etf overlap · light overlap

IVV vs VO overlap

15% of IVV and VO is the same money, spread over 241 companies both funds hold.

Holdings as of September 30, 2026 · source: iShares (IVV), Vanguard (VO) · How we measured all 1,035 pairs

overlapfull holdings, by weight
15%of each fund is money the other holds at the same weight, across 241 shared companies.
IVV
15%85%
VO
15%75%9%
  • same money
  • same companies, extra weight
  • only in this fund
Overlap = the sum, over companies both funds hold, of the smaller of the two weights. Cash and derivatives excluded.
01Shared

The companies you would own twice

held by bothtop 15 of 241
companyIVVVO
MARATHON PETROLEUM logoMPCMARATHON PETROLEUM0.20%1.10%
VALERO ENERGY CORP logoVLOVALERO ENERGY CORP0.20%1.10%
PHILLIPS 66 logoPSXPHILLIPS 660.18%1.01%
NENEMNEWMONT0.18%0.60%
FTFTNTFORTINET0.17%0.55%
QUANTA SERVICES INC logoPWRQUANTA SERVICES INC0.15%0.95%
JOHNSON CONTROLS INTERNATIONAL PLC logoJCIJOHNSON CONTROLS INTERNATIONAL PLC0.14%0.45%
CECEGCONSTELLATION ENERGY CORP0.14%0.85%
DDDDOGDATADOG INC CLASS A0.14%0.91%
WMWMBWILLIAMS0.13%0.41%
HWHWMHOWMET AEROSPACE0.13%0.89%
VRVRTVERTIV HOLDINGS CLASS A0.13%0.92%
MODERNA logoMRNAMODERNA0.13%0.34%
HEWLETT PACKARD ENTERPRISE logoHPEHEWLETT PACKARD ENTERPRISE0.13%0.79%
HOHOODROBINHOOD MARKETS CLASS A0.12%0.88%
02Different

What only one of them gives you

only in IVV263 names
NVIDIA logoNVDANVIDIA8.04%
APPLE logoAAPLAPPLE7.51%
MICROSOFT logoMSFTMICROSOFT5.95%
AMAZON.COM INC logoAMZNAMAZON.COM INC3.74%
ALPHABET CLASS A logoGOOGLALPHABET CLASS A3.06%
BROADCOM INC logoAVGOBROADCOM INC2.47%
ALPHABET CLASS C logoGOOGALPHABET CLASS C2.45%
META PLATFORMS CLASS A logoMETAMETA PLATFORMS CLASS A2.44%
only in VO30 names
NENETCloudflare Inc1.11%
Warner Bros Discovery Inc logoWBDWarner Bros Discovery Inc0.73%
SNSNOWSnowflake Inc0.55%
MSMSTRStrategy Inc0.55%
ALALABAstera Labs Inc0.55%
LNLNGCheniere Energy Inc0.55%
Corteva Inc logoCTVACorteva Inc0.51%
RKRKLBRocket Lab Corp0.41%
03Sectors

Where each fund puts its money

sectorsIVV vs VO, share of each fund
Information Technology38.62%15.56%
Industrials7.96%18.71%
Financials11.51%14.97%
Health Care9.45%9.25%
Consumer Discretionary8.71%8.77%
Energy3.70%8.61%
Communication Services9.79%2.22%
Utilities1.97%7.69%
Consumer Staples4.71%4.81%
Real Estate1.70%4.78%
Materials1.63%4.33%
04Questions

IVV and VO: what people ask

questions4 answered

How much do IVV and VO overlap?

15% by weight, as of September 30, 2026: light overlap. 241 companies appear in both funds; they make up 15% of IVV and 91% of VO.

Which stocks do IVV and VO both hold?

The largest shared positions are MPC, VLO, PSX, NEM and FTNT. Ranked by the smaller of the two weights, which is the part you would own twice.

Is it redundant to hold both IVV and VO?

Out of every $100 split evenly between them, about $15 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 263 names only in IVV, 30 only in VO. Half in each behaves like 137 equally weighted stocks, against 44 for IVV alone and 206 for VO alone. Whether that duplication is a problem depends on the mix you want; this is a description, not advice.

How is ETF overlap calculated here?

For every company held by both funds we take the smaller of its two weights and add them up. The weights come from the full holdings files iShares and Vanguard publish, not a top-10 sample, and companies are matched by their ISIN so share classes stay apart. Sector overlap applies the same rule to the issuers' sector labels; "behaves like N equally weighted stocks" is one over the sum of the squared weights.

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Weights come from each issuer's published holdings file and are matched company by company on their ISIN. Cash, futures and currency positions are left out. This page describes what the funds hold; it is not investment advice.