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VMBSvsAMUNETF Comparison

ETF 1

VMBS

Vanguard Mortgage-Backed Securities ETF

This fund is part of

MBS & ABS

-0.11%

Full VMBS fund page

VS

ETF 2

AMUN

abrdn Ultra Short Municipal Income Active ETF

This fund is part of

Municipal Bonds

+0.2%

Full AMUN fund page

Vanguard Mortgage-Backed Securities ETF (VMBS) belongs to the MBS & ABS segment. abrdn Ultra Short Municipal Income Active ETF (AMUN) is part of the Municipal Bonds segment. VMBS's top 3 sector exposures are Industrials, Finance and Government Agencies. In contrast, AMUN's top sector exposures are Municipal and Non-Corporate. VMBS is less expensive with a Total Expense Ratio (TER) of 0.03%, versus 0.74% for AMUN. VMBS is down -1.56% year-to-date (YTD) with +$1.65B in YTD flows. AMUN performs better with 2.14% YTD performance, and +$29M in YTD flows. Run a side-by-side ETF comparison of VMBS and AMUN 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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VMBS vs AMUN 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 10/23/2026

		1M	3M	YTD	1Y	3Y	5Y
Perf.	VMBS AMUN	+0.90%+0.34%	-0.77%+0.59%	-1.56%+2.14%	-1.07%+2.72%	+19.19%n/a	+0.51%n/a
Flows	VMBS AMUN	+$101M+$4M	+$687M+$6M	+$1.65B+$29M	+$1.62B+$29M	-$1.53B-	+$2.95B-

Volatility and drawdown

		3M	1Y	3Y	5Y
Volatility	VMBS AMUN	+5.69%+0.48%	+4.39%+0.33%	+5.35%n/a	+6.51%n/a
Max drawdown	VMBS AMUN	-4.22%-0.31%	-5.75%-0.31%	-5.75%n/a	-16.74%n/a
Max drawdown duration	VMBS AMUN	59d36d	236d36d	236dn/a	1398dn/a

Trading data

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	VMBS	AMUN
Last sale 10/23/2026 at 1:30 PM	$45.23	$26.02
Previous close 10/22/2026	$45.30	$26.04
Consolidated volume 10/22/2026
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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	VMBS	AMUN
Tracking error
Tracking difference
1 year cumulative return difference
Best
Worst
Daily return difference
Average
Worst

Main metrics

Last update 10/23/2026 at 1:30 PM

Live

Closed

	VMBS	AMUN
Last price	$45.23	$26.02
1D performance	-0.15%	-0.06%
AuM	$15.87 B	$58.94 M
E/R	0.03%	0.74%

Characteristics

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

More VMBS data on Trackinsight

More AMUN data on Trackinsight

Exposure

Countries

VMBS

USA

26.03%

Other

73.97%

AMUN

USA

27.85%

Other

72.15%

Sectors

VMBS

Industrials

25.62%

Other

74.38%

AMUN

Municipal

27.62%

Other

72.38%

Diversification

VMBS

Total weight of top 15 holdings out of 15

3.67%

AMUN

Total weight of top 15 holdings out of 15

46.38%

Top 15 holdings

Data as of August 31, 2026

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%

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%

Frequently asked questions about VMBS and AMUN

How have the VMBS and AMUN ETFs performed in 2026?

As of October 23, 2026, VMBS is down -1.56% year-to-date (YTD), while AMUN has returned 2.14%. That puts AMUN better performer ahead so far this year.

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

Year-to-date, the VMBS ETF saw +$1.65B in flows, compared to +$29M for AMUN.

Which ETF is more volatile: VMBS or AMUN?

Over the past year, VMBS had a volatility of 4.39%, while AMUN experienced 0.33%.

Which ETF is bigger: VMBS or AMUN?

As of October 23, 2026, VMBS holds $15.87 B in assets under management (AUM), while AMUN manages $58.94 M.

What sectors do the VMBS and AMUN ETFs invest in?

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

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

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

VMBSvsAMUNETF Comparison

Vanguard Mortgage-Backed Securities ETF

abrdn Ultra Short Municipal Income Active ETF

VMBS vs AMUN 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 VMBS and AMUN ETFs performed in 2026?

As of October 23, 2026, VMBS is down -1.56% year-to-date (YTD), while AMUN has returned 2.14%. That puts AMUN better performer ahead so far this year.

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

Year-to-date, the VMBS ETF saw +$1.65B in flows, compared to +$29M for AMUN.

Which ETF is more volatile: VMBS or AMUN?

Over the past year, VMBS had a volatility of 4.39%, while AMUN experienced 0.33%.

Which ETF is bigger: VMBS or AMUN?

As of October 23, 2026, VMBS holds $15.87 B in assets under management (AUM), while AMUN manages $58.94 M.

What sectors do the VMBS and AMUN ETFs invest in?

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

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

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

Which ETF is more diversified: VMBS or AMUN?

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

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