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IOO vs IWB: Differences, Returns & Fees

IOO and IWB hold 47% of their weight in the same names, and IOO returned +21.1% over the year. Net assets on Oct 9, 2026: $9.4bn for iShares Global 100 ETF and $49.6bn for iShares Russell 1000 ETF.

IWB costs 0.25 points a year less; their one-year returns differ by 4.5 points; IWB is 5.3 times larger.

IOO vs IWB: Differences, Returns & Fees
IOOIWB
Expense ratio0.40%0.15%
Net assets$9.4bn$49.6bn
Total return, 1 year+21.1%+16.6%
What it tracksS&P Global 100Russell 1000 Index
Holdings in common47%
Top ten holdings, share of the fund59.9%36.1%

Holdings in common uses holdings dated Oct 9, 2026.

+21.1%
IOO total return, 1 year
+16.6%
IWB total return, 1 year
0.40%
IOO expense ratio
0.15%
IWB expense ratio

What they hold in common

By the books each fund has filed, IOO and IWB hold 47% of their money in the same securities at the same weight. Above 50%, holding both is close to holding one of them twice. Holdings dated Oct 9, 2026.

half

47% in common

Positions both hold, largest shared weight first
Holding IOO IWB
NVIDIA 13.21% 7.44%
APPLE 11.70% 6.77%
MICROSOFT 9.46% 5.53%
AMAZON.COM INC 6.13% 3.54%
ALPHABET CLASS A 4.91% 2.85%
BROADCOM INC 4.10% 2.34%
ALPHABET CLASS C 3.94% 2.30%
ELI LILLY 2.25% 1.31%
JPMORGAN CHASE & CO 2.11% 1.24%
EXXONMOBIL HOLDINGS CORP 1.65% 0.97%
JOHNSON & JOHNSON 1.50% 0.88%
WALMART 1.18% 0.68%
Only in IOO
SAMSUNG ELECTRONICS LTD 2.12%
ASML HOLDING 1.65%
TENCENT HOLDINGS 0.80%
HSBC HOLDINGS PLC 0.75%
SHELL 0.69%
MITSUBISHI UFJ FINANCIAL GROUP 0.62%
NOVARTIS AG 0.62%
ASTRAZENECA PLC 0.58%
Only in IWB
META PLATFORMS CLASS A 2.20%
MICRON TECHNOLOGY 1.61%
TESLA INC 1.56%
ADVANCED MICRO DEVICES 1.38%
BERKSHIRE HATHAWAY INC CLASS B 1.34%
VISA CLASS A 0.91%
ABBVIE 0.68%
PALANTIR TECHNOLOGIES CLASS A 0.65%

Check overlap with more funds →

On the same fields

IOO
iShares Global 100 ETF
IWB
iShares Russell 1000 ETF
Where it sits Stock ETF Stock ETF
Issuer iShares iShares
What it is Tracks an index Tracks the Russell 1000
Total return, 1 year +21.1% +16.6%
Its benchmark over the same days not published +16.8% (VONE)
Gap to its benchmark not available −0.1 pts vs VONE
Expense ratio 0.40% 0.15%
Already in the S&P 500 79.0% 91.7%
Holdings 104 1025
Net assets $9.4bn $49.6bn

IOO and IWB on the fields both publish, as of Oct 9, 2026. Source: ETFIQ.

About IOO

IOO tracks an index. Over the year to Oct 9, 2026 it returned +21.1% with distributions reinvested. The prospectus expense ratio is 0.40% a year. By its holdings published by its issuer for Oct 9, 2026, 79% of the fund by weight is stocks the S&P 500 also holds, across 104 positions, with the top ten at 59.9%.

About IWB

IWB tracks the Russell 1000. Over the year to Oct 9, 2026 it returned +16.6% with distributions reinvested, against +16.8% for its benchmark, the Russell 1000 Index. The prospectus expense ratio is 0.15% a year. By its holdings published by its issuer for Oct 9, 2026, 92% of the fund by weight is stocks the S&P 500 also holds, across 1,025 positions, with the top ten at 36.1%.

Questions people ask

Which returned more over the last year, IOO or IWB?
In the year to Oct 9, 2026, with distributions reinvested, IOO returned +21.1% and IWB +16.6%.
Which is cheaper, IOO or IWB?
IWB is cheaper, by 0.25 percentage points a year. That is about $25 on $10,000 held for a year. Fees come from each fund's prospectus.
How much do IOO and IWB overlap with the S&P 500?
By their latest filed holdings, 79% of IOO and 92% of IWB by weight is stocks the S&P 500 already holds.
Other comparisons
IOO vs QUALIOO vs SCHBIOO vs RDVYIOO vs USMVIWB vs QUALIWB vs SCHXITOT vs IWBIWB vs VIG
IOO on its own →IWB on its own →Hold both: look the portfolio through →Rankings →Standards and sources →
Where these figures came from
IOO and IWB filings on SEC EDGAR ↗IOO and IWB prospectus with the expense ratio (SEC) ↗iShares page for IOO ↗iShares page for IWB ↗

ETFIQ links to the documents behind every figure; a link is not an endorsement. 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, IOO against IWB, data as of Oct 9, 2026. https://etfiq.com/compare/any/ioo-vs-iwb

Open data

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