etf overlap tool · little overlap
VGT vs IWM overlap
4.3% of VGT and IWM is the same money, spread over 162 companies both funds hold.
Holdings as of September 30, 2026 · source: Vanguard (VGT), iShares (IWM) · How we measured all 1,431 pairs
- same money
- same companies, extra weight
- only in this fund
Hold VGT and IWM with other funds or stocks? The free portfolio optimizer opens VGT 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.
What only one of them gives you
Where each fund puts its money
VGT and IWM: what people ask
How much do VGT and IWM overlap?
4.3% by weight, as of September 30, 2026: little overlap. 162 companies appear in both funds; they make up 4.3% of VGT and 12% of IWM.
Which stocks do VGT and IWM both hold?
The largest shared positions are FROG, MXL, IDCC, PLXS and SLAB. Ranked by the smaller of the two weights, which is the part you would own twice.
Is it redundant to hold both VGT 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: 156 names only in VGT, 1,809 only in IWM. Half in each behaves like 51 equally weighted stocks, against 13 for VGT 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.
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.