AMUN vs. IBMM

Last updated Apr 1, 2026

Compare and contrast key facts about abrdn Ultra Short Municipal Income Active ETF (AMUN) and iShares iBonds Dec 2024 Term Muni Bond ETF (IBMM).

AMUN and IBMM are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. AMUN is an actively managed fund by abrdn. It was launched on Oct 20, 2025. IBMM is a passively managed fund by iShares that tracks the performance of the S&P AMT-Free Municipal Series Dec 2024 Index. It was launched on Mar 20, 2018.

Performance

AMUN vs. IBMM - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in abrdn Ultra Short Municipal Income Active ETF (AMUN) and iShares iBonds Dec 2024 Term Muni Bond ETF (IBMM). The values are adjusted to include any dividend payments, if applicable.

AMUN vs. IBMM - Yearly Performance Comparison

	2026 (YTD)
AMUN abrdn Ultra Short Municipal Income Active ETF	0.19%
IBMM iShares iBonds Dec 2024 Term Muni Bond ETF	0.00%

Returns By Period

AMUN

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

IBMM

• 1D: 0.00%
• 1M: 0.00%
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

AMUN vs. IBMM - Expense Ratio Comparison

AMUN has a 0.25% expense ratio, which is higher than IBMM's 0.18% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

AMUN

abrdn Ultra Short Municipal Income Active ETF

IBMM

iShares iBonds Dec 2024 Term Muni Bond ETF

Return for Risk

AMUN vs. IBMM - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for abrdn Ultra Short Municipal Income Active ETF (AMUN) and iShares iBonds Dec 2024 Term Muni Bond ETF (IBMM). 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.

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

Sharpe Ratios by Period

	AMUN	IBMM	Difference
Sharpe Ratio (All Time) Calculated using the full available price history	1.39	—	—

Dividends

AMUN vs. IBMM - Dividend Comparison

AMUN's dividend yield for the trailing twelve months is around 1.14%, while IBMM has not paid dividends to shareholders.

	TTM	2025
AMUN abrdn Ultra Short Municipal Income Active ETF	1.14%	0.66%
IBMM iShares iBonds Dec 2024 Term Muni Bond ETF	0.00%	0.00%

Drawdowns

AMUN vs. IBMM - Drawdown Comparison

The maximum AMUN drawdown since its inception was -0.61%, which is greater than IBMM's maximum drawdown of 0.00%. Use the drawdown chart below to compare losses from any high point for AMUN and IBMM.

Drawdown Indicators

	AMUN	IBMM	Difference
Max Drawdown Largest peak-to-trough decline	-0.61%	0.00%	-0.61%
Current Drawdown Current decline from peak	-0.05%	0.00%	-0.05%
Average Drawdown Average peak-to-trough decline	-0.11%	0.00%	-0.11%

Volatility

Volatility by Period

	AMUN	IBMM	Difference
Volatility (1Y) Calculated over the trailing 1-year period	1.12%	0.00%	+1.12%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.12%	0.00%	+1.12%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.12%	0.00%	+1.12%