etf overlap · little overlap
VOO vs IWM overlap
VOO and IWM hold no company in common. Still, 66% of their money sits in the same sectors, led by Information Technology.
Holdings as of August 31, 2026 · source: Vanguard (VOO), iShares (IWM) · How we measured all 435 pairs
- same money
- same companies, extra weight
- only in this fund
What only one of them gives you
AMZNAmazon.com Inc3.84%No stock in common, 66% in the same sectors
VOO and IWM: what people ask
How much do VOO and IWM overlap?
None by holdings, as of August 31, 2026: no company appears in both funds. By sector, 66% of their money sits in the same sectors, led by Information Technology.
Which stocks do VOO and IWM both hold?
None. VOO and IWM have no holding in common.
Is it redundant to hold both VOO and IWM?
No. Out of every $100 split evenly between them, none buys the same company. Half in each gives you 2,480 different holdings that behave like 174 equally weighted stocks, against 46 for VOO alone and 842 for IWM alone. Whether that mix suits you depends on what you want to own; 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.
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.