FSMB vs. AMUN

Last updated Jun 4, 2026

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 0.22 correlation, their price movements are largely independent. FSMB charges 0.45%/yr vs 0.25%/yr for AMUN.

Performance

FSMB vs. AMUN - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in First Trust Short Duration Managed Municipal ETF (FSMB) and abrdn Ultra Short Municipal Income Active ETF (AMUN). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with FSMB having a 1.15% return and AMUN slightly lower at 1.11%.

FSMB

• 1D: 0.05%
• 1M: 0.44%
• YTD: 1.15%
• 6M: 1.51%
• 1Y: 4.18%
• 3Y*: 3.56%
• 5Y*: 1.51%
• 10Y*: —

AMUN

• 1D: -0.02%
• 1M: 0.32%
• YTD: 1.11%
• 6M: 1.36%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

*Multi-year figures are annualized to reflect compound growth (CAGR)

FSMB vs. AMUN - Yearly Performance Comparison

	2026 (YTD)	2025
FSMB First Trust Short Duration Managed Municipal ETF	1.15%	0.51%
AMUN abrdn Ultra Short Municipal Income Active ETF	1.11%	0.14%

Correlation

The correlation between FSMB and AMUN is 0.22, 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 21, 2025	0.22

Return for Risk

FSMB vs. AMUN — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

FSMB

FSMB Risk / Return Rank: 80
FSMB Sharpe Ratio Rank: 88
FSMB Sortino Ratio Rank: 92
FSMB Omega Ratio Rank: 92
FSMB Calmar Ratio Rank: 66
FSMB Martin Ratio Rank: 62

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

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.

	FSMB	AMUN	Difference
Sharpe ratio: Return per unit of total volatility	2.99	—	—
Sortino ratio: Return per unit of downside risk	4.48	—	—
Omega ratio: Gain probability vs. loss probability	1.63	—	—
Calmar ratio: Return relative to maximum drawdown	3.26	—	—
Martin ratio: Return relative to average drawdown	11.17	—	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

Sharpe Ratios by Period

	FSMB	AMUN	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.99	—	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.78	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.75	2.05	-1.30

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.

Drawdown Indicators

	FSMB	AMUN	Difference
Max Drawdown Largest 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 Drawdown Current decline from peak	-0.25%	-0.02%	-0.23%
Average Drawdown Average peak-to-trough decline	-1.16%	-0.09%	-1.07%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.37%	—	—

Volatility

Volatility by Period

	FSMB	AMUN	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.42%	—	—
Volatility (6M) Calculated over the trailing 6-month period	1.02%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	1.40%	1.01%	+0.39%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.96%	1.01%	+0.95%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.92%	1.01%	+1.91%

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 3.14%, more than AMUN's 1.89% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018
AMUN abrdn Ultra Short Municipal Income Active ETF	1.89%	0.66%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
FSMB First Trust Short Duration Managed Municipal ETF	3.14%	3.09%	2.88%	2.40%	1.47%	1.20%	1.79%	2.27%	0.19%

Frequently Asked Questions

Can I hold both FSMB and AMUN in my portfolio?

FSMB and AMUN have a correlation of 0.22, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, FSMB or AMUN?

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.

Which ETF is cheaper, FSMB or AMUN?

AMUN is cheaper with a 0.25% expense ratio, compared with 0.45% for FSMB.

Which ETF pays a higher dividend yield, FSMB or AMUN?

FSMB has the higher dividend yield at 3.14%, compared with 1.89% for AMUN.

What is the main difference between FSMB and AMUN?

They also come from different issuers: First Trust and abrdn. Their fees differ too: 0.45% for FSMB and 0.25% for AMUN.