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

In the year to Sep 13, 2026, with distributions reinvested, MBB returned −0.1% and MUB returned +0.1%, so MUB returned more. One year is one year; the longer windows are in the table.

Which is cheaper, MBB or MUB?

MBB charges 0.04% a year and MUB charges 0.05%, 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 MUB: how they differ

MBB and MUB hold 0% of their weight in the same names.

iShares MBS ETF and iShares National Muni Bond ETF.

What they hold in common

By the books each fund has filed, MBB and MUB 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 MUB
BLACKROCK CASH CL INST SL AGENCY 7.26%	HOUSTON TEX HIGHER ED FIN CORP 0.13%
GNMA2 SF 30YR 0.09%	DISTRICT COLUMBIA UNIV REV 0.10%
GNMA II 30YR SF - JUMBO-CONFORMING 0.08%	ECTOR CNTY TEX 0.08%
GNMA2 SINGLE FAMILY 30YR 0.04%	NEW ORLEANS LA 0.08%
GNMA II 30YR 0.03%	PORT TACOMA WASH REV 0.08%
GNMA2 30YR TBA(REG C) 0.03%	CONTRA COSTA CALIF CMNTY COLLE 0.06%
UMBS 15YR TBA(REG B) 0.03%	LOS ANGELES CALIF 0.06%
FNMA 30YR UMBS MEGA REMIC SUPER 0.02%	LOS ANGELES CNTY CALIF 0.06%

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 Sep 10, 2026.

MBB and MUB on the fields both publish, as of Sep 13, 2026. Source: ETFIQ.
	MBB iShares MBS ETF	MUB iShares National Muni Bond ETF
Where it sits	Core index fund	Core index fund
Issuer	iShares	iShares
What it is	Mbs	National Muni Bond
Total return, 1 year	−0.1%	+0.1%
S&P 500 over the same days	+17.5%	+17.5%
Gap to the S&P 500	−17.6 pts	−17.4 pts
Expense ratio	0.04%	0.05%
Holdings	2599	5215

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.

MUB in plain words

MUB is a bond fund tracking the National Muni Bond. 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 0.05% a year. It sat 3.6% below its high of Jul 6, 2026 on Sep 11, 2026.

Questions people ask

Which returned more over the last year, MBB or MUB?: In the year to Sep 13, 2026, with distributions reinvested, MBB returned −0.1% and MUB returned +0.1%, so MUB returned more. One year is one year; the longer windows are in the table.
Which is cheaper, MBB or MUB?: MBB charges 0.04% a year and MUB charges 0.05%, 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 MUB, 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 MUB, data as of Sep 13, 2026. https://etfiq.com/compare/any/mbb-vs-mub Free to use with attribution; the underlying files are at Open data.

A comparison is not a recommendation. Standards and sources