Which returned more over the last year, MBB or VMBS?

In the year to Oct 9, 2026, with distributions reinvested, MBB returned −1.2% and VMBS −0.9%.

Which is cheaper, MBB or VMBS?

VMBS is cheaper, by 0.01 percentage points a year. That is about $1 on $10,000 held for a year. Fees come from each fund's prospectus.

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MBB vs VMBS: Differences, Returns & Fees

On May 31, 2026 MBB's duration was 5.4 years and VMBS's 5.2; VMBS charges 0.03% to MBB's 0.04%. Net assets: $35.6bn on Oct 9, 2026 for iShares MBS ETF, and $15.5bn on Sep 30, 2026 for Vanguard Mortgage-Backed Securities ETF.

VMBS costs 0.01 points a year less; their one-year returns differ by 0.3 points; MBB is 2.3 times larger.

	MBB	VMBS
Expense ratio	0.04%	0.03%
Net assets, as of Sep 30, 2026	$36.2bn	$15.5bn
Total return, 1 year	−1.2%	−0.9%
What it tracks	Bloomberg U.S. MBS Index	not read by ETFIQ
Holdings in common	17%
Below its high	4.6%, high on Feb 27, 2026	4.3%, high on Feb 27, 2026

Holdings in common uses holdings dated May 31, 2026.

−1.2%

MBB total return, 1 year

−0.9%

VMBS total return, 1 year

0.04%

MBB expense ratio

0.03%

VMBS expense ratio

What they hold in common

By the books each fund has filed, MBB and VMBS hold 17% of their money in the same securities at the same weight. Above 50%, holding both is close to holding one of them twice. Holdings dated May 31, 2026.

50%

half

17% in common

Positions both hold, largest shared weight first

Holding MBB VMBS

Ginnie Mae II Pool, due Nov 20, 2054 0.55% 0.32%

Ginnie Mae, due Jun 20, 2056 0.95% 0.29%

Freddie Mac Pool, due May 1, 2051 1.05% 0.26%

Freddie Mac Pool, due Mar 1, 2051 0.22% 0.20%

Uniform Mortgage-Backed Security, TBA, due Jun 1, 2056 0.34% 0.20%

Ginnie Mae II Pool, due Jan 20, 2052 0.31% 0.20%

Fannie Mae Pool, due Apr 1, 2051 0.30% 0.18%

Freddie Mac Pool, due Dec 1, 2051 0.24% 0.16%

Ginnie Mae II Pool, due Dec 20, 2054 0.20% 0.16%

Ginnie Mae, due Jun 20, 2056 0.67% 0.15%

Uniform Mortgage-Backed Security, TBA, due Jun 1, 2056 0.83% 0.15%

Fannie Mae Pool, due Jul 1, 2051 0.15% 0.18%

Only in MBB

Ginnie Mae II Pool, due Dec 20, 2051 0.53%

Fannie Mae Pool, due Dec 1, 2051 0.52%

Ginnie Mae, due Jun 20, 2056 0.46%

Fannie Mae Pool, due Nov 1, 2051 0.44%

Fannie Mae Pool, due Jul 1, 2051 0.44%

Fannie Mae Pool, due Apr 1, 2052 0.33%

Fannie Mae Pool, due Mar 1, 2051 0.33%

Ginnie Mae II Pool, due Jul 20, 2054 0.28%

Only in VMBS

G2SF 5.5 7/26, due Jul 20, 2026 0.36%

FN CC2762, due Mar 1, 2056 0.29%

FR SD4155, due Feb 1, 2052 0.27%

FR RQ0118, due May 1, 2056 0.27%

FNCL 3 6/26, due Jun 11, 2026 0.25%

FR RQ0094, due Feb 1, 2056 0.24%

FR RQ0056, due Oct 1, 2055 0.24%

G2 MB0624, due Sep 20, 2055 0.20%

Check overlap with more funds →

On the same fields

MBB

iShares MBS ETF

VMBS

Vanguard Mortgage-Backed Securities ETF

Where it sits Bond ETF Bond ETF

Issuer iShares Vanguard

What it is Tracks an index of mortgage-backed securities Tracks an index

Total return, 1 year −1.2% −0.9%

S&P 500 over the same days +17.3% +17.3%

Gap to the S&P 500 −18.5 pts −18.1 pts

Expense ratio 0.04% 0.03%

Holdings 10855 4890

Net assets, MBB as of Oct 9, 2026 and VMBS as of Sep 30, 2026 $35.6bn $15.5bn

MBB and VMBS on the fields both publish, as of Oct 9, 2026. Source: ETFIQ.

MBB in plain words

MBB tracks an index of mortgage-backed securities. The prospectus expense ratio is 0.04% a year. It sat 4.6% below its high of Feb 27, 2026 on Oct 9, 2026.

Over the year to Oct 9, 2026 it returned −1.2% with distributions reinvested, against −1.4% for its benchmark, the Bloomberg U.S. MBS Index.

VMBS in plain words

VMBS tracks an index. Over the year to Oct 9, 2026 it returned −0.9% with distributions reinvested. The prospectus expense ratio is 0.03% a year. It sat 4.3% below its high of Feb 27, 2026 on Oct 9, 2026.

Questions people ask

Which returned more over the last year, MBB or VMBS?: In the year to Oct 9, 2026, with distributions reinvested, MBB returned −1.2% and VMBS −0.9%.
Which is cheaper, MBB or VMBS?: VMBS is cheaper, by 0.01 percentage points a year. That is about $1 on $10,000 held for a year. Fees come from each fund's prospectus.

Other comparisons

MBB vs SPMB JMBS vs MBB MBB vs SMBS FSEC vs MBB FSEC vs VMBS JMBS vs VMBS SMBS vs VMBS PMBS vs VMBS

MBB on its own →VMBS on its own →Hold both: look the portfolio through →Rankings →Standards and sources →

Where these figures came from

MBB filings on SEC EDGAR ↗MBB prospectus with the expense ratio (SEC) ↗iShares page for MBB ↗VMBS filings on SEC EDGAR ↗VMBS prospectus with the expense ratio (SEC) ↗Vanguard page for VMBS ↗

ETFIQ links to the documents behind every figure; a link is not an endorsement. A comparison is not a recommendation.

How this is computed

Overlap adds up the smaller of the two weights for each security both funds hold.

Cite this pageCitation, APA and Markdown

ETFIQ, MBB against VMBS, data as of Oct 9, 2026. https://etfiq.com/compare/any/mbb-vs-vmbs

Open data

Free to use with attribution for figures ETFIQ computes; issuer data stays under its owner's terms.