BAB vs. AMUN

Last updated Apr 1, 2026

Compare and contrast key facts about Invesco Taxable Municipal Bond ETF (BAB) and abrdn Ultra Short Municipal Income Active ETF (AMUN).

BAB and AMUN are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. BAB is a passively managed fund by Invesco that tracks the performance of the BofA Merrill Lynch Build America Bond Index. It was launched on Nov 17, 2009. AMUN is an actively managed fund by abrdn. It was launched on Oct 20, 2025.

Performance

BAB vs. AMUN - Performance Comparison

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

BAB vs. AMUN - Yearly Performance Comparison

	2026 (YTD)	2025
BAB Invesco Taxable Municipal Bond ETF	0.13%	-0.51%
AMUN abrdn Ultra Short Municipal Income Active ETF	0.54%	0.14%

Returns By Period

In the year-to-date period, BAB achieves a 0.13% return, which is significantly lower than AMUN's 0.54% return.

BAB

• 1D: 0.97%
• 1M: -2.43%
• YTD: 0.13%
• 6M: 0.79%
• 1Y: 5.22%
• 3Y*: 4.12%
• 5Y*: 0.02%
• 10Y*: 2.59%

AMUN

• 1D: 0.02%
• 1M: -0.04%
• YTD: 0.54%
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

BAB vs. AMUN - Expense Ratio Comparison

BAB has a 0.28% expense ratio, which is higher than AMUN's 0.25% expense ratio.

BAB

Invesco Taxable Municipal Bond ETF

AMUN

abrdn Ultra Short Municipal Income Active ETF

Return for Risk

BAB vs. AMUN — Risk / Return Rank

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

BAB

BAB Risk / Return Rank: 43
BAB Sharpe Ratio Rank: 44
BAB Sortino Ratio Rank: 43
BAB Omega Ratio Rank: 36
BAB Calmar Ratio Rank: 50
BAB Martin Ratio Rank: 41

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.

BAB vs. AMUN - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco Taxable Municipal Bond ETF (BAB) 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.

	BAB	AMUN	Difference
Sharpe ratio Return per unit of total volatility	0.79	—	—
Sortino ratio Return per unit of downside risk	1.17	—	—
Omega ratio Gain probability vs. loss probability	1.14	—	—
Calmar ratio Return relative to maximum drawdown	1.27	—	—
Martin ratio Return relative to average drawdown	3.79	—	—
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

	BAB	AMUN	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.79	—	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.00	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.27	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.52	1.39	-0.87

Correlation

The correlation between BAB and AMUN is 0.20, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

BAB vs. AMUN - Dividend Comparison

BAB's dividend yield for the trailing twelve months is around 4.03%, more than AMUN's 1.14% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BAB Invesco Taxable Municipal Bond ETF	4.03%	3.96%	3.97%	3.65%	3.40%	2.63%	2.96%	3.77%	4.20%	3.96%	4.26%	4.71%
AMUN abrdn Ultra Short Municipal Income Active ETF	1.14%	0.66%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Drawdowns

BAB vs. AMUN - Drawdown Comparison

The maximum BAB drawdown since its inception was -27.80%, which is greater than AMUN's maximum drawdown of -0.61%. Use the drawdown chart below to compare losses from any high point for BAB and AMUN.

Drawdown Indicators

	BAB	AMUN	Difference
Max Drawdown Largest peak-to-trough decline	-27.80%	-0.61%	-27.19%
Max Drawdown (1Y) Largest decline over 1 year	-4.50%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-24.95%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-27.80%	—	—
Current Drawdown Current decline from peak	-5.64%	-0.05%	-5.59%
Average Drawdown Average peak-to-trough decline	-5.30%	-0.11%	-5.19%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.50%	—	—

Volatility

Volatility by Period

	BAB	AMUN	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.16%	—	—
Volatility (6M) Calculated over the trailing 6-month period	3.90%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	6.62%	1.12%	+5.50%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	8.31%	1.12%	+7.19%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	9.70%	1.12%	+8.58%