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IWB vs OEF: Differences, Returns & Fees

IWB and OEF hold 69% of their weight in the same names. Net assets on Oct 9, 2026: $49.6bn for iShares Russell 1000 ETF and $20.8bn for iShares S&P 100 ETF.

IWB costs 0.05 points a year less; their one-year returns differ by 0.2 points; IWB is 2.4 times larger.

IWB vs OEF: Differences, Returns & Fees
IWBOEF
Expense ratio0.15%0.20%
Net assets$49.6bn$20.8bn
Total return, 1 year+16.6%+16.8%
What it tracksRussell 1000 IndexS&P 100
Holdings in common69%
Top ten holdings, share of the fund36.1%52.6%

Holdings in common uses holdings dated Oct 9, 2026.

+16.6%
IWB total return, 1 year
+16.8%
OEF total return, 1 year
0.15%
IWB expense ratio
0.20%
OEF expense ratio

What they hold in common

By the books each fund has filed, IWB and OEF hold 69% 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

69% in common

Positions both hold, largest shared weight first
Holding IWB OEF
NVIDIA 7.44% 11.11%
APPLE 6.77% 9.84%
MICROSOFT 5.53% 7.96%
AMAZON.COM INC 3.54% 5.16%
ALPHABET CLASS A 2.85% 4.13%
BROADCOM INC 2.34% 3.45%
ALPHABET CLASS C 2.30% 3.31%
META PLATFORMS CLASS A 2.20% 3.17%
MICRON TECHNOLOGY 1.61% 2.33%
TESLA INC 1.56% 2.16%
ADVANCED MICRO DEVICES 1.38% 1.99%
BERKSHIRE HATHAWAY INC CLASS B 1.34% 1.92%
Only in IWB
CROWDSTRIKE HOLDINGS CLASS A 0.38%
KLA 0.36%
MARVELL TECHNOLOGY 0.33%
AMPHENOL CORP CLASS A 0.30%
ANALOG DEVICES 0.28%
EATON PLC 0.23%
WELLTOWER 0.23%
TJX 0.21%
Only in OEF

Check overlap with more funds →

On the same fields

IWB
iShares Russell 1000 ETF
OEF
iShares S&P 100 ETF
Where it sits Stock ETF Stock ETF
Issuer iShares iShares
What it is Tracks the Russell 1000 Tracks an index
Total return, 1 year +16.6% +16.8%
Its benchmark over the same days +16.8% (VONE) not published
Gap to its benchmark −0.1 pts vs VONE not available
Expense ratio 0.15% 0.20%
Already in the S&P 500 91.7% 99.9%
Holdings 1025 102
Net assets $49.6bn $20.8bn

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

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%.

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, IWB or OEF?
In the year to Oct 9, 2026, with distributions reinvested, IWB returned +16.6% and OEF +16.8%.
Which is cheaper, IWB or OEF?
IWB is cheaper, by 0.05 percentage points a year. That is about $5 on $10,000 held for a year. Fees come from each fund's prospectus.
How much do IWB and OEF overlap with the S&P 500?
By their latest filed holdings, 92% of IWB and 100% of OEF by weight is stocks the S&P 500 already holds.
Other comparisons
IWB vs MTUMIWB vs USMVIWB vs RDVYAVUS vs IWBOEF vs QUALOEF vs SCHBOEF vs RDVYOEF vs USMV
IWB on its own →OEF on its own →Hold both: look the portfolio through →Rankings →Standards and sources →
Where these figures came from
IWB and OEF filings on SEC EDGAR ↗IWB and OEF prospectus with the expense ratio (SEC) ↗iShares page for IWB ↗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, IWB against OEF, data as of Oct 9, 2026. https://etfiq.com/compare/any/iwb-vs-oef

Open data

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