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

In the year to Sep 13, 2026, with distributions reinvested, IWO returned +17.0% and MBB returned −0.1%, so IWO returned more. One year is one year; the longer windows are in the table.

Which is cheaper, IWO or MBB?

IWO charges 0.24% a year and MBB charges 0.04%, 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

IWO vs MBB: how they differ

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

iShares Russell 2000 Growth ETF and iShares MBS ETF.

What they hold in common

By the books each fund has filed, IWO and MBB 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 IWO	Only in MBB
MOOG INC CLASS A 0.69%	BLACKROCK CASH CL INST SL AGENCY 7.26%
GLAUKOS 0.65%	GNMA2 SF 30YR 0.09%
JFROG 0.64%	GNMA II 30YR SF - JUMBO-CONFORMING 0.08%
BRIGHTSPRING HEALTH SERVICES INC 0.62%	GNMA2 SINGLE FAMILY 30YR 0.04%
FIRSTCASH HOLDINGS INC 0.62%	GNMA II 30YR 0.03%
BRINKER INTERNATIONAL INC 0.61%	GNMA2 30YR TBA(REG C) 0.03%
INTERDIGITAL INC 0.60%	UMBS 15YR TBA(REG B) 0.03%
KRYSTAL BIOTECH 0.59%	FNMA 30YR UMBS MEGA REMIC SUPER 0.02%

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.

IWO and MBB on the fields both publish, as of Sep 13, 2026. Source: ETFIQ.
	IWO iShares Russell 2000 Growth ETF	MBB iShares MBS ETF
Where it sits	Core index fund	Core index fund
Issuer	iShares	iShares
What it is	Russell 2000 Growth	Mbs
Total return, 1 year	+17.0%	−0.1%
S&P 500 over the same days	+17.5%	+17.5%
Gap to the S&P 500	−0.5 pts	−17.6 pts
Expense ratio	0.24%	0.04%
Holdings	970	2599

IWO in plain words

IWO is an index equity fund tracking the Russell 2000 Growth. Over the year to Sep 11, 2026 it returned +17.0% with distributions reinvested, against +17.5% for the S&P 500 and +23.0% for the Nasdaq-100. The prospectus expense ratio is 0.24% a year. By its holdings filed for Sep 10, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 970 positions, with the top ten at 6.2%. It sat 7.1% below its high of Aug 14, 2026 on Sep 11, 2026.

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.

Questions people ask

Which returned more over the last year, IWO or MBB?: In the year to Sep 13, 2026, with distributions reinvested, IWO returned +17.0% and MBB returned −0.1%, so IWO returned more. One year is one year; the longer windows are in the table.
Which is cheaper, IWO or MBB?: IWO charges 0.24% a year and MBB charges 0.04%, 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.

IWO against MBB, 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, IWO against MBB, data as of Sep 13, 2026. https://etfiq.com/compare/any/iwo-vs-mbb Free to use with attribution; the underlying files are at Open data.

A comparison is not a recommendation. Standards and sources