IBMM vs. AMUN

Last updated Jun 3, 2026

IBMM (iShares iBonds Dec 2024 Term Muni Bond ETF) and AMUN (abrdn Ultra Short Municipal Income Active ETF) are both Municipal Bonds funds. IBMM is passively managed, while AMUN is actively managed. IBMM charges 0.18%/yr vs 0.25%/yr for AMUN.

Performance

IBMM vs. AMUN - Performance Comparison

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

Returns By Period

IBMM

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

AMUN

• 1D: 0.08%
• 1M: 0.34%
• YTD: 1.13%
• 6M: 1.40%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

IBMM vs. AMUN - Yearly Performance Comparison

	2026 (YTD)
IBMM iShares iBonds Dec 2024 Term Muni Bond ETF	0.00%
AMUN abrdn Ultra Short Municipal Income Active ETF	0.79%

Return for Risk

IBMM vs. AMUN - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares iBonds Dec 2024 Term Muni Bond ETF (IBMM) 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.

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

Sharpe Ratios by Period

	IBMM	AMUN	Difference
Sharpe Ratio (All Time) Calculated using the full available price history	—	2.09	—

Drawdowns

IBMM vs. AMUN - Drawdown Comparison

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

Drawdown Indicators

	IBMM	AMUN	Difference
Max Drawdown Largest peak-to-trough decline	0.00%	-0.61%	+0.61%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	0.00%	-0.09%	+0.09%

Volatility

Volatility by Period

	IBMM	AMUN	Difference
Volatility (1Y) Calculated over the trailing 1-year period	0.00%	1.01%	-1.01%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.00%	1.01%	-1.01%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.00%	1.01%	-1.01%

IBMM vs. AMUN - Expense Ratio Comparison

IBMM has a 0.18% 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

IBMM vs. AMUN - Dividend Comparison

IBMM has not paid dividends to shareholders, while AMUN's dividend yield for the trailing twelve months is around 1.89%.

Position	TTM	2025
AMUN abrdn Ultra Short Municipal Income Active ETF	1.89%	0.66%
IBMM iShares iBonds Dec 2024 Term Muni Bond ETF	0.00%	0.00%

Frequently Asked Questions

Which ETF is better, IBMM or AMUN?

On fees, IBMM is cheaper at 0.18% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, IBMM or AMUN?

IBMM is cheaper with a 0.18% expense ratio, compared with 0.25% for AMUN.

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

AMUN has the higher dividend yield at 1.89%, compared with 0.00% for IBMM.

What is the main difference between IBMM and AMUN?

They also come from different issuers: iShares and abrdn. Their fees differ too: 0.18% for IBMM and 0.25% for AMUN.