WFBIX vs. MPBFX
WFBIX (iShares U.S. Aggregate Bond Index Fund) and MPBFX (BNY Mellon Bond Fund) are both Intermediate Core Bond funds. Over the past 10 years, WFBIX returned 1.94%/yr vs 1.54%/yr for MPBFX. Their correlation of 0.93 suggests significant overlap in exposure. WFBIX charges 0.05%/yr vs 0.55%/yr for MPBFX.
Performance
WFBIX vs. MPBFX - Performance Comparison
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Returns By Period
In the year-to-date period, WFBIX achieves a 0.21% return, which is significantly higher than MPBFX's -0.07% return. Over the past 10 years, WFBIX has outperformed MPBFX with an annualized return of 1.94%, while MPBFX has yielded a comparatively lower 1.54% annualized return.
WFBIX
- 1D
- -0.22%
- 1M
- 0.11%
- YTD
- 0.21%
- 6M
- 0.32%
- 1Y
- 4.53%
- 3Y*
- 5.26%
- 5Y*
- 0.87%
- 10Y*
- 1.94%
MPBFX
- 1D
- -0.27%
- 1M
- 0.04%
- YTD
- -0.07%
- 6M
- -0.03%
- 1Y
- 4.24%
- 3Y*
- 3.73%
- 5Y*
- -0.23%
- 10Y*
- 1.54%
WFBIX vs. MPBFX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
WFBIX iShares U.S. Aggregate Bond Index Fund | 0.21% | 7.16% | 1.43% | 9.65% | -13.03% | -1.79% | 7.40% | 8.72% | -0.08% | 3.39% |
MPBFX BNY Mellon Bond Fund | -0.07% | 7.20% | 1.08% | 5.48% | -13.55% | -1.50% | 7.87% | 8.82% | -0.53% | 3.91% |
Correlation
The correlation between WFBIX and MPBFX is 0.93, 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 | 0.93 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.94 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.96 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.93 |
Correlation (All Time) Calculated using the full available price history since Oct 2, 2000 | 0.93 |
The correlation between WFBIX and MPBFX has been stable across timeframes, ranging from 0.93 to 0.96 - a consistent structural relationship.
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Return for Risk
WFBIX vs. MPBFX — Risk / Return Rank
WFBIX
MPBFX
WFBIX vs. MPBFX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares U.S. Aggregate Bond Index Fund (WFBIX) and BNY Mellon Bond Fund (MPBFX). 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.
| WFBIX | MPBFX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.02 | ||
| Sortino ratioReturn per unit of downside risk | +0.04 | ||
| Omega ratioGain probability vs. loss probability | 1.23 | 1.23 | 0.00 |
| Calmar ratioReturn relative to maximum drawdown | 1.70 | 1.68 | +0.02 |
| Martin ratioReturn relative to average drawdown | 5.08 | 5.13 | -0.05 |
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
| WFBIX | MPBFX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.30 | 1.28 | +0.02 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.14 | -0.04 | +0.18 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.38 | 0.32 | +0.06 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.94 | 0.84 | +0.11 |
Drawdowns
WFBIX vs. MPBFX - Drawdown Comparison
The maximum WFBIX drawdown since its inception was -18.68%, roughly equal to the maximum MPBFX drawdown of -18.40%. Use the drawdown chart below to compare losses from any high point for WFBIX and MPBFX.
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Drawdown Indicators
| WFBIX | MPBFX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -18.68% | -18.40% | -0.28% |
Max Drawdown (1Y)Largest decline over 1 year | -3.02% | -2.87% | -0.15% |
Max Drawdown (3Y)Largest decline over 3 years | -6.09% | -6.18% | +0.09% |
Max Drawdown (5Y)Largest decline over 5 years | -17.84% | -18.40% | +0.56% |
Max Drawdown (10Y)Largest decline over 10 years | -18.68% | -18.40% | -0.28% |
Current DrawdownCurrent decline from peak | -1.71% | -2.81% | +1.10% |
Average DrawdownAverage peak-to-trough decline | -2.26% | -2.41% | +0.15% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.01% | 0.94% | +0.07% |
Volatility
WFBIX vs. MPBFX - Volatility Comparison
iShares U.S. Aggregate Bond Index Fund (WFBIX) and BNY Mellon Bond Fund (MPBFX) have volatilities of 1.31% and 1.33%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| WFBIX | MPBFX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.31% | 1.33% | -0.02% |
Volatility (6M)Calculated over the trailing 6-month period | 2.80% | 2.70% | +0.10% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.97% | 3.78% | +0.19% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.40% | 5.85% | +0.55% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.17% | 4.84% | +0.33% |
WFBIX vs. MPBFX - Expense Ratio Comparison
WFBIX has a 0.05% expense ratio, which is lower than MPBFX's 0.55% expense ratio.
Dividends
WFBIX vs. MPBFX - Dividend Comparison
WFBIX's dividend yield for the trailing twelve months is around 3.91%, more than MPBFX's 3.83% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MPBFX BNY Mellon Bond Fund | 3.83% | 3.82% | 3.70% | 3.17% | 2.86% | 2.33% | 4.64% | 2.87% | 3.00% | 2.89% | 3.12% | 2.77% |
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
With a correlation of 0.93, WFBIX and MPBFX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
MPBFX has higher volatility (1.33%) compared to WFBIX (1.31%). In terms of maximum drawdown, WFBIX dropped -18.68% vs MPBFX's -18.40%.
WFBIX currently has the higher Sharpe Ratio (1.30 vs 1.28), 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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