FMUN vs. AMUN

Last updated Jun 4, 2026

FMUN (Fidelity Systematic Municipal Bond Index ETF) and AMUN (abrdn Ultra Short Municipal Income Active ETF) are both Municipal Bonds funds. Both are actively managed. At a 0.24 correlation, their price movements are largely independent. FMUN charges 0.05%/yr vs 0.25%/yr for AMUN.

Performance

FMUN vs. AMUN - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Systematic Municipal Bond Index ETF (FMUN) and abrdn Ultra Short Municipal Income Active ETF (AMUN). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FMUN achieves a 1.69% return, which is significantly higher than AMUN's 1.11% return.

FMUN

• 1D: 0.03%
• 1M: 0.93%
• YTD: 1.69%
• 6M: 2.24%
• 1Y: 7.61%
• 3Y*: —
• 5Y*: —
• 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)

FMUN vs. AMUN - Yearly Performance Comparison

	2026 (YTD)	2025
FMUN Fidelity Systematic Municipal Bond Index ETF	1.69%	0.47%
AMUN abrdn Ultra Short Municipal Income Active ETF	1.11%	0.14%

Correlation

The correlation between FMUN and AMUN is 0.24, 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	0.24

Return for Risk

FMUN vs. AMUN — Risk / Return Rank

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

FMUN

FMUN Risk / Return Rank: 67
FMUN Sharpe Ratio Rank: 75
FMUN Sortino Ratio Rank: 78
FMUN Omega Ratio Rank: 86
FMUN Calmar Ratio Rank: 48
FMUN Martin Ratio Rank: 48

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.

FMUN vs. AMUN - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Systematic Municipal Bond Index ETF (FMUN) 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.

	FMUN	AMUN	Difference
Sharpe ratio: Return per unit of total volatility	2.45	—	—
Sortino ratio: Return per unit of downside risk	3.54	—	—
Omega ratio: Gain probability vs. loss probability	1.53	—	—
Calmar ratio: Return relative to maximum drawdown	2.38	—	—
Martin ratio: Return relative to average drawdown	7.88	—	—
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

	FMUN	AMUN	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.45	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.28	2.05	-0.76

Drawdowns

FMUN vs. AMUN - Drawdown Comparison

The maximum FMUN drawdown since its inception was -3.21%, which is greater than AMUN's maximum drawdown of -0.61%. Use the drawdown chart below to compare losses from any high point for FMUN and AMUN.

Drawdown Indicators

	FMUN	AMUN	Difference
Max Drawdown Largest peak-to-trough decline	-3.21%	-0.61%	-2.60%
Max Drawdown (1Y) Largest decline over 1 year	-3.21%	—	—
Current Drawdown Current decline from peak	-0.66%	-0.02%	-0.64%
Average Drawdown Average peak-to-trough decline	-0.82%	-0.09%	-0.73%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.97%	—	—

Volatility

Volatility by Period

	FMUN	AMUN	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.27%	—	—
Volatility (6M) Calculated over the trailing 6-month period	2.27%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	3.12%	1.01%	+2.11%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.06%	1.01%	+3.05%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.06%	1.01%	+3.05%

FMUN vs. AMUN - Expense Ratio Comparison

FMUN has a 0.05% expense ratio, which is lower than AMUN's 0.25% 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

FMUN vs. AMUN - Dividend Comparison

FMUN's dividend yield for the trailing twelve months is around 3.29%, more than AMUN's 1.89% yield.

Position	TTM	2025
AMUN abrdn Ultra Short Municipal Income Active ETF	1.89%	0.66%
FMUN Fidelity Systematic Municipal Bond Index ETF	3.29%	2.41%

Frequently Asked Questions

Can I hold both FMUN and AMUN in my portfolio?

FMUN and AMUN have a correlation of 0.24, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, FMUN or AMUN?

On fees, FMUN is cheaper at 0.05% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, FMUN or AMUN?

FMUN is cheaper with a 0.05% expense ratio, compared with 0.25% for AMUN.

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

FMUN has the higher dividend yield at 3.29%, compared with 1.89% for AMUN.

What is the main difference between FMUN and AMUN?

They also come from different issuers: Fidelity and abrdn. Their fees differ too: 0.05% for FMUN and 0.25% for AMUN.