FSMB vs. AMUN
FSMB (First Trust Short Duration Managed Municipal ETF) and AMUN (abrdn Ultra Short Municipal Income Active ETF) are both Municipal Bonds funds. Both are actively managed. At a 0.25 correlation, their price movements are largely independent. FSMB charges 0.45%/yr vs 0.25%/yr for AMUN.
Performance
FSMB vs. AMUN - Performance Comparison
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Returns By Period
The year-to-date returns for both investments are quite close, with FSMB having a 1.32% return and AMUN slightly higher at 1.38%.
FSMB
- 1D
- -0.05%
- 1M
- 0.14%
- 6M
- 1.14%
- YTD
- 1.32%
- 1Y
- 3.48%
- 3Y*
- 3.37%
- 5Y*
- 1.47%
- 10Y*
- —
AMUN
- 1D
- -0.02%
- 1M
- 0.21%
- 6M
- 1.29%
- YTD
- 1.38%
- 1Y
- —
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
FSMB vs. AMUN - Yearly Performance Comparison
| 2026 (YTD) | 2025 | |
|---|---|---|
FSMB First Trust Short Duration Managed Municipal ETF | 1.32% | 0.41% |
AMUN abrdn Ultra Short Municipal Income Active ETF | 1.38% | 0.14% |
Correlation
The correlation between FSMB and AMUN is 0.25, 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 20, 2025 | 0.25 |
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Return for Risk
FSMB vs. AMUN — Risk / Return Rank
FSMB
AMUN
Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.
FSMB vs. AMUN - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for First Trust Short Duration Managed Municipal ETF (FSMB) and abrdn Ultra Short Municipal Income Active ETF (AMUN). 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.
| FSMB | AMUN | 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 | 2.72 | — | — |
| Martin ratioReturn relative to average drawdown | 9.21 | — | — |
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Drawdowns
FSMB vs. AMUN - Drawdown Comparison
The maximum FSMB drawdown since its inception was -6.32%, which is greater than AMUN's maximum drawdown of -0.61%. Use the drawdown chart below to compare losses from any high point for FSMB and AMUN.
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Drawdown Indicators
| FSMB | AMUN | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -6.32% | -0.61% | -5.71% |
Max Drawdown (1Y)Largest decline over 1 year | -1.29% | — | — |
Max Drawdown (3Y)Largest decline over 3 years | -1.76% | — | — |
Max Drawdown (5Y)Largest decline over 5 years | -5.97% | — | — |
Current DrawdownCurrent decline from peak | -0.15% | -0.02% | -0.13% |
Average DrawdownAverage peak-to-trough decline | -1.14% | -0.08% | -1.06% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.38% | — | — |
Volatility
FSMB vs. AMUN - Volatility Comparison
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Volatility by Period
| FSMB | AMUN | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.36% | — | — |
Volatility (6M)Calculated over the trailing 6-month period | 1.04% | — | — |
Volatility (1Y)Calculated over the trailing 1-year period | 1.42% | 0.95% | +0.47% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 1.96% | 0.95% | +1.01% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 2.90% | 0.95% | +1.95% |
FSMB vs. AMUN - Expense Ratio Comparison
FSMB has a 0.45% expense ratio, which is higher than AMUN's 0.25% expense ratio.
Dividends
FSMB vs. AMUN - Dividend Comparison
FSMB's dividend yield for the trailing twelve months is around 3.15%, more than AMUN's 2.13% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 |
|---|---|---|---|---|---|---|---|---|---|
AMUN abrdn Ultra Short Municipal Income Active ETF | 2.13% | 0.66% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
FSMB First Trust Short Duration Managed Municipal ETF | 3.15% | 3.09% | 2.88% | 2.40% | 1.47% | 1.20% | 1.79% | 2.27% | 0.19% |
Frequently Asked Questions
FSMB and AMUN have a correlation of 0.25, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
On fees, AMUN is cheaper at 0.25% per year. The better choice depends on whether you care most about return, fees, risk, or income.
AMUN is cheaper with a 0.25% expense ratio, compared with 0.45% for FSMB.
FSMB has the higher dividend yield at 3.15%, compared with 2.13% for AMUN.
They also come from different issuers: First Trust and abrdn. Their fees differ too: 0.45% for FSMB and 0.25% for AMUN.
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