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IYY vs VOO: Differences, Returns & Fees

IYY and VOO hold 92% of their weight in the same names. Net assets: $3.1bn on Oct 9, 2026 for iShares Dow Jones U.S. ETF, and $1.0tn on Sep 30, 2026 for Vanguard S&P 500 ETF.

VOO costs 0.17 points a year less; their one-year returns differ by 0.5 points; VOO is far larger, $1.0tn against $3.0bn.

IYY vs VOO: Differences, Returns & Fees
IYYVOO
Expense ratio0.20%0.03%
Net assets, as of Sep 30, 2026$3.0bn$1.0tn
Total return, 1 year+16.8%+17.3%
What it tracksDow Jones U.S. IndexS&P 500 Index
Holdings in common92%
Top ten holdings, share of the fund36.4%37.8%

Holdings in common uses holdings dated Aug 31, 2026 and Oct 9, 2026.

+16.8%
IYY total return, 1 year
+17.3%
VOO total return, 1 year
0.20%
IYY expense ratio
0.03%
VOO expense ratio

What they hold in common

By the books each fund has filed, IYY and VOO hold 92% 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 Aug 31, 2026 and Oct 9, 2026.

half

92% in common

Positions both hold, largest shared weight first
Holding IYY VOO
NVIDIA 7.68% 8.09%
APPLE 6.80% 7.04%
MICROSOFT 5.50% 5.70%
AMAZON.COM INC 3.56% 3.85%
ALPHABET CLASS A 2.86% 3.01%
BROADCOM INC 2.38% 2.65%
ALPHABET CLASS C 2.29% 2.40%
META PLATFORMS CLASS A 2.19% 1.90%
MICRON TECHNOLOGY 1.61% 1.64%
TESLA INC 1.49% 1.57%
BERKSHIRE HATHAWAY INC CLASS B 1.33% 1.40%
ELI LILLY 1.31% 1.38%
Only in IYY
SPACE EXPLORATION TECHNOLOGIES COR 0.31%
SNOWFLAKE 0.18%
CLOUDFLARE CLASS A 0.16%
BLOOM ENERGY CLASS A 0.11%
CHENIERE ENERGY 0.08%
NATERA 0.08%
STRATEGY INC CLASS A 0.08%
ASTERA LABS 0.07%
Only in VOO
Warner Bros Discovery Inc 0.11%
MKTLIQ 0.05%
Paramount Skydance Corp 0.01%
SLBBH1142 0.00%
ABIOMED INC-CVR 0.00%
HOLOGIC INC - CVR (APRIL 2026) 0.00%

Check overlap with more funds →

On the same fields

IYY
iShares Dow Jones U.S. ETF
VOO
Vanguard S&P 500 ETF
Where it sits Stock ETF Stock ETF
Issuer iShares Vanguard
What it is Tracks an index Tracks the S&P 500
Total return, 1 year +16.8% +17.3%
Its benchmark over the same days not published +17.3% (IVV)
Gap to its benchmark not available 0.0 pts vs IVV
Expense ratio 0.20% 0.03%
Already in the S&P 500 92.0% 99.7%
Holdings 941 507
Net assets, IYY as of Oct 9, 2026 and VOO as of Sep 30, 2026 $3.1bn $1.0tn

IYY and VOO 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 VOO

VOO tracks the S&P 500. Over the year to Oct 9, 2026 it returned +17.3% with distributions reinvested, against +17.3% for its benchmark, the S&P 500 Index. The prospectus expense ratio is 0.03% a year. By its holdings published by its issuer as of Aug 31, 2026, 100% of the fund by weight is stocks the S&P 500 also holds, across 507 positions, with the top ten at 37.8%.

Questions people ask

Which returned more over the last year, IYY or VOO?
In the year to Oct 9, 2026, with distributions reinvested, IYY returned +16.8% and VOO +17.3%.
Which is cheaper, IYY or VOO?
VOO is cheaper, by 0.17 percentage points a year. That is about $17 on $10,000 held for a year. Fees come from each fund's prospectus.
How much do IYY and VOO overlap with the S&P 500?
By their latest filed holdings, 92% of IYY and 100% of VOO by weight is stocks the S&P 500 already holds.
Other comparisons
IYY vs SPYIYY vs VTIDYNF vs IYYCGDV vs IYYSNPE vs VOOBDYN vs VOOUSCL vs VOOSPYX vs VOO
IYY on its own →VOO on its own →Hold both: look the portfolio through →Rankings →Standards and sources →
Where these figures came from
IYY filings on SEC EDGAR ↗IYY prospectus with the expense ratio (SEC) ↗iShares page for IYY ↗VOO filings on SEC EDGAR ↗VOO prospectus with the expense ratio (SEC) ↗Vanguard page for VOO ↗

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 VOO, data as of Oct 9, 2026. https://etfiq.com/compare/any/iyy-vs-voo

Open data

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