A
vs
B
Share
Compare their flowsAsk IQ about these two funds

IOO vs OEF: Differences, Returns & Fees

IOO and OEF hold 67% 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 $20.8bn for iShares S&P 100 ETF.

OEF costs 0.20 points a year less; their one-year returns differ by 4.3 points; OEF is 2.2 times larger.

IOO vs OEF: Differences, Returns & Fees
IOOOEF
Expense ratio0.40%0.20%
Net assets$9.4bn$20.8bn
Total return, 1 year+21.1%+16.8%
What it tracksS&P Global 100S&P 100
Holdings in common67%
Top ten holdings, share of the fund59.9%52.6%

Holdings in common uses holdings dated Oct 9, 2026.

+21.1%
IOO total return, 1 year
+16.8%
OEF total return, 1 year
0.40%
IOO expense ratio
0.20%
OEF expense ratio

What they hold in common

By the books each fund has filed, IOO and OEF hold 67% 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

67% in common

Positions both hold, largest shared weight first
Holding IOO OEF
NVIDIA 13.21% 11.11%
APPLE 11.70% 9.84%
MICROSOFT 9.46% 7.96%
AMAZON.COM INC 6.13% 5.16%
ALPHABET CLASS A 4.91% 4.13%
BROADCOM INC 4.10% 3.45%
ALPHABET CLASS C 3.94% 3.31%
ELI LILLY 2.25% 1.89%
JPMORGAN CHASE & CO 2.11% 1.77%
EXXONMOBIL HOLDINGS CORP 1.65% 1.39%
JOHNSON & JOHNSON 1.50% 1.26%
INTEL CORPORATION 1.24% 1.04%
Only in IOO
SAMSUNG ELECTRONICS LTD 2.12%
ASML HOLDING 1.65%
TENCENT HOLDINGS 0.80%
HSBC HOLDINGS PLC 0.75%
ROCHE PS PAR AG 0.72%
SHELL 0.69%
MITSUBISHI UFJ FINANCIAL GROUP 0.62%
NOVARTIS AG 0.62%
Only in OEF
META PLATFORMS CLASS A 3.17%
MICRON TECHNOLOGY 2.33%
TESLA INC 2.16%
ADVANCED MICRO DEVICES 1.99%
BERKSHIRE HATHAWAY INC CLASS B 1.92%
VISA CLASS A 1.32%
ABBVIE 0.98%
PALANTIR TECHNOLOGIES CLASS A 0.96%

Check overlap with more funds →

On the same fields

IOO
iShares Global 100 ETF
OEF
iShares S&P 100 ETF
Where it sits Stock ETF Stock ETF
Issuer iShares iShares
What it is Tracks an index Tracks an index
Total return, 1 year +21.1% +16.8%
Expense ratio 0.40% 0.20%
Already in the S&P 500 79.0% 99.9%
Holdings 104 102
Net assets $9.4bn $20.8bn

IOO and OEF 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 OEF

OEF tracks an index. Over the year to Oct 9, 2026 it returned +16.8% with distributions reinvested. The prospectus expense ratio is 0.20% a year. By its holdings published by its issuer for Oct 9, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 102 positions, with the top ten at 52.6%.

Questions people ask

Which returned more over the last year, IOO or OEF?
In the year to Oct 9, 2026, with distributions reinvested, IOO returned +21.1% and OEF +16.8%.
Which is cheaper, IOO or OEF?
OEF is cheaper, by 0.20 percentage points a year. That is about $20 on $10,000 held for a year. Fees come from each fund's prospectus.
How much do IOO and OEF overlap with the S&P 500?
By their latest filed holdings, 79% of IOO and 100% of OEF by weight is stocks the S&P 500 already holds.
Other comparisons
IOO vs IWVIOO vs MTUMIOO vs SPHQIOO vs SPMOJQUA vs OEFOEF vs TCAFOEF vs VONEMGC vs OEF
IOO on its own →OEF on its own →Hold both: look the portfolio through →Rankings →Standards and sources →
Where these figures came from
IOO and OEF filings on SEC EDGAR ↗IOO and OEF prospectus with the expense ratio (SEC) ↗iShares page for IOO ↗iShares page for OEF ↗

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 OEF, data as of Oct 9, 2026. https://etfiq.com/compare/any/ioo-vs-oef

Open data

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