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MBBvsVMBSETF Comparison

ETF 1

MBB

iShares MBS ETF

This fund is part of

MBS & ABS

-0.1%

Full MBB fund page

VS

ETF 2

VMBS

Vanguard Mortgage-Backed Securities ETF

This fund is part of

MBS & ABS

-0.1%

Full VMBS fund page

iShares MBS ETF (MBB) and Vanguard Mortgage-Backed Securities ETF (VMBS) belong to the same industry segment: MBS & ABS. MBB's top 3 sector exposures are Industrials, Non-Corporate and Finance. In contrast, VMBS's top sector exposures are Industrials, Finance and Government Agencies. MBB is more expensive with a Total Expense Ratio (TER) of 0.04%, versus 0.03% for VMBS. MBB is down -1.03% year-to-date (YTD) with -$1.79B in YTD flows. VMBS performs worse with -1.56% YTD performance, and +$1.65B in YTD flows. Run a side-by-side ETF comparison of MBB 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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MBB 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 10/23/2026

		1M	3M	YTD	1Y	3Y	5Y
Perf.	MBB VMBS	+1.09%+0.90%	-0.64%-0.77%	-1.03%-1.56%	-0.66%-1.07%	+19.63%+19.19%	+0.48%+0.51%
Flows	MBB VMBS	-$3.31B+$101M	-$2.66B+$687M	-$1.79B+$1.65B	-$4.86B+$1.62B	+$7.95B-$1.53B	+$13.59B+$2.95B

Volatility and drawdown

		3M	1Y	3Y	5Y
Volatility	MBB VMBS	+5.98%+5.69%	+4.70%+4.39%	+5.71%+5.35%	+6.68%+6.51%
Max drawdown	MBB VMBS	-4.27%-4.22%	-5.38%-5.75%	-5.38%-5.75%	-16.94%-16.74%
Max drawdown duration	MBB VMBS	59d59d	236d236d	236d236d	1405d1398d

Trading data

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	MBB	VMBS
Last sale 10/26/2026 at 1:30 PM	$91.52	$45.32
Previous close 10/23/2026	$91.29	$45.23
Consolidated volume 10/23/2026
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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	MBB	VMBS
Tracking error
Tracking difference
1 year cumulative return difference
Best
Worst
Daily return difference
Average
Worst

Main metrics

Last update 10/26/2026 at 1:30 PM

Live

Closed

	MBB	VMBS
Last price	$91.52	$45.32
1D performance	+0.25%	+0.20%
AuM	$35.54 B	$15.87 B
E/R	0.04%	0.03%

Characteristics

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

More MBB data on Trackinsight

More VMBS data on Trackinsight

Exposure

Countries

MBB

USA

28.44%

Other

71.56%

VMBS

USA

26.03%

Other

73.97%

Sectors

MBB

Industrials

20.61%

Non-Corporate

7.6%

Other

71.79%

VMBS

Industrials

25.62%

Other

74.38%

Diversification

MBB

Total weight of top 15 holdings out of 15

16.82%

VMBS

Total weight of top 15 holdings out of 15

3.67%

Top 15 holdings

Data as of August 31, 2026

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%

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 MBB and VMBS

How have the MBB and VMBS ETFs performed in 2026?

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

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

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

Which ETF is more volatile: MBB or VMBS?

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

Which ETF is bigger: MBB or VMBS?

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

What sectors do the MBB and VMBS ETFs invest in?

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

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

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

Which ETF is more diversified: MBB or VMBS?

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

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

MBBvsVMBSETF Comparison

iShares MBS ETF

Vanguard Mortgage-Backed Securities ETF

MBB 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 MBB and VMBS ETFs performed in 2026?

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

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

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

Which ETF is more volatile: MBB or VMBS?

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

Which ETF is bigger: MBB or VMBS?

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

What sectors do the MBB and VMBS ETFs invest in?

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

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

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

Which ETF is more diversified: MBB or VMBS?

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

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

NYSE x ETF Central ETF Education Series

ETFs’ Next Act: From Access to Selection