etf overlap · moderate overlap
SPY vs DIA overlap
29% of SPY and DIA is the same money, spread over 30 companies both funds hold.
Holdings as of September 24, 2026 · source: SPDR (SPY), SPDR (DIA)
- 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
SPY and DIA: what people ask
How much do SPY and DIA overlap?
29% by weight, as of September 24, 2026: moderate overlap. 30 companies appear in both funds; they make up 39% of SPY and 100% of DIA.
Which stocks do SPY and DIA both hold?
The largest shared positions are MSFT, AAPL, GOOGL, AMZN and NVDA. Ranked by the smaller of the two weights, which is the part you would own twice.
Is it redundant to hold both SPY and DIA?
Out of every $100 split evenly between them, about $29 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 474 names only in SPY, 0 only in DIA. 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 publish, not a top-10 sample, and companies are matched by their ISIN so share classes stay apart.
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.