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

In the year to Oct 28, 2026, with distributions reinvested, IEI returned −1.1% and MBB −0.8%.

Which is cheaper, IEI or MBB?

MBB is cheaper, by 0.11 percentage points a year. That is about $11 on $10,000 held for a year. Fees come from each fund's prospectus.

Data as of Oct 28, 2026.

Across categories

IEI vs MBB: Differences, Returns & Fees

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On Aug 31, 2026 IEI's duration was 4.3 years and MBB's 5.7; MBB charges 0.04% to IEI's 0.15%.

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Net assets: $17.0bn on Oct 27, 2026 for iShares 3-7 Year Treasury Bond ETF, and $35.5bn on Oct 28, 2026 for iShares MBS ETF.

IEI on its own →MBB on its own →

At a glance

−1.1%

IEI total return, 1 year

−0.8%

MBB total return, 1 year

0.15%

IEI expense ratio

0.04%

MBB expense ratio

Pair scorecard

MBB costs 0.11 points a year less; their one-year returns differ by 0.3 points; MBB is 2.1 times larger.

IEI vs MBB: Differences, Returns & Fees
Measure	IEI	MBB
Return
Measure	IEI	MBB
Total return, 1 year	−1.1%	−0.8%
Benchmark
Measure	IEI	MBB
What it tracks	ICE U.S. Treasury 3-7 Year Bond Index	Bloomberg U.S. MBS Index
Cost and size
Measure	IEI	MBB
Expense ratio	0.15%	0.04%
Net assets, as of Oct 26, 2026	$17.0bn	$35.6bn
Holdings
Measure	IEI	MBB
Holdings in common	0%

Holdings in common uses holdings dated Aug 31, 2026. Method

What they share

By the books each fund has filed, IEI and MBB hold 0% of their money in the same securities at the same weight. Holdings dated Aug 31, 2026.

50%

0 half 100%

half

0% in common

Positions both hold · largest shared weight first IEI MBB

Only in one fund ↓

Only in IEI

U.S. Treasury Notes, due Nov 30, 2030 2.90%

U.S. Treasury Notes, due Feb 15, 2032 2.30%

U.S. Treasury Notes, due Feb 28, 2030 2.29%

U.S. Treasury Notes, due Nov 15, 2031 2.26%

U.S. Treasury Notes, due Aug 31, 2030 2.24%

U.S. Treasury Notes, due May 15, 2033 2.17%

U.S. Treasury Notes, due Aug 15, 2031 2.11%

U.S. Treasury Notes, due Feb 15, 2033 2.10%

Only in MBB

Ginnie Mae, due Sep 1, 2056 1.05%

Freddie Mac Pool, due May 1, 2051 0.98%

Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 0.85%

Uniform Mortgage-Backed Security, TBA, due Sep 1, 2056 0.70%

Ginnie Mae, due Sep 1, 2056 0.53%

Ginnie Mae II Pool, due Nov 20, 2054 0.51%

Ginnie Mae II Pool, due Oct 20, 2051 0.51%

Ginnie Mae II Pool, due Dec 20, 2051 0.50%

Check overlap with more funds →

Side by side

IEI iShares 3-7 Year Treasury Bond ETF MBB iShares MBS ETF

Where it sits Bond ETF Bond ETF

Issuer iShares iShares

What it is Tracks an index of 3-7 Year Treasury Bond Tracks an index of mortgage-backed securities

Total return, 1 year −1.1% −0.8%

Its benchmark over the same days not measured −1.1% (SPMB)

Gap to its benchmark not measured +0.3 pts vs SPMB

Expense ratio 0.15% 0.04%

Holdings 82 10813

Net assets, IEI as of Oct 27, 2026 and MBB as of Oct 28, 2026 $17.0bn $35.5bn

IEI and MBB on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.

Alert

About each fund

IEI

IEI tracks an index of 3-7 Year Treasury Bond. Over the year to Oct 28, 2026 it returned −1.1% with distributions reinvested. The prospectus expense ratio is 0.15% a year.

MBB

MBB tracks an index of mortgage-backed securities. Over the year to Oct 28, 2026 it returned −0.8% with distributions reinvested, against −1.1% for its benchmark, the Bloomberg U.S. MBS Index. The prospectus expense ratio is 0.04% a year.

Questions people ask

Which returned more over the last year, IEI or MBB?: In the year to Oct 28, 2026, with distributions reinvested, IEI returned −1.1% and MBB −0.8%.
Which is cheaper, IEI or MBB?: MBB is cheaper, by 0.11 percentage points a year. That is about $11 on $10,000 held for a year. Fees come from each fund's prospectus.

Other comparisons

IEI vs TLT IEI vs IUSB IEI vs SHV IEI vs VTIP MBB vs SHY MBB vs VGSH MBB vs VMBS LQD vs MBB

Where to next

IEI on its own →MBB on its own →Hold both: look the portfolio through →Rankings →IEI dividend history →IEI holdings →MBB dividend history →MBB holdings →Standards and sources →

Sources and dates

IEI and MBB filings on SEC EDGAR ↗

IEI and MBB prospectus with the expense ratio (SEC) ↗

iShares page for IEI ↗

iShares page for MBB ↗

Links are sources, not endorsements. A comparison is not a recommendation.

How this is computed

Overlap adds up the smaller of the two weights for each security both funds hold.

Cite this pageCitation, APA and Markdown

ETFIQ, IEI against MBB, data as of Oct 28, 2026. https://etfiq.com/compare/any/iei-vs-mbb

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Free to use with attribution for data ETFIQ computes; issuer data stays under its owner's terms.