etf overlap tool · little overlap

VTI vs IWM overlap

95% of IWM's money sits in companies VTI also holds; 3.8% of the two funds is the same money, spread over 1,841 companies both hold.

Holdings as of September 30, 2026 · source: Vanguard (VTI), iShares (IWM) · How we measured all 1,431 pairs

overlapfull holdings, by weight

3.8%of each fund is money the other holds at the same weight, across 1,841 shared companies.

VTI

96%

3.8% in IWM

IWM

95% in VTI

same money
same companies, extra weight
only in this fund

Hold VTI and IWM with other funds or stocks? The free portfolio optimizer opens VTI and IWM beside the rest of what you own: the companies you hold twice, what the funds cost a year, and where the next deposit should go. No account.

01Shared

The companies you would own twice

held by bothtop 15 of 1,841

companyVTIIWM

TWTWSTTwist Bioscience Corp0.02%0.30%

TXTXG10X Genomics Inc0.01%0.28%

MOMOG-AMoog Inc0.01%0.36%

FRFROGJFrog Ltd0.01%0.32%

HUHUTHut 8 Corp0.01%0.24%

BTBTSGBrightSpring Health Services Inc0.01%0.35%

VSVSATViasat Inc0.01%0.26%

CYCYTKCytokinetics Inc0.01%0.29%

GKGKOSGlaukos Corp0.01%0.33%

PTPTGXProtagonist Therapeutics Inc0.01%0.27%

UMUMBFUMB Financial Corp0.01%0.34%

KRKRYSKrystal Biotech Inc0.01%0.28%

JXJXNJackson Financial Inc0.01%0.28%

CTCTRECareTrust REIT Inc0.01%0.30%

PCPCVXVaxcyte Inc0.01%0.30%

02Different

What only one of them gives you

only in VTI1,675 names

NVDANVIDIA Corp7.13%

AAPLApple Inc6.63%

MSFTMicrosoft Corp5.19%

AMZNAmazon.com Inc3.30%

GOOGLAlphabet Inc2.76%

AVGOBroadcom Inc2.28%

METAMeta Platforms Inc2.18%

GOOGAlphabet Inc2.18%

only in IWM130 names

SSSSRMSSR MINING0.23%

MMMMEDMINIMED INC0.17%

BIBIPCBROOKFIELD INFRASTRUCTURE CORP CLA0.16%

GTGTXGARRETT MOTION0.15%

MRMRXMAREX GROUP LTD0.15%

GLGLNGGOLAR LNG0.15%

CRCRSPCRISPR THERAPEUTICS AG0.15%

LILIVNLIVANOVA PLC0.15%

03Sectors

Where each fund puts its money

sectorsVTI vs IWM, share of each fund

Information Technology37.17%12.83%

Financials11.73%19.72%

Health Care9.95%19.84%

Industrials9.26%13.79%

Consumer Discretionary8.56%9.31%

Communication Services9.34%2.37%

Energy3.55%7.02%

Real Estate2.08%5.88%

Consumer Staples4.17%2.06%

Materials1.92%4.17%

Utilities1.89%2.87%

04Questions

VTI and IWM: what people ask

questions4 answered

How much do VTI and IWM overlap?

3.8% by weight, as of September 30, 2026: little overlap. 1,841 companies appear in both funds; they make up 3.8% of VTI and 95% of IWM.

Which stocks do VTI and IWM both hold?

The largest shared positions are TWST, TXG, MOG-A, FROG and HUT. Ranked by the smaller of the two weights, which is the part you would own twice.

Is it redundant to hold both VTI and IWM?

Out of every $100 split evenly between them, about $4 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 1,675 names only in VTI, 130 only in IWM. Half in each behaves like 207 equally weighted stocks, against 55 for VTI alone and 834 for IWM 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.

Hold VTI and IWM?Import your positions and see what your funds hold together, company by company, with the fees you pay on each.Import my portfolio

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.