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AMUNvsVMBSETF Comparison

ETF 1

AMUN

abrdn Ultra Short Municipal Income Active ETF

This fund is part of

Municipal Bonds

-0%

Full AMUN fund page

VS

ETF 2

VMBS

Vanguard Mortgage-Backed Securities ETF

This fund is part of

MBS & ABS

-0.03%

Full VMBS fund page

abrdn Ultra Short Municipal Income Active ETF (AMUN) belongs to the Municipal Bonds segment. Vanguard Mortgage-Backed Securities ETF (VMBS) is part of the MBS & ABS segment. AMUN's top 2 sector exposures are Municipal and Non-Corporate. In contrast, VMBS's top sector exposures are Industrials, Finance and Government Agencies. AMUN is more expensive with a Total Expense Ratio (TER) of 0.74%, versus 0.03% for VMBS. AMUN is up 1.98% year-to-date (YTD) with +$29M in YTD flows. VMBS performs worse with -2.15% YTD performance, and +$1.63B in YTD flows. Run a side-by-side ETF comparison of AMUN and VMBS 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 VMBS performance and flow charts

Performance

Cumulative Flows

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Daily, global ETF data for advanced analysis or integration into apps (API), from our partner Trackinsight.

Data Services

Historic performance and flows

Data as of 10/16/2026

		1M	3M	YTD	1Y	3Y	5Y
Perf.	AMUN VMBS	+0.10%-0.19%	+0.44%-2.25%	+1.98%-2.15%	+2.58%-1.72%	n/a+16.80%	n/a-0.21%
Flows	AMUN VMBS	+$3M+$148M	+$5M+$692M	+$29M+$1.63B	+$58M+$1.24B	--$931M	-+$2.96B

Volatility and drawdown

		3M	1Y	3Y	5Y
Volatility	AMUN VMBS	+0.47%+5.39%	+0.32%+4.28%	n/a+5.37%	n/a+6.49%
Max drawdown	AMUN VMBS	-0.31%-4.22%	-0.31%-5.75%	n/a-5.75%	n/a-16.74%
Max drawdown duration	AMUN VMBS	36d52d	36d229d	n/a229d	n/a1398d

Trading data

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	AMUN	VMBS
Last sale 10/19/2026 at 4:02 PM	$26.01	$44.73
Previous close 10/16/2026	$26.00	$44.91
Consolidated volume 10/16/2026
Average volume 30 days
Average discount or premium 30 days
Average Bid/Ask spread 30 days

Replication quality

Data as of September 30, 2026

1-year trailing difference

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AMUN

is actively managed and doesn’t replicate an index

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	AMUN	VMBS
Tracking error
Tracking difference
1 year cumulative return difference
Best
Worst
Daily return difference
Average
Worst

Main metrics

Last update 10/19/2026 at 4:02 PM

Live

Closed

	AMUN	VMBS
Last price	$26.01	$44.73
1D performance	+0.02%	-0.40%
AuM	$58.20 M	$15.75 B
E/R	0.74%	0.03%

Characteristics

	AMUN	VMBS
Management strategy	Active	Passive
Provider	abrdn	Vanguard
Benchmark	-	Bloomberg U.S. MBS Float Adjusted Index
N° of holdings	18	698
Asset class	-	Bonds
Trailing 12m distribution yield	Join	Join
Inception date	October 17, 2025	November 19, 2009
ESG	No	No

More AMUN data on Trackinsight

More VMBS data on Trackinsight

Exposure

Countries

AMUN

USA

27.85%

Other

72.15%

VMBS

USA

26.03%

Other

73.97%

Sectors

AMUN

Municipal

27.62%

Other

72.38%

VMBS

Industrials

25.62%

Other

74.38%

Diversification

AMUN

Total weight of top 15 holdings out of 15

46.38%

VMBS

Total weight of top 15 holdings out of 15

3.67%

Top 15 holdings

Data as of August 31, 2026

AMUN

US46640KYU23

3.99%

US230589AB90

3.68%

Chandler Industrial Development Authority, 5% 1sep2052, USD (2022-2)

3.66%

Newark, 4.25% 5may2027, USD (2026)

3.64%

US478232SD45

3.64%

US88035TZV50

3.62%

US7386297S79

3.62%

US64972GU289

3.26%

Mississippi Business Finance Corp., FRN 1nov2032, USD (2007A)

2.97%

US414008CX87

2.67%

Main Street Natural Gas Inc., 4% 1may2052, USD

2.59%

US546598AB98

2.54%

PEFA Inc., 5% 1sep2049, USD (2019)

2.27%

US06964KAB26

2.17%

US20774YV531

2.06%

VMBS

G2 MB0025, 5% 20nov2054, USD (ABS)

0.28%

US3618N56H72

0.28%

US3618N6K636

0.26%

US3618N6BE68

0.26%

US3140Y9B864

0.26%

G2 MB0024, 4.5% 20nov2054, USD (ABS)

0.25%

US21H0606A46

0.25%

US3132E0TL66

0.25%

US3142J6DY61

0.24%

US3618N6HU47

0.23%

FR SD8146, 2% 1may2051, USD (ABS)

0.23%

US3618N6FL65

0.23%

US01F0526982

0.22%

US3142J6C840

0.22%

FR RQ0056, 5.5% 1oct2055, USD (ABS)

0.21%

Frequently asked questions about AMUN and VMBS

How have the AMUN and VMBS ETFs performed in 2026?

As of October 16, 2026, AMUN is up 1.98% year-to-date (YTD), while VMBS has lost -2.15%. That puts AMUN better performer ahead so far this year.

Which ETF is attracting more investor money: AMUN or VMBS?

Year-to-date, the AMUN ETF saw +$29M in flows, compared to +$1.63B for VMBS.

Which ETF is more volatile: AMUN or VMBS?

Over the past year, AMUN had a volatility of 0.32%, while VMBS experienced 4.28%.

Which ETF is bigger: AMUN or VMBS?

As of October 16, 2026, AMUN holds $58.20 M in assets under management (AUM), while VMBS manages $15.75 B.

What sectors do the AMUN and VMBS ETFs invest in?

AMUN leans toward sectors like Municipal. Meanwhile, VMBS focuses on Industrials.

What are the top holdings of the AMUN ETF and VMBS ETF?

AMUN top holdings include US46640KYU23, US230589AB90 and Chandler Industrial Development Authority, 5% 1sep2052, USD (2022-2). VMBS holds in its top three: G2 MB0025, 5% 20nov2054, USD (ABS), US3618N56H72 and US3618N6K636.

AMUNvsVMBSETF Comparison

abrdn Ultra Short Municipal Income Active ETF

Vanguard Mortgage-Backed Securities ETF

AMUN vs VMBS performance and flow charts

Performance

Cumulative Flows

Get all the metrics on this page, and more, through a reliable ETF data feed

Countries

Sectors

Diversification

Top 15 holdings

How have the AMUN and VMBS ETFs performed in 2026?

As of October 16, 2026, AMUN is up 1.98% year-to-date (YTD), while VMBS has lost -2.15%. That puts AMUN better performer ahead so far this year.

Which ETF is attracting more investor money: AMUN or VMBS?

Year-to-date, the AMUN ETF saw +$29M in flows, compared to +$1.63B for VMBS.

Which ETF is more volatile: AMUN or VMBS?

Over the past year, AMUN had a volatility of 0.32%, while VMBS experienced 4.28%.

Which ETF is bigger: AMUN or VMBS?

As of October 16, 2026, AMUN holds $58.20 M in assets under management (AUM), while VMBS manages $15.75 B.

What sectors do the AMUN and VMBS ETFs invest in?

AMUN leans toward sectors like Municipal. Meanwhile, VMBS focuses on Industrials.

What are the top holdings of the AMUN ETF and VMBS ETF?

AMUN top holdings include US46640KYU23, US230589AB90 and Chandler Industrial Development Authority, 5% 1sep2052, USD (2022-2). VMBS holds in its top three: G2 MB0025, 5% 20nov2054, USD (ABS), US3618N56H72 and US3618N6K636.

Which ETF is more diversified: AMUN or VMBS?

AMUN holds 68 securities with 46.38% of its assets in the top 15. VMBS has 4834 securities and a top 15 weight of 3.67%.

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