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

In the year to Sep 13, 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 13, 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
BLACKROCK CASH CL INST SL AGENCY 7.26%	United States Treasury Bill 4.24%
GNMA2 SF 30YR 0.09%	United States Treasury Note/Bond 0.68%
GNMA II 30YR SF - JUMBO-CONFORMING 0.08%	PNC Financial Services Group Inc/The 0.59%
GNMA2 SINGLE FAMILY 30YR 0.04%	United States Treasury Note/Bond 0.53%
GNMA II 30YR 0.03%	Regions Bank/Birmingham AL 0.52%
GNMA2 30YR TBA(REG C) 0.03%	US Bancorp 0.51%
UMBS 15YR TBA(REG B) 0.03%	Charles Schwab Corp/The 0.50%
FNMA 30YR UMBS MEGA REMIC SUPER 0.02%	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 Sep 10, 2026.

MBB and VUSB on the fields both publish, as of Sep 13, 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	2599	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 13, 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.

Other comparisons

Where to next

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 13, 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 13, 2026. https://etfiq.com/compare/any/mbb-vs-vusb Free to use with attribution; the underlying files are at Open data.

A comparison is not a recommendation. Standards and sources