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VMBSvsMBBETF 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

MBB

iShares MBS ETF

This fund is part of

MBS & ABS

-0.11%

Full MBB fund page

Vanguard Mortgage-Backed Securities ETF (VMBS) and iShares MBS ETF (MBB) belong to the same industry segment: MBS & ABS. VMBS's top 3 sector exposures are Industrials, Finance and Government Agencies. In contrast, MBB's top sector exposures are Industrials, Non-Corporate and Finance. VMBS is less expensive with a Total Expense Ratio (TER) of 0.03%, versus 0.04% for MBB. VMBS is down -1.56% year-to-date (YTD) with +$1.65B in YTD flows. MBB performs better with -1.03% YTD performance, and -$1.79B in YTD flows. Run a side-by-side ETF comparison of VMBS and MBB 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 MBB 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 MBB	+0.90%+1.09%	-0.77%-0.64%	-1.56%-1.03%	-1.07%-0.66%	+19.19%+19.63%	+0.51%+0.48%
Flows	VMBS MBB	+$101M-$3.31B	+$687M-$2.66B	+$1.65B-$1.79B	+$1.62B-$4.86B	-$1.53B+$7.95B	+$2.95B+$13.59B

Volatility and drawdown

		3M	1Y	3Y	5Y
Volatility	VMBS MBB	+5.69%+5.98%	+4.39%+4.70%	+5.35%+5.71%	+6.51%+6.68%
Max drawdown	VMBS MBB	-4.22%-4.27%	-5.75%-5.38%	-5.75%-5.38%	-16.74%-16.94%
Max drawdown duration	VMBS MBB	59d59d	236d236d	236d236d	1398d1405d

Trading data

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	VMBS	MBB
Last sale 10/23/2026 at 1:30 PM	$45.23	$91.29
Previous close 10/22/2026	$45.30	$91.38
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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	VMBS	MBB
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	MBB
Last price	$45.23	$91.29
1D performance	-0.15%	-0.10%
AuM	$15.87 B	$35.54 B
E/R	0.03%	0.04%

Characteristics

	VMBS	MBB
Management strategy	Passive	Passive
Provider	Vanguard	iShares
Benchmark	Bloomberg U.S. MBS Float Adjusted Index	Bloomberg U.S. MBS Index
N° of holdings	698	1237
Asset class	Bonds	Bonds
Trailing 12m distribution yield	Join	Join
Inception date	November 19, 2009	March 13, 2007
ESG	No	No

More VMBS data on Trackinsight

More MBB data on Trackinsight

Exposure

Countries

VMBS

USA

26.03%

Other

73.97%

MBB

USA

28.44%

Other

71.56%

Sectors

VMBS

Industrials

25.62%

Other

74.38%

MBB

Industrials

20.61%

Non-Corporate

7.6%

Other

71.79%

Diversification

VMBS

Total weight of top 15 holdings out of 15

3.67%

MBB

Total weight of top 15 holdings out of 15

16.82%

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%

MBB

BlackRock Cash Funds - Institutional

7.60%

US01F0526982

1.26%

US21H0526945

1.05%

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

0.98%

US01F0506927

0.87%

US21H0606978

0.63%

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

0.55%

US21H0506988

0.55%

G2 MA7648, 2% 20oct2051, USD (ABS)

0.51%

US36179WTX64

0.50%

FN MA4492, 2% 1dec2051, USD (ABS)

0.49%

US36179WJR07

0.48%

US21H0426955

0.48%

FR SD8140, 2% 1apr2051, USD (ABS)

0.47%

FN MA4465, 2% 1nov2051, USD (ABS)

0.42%

Frequently asked questions about VMBS and MBB

How have the VMBS and MBB ETFs performed in 2026?

As of October 23, 2026, VMBS is down -1.56% year-to-date (YTD), while MBB has lost -1.03%. That puts MBB better performer ahead so far this year.

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

Year-to-date, the VMBS ETF saw +$1.65B in flows, compared to -$1.79B for MBB.

Which ETF is more volatile: VMBS or MBB?

Over the past year, VMBS had a volatility of 4.39%, while MBB experienced 4.7%.

Which ETF is bigger: VMBS or MBB?

As of October 23, 2026, VMBS holds $15.87 B in assets under management (AUM), while MBB manages $35.54 B.

What sectors do the VMBS and MBB ETFs invest in?

VMBS leans toward sectors like Industrials. Meanwhile, MBB focuses on Industrials and Non-Corporate.

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

VMBS top holdings include G2 MB0025, 5% 20nov2054, USD (ABS), US3618N56H72 and US3618N6K636. MBB holds in its top three: BlackRock Cash Funds - Institutional, US01F0526982 and US21H0526945.

Which ETF is more diversified: VMBS or MBB?

VMBS holds 4834 securities with 3.67% of its assets in the top 15. MBB has 9405 securities and a top 15 weight of 16.82%.

The Weekly ETF Market Monitor (September 28-October 2, 2026)

October 2, 2026

MBB

NYSE x ETF Central ETF Education Series

March 5, 2024

MBB

VMBSvsMBBETF Comparison

Vanguard Mortgage-Backed Securities ETF

iShares MBS ETF

VMBS vs MBB 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 MBB ETFs performed in 2026?

As of October 23, 2026, VMBS is down -1.56% year-to-date (YTD), while MBB has lost -1.03%. That puts MBB better performer ahead so far this year.

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

Year-to-date, the VMBS ETF saw +$1.65B in flows, compared to -$1.79B for MBB.

Which ETF is more volatile: VMBS or MBB?

Over the past year, VMBS had a volatility of 4.39%, while MBB experienced 4.7%.

Which ETF is bigger: VMBS or MBB?

As of October 23, 2026, VMBS holds $15.87 B in assets under management (AUM), while MBB manages $35.54 B.

What sectors do the VMBS and MBB ETFs invest in?

VMBS leans toward sectors like Industrials. Meanwhile, MBB focuses on Industrials and Non-Corporate.

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

VMBS top holdings include G2 MB0025, 5% 20nov2054, USD (ABS), US3618N56H72 and US3618N6K636. MBB holds in its top three: BlackRock Cash Funds - Institutional, US01F0526982 and US21H0526945.

Which ETF is more diversified: VMBS or MBB?

VMBS holds 4834 securities with 3.67% of its assets in the top 15. MBB has 9405 securities and a top 15 weight of 16.82%.

The Weekly ETF Market Monitor (September 28-October 2, 2026)

NYSE x ETF Central ETF Education Series

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