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

In the year to Oct 28, 2026, with distributions reinvested, IWF returned +0.9% and MBB −0.8%.

Which is cheaper, IWF or MBB?

MBB is cheaper, by 0.14 percentage points a year. That is about $14 on $10,000 held for a year. Fees come from each fund's prospectus.

Data as of Oct 28, 2026.

Across categories

IWF vs MBB: Differences, Returns & Fees

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Over the year to Oct 28, 2026, IWF returned +0.9% to MBB's −0.8%; 0% of their weight is in the same names.

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Net assets: $124.7bn on Oct 27, 2026 for iShares Russell 1000 Growth ETF, and $35.5bn on Oct 28, 2026 for iShares MBS ETF.

IWF on its own →MBB on its own →

At a glance

+0.9%

IWF total return, 1 year

−0.8%

MBB total return, 1 year

0.18%

IWF expense ratio

0.04%

MBB expense ratio

Pair scorecard

MBB costs 0.14 points a year less; their one-year returns differ by 1.7 points; IWF is 3.5 times larger.

IWF vs MBB: Differences, Returns & Fees
Measure	IWF	MBB
Return
Measure	IWF	MBB
Total return, 1 year	+0.9%	−0.8%
Drawdown
Measure	IWF	MBB
Below its high	4.8%, high on Oct 6, 2026
Benchmark
Measure	IWF	MBB
What it tracks	Russell 1000 Growth Index	Bloomberg U.S. MBS Index
Cost and size
Measure	IWF	MBB
Expense ratio	0.18%	0.04%
Net assets, as of Oct 26, 2026	$123.5bn	$35.6bn
Holdings
Measure	IWF	MBB
Holdings in common	0%
In the S&P 500, by weight	94%
Top ten holdings, share of the fund	57.5%

Holdings in common uses holdings dated Oct 27, 2026. Method

What they share

By the books each fund has filed, IWF and MBB hold 0% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.

50%

0 half 100%

half

0% in common

Positions both hold · largest shared weight first IWF MBB

Only in one fund ↓

Only in IWF

NVIDIA 15.30%

APPLE 8.18%

MICROSOFT 5.94%

ALPHABET CLASS A 5.62%

BROADCOM INC 4.79%

ALPHABET CLASS C 4.53%

TESLA INC 3.58%

META PLATFORMS CLASS A 3.36%

Only in MBB

BLACKROCK CASH CL INST SL AGENCY 5.45%

FHLMC 30YR UMBS SUPER 1.05%

UMBS 30YR TBA(REG A) 0.60%

GNMA2 30YR 0.59%

GNMA2 30YR 0.54%

FNMA 30YR UMBS 0.53%

GNMA2 30YR 0.53%

GNMA2 30YR 0.52%

Check overlap with more funds →

Side by side

IWF iShares Russell 1000 Growth ETF MBB iShares MBS ETF

Where it sits Stock ETF Bond ETF

Issuer iShares iShares

What it is Tracks the Russell 1000 growth Tracks an index of mortgage-backed securities

Total return, 1 year +0.9% −0.8%

Its benchmark over the same days +1.1% (VONG) −1.1% (SPMB)

Gap to its benchmark −0.2 pts vs VONG +0.3 pts vs SPMB

Expense ratio 0.18% 0.04%

Holdings 374 10813

Net assets, IWF as of Oct 27, 2026 and MBB as of Oct 28, 2026 $124.7bn $35.5bn

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

Alert

About each fund

IWF

IWF tracks the Russell 1000 growth. Over the year to Oct 28, 2026 it returned +0.9% with distributions reinvested, against +1.1% for its benchmark, the Russell 1000 Growth Index. The prospectus expense ratio is 0.18% a year. By its holdings published by its issuer for Oct 27, 2026, 94% of the fund by weight is stocks the S&P 500 also holds, across 374 positions, with the top ten at 57.5%. It sat 4.8% below its high of Oct 6, 2026 on Oct 28, 2026.

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, IWF or MBB?: In the year to Oct 28, 2026, with distributions reinvested, IWF returned +0.9% and MBB −0.8%.
Which is cheaper, IWF or MBB?: MBB is cheaper, by 0.14 percentage points a year. That is about $14 on $10,000 held for a year. Fees come from each fund's prospectus.

Other comparisons

IWF vs TLT IWF vs VTIP IWF vs PULS IWF vs USFR MBB vs QQQM MBB vs VUG MBB vs QQQ MBB vs SCHG

Where to next

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

Sources and dates

IWF and MBB filings on SEC EDGAR ↗

IWF prospectus with the expense ratio (SEC) ↗

iShares page for IWF ↗

MBB prospectus with the expense ratio (SEC) ↗

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

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