MBOAX vs. WFBIX
MBOAX (Madison Core Bond Fund) and WFBIX (iShares U.S. Aggregate Bond Index Fund) are both Intermediate Core Bond funds. Over the past 10 years, MBOAX returned 1.61%/yr vs 1.96%/yr for WFBIX. Their correlation of 0.91 suggests significant overlap in exposure. MBOAX charges 0.85%/yr vs 0.05%/yr for WFBIX.
Performance
MBOAX vs. WFBIX - Performance Comparison
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Returns By Period
In the year-to-date period, MBOAX achieves a 0.12% return, which is significantly lower than WFBIX's 0.43% return. Over the past 10 years, MBOAX has underperformed WFBIX with an annualized return of 1.61%, while WFBIX has yielded a comparatively higher 1.96% annualized return.
MBOAX
- 1D
- 0.11%
- 1M
- 0.51%
- YTD
- 0.12%
- 6M
- 0.02%
- 1Y
- 5.02%
- 3Y*
- 3.92%
- 5Y*
- 0.05%
- 10Y*
- 1.61%
WFBIX
- 1D
- 0.00%
- 1M
- 0.45%
- YTD
- 0.43%
- 6M
- 0.32%
- 1Y
- 5.35%
- 3Y*
- 5.33%
- 5Y*
- 0.99%
- 10Y*
- 1.96%
MBOAX vs. WFBIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
MBOAX Madison Core Bond Fund | 0.12% | 6.96% | 1.14% | 5.63% | -12.82% | -1.85% | 9.22% | 8.31% | -0.98% | 3.02% |
WFBIX iShares U.S. Aggregate Bond Index Fund | 0.43% | 7.16% | 1.43% | 9.65% | -13.03% | -1.79% | 7.40% | 8.72% | -0.08% | 3.39% |
Correlation
The correlation between MBOAX and WFBIX is 0.88, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.88 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.92 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.93 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.92 |
Correlation (All Time) Calculated using the full available price history since Dec 30, 1997 | 0.91 |
The correlation between MBOAX and WFBIX has been stable across timeframes, ranging from 0.88 to 0.93 - a consistent structural relationship.
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Return for Risk
MBOAX vs. WFBIX — Risk / Return Rank
MBOAX
WFBIX
MBOAX vs. WFBIX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Madison Core Bond Fund (MBOAX) and iShares U.S. Aggregate Bond Index Fund (WFBIX). 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.
| MBOAX | WFBIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | 0.00 | ||
| Sortino ratioReturn per unit of downside risk | -0.03 | ||
| Omega ratioGain probability vs. loss probability | 1.25 | 1.25 | 0.00 |
| Calmar ratioReturn relative to maximum drawdown | 1.76 | 1.78 | -0.02 |
| Martin ratioReturn relative to average drawdown | 5.40 | 5.34 | +0.07 |
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
| MBOAX | WFBIX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.35 | 1.36 | 0.00 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.01 | 0.16 | -0.15 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.35 | 0.38 | -0.03 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.74 | 0.94 | -0.21 |
Drawdowns
MBOAX vs. WFBIX - Drawdown Comparison
The maximum MBOAX drawdown since its inception was -17.78%, roughly equal to the maximum WFBIX drawdown of -18.68%. Use the drawdown chart below to compare losses from any high point for MBOAX and WFBIX.
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Drawdown Indicators
| MBOAX | WFBIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -17.78% | -18.68% | +0.90% |
Max Drawdown (1Y)Largest decline over 1 year | -2.93% | -3.02% | +0.09% |
Max Drawdown (3Y)Largest decline over 3 years | -6.10% | -6.09% | -0.01% |
Max Drawdown (5Y)Largest decline over 5 years | -17.55% | -17.84% | +0.29% |
Max Drawdown (10Y)Largest decline over 10 years | -17.78% | -18.68% | +0.90% |
Current DrawdownCurrent decline from peak | -2.11% | -1.50% | -0.61% |
Average DrawdownAverage peak-to-trough decline | -2.36% | -2.26% | -0.10% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.95% | 1.00% | -0.05% |
Volatility
MBOAX vs. WFBIX - Volatility Comparison
Madison Core Bond Fund (MBOAX) has a higher volatility of 1.45% compared to iShares U.S. Aggregate Bond Index Fund (WFBIX) at 1.34%. This indicates that MBOAX's price experiences larger fluctuations and is considered to be riskier than WFBIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| MBOAX | WFBIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.45% | 1.34% | +0.11% |
Volatility (6M)Calculated over the trailing 6-month period | 2.78% | 2.83% | -0.05% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.81% | 3.97% | -0.16% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.61% | 6.40% | -0.79% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 4.65% | 5.17% | -0.52% |
MBOAX vs. WFBIX - Expense Ratio Comparison
MBOAX has a 0.85% expense ratio, which is higher than WFBIX's 0.05% expense ratio.
Dividends
MBOAX vs. WFBIX - Dividend Comparison
MBOAX's dividend yield for the trailing twelve months is around 3.49%, less than WFBIX's 3.91% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MBOAX Madison Core Bond Fund | 3.49% | 3.39% | 3.27% | 2.73% | 1.88% | 1.85% | 3.77% | 2.42% | 2.48% | 2.28% | 2.72% | 4.60% |
WFBIX iShares U.S. Aggregate Bond Index Fund | 3.91% | 3.78% | 3.68% | 6.82% | 2.60% | 2.04% | 2.43% | 2.88% | 2.71% | 2.24% | 2.25% | 2.20% |
Frequently Asked Questions
MBOAX and WFBIX have a correlation of 0.88, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
MBOAX has higher volatility (1.45%) compared to WFBIX (1.34%). In terms of maximum drawdown, MBOAX dropped -17.78% vs WFBIX's -18.68%.
WFBIX currently has the higher Sharpe Ratio (1.36 vs 1.35), 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.
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