IOBZX vs. BUFHX

Last updated Jun 3, 2026

IOBZX (ICON FlexibleBondFund) and BUFHX (Buffalo High Yield Fund) are both mutual funds - IOBZX is a Multisector Bonds fund managed by ICON Funds, while BUFHX is a High Yield Bonds fund managed by Buffalo. Over the past 10 years, IOBZX returned 4.12%/yr vs 5.36%/yr for BUFHX. At a 0.25 correlation, their price movements are largely independent. IOBZX charges 0.76%/yr vs 1.02%/yr for BUFHX.

Performance

IOBZX vs. BUFHX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in ICON FlexibleBondFund (IOBZX) and Buffalo High Yield Fund (BUFHX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, IOBZX achieves a 1.24% return, which is significantly lower than BUFHX's 1.80% return. Over the past 10 years, IOBZX has underperformed BUFHX with an annualized return of 4.12%, while BUFHX has yielded a comparatively higher 5.36% annualized return.

IOBZX

• 1D: 0.00%
• 1M: 0.37%
• YTD: 1.24%
• 6M: 1.67%
• 1Y: 5.50%
• 3Y*: 6.50%
• 5Y*: 3.72%
• 10Y*: 4.12%

BUFHX

• 1D: 0.00%
• 1M: 0.21%
• YTD: 1.80%
• 6M: 2.46%
• 1Y: 5.09%
• 3Y*: 8.42%
• 5Y*: 4.90%
• 10Y*: 5.36%

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

IOBZX vs. BUFHX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IOBZX ICON FlexibleBondFund	1.24%	5.67%	8.33%	8.28%	-5.63%	4.17%	4.61%	8.16%	0.87%	4.25%
BUFHX Buffalo High Yield Fund	1.80%	5.11%	10.35%	11.68%	-5.53%	5.52%	9.26%	12.33%	-2.26%	5.98%

Correlation

The correlation between IOBZX and BUFHX is 0.61, 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	0.61
Correlation (3Y) Calculated over the trailing 3-year period	0.59
Correlation (5Y) Calculated over the trailing 5-year period	0.62
Correlation (10Y) Calculated over the trailing 10-year period	0.50
Correlation (All Time) Calculated using the full available price history since Feb 4, 2004	0.25

Over the past year, IOBZX and BUFHX have become more correlated (0.61) than their long-term average of 0.25, meaning their price movements have been converging.

Return for Risk

IOBZX vs. BUFHX — Risk / Return Rank

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

IOBZX

IOBZX Risk / Return Rank: 74
IOBZX Sharpe Ratio Rank: 86
IOBZX Sortino Ratio Rank: 83
IOBZX Omega Ratio Rank: 92
IOBZX Calmar Ratio Rank: 49
IOBZX Martin Ratio Rank: 61

BUFHX

BUFHX Risk / Return Rank: 52
BUFHX Sharpe Ratio Rank: 50
BUFHX Sortino Ratio Rank: 57
BUFHX Omega Ratio Rank: 66
BUFHX Calmar Ratio Rank: 40
BUFHX Martin Ratio Rank: 49

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.

IOBZX vs. BUFHX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for ICON FlexibleBondFund (IOBZX) and Buffalo High Yield Fund (BUFHX). 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.

	IOBZX	BUFHX	Difference
Sharpe ratio Return per unit of total volatility	2.77	2.10	+0.68
Sortino ratio Return per unit of downside risk	3.93	3.19	+0.74
Omega ratio Gain probability vs. loss probability	1.69	1.45	+0.23
Calmar ratio Return relative to maximum drawdown	2.67	2.44	+0.23
Martin ratio Return relative to average drawdown	12.11	10.33	+1.79
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IOBZX vs. BUFHX - Sharpe Ratio Comparison

The current IOBZX Sharpe Ratio is 2.77, which is higher than the BUFHX Sharpe Ratio of 2.10. The chart below compares the historical Sharpe Ratios of IOBZX and BUFHX, 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

	IOBZX	BUFHX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.77	2.10	+0.68
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	1.33	1.56	-0.24
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	1.12	1.33	-0.21
Sharpe Ratio (All Time) Calculated using the full available price history	1.12	1.52	-0.40

Drawdowns

IOBZX vs. BUFHX - Drawdown Comparison

The maximum IOBZX drawdown since its inception was -15.53%, smaller than the maximum BUFHX drawdown of -26.01%. Use the drawdown chart below to compare losses from any high point for IOBZX and BUFHX.

Drawdown Indicators

	IOBZX	BUFHX	Difference
Max Drawdown Largest peak-to-trough decline	-15.53%	-26.01%	+10.48%
Max Drawdown (1Y) Largest decline over 1 year	-2.08%	-2.13%	+0.05%
Max Drawdown (3Y) Largest decline over 3 years	-2.97%	-3.83%	+0.86%
Max Drawdown (5Y) Largest decline over 5 years	-8.48%	-9.98%	+1.50%
Max Drawdown (10Y) Largest decline over 10 years	-15.53%	-18.74%	+3.21%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-1.28%	-2.03%	+0.75%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.46%	0.50%	-0.04%

Volatility

IOBZX vs. BUFHX - Volatility Comparison

The current volatility for ICON FlexibleBondFund (IOBZX) is 0.65%, while Buffalo High Yield Fund (BUFHX) has a volatility of 0.69%. This indicates that IOBZX experiences smaller price fluctuations and is considered to be less risky than BUFHX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	IOBZX	BUFHX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.65%	0.69%	-0.04%
Volatility (6M) Calculated over the trailing 6-month period	1.62%	1.96%	-0.34%
Volatility (1Y) Calculated over the trailing 1-year period	2.00%	2.49%	-0.49%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.82%	3.14%	-0.32%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.70%	4.04%	-0.34%

IOBZX vs. BUFHX - Expense Ratio Comparison

IOBZX has a 0.76% expense ratio, which is lower than BUFHX's 1.02% expense ratio.

Dividends

IOBZX vs. BUFHX - Dividend Comparison

IOBZX's dividend yield for the trailing twelve months is around 6.12%, less than BUFHX's 6.94% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BUFHX Buffalo High Yield Fund	6.94%	6.84%	8.03%	6.41%	8.05%	7.24%	4.11%	4.21%	5.17%	4.57%	3.85%	5.51%
IOBZX ICON FlexibleBondFund	6.12%	6.74%	6.71%	5.65%	5.22%	4.90%	4.03%	4.67%	4.18%	4.07%	3.58%	4.00%

Frequently Asked Questions

Can I hold both IOBZX and BUFHX in my portfolio?

IOBZX and BUFHX have a correlation of 0.61, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IOBZX or BUFHX?

BUFHX has higher volatility (0.69%) compared to IOBZX (0.65%). In terms of maximum drawdown, IOBZX dropped -15.53% vs BUFHX's -26.01%.

Which has better risk-adjusted returns?

IOBZX currently has the higher Sharpe Ratio (2.77 vs 2.10), 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.