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IYY vs OEF: Differences, Returns & Fees

IYY and OEF hold 69% of their weight in the same names. Net assets on Oct 9, 2026: $3.1bn for iShares Dow Jones U.S. ETF and $20.8bn for iShares S&P 100 ETF.

Both cost 0.20% a year; both returned +16.8% over a year; OEF is 6.8 times larger.

IYY vs OEF: Differences, Returns & Fees
IYYOEF
Expense ratio0.20%0.20%
Net assets$3.1bn$20.8bn
Total return, 1 year+16.8%+16.8%
What it tracksDow Jones U.S. IndexS&P 100
Holdings in common69%
Top ten holdings, share of the fund36.4%52.6%

Holdings in common uses holdings dated Oct 9, 2026.

+16.8%
IYY total return, 1 year
+16.8%
OEF total return, 1 year
0.20%
IYY expense ratio
0.20%
OEF expense ratio

What they hold in common

By the books each fund has filed, IYY 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 IYY OEF
NVIDIA 7.68% 11.11%
APPLE 6.80% 9.84%
MICROSOFT 5.50% 7.96%
AMAZON.COM INC 3.56% 5.16%
ALPHABET CLASS A 2.86% 4.13%
BROADCOM INC 2.38% 3.45%
ALPHABET CLASS C 2.29% 3.31%
META PLATFORMS CLASS A 2.19% 3.17%
MICRON TECHNOLOGY 1.61% 2.33%
TESLA INC 1.49% 2.16%
ADVANCED MICRO DEVICES 1.37% 1.99%
BERKSHIRE HATHAWAY INC CLASS B 1.33% 1.92%
Only in IYY
CROWDSTRIKE HOLDINGS CLASS A 0.39%
KLA 0.35%
MARVELL TECHNOLOGY 0.33%
SPACE EXPLORATION TECHNOLOGIES COR 0.31%
AMPHENOL CORP CLASS A 0.30%
ANALOG DEVICES 0.27%
SEAGATE TECHNOLOGY HOLDINGS PLC 0.25%
EATON PLC 0.23%
Only in OEF

Check overlap with more funds →

On the same fields

IYY
iShares Dow Jones U.S. 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 +16.8% +16.8%
Expense ratio 0.20% 0.20%
Already in the S&P 500 92.0% 99.9%
Holdings 941 102
Net assets $3.1bn $20.8bn

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

About IYY

IYY 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, 92% of the fund by weight is stocks the S&P 500 also holds, across 941 positions, with the top ten at 36.4%.

About OEF

OEF tracks an index. 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, IYY or OEF?
In the year to Oct 9, 2026, with distributions reinvested, IYY returned +16.8% and OEF +16.8%.
Which is cheaper, IYY or OEF?
Neither: IYY and OEF both charge 0.20% a year. Fees come from each fund's prospectus.
How much do IYY and OEF overlap with the S&P 500?
By their latest filed holdings, 92% of IYY and 100% of OEF by weight is stocks the S&P 500 already holds.
Other comparisons
CGDV vs IYYIYY vs SCHBIYY vs QUALIYY vs VVOEF vs SNPEBDYN vs OEFOEF vs USCLOEF vs SPYX
IYY on its own →OEF on its own →Hold both: look the portfolio through →Rankings →Standards and sources →
Where these figures came from
IYY and OEF filings on SEC EDGAR ↗IYY prospectus with the expense ratio (SEC) ↗iShares page for IYY ↗OEF prospectus with the expense ratio (SEC) ↗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, IYY against OEF, data as of Oct 9, 2026. https://etfiq.com/compare/any/iyy-vs-oef

Open data

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