etf overlap · little overlap

SPDR S&P 500 ETF Trust logoiShares Russell 2000 ETF logoSPY vs IWM overlap

SPY and IWM hold no company in common.

Holdings as of September 24, 2026 · source: SPDR (SPY), iShares (IWM)

overlapfull holdings, by weight
0.0%of each fund is money the other holds at the same weight, across 0 shared companies.
SPY
100%
IWM
100%
  • 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.
01Different

What only one of them gives you

only in SPY504 names
NVIDIA CORP logoNVDANVIDIA CORP8.19%
APPLE INC logoAAPLAPPLE INC7.38%
MICROSOFT CORP logoMSFTMICROSOFT CORP5.57%
AMAZON.COM INC logoAMZNAMAZON.COM INC3.69%
ALPHABET INC CL A logoGOOGLALPHABET INC CL A3.03%
META PLATFORMS INC CLASS A logoMETAMETA PLATFORMS INC CLASS A2.58%
BROADCOM INC logoAVGOBROADCOM INC2.51%
ALPHABET INC CL C logoGOOGALPHABET INC CL C2.43%
only in IWM1,975 names
TWTWSTTWIST BIOSCIENCE0.40%
MOMOG-AMOOG INC CLASS A0.36%
HUHUTHUT CORP0.35%
FRFROGJFROG0.34%
UMUMBFUMB FINANCIAL0.33%
TXTXG10X GENOMICS CLASS A0.33%
VSVSATVIASAT INC0.31%
BTBTSGBRIGHTSPRING HEALTH SERVICES INC0.31%
02Sectors

Where each fund puts its money

sectorsSPY vs IWM, share of each fund
Information Technology39.20%13.72%
Financials11.57%19.01%
Health Care9.28%20.35%
Industrials8.09%14.05%
Consumer Discretionary8.65%8.77%
Communication Services10.07%2.45%
Energy3.43%6.76%
Real Estate1.72%5.68%
Consumer Staples4.39%1.95%
Materials1.69%4.21%
Utilities1.86%2.68%
03Questions

SPY and IWM: what people ask

questions4 answered

How much do SPY and IWM overlap?

0.0% by weight, as of September 24, 2026: little overlap. 0 companies appear in both funds; they make up 0.0% of SPY and 0.0% of IWM.

Which stocks do SPY and IWM both hold?

None. SPY and IWM have no holding in common.

Is it redundant to hold both SPY and IWM?

Out of every $100 split evenly between them, about $0 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 504 names only in SPY, 1,975 only in IWM. 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 SPDR and iShares publish, not a top-10 sample, and companies are matched by their ISIN so share classes stay apart.

Hold SPY 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.