%	-4.45%	+2.73%
Average Drawdown Average peak-to-trough decline	-6.16%	-4.72%	-1.44%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.75%	1.23%	+0.52%

Volatility

MUBFX vs. BUFBX - Volatility Comparison

The current volatility for MainStay WMC Value Fund (MUBFX) is 2.99%, while Buffalo Flexible Income Fund (BUFBX) has a volatility of 3.42%. This indicates that MUBFX experiences smaller price fluctuations and is considered to be less risky than BUFBX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MUBFX	BUFBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.99%	3.42%	-0.43%
Volatility (6M) Calculated over the trailing 6-month period	7.81%	6.93%	+0.88%
Volatility (1Y) Calculated over the trailing 1-year period	10.76%	9.18%	+1.58%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.81%	13.42%	+1.39%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.91%	15.61%	+2.30%

MUBFX vs. BUFBX - Expense Ratio Comparison

MUBFX has a 0.70% expense ratio, which is lower than BUFBX's 1.01% expense ratio.

Dividends

MUBFX vs. BUFBX - Dividend Comparison

MUBFX's dividend yield for the trailing twelve months is around 6.87%, less than BUFBX's 8.43% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BUFBX Buffalo Flexible Income Fund	8.43%	9.10%	3.77%	3.48%	4.16%	5.57%	3.33%	2.73%	6.01%	5.49%	2.39%	3.67%
MUBFX MainStay WMC Value Fund	6.87%	7.38%	5.24%	4.49%	5.82%	81.14%	3.79%	8.43%	11.90%	11.15%	2.53%	19.99%

Frequently Asked Questions

Can I hold both MUBFX and BUFBX in my portfolio?

MUBFX and BUFBX have a correlation of 0.65, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MUBFX or BUFBX?

BUFBX has higher volatility (3.42%) compared to MUBFX (2.99%). In terms of maximum drawdown, MUBFX dropped -53.31% vs BUFBX's -39.78%.

Which has better risk-adjusted returns?

MUBFX currently has the higher Sharpe Ratio (1.86 vs 1.56), 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.