IBMT vs. AUSM
IBMT (iShares iBonds Dec 2031 Term Muni Bond ETF) and AUSM (Allspring Ultra Short Municipal ETF) are both Municipal Bonds funds. IBMT is passively managed, while AUSM is actively managed. At a 0.09 correlation, their price movements are largely independent. Both charge a 0.18% expense ratio.
Performance
IBMT vs. AUSM - Performance Comparison
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Returns By Period
In the year-to-date period, IBMT achieves a 0.19% return, which is significantly lower than AUSM's 0.98% return.
IBMT
- 1D
- -0.02%
- 1M
- 0.35%
- YTD
- 0.19%
- 6M
- 0.25%
- 1Y
- 6.34%
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
AUSM
- 1D
- -0.02%
- 1M
- 0.21%
- YTD
- 0.98%
- 6M
- 1.34%
- 1Y
- —
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
IBMT vs. AUSM - Yearly Performance Comparison
| 2026 (YTD) | 2025 | |
|---|---|---|
IBMT iShares iBonds Dec 2031 Term Muni Bond ETF | 0.19% | 3.51% |
AUSM Allspring Ultra Short Municipal ETF | 0.98% | 1.63% |
Correlation
The correlation between IBMT and AUSM is 0.09, 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 | 0.09 |
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Return for Risk
IBMT vs. AUSM — Risk / Return Rank
IBMT
AUSM
IBMT vs. AUSM - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares iBonds Dec 2031 Term Muni Bond ETF (IBMT) 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.
| IBMT | AUSM | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | — | — | |
| Sortino ratioReturn per unit of downside risk | — | — | |
| Omega ratioGain probability vs. loss probability | 1.46 | — | — |
| Calmar ratioReturn relative to maximum drawdown | 2.06 | — | — |
| Martin ratioReturn relative to average drawdown | 6.13 | — | — |
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
| IBMT | AUSM | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 2.05 | — | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 1.63 | 3.98 | -2.35 |
Drawdowns
IBMT vs. AUSM - Drawdown Comparison
The maximum IBMT drawdown since its inception was -3.18%, which is greater than AUSM's maximum drawdown of -0.42%. Use the drawdown chart below to compare losses from any high point for IBMT and AUSM.
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Drawdown Indicators
| IBMT | AUSM | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -3.18% | -0.42% | -2.76% |
Max Drawdown (1Y)Largest decline over 1 year | -3.10% | — | — |
Current DrawdownCurrent decline from peak | -1.65% | -0.02% | -1.63% |
Average DrawdownAverage peak-to-trough decline | -0.74% | -0.09% | -0.65% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.04% | — | — |
Volatility
IBMT vs. AUSM - Volatility Comparison
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Volatility by Period
| IBMT | AUSM | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.78% | — | — |
Volatility (6M)Calculated over the trailing 6-month period | 2.06% | — | — |
Volatility (1Y)Calculated over the trailing 1-year period | 3.11% | 0.73% | +2.38% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 3.86% | 0.73% | +3.13% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 3.86% | 0.73% | +3.13% |
IBMT vs. AUSM - Expense Ratio Comparison
Both IBMT and AUSM have an expense ratio of 0.18%, making them cost-effective options compared to the broader market, where average expense ratios typically range from 0.3% to 0.9%.
Dividends
IBMT vs. AUSM - Dividend Comparison
IBMT's dividend yield for the trailing twelve months is around 3.65%, more than AUSM's 2.39% yield.
| Position | TTM | 2025 |
|---|---|---|
AUSM Allspring Ultra Short Municipal ETF | 2.39% | 1.26% |
IBMT iShares iBonds Dec 2031 Term Muni Bond ETF | 3.65% | 2.98% |
Frequently Asked Questions
IBMT and AUSM have a correlation of 0.09, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
Both ETFs have the same 0.18% expense ratio. The better choice depends on whether you care most about return, fees, risk, or income.
IBMT and AUSM have the same expense ratio: 0.18% per year.
IBMT has the higher dividend yield at 3.65%, compared with 2.39% for AUSM.
They also come from different issuers: iShares and Allspring.
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