etf overlap · moderate overlap
DIA vs ITOT overlap
28% of DIA and ITOT is the same money, spread over 30 companies both funds hold.
Holdings as of September 24, 2026 · source: SPDR (DIA), iShares (ITOT) · How we measured all 1,035 pairs
- same money
- same companies, extra weight
- only in this fund
The companies you would own twice
What only one of them gives you
Every DIA holding is also in the other fund.
Where each fund puts its money
DIA and ITOT: what people ask
How much do DIA and ITOT overlap?
28% by weight, as of September 24, 2026: moderate overlap. 30 companies appear in both funds; they make up 100% of DIA and 35% of ITOT.
Which stocks do DIA and ITOT 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 DIA and ITOT?
Out of every $100 split evenly between them, about $28 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 0 names only in DIA, 2,395 only in ITOT. Half in each behaves like 44 equally weighted stocks, against 21 for DIA alone and 55 for ITOT 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 SPDR 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.