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

In the year to Sep 21, 2026, with distributions reinvested, IBIT returned −31.1% and MBB returned +0.3%, so MBB returned more.

Which is cheaper, IBIT or MBB?

IBIT charges 0.25% a year and MBB charges 0.04%, so MBB is cheaper. Fees come from each fund's prospectus.

Data as of Sep 21, 2026.

ETFIQetfiq.com · independent ETF data

IBIT vs MBB: how they differ

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

iShares Bitcoin Trust ETF and iShares MBS ETF.

What they hold in common

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

Positions IBIT and MBB both hold, largest shared weight first
Holding	IBIT	MBB
USD CASH	0.00%	-5.48%

Only in each
Only in IBIT	Only in MBB
BITCOIN 100.00%	BLACKROCK CASH CL INST SL AGENCY 6.95%
	FHLMC 30YR UMBS SUPER 1.02%
	GNMA2 30YR TBA(REG C) 0.74%
	GNMA2 30YR TBA(REG C) 0.66%
	UMBS 30YR TBA(REG A) 0.66%
	UMBS 30YR TBA(REG A) 0.60%
	GNMA2 30YR 0.58%
	GNMA2 30YR TBA(REG C) 0.57%

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 18, 2026.

IBIT and MBB on the fields both publish, as of Sep 21, 2026. Source: ETFIQ.
	IBIT iShares Bitcoin Trust ETF	MBB iShares MBS ETF
Where it sits	Core fund	Core fund
Issuer	iShares	iShares
What it is	Holds bitcoin	Tracks an index of MBS
Total return, 1 year	−31.1%	+0.3%
S&P 500 over the same days	+16.6%	+16.6%
Gap to the S&P 500	−47.6 pts	−16.3 pts
Expense ratio	0.25%	0.04%
Holdings	2	11214
Net assets	$63.7bn	$38.9bn

IBIT in plain words

IBIT holds bitcoin. Over the year to Sep 18, 2026 it returned −31.1% with distributions reinvested, against +16.6% for the S&P 500 and +21.8% for the Nasdaq-100. The prospectus expense ratio is 0.25% a year. It sat 35.5% below its high of Oct 6, 2025 on Sep 18, 2026.

MBB in plain words

MBB tracks an index of MBS. Over the year to Sep 18, 2026 it returned +0.3% with distributions reinvested, against +16.6% for the S&P 500 and +21.8% for the Nasdaq-100. The prospectus expense ratio is 0.04% a year. It sat 3.4% below its high of Feb 27, 2026 on Sep 18, 2026.

Questions people ask

Which returned more over the last year, IBIT or MBB?: In the year to Sep 21, 2026, with distributions reinvested, IBIT returned −31.1% and MBB returned +0.3%, so MBB returned more.
Which is cheaper, IBIT or MBB?: IBIT charges 0.25% 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.

IBIT against MBB, ETFIQ, data as of Sep 21, 2026. Every figure is calculated from a named public source; the method is at etfiq.com/methodology. A comparison is not a recommendation.

Cite this page. ETFIQ, IBIT against MBB, data as of Sep 21, 2026. https://etfiq.com/compare/any/ibit-vs-mbb Free to use with attribution; the underlying files are at Open data.

A comparison is not a recommendation. Standards and sources