WFBIX vs. MNTRX
WFBIX (iShares U.S. Aggregate Bond Index Fund) and MNTRX (Allspring Core Bond Fund) are both Intermediate Core Bond funds. Over the past 10 years, WFBIX returned 1.91%/yr vs 1.40%/yr for MNTRX. Their correlation of 0.92 suggests significant overlap in exposure. WFBIX charges 0.05%/yr vs 0.70%/yr for MNTRX.
Performance
WFBIX vs. MNTRX - Performance Comparison
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Returns By Period
In the year-to-date period, WFBIX achieves a 0.43% return, which is significantly higher than MNTRX's 0.29% return. Over the past 10 years, WFBIX has outperformed MNTRX with an annualized return of 1.91%, while MNTRX has yielded a comparatively lower 1.40% annualized return.
WFBIX
- 1D
- 0.55%
- 1M
- 0.56%
- YTD
- 0.43%
- 6M
- 0.98%
- 1Y
- 4.88%
- 3Y*
- 5.33%
- 5Y*
- 0.82%
- 10Y*
- 1.91%
MNTRX
- 1D
- 0.55%
- 1M
- 0.52%
- YTD
- 0.29%
- 6M
- 0.90%
- 1Y
- 4.87%
- 3Y*
- 3.88%
- 5Y*
- -0.24%
- 10Y*
- 1.40%
WFBIX vs. MNTRX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
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% |
MNTRX Allspring Core Bond Fund | 0.29% | 7.16% | 1.38% | 5.37% | -13.82% | -2.10% | 8.51% | 8.18% | -0.57% | 3.28% |
Correlation
The correlation between WFBIX and MNTRX 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 | 0.96 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.97 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.93 |
Correlation (All Time) Calculated using the full available price history since Jun 30, 1997 | 0.92 |
The correlation between WFBIX and MNTRX has been stable across timeframes, ranging from 0.92 to 0.97 - a consistent structural relationship.
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Return for Risk
WFBIX vs. MNTRX — Risk / Return Rank
WFBIX
MNTRX
WFBIX vs. MNTRX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares U.S. Aggregate Bond Index Fund (WFBIX) and Allspring Core Bond Fund (MNTRX). 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.
| WFBIX | MNTRX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.03 | ||
| Sortino ratioReturn per unit of downside risk | +0.06 | ||
| Omega ratioGain probability vs. loss probability | 1.22 | 1.22 | +0.01 |
| Calmar ratioReturn relative to maximum drawdown | 1.62 | 1.56 | +0.06 |
| Martin ratioReturn relative to average drawdown | 4.66 | 4.59 | +0.07 |
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Drawdowns
WFBIX vs. MNTRX - Drawdown Comparison
The maximum WFBIX drawdown since its inception was -18.68%, roughly equal to the maximum MNTRX drawdown of -19.36%. Use the drawdown chart below to compare losses from any high point for WFBIX and MNTRX.
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Drawdown Indicators
| WFBIX | MNTRX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -18.68% | -19.36% | +0.68% |
Max Drawdown (1Y)Largest decline over 1 year | -3.02% | -3.06% | +0.04% |
Max Drawdown (3Y)Largest decline over 3 years | -6.09% | -6.27% | +0.18% |
Max Drawdown (5Y)Largest decline over 5 years | -17.84% | -18.91% | +1.07% |
Max Drawdown (10Y)Largest decline over 10 years | -18.68% | -19.36% | +0.68% |
Current DrawdownCurrent decline from peak | -1.50% | -3.14% | +1.64% |
Average DrawdownAverage peak-to-trough decline | -2.26% | -2.46% | +0.20% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.05% | 1.04% | +0.01% |
Volatility
WFBIX vs. MNTRX - Volatility Comparison
iShares U.S. Aggregate Bond Index Fund (WFBIX) and Allspring Core Bond Fund (MNTRX) have volatilities of 1.36% and 1.35%, 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 | MNTRX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.36% | 1.35% | +0.01% |
Volatility (6M)Calculated over the trailing 6-month period | 2.88% | 2.93% | -0.05% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.95% | 3.95% | 0.00% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.41% | 6.04% | +0.37% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.17% | 4.96% | +0.21% |
WFBIX vs. MNTRX - Expense Ratio Comparison
WFBIX has a 0.05% expense ratio, which is lower than MNTRX's 0.70% expense ratio.
Dividends
WFBIX vs. MNTRX - Dividend Comparison
WFBIX's dividend yield for the trailing twelve months is around 3.91%, less than MNTRX's 4.06% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MNTRX Allspring Core Bond Fund | 4.06% | 4.07% | 4.13% | 3.19% | 1.85% | 1.75% | 6.35% | 2.46% | 2.33% | 1.74% | 1.97% | 1.45% |
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 MNTRX 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.
WFBIX has higher volatility (1.36%) compared to MNTRX (1.35%). In terms of maximum drawdown, WFBIX dropped -18.68% vs MNTRX's -19.36%.
WFBIX currently has the higher Sharpe Ratio (1.25 vs 1.22), 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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