MUB vs. AUSM
MUB (iShares National AMT-Free Muni Bond ETF) and AUSM (Allspring Ultra Short Municipal ETF) are both Municipal Bonds funds. MUB is passively managed, while AUSM is actively managed. At a 0.08 correlation, their price movements are largely independent. MUB charges 0.07%/yr vs 0.18%/yr for AUSM.
Performance
MUB vs. AUSM - Performance Comparison
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Returns By Period
In the year-to-date period, MUB achieves a 1.24% return, which is significantly higher than AUSM's 0.98% return.
MUB
- 1D
- -0.08%
- 1M
- 0.56%
- YTD
- 1.24%
- 6M
- 1.74%
- 1Y
- 6.95%
- 3Y*
- 3.43%
- 5Y*
- 0.86%
- 10Y*
- 2.00%
AUSM
- 1D
- -0.02%
- 1M
- 0.21%
- YTD
- 0.98%
- 6M
- 1.34%
- 1Y
- —
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
MUB vs. AUSM - Yearly Performance Comparison
| 2026 (YTD) | 2025 | |
|---|---|---|
MUB iShares National AMT-Free Muni Bond ETF | 1.24% | 4.52% |
AUSM Allspring Ultra Short Municipal ETF | 0.98% | 1.63% |
Correlation
The correlation between MUB and AUSM is 0.08, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.
| Correlation | |
|---|---|
Correlation (All Time) Calculated using the full available price history since Jul 9, 2025 | 0.08 |
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Return for Risk
MUB vs. AUSM — Risk / Return Rank
MUB
AUSM
MUB vs. AUSM - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares National AMT-Free Muni Bond ETF (MUB) and Allspring Ultra Short Municipal ETF (AUSM). 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.
| MUB | AUSM | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | — | — | |
| Sortino ratioReturn per unit of downside risk | — | — | |
| Omega ratioGain probability vs. loss probability | 1.50 | — | — |
| Calmar ratioReturn relative to maximum drawdown | 2.50 | — | — |
| Martin ratioReturn relative to average drawdown | 8.85 | — | — |
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
| MUB | AUSM | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 2.39 | — | — |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.21 | — | — |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.41 | — | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.58 | 3.98 | -3.39 |
Drawdowns
MUB vs. AUSM - Drawdown Comparison
The maximum MUB drawdown since its inception was -13.68%, which is greater than AUSM's maximum drawdown of -0.42%. Use the drawdown chart below to compare losses from any high point for MUB and AUSM.
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Drawdown Indicators
| MUB | AUSM | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -13.68% | -0.42% | -13.26% |
Max Drawdown (1Y)Largest decline over 1 year | -2.79% | — | — |
Max Drawdown (3Y)Largest decline over 3 years | -5.34% | — | — |
Max Drawdown (5Y)Largest decline over 5 years | -11.88% | — | — |
Max Drawdown (10Y)Largest decline over 10 years | -13.68% | — | — |
Current DrawdownCurrent decline from peak | -0.70% | -0.02% | -0.68% |
Average DrawdownAverage peak-to-trough decline | -2.23% | -0.09% | -2.14% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.79% | — | — |
Volatility
MUB vs. AUSM - Volatility Comparison
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Volatility by Period
| MUB | AUSM | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.97% | — | — |
Volatility (6M)Calculated over the trailing 6-month period | 2.22% | — | — |
Volatility (1Y)Calculated over the trailing 1-year period | 2.92% | 0.73% | +2.19% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 4.06% | 0.73% | +3.33% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 4.92% | 0.73% | +4.19% |
MUB vs. AUSM - Expense Ratio Comparison
MUB has a 0.07% expense ratio, which is lower than AUSM's 0.18% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
MUB vs. AUSM - Dividend Comparison
MUB's dividend yield for the trailing twelve months is around 3.17%, more than AUSM's 2.39% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
AUSM Allspring Ultra Short Municipal ETF | 2.39% | 1.26% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
MUB iShares National AMT-Free Muni Bond ETF | 3.17% | 3.14% | 3.01% | 2.65% | 2.11% | 1.81% | 2.11% | 2.42% | 2.46% | 2.26% | 2.21% | 2.51% |
Frequently Asked Questions
MUB and AUSM have a correlation of 0.08, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
On fees, MUB is cheaper at 0.07% per year. The better choice depends on whether you care most about return, fees, risk, or income.
MUB is cheaper with a 0.07% expense ratio, compared with 0.18% for AUSM.
MUB has the higher dividend yield at 3.17%, compared with 2.39% for AUSM.
They also come from different issuers: iShares and Allspring. Their fees differ too: 0.07% for MUB and 0.18% for AUSM.
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