etf overlap · light overlap

VO vs ITOT overlap

15% of VO and ITOT is the same money, spread over 269 companies both funds hold.

Holdings as of September 30, 2026 · source: Vanguard (VO), iShares (ITOT) · 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 269 shared companies.
VO
15%84%
ITOT
15%85%
  • 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 269
companyVOITOT
Marathon Petroleum Corp logoMPCMarathon Petroleum Corp1.10%0.18%
Valero Energy Corp logoVLOValero Energy Corp1.10%0.18%
Phillips 66 logoPSXPhillips 661.01%0.16%
NENEMNewmont Corp0.60%0.16%
SNSNOWSnowflake Inc0.55%0.16%
FTFTNTFortinet Inc0.55%0.15%
NENETCloudflare Inc1.11%0.14%
Quanta Services Inc logoPWRQuanta Services Inc0.95%0.13%
Johnson Controls International plc logoJCIJohnson Controls International plc0.45%0.12%
CECEGConstellation Energy Corp0.85%0.12%
DDDDOGDatadog Inc0.91%0.12%
WMWMBWilliams Cos Inc/The0.41%0.12%
HWHWMHowmet Aerospace Inc0.89%0.12%
VRVRTVertiv Holdings Co0.92%0.12%
Moderna Inc logoMRNAModerna Inc0.34%0.11%
02Different

What only one of them gives you

only in VO2 names
Warner Bros Discovery Inc logoWBDWarner Bros Discovery Inc0.73%
WCWCNWaste Connections Inc0.38%
only in ITOT2,156 names
NVIDIA logoNVDANVIDIA7.19%
APPLE logoAAPLAPPLE6.72%
MICROSOFT logoMSFTMICROSOFT5.32%
AMAZON.COM INC logoAMZNAMAZON.COM INC3.35%
ALPHABET CLASS A logoGOOGLALPHABET CLASS A2.74%
BROADCOM INC logoAVGOBROADCOM INC2.21%
ALPHABET CLASS C logoGOOGALPHABET CLASS C2.20%
META PLATFORMS CLASS A logoMETAMETA PLATFORMS CLASS A2.18%
03Sectors

Where each fund puts its money

sectorsVO vs ITOT, share of each fund
Information Technology15.56%36.58%
Industrials18.71%9.01%
Financials14.97%11.88%
Health Care9.25%10.02%
Consumer Discretionary8.77%8.72%
Energy8.61%3.86%
Communication Services2.22%9.37%
Utilities7.69%1.96%
Consumer Staples4.81%4.49%
Real Estate4.78%2.05%
Materials4.33%1.90%
04Questions

VO and ITOT: what people ask

questions4 answered

How much do VO and ITOT overlap?

15% by weight, as of September 30, 2026: light overlap. 269 companies appear in both funds; they make up 99% of VO and 15% of ITOT.

Which stocks do VO and ITOT both hold?

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

Is it redundant to hold both VO and ITOT?

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: 2 names only in VO, 2,156 only in ITOT. Half in each behaves like 163 equally weighted stocks, against 206 for VO alone and 55 for ITOT 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 Vanguard and iShares 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.