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Data as of Oct 28, 2026.

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MBB vs VUSB: Differences, Returns & Fees

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MBB's duration was 5.7 years on Aug 31, 2026 and VUSB's 1.0 on Jun 30, 2026; MBB charges 0.04% to VUSB's 0.10%.

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Net assets: $35.5bn on Oct 28, 2026 for iShares MBS ETF, and $9.9bn on Sep 30, 2026 for Vanguard Ultra-Short Bond ETF.

MBB on its own →VUSB on its own →
At a glance
−0.8%
MBB total return, 1 year
+3.5%
VUSB total return, 1 year
0.04%
MBB expense ratio
0.10%
VUSB expense ratio

Pair scorecard

MBB costs 0.06 points a year less; their one-year returns differ by 4.3 points; MBB is 3.7 times larger.

MBB vs VUSB: Differences, Returns & Fees
MeasureMBBVUSB
Return
Total return, 1 year−0.8%+3.5%
Benchmark
What it tracksBloomberg U.S. MBS IndexNo index, actively managed
Cost and size
Expense ratio0.04%0.10%
Net assets, as of Sep 30, 2026$36.2bn$9.9bn
Holdings
Holdings in common0%

Holdings in common uses holdings dated Jun 30, 2026 and Aug 31, 2026. Method

What they share

0%

By the books each fund has filed, MBB and VUSB hold 0% of their money in the same securities at the same weight. Holdings dated Jun 30, 2026 and Aug 31, 2026.

0 half 100%

half

0% in common

Positions both hold · largest shared weight first MBB VUSB
Only in one fund ↓
Only in MBB
Ginnie Mae, due Sep 1, 2056 1.05%
Freddie Mac Pool, due May 1, 2051 0.98%
Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 0.85%
Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 0.70%
Ginnie Mae, due Sep 1, 2056 0.53%
Ginnie Mae II Pool, due Nov 20, 2054 0.51%
Ginnie Mae II Pool, due Oct 20, 2051 0.51%
Ginnie Mae II Pool, due Dec 20, 2051 0.50%
Only in VUSB
TREASURY BILL, due Jun 10, 2027 4.19%
US TREASURY N/B, due Jul 31, 2027 0.67%
PNC FINANCIAL, due Oct 26, 2029 0.58%
US TREASURY N/B, due Jun 30, 2028 0.52%
REGIONS BANKS, due Jul 27, 2029 0.51%
US BANCORP, due Jun 12, 2029 0.50%
CHARLES SCHWAB, due Jul 27, 2029 0.49%
TRUIST BANK, due Jul 24, 2028 0.44%
Check overlap with more funds →

Side by side

MBB iShares MBS ETF VUSB Vanguard Ultra-Short Bond ETF
Where it sits Bond ETF Bond ETF
Issuer iShares Vanguard
What it is Tracks an index of mortgage-backed securities Actively managed
Total return, 1 year −0.8% +3.5%
Its benchmark over the same days −1.1% (SPMB) −1.4% (AGG)
Gap to its benchmark +0.3 pts vs SPMB +4.9 pts vs AGG
Expense ratio 0.04% 0.10%
Holdings 10813 1344
Net assets, MBB as of Oct 28, 2026 and VUSB as of Sep 30, 2026 $35.5bn $9.9bn

MBB and VUSB on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.

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About each fund
MBB

MBB tracks an index of mortgage-backed securities. Over the year to Oct 28, 2026 it returned −0.8% with distributions reinvested, against −1.1% for its benchmark, the Bloomberg U.S. MBS Index. The prospectus expense ratio is 0.04% a year.

VUSB

VUSB is actively managed and tracks no index. Over the year to Oct 28, 2026 it returned +3.5% with distributions reinvested, against −1.4% for its benchmark, the Bloomberg U.S. Aggregate Bond Index. The prospectus expense ratio is 0.10% a year.

Questions people ask

Which returned more over the last year, MBB or VUSB?
In the year to Oct 28, 2026, with distributions reinvested, MBB returned −0.8% and VUSB +3.5%.
Which is cheaper, MBB or VUSB?
MBB is cheaper, by 0.06 percentage points a year. That is about $6 on $10,000 held for a year. Fees come from each fund's prospectus.
Other comparisons
MBB vs VBILMBB vs USFRMBB vs PULSMBB vs SHVVGIT vs VUSBVTIP vs VUSBSCHP vs VUSBTIP vs VUSB
Where to next
MBB on its own →VUSB on its own →Hold both: look the portfolio through →Rankings →MBB dividend history →MBB holdings →VUSB dividend history →VUSB holdings →Standards and sources →
Sources and dates
MBB filings on SEC EDGAR ↗
MBB prospectus with the expense ratio (SEC) ↗
iShares page for MBB ↗
VUSB filings on SEC EDGAR ↗
VUSB prospectus with the expense ratio (SEC) ↗
Vanguard page for VUSB ↗

Links are sources, not endorsements. 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.

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ETFIQ, MBB against VUSB, data as of Oct 28, 2026. https://etfiq.com/compare/any/mbb-vs-vusb

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