etf overlap tool · light overlap
DIA vs CNDX overlap
22% of DIA and CNDX is the same money, spread over 9 companies both funds hold.
Holdings as of October 16, 2026 · source: SPDR (DIA), iShares (CNDX) · How we measured all 1,431 pairs
- same money
- same companies, extra weight
- only in this fund
Hold DIA and CNDX with other funds or stocks? The free portfolio optimizer opens DIA and CNDX 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
Where each fund puts its money
DIA and CNDX: what people ask
How much do DIA and CNDX overlap?
22% by weight, as of October 16, 2026: light overlap. 9 companies appear in both funds; they make up 29% of DIA and 35% of CNDX.
Which stocks do DIA and CNDX 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 DIA and CNDX?
Out of every $100 split evenly between them, about $22 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 21 names only in DIA, 92 only in CNDX. Half in each behaves like 39 equally weighted stocks, against 22 for DIA alone and 31 for CNDX alone. Whether that duplication is a problem depends on the mix you want; this is a description, not advice.
What is CNDX, next to DIA?
CNDX is iShares Nasdaq 100 UCITS ETF (ISIN IE00B53SZB19), an Irish-domiciled UCITS fund on the Nasdaq-100 index. Next to DIA, 22% of the money is the same, spread over 9 companies both hold, as of October 16, 2026.
Does the DIA vs CNDX overlap apply to other tickers?
Yes. CNDX also trades as CNX1 (London, GBP), SXRV (Xetra, EUR) and CSNDX (Borsa Italiana, EUR). Each is the same portfolio in another currency, on another exchange or paying its dividends out, so DIA vs SXRV also overlaps 22%.
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.