SBI vs. WFBIX
SBI (Western Asset Intermediate Muni Fund Inc.) and WFBIX (iShares U.S. Aggregate Bond Index Fund) are both Intermediate Core Bond funds. Over the past 10 years, SBI returned 1.30%/yr vs 1.87%/yr for WFBIX. At a 0.16 correlation, their price movements are largely independent.
Performance
SBI vs. WFBIX - Performance Comparison
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Returns By Period
In the year-to-date period, SBI achieves a 5.17% return, which is significantly higher than WFBIX's 0.10% return. Over the past 10 years, SBI has underperformed WFBIX with an annualized return of 1.30%, while WFBIX has yielded a comparatively higher 1.87% annualized return.
SBI
- 1D
- -0.10%
- 1M
- 1.44%
- YTD
- 5.17%
- 6M
- 4.76%
- 1Y
- 11.55%
- 3Y*
- 6.63%
- 5Y*
- 0.47%
- 10Y*
- 1.30%
WFBIX
- 1D
- -0.33%
- 1M
- 0.56%
- YTD
- 0.10%
- 6M
- 0.42%
- 1Y
- 4.19%
- 3Y*
- 5.22%
- 5Y*
- 0.77%
- 10Y*
- 1.87%
SBI vs. WFBIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
SBI Western Asset Intermediate Muni Fund Inc. | 5.17% | 5.95% | 6.83% | 5.37% | -18.45% | 7.91% | 4.62% | 12.78% | -6.59% | 2.42% |
WFBIX iShares U.S. Aggregate Bond Index Fund | 0.10% | 7.16% | 1.43% | 9.65% | -13.03% | -1.79% | 7.40% | 8.72% | -0.08% | 3.39% |
Correlation
The correlation between SBI and WFBIX is 0.29, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.29 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.44 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.39 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.32 |
Correlation (All Time) Calculated using the full available price history since Jul 2, 1993 | 0.16 |
The correlation between SBI and WFBIX shifts across timeframes, from 0.16 (all time) to 0.44 (3 years), reflecting how their relationship changes across market environments.
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Return for Risk
SBI vs. WFBIX — Risk / Return Rank
SBI
WFBIX
SBI vs. WFBIX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Western Asset Intermediate Muni Fund Inc. (SBI) 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.
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.
| SBI | WFBIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.58 | ||
| Sortino ratioReturn per unit of downside risk | +1.05 | ||
| Omega ratioGain probability vs. loss probability | 1.32 | 1.20 | +0.12 |
| Calmar ratioReturn relative to maximum drawdown | 2.43 | 1.47 | +0.96 |
| Martin ratioReturn relative to average drawdown | 8.53 | 4.11 | +4.42 |
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Drawdowns
SBI vs. WFBIX - Drawdown Comparison
The maximum SBI drawdown since its inception was -33.70%, which is greater than WFBIX's maximum drawdown of -18.68%. Use the drawdown chart below to compare losses from any high point for SBI and WFBIX.
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Drawdown Indicators
| SBI | WFBIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -33.70% | -18.68% | -15.02% |
Max Drawdown (1Y)Largest decline over 1 year | -4.77% | -3.02% | -1.75% |
Max Drawdown (3Y)Largest decline over 3 years | -8.90% | -6.09% | -2.81% |
Max Drawdown (5Y)Largest decline over 5 years | -25.21% | -17.84% | -7.37% |
Max Drawdown (10Y)Largest decline over 10 years | -25.21% | -18.68% | -6.53% |
Current DrawdownCurrent decline from peak | -0.10% | -1.82% | +1.72% |
Average DrawdownAverage peak-to-trough decline | -7.68% | -2.26% | -5.42% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.36% | 1.08% | +0.28% |
Volatility
SBI vs. WFBIX - Volatility Comparison
Western Asset Intermediate Muni Fund Inc. (SBI) has a higher volatility of 1.58% compared to iShares U.S. Aggregate Bond Index Fund (WFBIX) at 1.17%. This indicates that SBI'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
| SBI | WFBIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.58% | 1.17% | +0.41% |
Volatility (6M)Calculated over the trailing 6-month period | 5.25% | 2.89% | +2.36% |
Volatility (1Y)Calculated over the trailing 1-year period | 6.81% | 3.93% | +2.88% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 8.91% | 6.41% | +2.50% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 9.74% | 5.18% | +4.56% |
Dividends
SBI vs. WFBIX - Dividend Comparison
SBI's dividend yield for the trailing twelve months is around 6.45%, more than WFBIX's 3.92% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
SBI Western Asset Intermediate Muni Fund Inc. | 6.45% | 6.56% | 6.23% | 3.76% | 3.72% | 2.93% | 3.07% | 3.59% | 4.32% | 4.58% | 5.01% | 4.70% |
WFBIX iShares U.S. Aggregate Bond Index Fund | 3.92% | 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
SBI and WFBIX have a correlation of 0.29, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
SBI has higher volatility (1.58%) compared to WFBIX (1.17%). In terms of maximum drawdown, SBI dropped -33.70% vs WFBIX's -18.68%.
SBI currently has the higher Sharpe Ratio (1.71 vs 1.13), 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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