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

In the year to Sep 12, 2026, with distributions reinvested, MBB returned −0.1% and VUSB returned +3.7%, so VUSB returned more. One year is one year; the longer windows are in the table.

Which is cheaper, MBB or VUSB?

MBB charges 0.04% a year and VUSB charges 0.10%, so MBB is cheaper. Fees come from each fund's prospectus.

Data as of Sep 12, 2026. Both funds on the fields they both publish, from the same sources.

ETFIQetfiq.com · independent ETF data

MBB vs VUSB: how they differ

MBB and VUSB hold 0% of their weight in the same names, and VUSB returned more over the year.

iShares MBS ETF and Vanguard Ultra-Short Bond ETF.

What they hold in common

By the books each fund has filed, MBB and VUSB hold 0% of their money in the same securities at the same weight.

Largest positions each one holds and the other does not
Only in MBB	Only in VUSB
Freddie Mac 1.07%	United States Treasury Bill 4.24%
Government National Mortgage Association 0.97%	United States Treasury Note/Bond 0.68%
UMBS, TBA 0.85%	PNC Financial Services Group Inc/The 0.59%
Government National Mortgage Association 0.69%	United States Treasury Note/Bond 0.53%
UMBS, TBA 0.66%	Regions Bank/Birmingham AL 0.52%
Government National Mortgage Association 0.56%	US Bancorp 0.51%
Government National Mortgage Association 0.55%	Charles Schwab Corp/The 0.50%
Government National Mortgage Association 0.54%	Truist Bank 0.45%

Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed. Above 50%, holding both is close to holding one of them twice. Holdings dated Jun 30, 2026 and May 31, 2026.

MBB and VUSB on the fields both publish, as of Sep 12, 2026. Source: ETFIQ.
	MBB iShares MBS ETF	VUSB Vanguard Ultra-Short Bond ETF
Where it sits	Core index fund	Core index fund
Issuer	iShares	Vanguard
What it is	Mbs	Ultra-Short Bond
Total return, 1 year	−0.1%	+3.7%
S&P 500 over the same days	+17.5%	+17.5%
Gap to the S&P 500	−17.6 pts	−13.8 pts
Expense ratio	0.04%	0.10%
Holdings	11144	1281

MBB in plain words

MBB is a bond fund tracking the Mbs. Over the year to Sep 11, 2026 it returned −0.1% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.04% a year. It sat 3.3% below its high of Feb 27, 2026 on Sep 11, 2026.

VUSB in plain words

VUSB is a cash and treasury bills tracking the Ultra-Short Bond. Over the year to Sep 11, 2026 it returned +3.7% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. 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 Sep 12, 2026, with distributions reinvested, MBB returned −0.1% and VUSB returned +3.7%, so VUSB returned more. One year is one year; the longer windows are in the table.
Which is cheaper, MBB or VUSB?: MBB charges 0.04% a year and VUSB charges 0.10%, so MBB is cheaper. Fees come from each fund's prospectus.

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Where these figures came from

ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement.

MBB against VUSB, ETFIQ, data as of Sep 12, 2026. Every figure is arithmetic on a named public source; the method is at etfiq.com/methodology. A comparison is not a recommendation.

Cite this page. ETFIQ, MBB against VUSB, data as of Sep 12, 2026. https://etfiq.com/compare/any/MBB-VUSB Free to use with attribution; the underlying files are at Open data.

A comparison is not a recommendation. Standards and sources