etf overlap tool · moderate overlap
VTI vs DIA overlap
100.0% of DIA's money sits in companies VTI also holds; 27% of the two funds is the same money, spread over 30 companies both hold.
Holdings as of September 30, 2026 · source: Vanguard (VTI), SPDR (DIA) · How we measured all 1,431 pairs
- same money
- same companies, extra weight
- only in this fund
Hold VTI and DIA with other funds or stocks? The free portfolio optimizer opens VTI and DIA 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
AVGOBroadcom Inc2.28%
GOOGAlphabet Inc2.18%
TSLATesla Inc1.36%
LLYEli Lilly & Co1.34%Every DIA holding is also in the other fund.
Where each fund puts its money
VTI and DIA: what people ask
How much do VTI and DIA overlap?
27% by weight, as of September 30, 2026: moderate overlap. 30 companies appear in both funds; they make up 35% of VTI and 100.0% of DIA.
Which stocks do VTI and DIA both hold?
The largest shared positions are MSFT, AAPL, AMZN, GOOGL and NVDA. Ranked by the smaller of the two weights, which is the part you would own twice.
Is it redundant to hold both VTI and DIA?
Out of every $100 split evenly between them, about $27 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 3,486 names only in VTI, 0 only in DIA. Half in each behaves like 45 equally weighted stocks, against 55 for VTI alone and 22 for DIA 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 SPDR 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.