AMUNvsMBBAETF Comparison
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abrdn Ultra Short Municipal Income Active ETF (AMUN) belongs to the Municipal Bonds segment. iShares Mortgage-Backed Securities Active ETF (MBBA) is part of the MBS & ABS segment. AMUN's top 2 sector exposures are Municipal and Non-Corporate. In contrast, MBBA's top sector exposures are Industrials and Non-Corporate. AMUN is more expensive with a Total Expense Ratio (TER) of 0.74%, versus 0.26% for MBBA. Run a side-by-side ETF comparison of AMUN and MBBA below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.
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AMUN vs MBBA performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/02/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | AMUN MBBA | +0.24%-0.09% | +0.65%-1.02% | +1.88%n/a | n/an/a | n/an/a | n/an/a |
| Flows | AMUN MBBA | +$2M+$5M | +$1M+$35M | +$25M- | -- | -- | -- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | AMUN MBBA | +0.34%+4.75% | n/an/a | n/an/a | n/an/a |
| Max drawdown | AMUN MBBA | -0.03%-2.02% | n/an/a | n/an/a | n/an/a |
| Max drawdown duration | AMUN MBBA | 2d65d | n/an/a | n/an/a | n/an/a |
Trading data
AMUN | MBBA | |
Last sale 9/2/2026 at 5:24 PM | $26.05 | $48.65 |
| Previous close 09/02/2026 | $26.04 | $48.54 |
| Consolidated volume 09/02/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
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Main metrics
Last update 9/2/2026 at 5:24 PM
Live
Closed
AMUN | MBBA | |
|---|---|---|
| Last price | $26.05 | $48.65 |
| 1D performance | +0.06% | +0.24% |
| AuM | $55.04 M | $156.37 M |
| E/R | 0.74% | 0.26% |
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Exposure
Countries
AMUN
USA
33.29%
Other
66.71%
MBBA
Data will be available soon
Sectors
AMUN
Municipal
33.11%
Other
66.89%
MBBA
Data will be available soon
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Diversification
AMUN
Total weight of top 15 holdings out of 15
53.8%
MBBA
Data will be available soon
Top 15 holdings
Data as of July 31, 2026
AMUN
Massachusetts Port Authority, 5% 1jul2043, USD (2016-B)
4.70%
Tennessee Energy Acquisition Corp., 5.625% 1sep2026, USD
4.14%
US46640KYU23
4.13%
US546598AA16
3.95%
US230589AB90
3.81%
Chandler Industrial Development Authority, 5% 1sep2052, USD (2022-2)
3.79%
Newark, 4.25% 5may2027, USD (2026)
3.77%
US478232SD45
3.77%
US34074EAF60
3.76%
US88035TZV50
3.76%
US7386297S79
3.75%
Mississippi Business Finance Corp., FRN 1nov2032, USD (2007A)
3.08%
US414008CX87
2.77%
PEFA Inc., 5% 1sep2049, USD (2019)
2.35%
US06964KAB26
2.26%
MBBA
Data will be available soon
Frequently asked questions about AMUN and MBBA
Which ETF is bigger: AMUN or MBBA?
As of September 2, 2026, AMUN holds $55.04 M in assets under management (AUM), while MBBA manages $156.37 M.
What sectors do the AMUN and MBBA ETFs invest in?
AMUN leans toward sectors like Municipal. Meanwhile, MBBA focuses on Industrials and Non-Corporate.
What are the top holdings of the AMUN ETF and MBBA ETF?
AMUN top holdings include Massachusetts Port Authority, 5% 1jul2043, USD (2016-B), Tennessee Energy Acquisition Corp., 5.625% 1sep2026, USD and US46640KYU23. MBBA holds in its top three: US01F0526800, US01F0206874 and BlackRock Liquidity T-Fund.
Which ETF is more diversified: AMUN or MBBA?
AMUN holds 63 securities with 53.8% of its assets in the top 15. MBBA has 491 securities and a top 15 weight of 89.36%.
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