etf overlap tool · heavy overlap
VOO vs IWF overlap
94% of IWF's money sits in companies VOO also holds; 59% of the two funds is the same money, spread over 179 companies both hold.
Holdings as of September 30, 2026 · source: Vanguard (VOO), iShares (IWF) · How we measured all 1,431 pairs
- same money
- same companies, extra weight
- only in this fund
Hold VOO and IWF with other funds or stocks? The free portfolio optimizer opens VOO and IWF 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.
The companies you would own twice
What only one of them gives you
Where each fund puts its money
VOO and IWF: what people ask
How much do VOO and IWF overlap?
59% by weight, as of September 30, 2026: heavy overlap. 179 companies appear in both funds; they make up 68% of VOO and 94% of IWF.
Which stocks do VOO and IWF both hold?
The largest shared positions are NVDA, AAPL, MSFT, GOOGL and AVGO. Ranked by the smaller of the two weights, which is the part you would own twice.
Is it redundant to hold both VOO and IWF?
Out of every $100 split evenly between them, about $59 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 326 names only in VOO, 192 only in IWF. Half in each behaves like 30 equally weighted stocks, against 43 for VOO alone and 21 for IWF 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.
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.