DIA vs MDY: how much do they overlap?
SPDR Dow Jones Industrial Average ETF Trust (DIA) · SPDR S&P MIDCAP 400 ETF Trust (MDY)
overlap by weight · 0 shared holdings
DIA: 30 holdings (as of 09-Jul-2026) · MDY: 400 holdings (as of 09-Jul-2026)
Low overlap
What this means
DIA and MDY hold mostly different stocks. Combining them genuinely spreads your exposure across different parts of the market.
Overlap by weight sums the smaller of the two funds' weights for every stock they both hold — it answers "how much of my money is in the same stocks either way?" See methodology.
Top shared holdings
| Company | Ticker | in DIA | in MDY |
|---|
FAQ
How much do DIA and MDY overlap?
DIA and MDY have a 0% overlap by weight, sharing 0 holdings (out of 30 in DIA and 400 in MDY), based on official issuer holdings as of 09-Jul-2026.
What does 0% overlap mean?
DIA and MDY hold mostly different stocks. Combining them genuinely spreads your exposure across different parts of the market.
Which stocks do DIA and MDY both hold?
The largest shared positions are . The full list of top shared holdings with weights in each fund is shown on this page.