etf overlap · little overlap

IWM vs ITOT overlap

3.8% of IWM and ITOT is the same money, spread over 1,378 companies both funds hold.

Holdings as of September 24, 2026 · source: iShares (IWM), iShares (ITOT) · How we measured all 1,035 pairs

overlapfull holdings, by weight
3.8%of each fund is money the other holds at the same weight, across 1,378 shared companies.
IWM
88%8%
ITOT
96%
  • 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 1,378
companyIWMITOT
BTBTSGBRIGHTSPRING HEALTH SERVICES INC0.31%0.01%
MOMOG-AMOOG INC CLASS A0.36%0.01%
GKGKOSGLAUKOS0.30%0.01%
TWTWSTTWIST BIOSCIENCE0.40%0.01%
PCPCVXVAXCYTE0.25%0.01%
UMUMBFUMB FINANCIAL0.33%0.01%
SMSMSM ENERGY0.28%0.01%
PTPTGXPROTAGONIST THERAPEUTICS0.28%0.01%
KRKRYSKRYSTAL BIOTECH0.30%0.01%
TXTXG10X GENOMICS CLASS A0.33%0.01%
EAEATBRINKER INTERNATIONAL INC0.30%0.01%
CYCYTKCYTOKINETICS0.29%0.01%
PBPBFPBF ENERGY CLASS A0.24%0.01%
OSOSCROSCAR HEALTH CLASS A0.23%0.01%
CTCTRECARETRUST REIT0.30%0.01%
02Different

What only one of them gives you

only in IWM597 names
FRFROGJFROG0.34%
SSSSRMSSR MINING0.25%
GLGLNGGOLAR LNG0.16%
MRMRXMAREX GROUP LTD0.15%
BIBIPCBROOKFIELD INFRASTRUCTURE CORP CLA0.14%
XEXENEXENON PHARMACEUTICALS0.12%
STSTNGSCORPIO TANKERS0.12%
KNKNSAKINIKSA PHARMACEUTICALS INTERNATIO0.11%
only in ITOT1,047 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

sectorsIWM vs ITOT, share of each fund
Information Technology13.72%36.58%
Financials19.01%11.88%
Health Care20.35%10.02%
Industrials14.05%9.01%
Consumer Discretionary8.77%8.72%
Communication Services2.45%9.37%
Energy6.76%3.86%
Real Estate5.68%2.05%
Consumer Staples1.95%4.49%
Materials4.21%1.90%
Utilities2.68%1.96%
04Questions

IWM and ITOT: what people ask

questions4 answered

How much do IWM and ITOT overlap?

3.8% by weight, as of September 24, 2026: little overlap. 1,378 companies appear in both funds; they make up 92% of IWM and 3.8% of ITOT.

Which stocks do IWM and ITOT both hold?

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

Is it redundant to hold both IWM and ITOT?

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: 597 names only in IWM, 1,047 only in ITOT. Half in each behaves like 204 equally weighted stocks, against 842 for IWM 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 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 IWM and ITOT?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.