etf overlap tool · heavy overlap
CSPX vs CNDX overlap
93% of CNDX's money sits in companies CSPX also holds; 54% of the two funds is the same money, spread over 86 companies both hold.
Holdings as of October 16, 2026 · source: iShares (CSPX), iShares (CNDX) · How we measured all 1,431 pairs
- same money
- same companies, extra weight
- only in this fund
Hold CSPX and CNDX with other funds or stocks? The free portfolio optimizer opens CSPX 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
SHOPSHOPIFY SUBORDINATE VOTING CLASS A0.90%Where each fund puts its money
CSPX and CNDX: what people ask
How much do CSPX and CNDX overlap?
54% by weight, as of October 16, 2026: heavy overlap. 86 companies appear in both funds; they make up 54% of CSPX and 93% of CNDX.
Which stocks do CSPX and CNDX both hold?
The largest shared positions are NVDA, AAPL, MSFT, AMZN and GOOGL. Ranked by the smaller of the two weights, which is the part you would own twice.
Is it redundant to hold both CSPX and CNDX?
Out of every €100 split evenly between them, about €54 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 417 names only in CSPX, 15 only in CNDX. Half in each behaves like 39 equally weighted stocks, against 44 for CSPX alone and 31 for CNDX alone. Whether that duplication is a problem depends on the mix you want; this is a description, not advice.
Do CSPX and CNDX track the same index?
No. CSPX (ISIN IE00B5BMR087) tracks the S&P 500 index, CNDX (ISIN IE00B53SZB19) the Nasdaq-100. As of October 16, 2026, 417 companies are only in CSPX (46% of the fund) and 15 only in CNDX (6.9% of it).
Does the CSPX vs CNDX overlap apply to other tickers?
Yes. CSPX also trades as CSP1 (London, GBP), SXR8 (Xetra, EUR) and CSSPX (Borsa Italiana, EUR). 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 SXR8 vs SXRV also overlaps 54%.
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 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.