BAB vs. ZMUN
BAB (Invesco Taxable Municipal Bond ETF) and ZMUN (F/m Ultrashort Tax-Free Municipal ETF) are both Municipal Bonds funds - BAB tracks the BofA Merrill Lynch Build America Bond Index while ZMUN tracks the Bloomberg Municipal Bond Currently Callable Index. Both are passively managed. At a 0.10 correlation, their price movements are largely independent. BAB charges 0.28%/yr vs 0.30%/yr for ZMUN.
Performance
BAB vs. ZMUN - Performance Comparison
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Returns By Period
In the year-to-date period, BAB achieves a 0.12% return, which is significantly lower than ZMUN's 1.57% return.
BAB
- 1D
- 0.00%
- 1M
- 0.33%
- YTD
- 0.12%
- 6M
- -0.01%
- 1Y
- 7.16%
- 3Y*
- 4.42%
- 5Y*
- -0.38%
- 10Y*
- 2.24%
ZMUN
- 1D
- -0.02%
- 1M
- 0.21%
- YTD
- 1.57%
- 6M
- 1.86%
- 1Y
- —
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
BAB vs. ZMUN - Yearly Performance Comparison
| 2026 (YTD) | 2025 | |
|---|---|---|
BAB Invesco Taxable Municipal Bond ETF | 0.12% | 0.66% |
ZMUN F/m Ultrashort Tax-Free Municipal ETF | 1.57% | 0.73% |
Correlation
The correlation between BAB and ZMUN is 0.10, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (All Time) Calculated using the full available price history since Oct 1, 2025 | 0.10 |
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Return for Risk
BAB vs. ZMUN — Risk / Return Rank
BAB
ZMUN
BAB vs. ZMUN - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Invesco Taxable Municipal Bond ETF (BAB) and F/m Ultrashort Tax-Free Municipal ETF (ZMUN). 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.
| BAB | ZMUN | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | — | — | |
| Sortino ratioReturn per unit of downside risk | — | — | |
| Omega ratioGain probability vs. loss probability | 1.22 | — | — |
| Calmar ratioReturn relative to maximum drawdown | 1.73 | — | — |
| Martin ratioReturn relative to average drawdown | 4.93 | — | — |
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
| BAB | ZMUN | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.24 | — | — |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | -0.05 | — | — |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.23 | — | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.52 | 6.46 | -5.94 |
Drawdowns
BAB vs. ZMUN - Drawdown Comparison
The maximum BAB drawdown since its inception was -27.80%, which is greater than ZMUN's maximum drawdown of -0.09%. Use the drawdown chart below to compare losses from any high point for BAB and ZMUN.
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Drawdown Indicators
| BAB | ZMUN | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -27.80% | -0.09% | -27.71% |
Max Drawdown (1Y)Largest decline over 1 year | -4.15% | — | — |
Max Drawdown (3Y)Largest decline over 3 years | -7.57% | — | — |
Max Drawdown (5Y)Largest decline over 5 years | -24.95% | — | — |
Max Drawdown (10Y)Largest decline over 10 years | -27.80% | — | — |
Current DrawdownCurrent decline from peak | -5.64% | -0.02% | -5.62% |
Average DrawdownAverage peak-to-trough decline | -5.31% | -0.01% | -5.30% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.46% | — | — |
Volatility
BAB vs. ZMUN - Volatility Comparison
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Volatility by Period
| BAB | ZMUN | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.72% | — | — |
Volatility (6M)Calculated over the trailing 6-month period | 3.78% | — | — |
Volatility (1Y)Calculated over the trailing 1-year period | 5.80% | 0.54% | +5.26% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 8.33% | 0.54% | +7.79% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 9.69% | 0.54% | +9.15% |
BAB vs. ZMUN - Expense Ratio Comparison
BAB has a 0.28% expense ratio, which is lower than ZMUN's 0.30% expense ratio.
Dividends
BAB vs. ZMUN - Dividend Comparison
BAB's dividend yield for the trailing twelve months is around 4.10%, more than ZMUN's 2.28% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
BAB Invesco Taxable Municipal Bond ETF | 4.10% | 3.96% | 3.97% | 3.65% | 3.40% | 2.63% | 2.96% | 3.77% | 4.20% | 3.96% | 4.26% | 4.71% |
ZMUN F/m Ultrashort Tax-Free Municipal ETF | 2.28% | 0.70% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
Frequently Asked Questions
BAB and ZMUN have a correlation of 0.10, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
On fees, BAB is cheaper at 0.28% per year. The better choice depends on whether you care most about return, fees, risk, or income.
BAB is cheaper with a 0.28% expense ratio, compared with 0.30% for ZMUN.
BAB has the higher dividend yield at 4.10%, compared with 2.28% for ZMUN.
BAB tracks BofA Merrill Lynch Build America Bond Index, while ZMUN tracks Bloomberg Municipal Bond Currently Callable Index. They also come from different issuers: Invesco and F/m Investments. Their fees differ too: 0.28% for BAB and 0.30% for ZMUN.
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