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

In the year to Oct 28, 2026, with distributions reinvested, IWC returned +16.5% and MBB −0.8%.

Which is cheaper, IWC or MBB?

MBB is cheaper, by 0.56 percentage points a year. That is about $56 on $10,000 held for a year. Fees come from each fund's prospectus.

Data as of Oct 28, 2026.

Across categories

IWC vs MBB: Differences, Returns & Fees

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Over the year to Oct 28, 2026, IWC returned +16.5% to MBB's −0.8%; 0% of their weight is in the same names.

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Net assets: $1.2bn on Oct 27, 2026 for iShares Micro-Cap ETF, and $35.5bn on Oct 28, 2026 for iShares MBS ETF.

IWC on its own →MBB on its own →

At a glance

+16.5%

IWC total return, 1 year

−0.8%

MBB total return, 1 year

0.60%

IWC expense ratio

0.04%

MBB expense ratio

Pair scorecard

MBB costs 0.56 points a year less; their one-year returns differ by 17.3 points; MBB is far larger, $35.6bn against $1.2bn.

IWC vs MBB: Differences, Returns & Fees
Measure	IWC	MBB
Return
Measure	IWC	MBB
Total return, 1 year	+16.5%	−0.8%
Drawdown
Measure	IWC	MBB
Below its high	9.5%, high on Aug 14, 2026
Benchmark
Measure	IWC	MBB
What it tracks	Russell Microcap Index	Bloomberg U.S. MBS Index
Cost and size
Measure	IWC	MBB
Expense ratio	0.60%	0.04%
Net assets, as of Oct 26, 2026	$1.2bn	$35.6bn
Holdings
Measure	IWC	MBB
Holdings in common	0%
In the S&P 500, by weight	92%
Top ten holdings, share of the fund	5.9%

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

What they share

By the books each fund has filed, IWC 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 IWC MBB

Only in one fund ↓

Only in IWC

CAREDX 0.88%

PENGUIN SOLUTIONS INC 0.73%

NURIX THERAPEUTICS 0.63%

SELLAS LIFE SCIENCES GROUP INC 0.60%

VIRIDIAN THERAPEUTICS ORS 0.59%

OUSTER 0.53%

INTERFACE 0.52%

STRIVE INC CLASS A 0.50%

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

IWC iShares Micro-Cap ETF MBB iShares MBS ETF

Where it sits Stock ETF Bond ETF

Issuer iShares iShares

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

Total return, 1 year +16.5% −0.8%

Its benchmark over the same days +13.3% (IWV) −1.1% (SPMB)

Gap to its benchmark +3.2 pts vs IWV +0.3 pts vs SPMB

Expense ratio 0.60% 0.04%

Holdings 1365 10813

Net assets, IWC as of Oct 27, 2026 and MBB as of Oct 28, 2026 $1.2bn $35.5bn

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

Alert

About each fund

IWC

Over the year to Oct 28, 2026 it returned +16.5% with distributions reinvested, against +13.3% for its benchmark, the Russell 3000 Index.

IWC tracks the Russell Microcap. The prospectus expense ratio is 0.60% a year. By its holdings published by its issuer for Oct 27, 2026, 92% of the fund by weight is stocks the S&P 500 also holds, across 1,365 positions, with the top ten at 5.9%. It sat 9.5% below its high of Aug 14, 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, IWC or MBB?: In the year to Oct 28, 2026, with distributions reinvested, IWC returned +16.5% and MBB −0.8%.
Which is cheaper, IWC or MBB?: MBB is cheaper, by 0.56 percentage points a year. That is about $56 on $10,000 held for a year. Fees come from each fund's prospectus.

Other comparisons

IWC vs TLT IWC vs VTIP IWC vs PULS IWC vs USFR MBB vs VTWO IWM vs MBB MBB vs VB IJR vs MBB

Where to next

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

Sources and dates

IWC and MBB filings on SEC EDGAR ↗

IWC prospectus with the expense ratio (SEC) ↗

iShares page for IWC ↗

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

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