etf overlap · heavy overlap
IWDA vs CSPX overlap
71% of IWDA and CSPX is the same money, spread over 442 companies both funds hold.
Holdings as of October 14, 2026 · source: iShares (IWDA), iShares (CSPX) · How we measured all 1,431 pairs
- same money
- same companies, extra weight
- only in this fund
The companies you would own twice
What only one of them gives you
Where each fund puts its money
IWDA and CSPX: what people ask
How much do IWDA and CSPX overlap?
71% by weight, as of October 14, 2026: heavy overlap. 442 companies appear in both funds; they make up 71% of IWDA and 99% of CSPX.
Which stocks do IWDA and CSPX 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 IWDA and CSPX?
Out of every €100 split evenly between them, about €71 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 806 names only in IWDA, 62 only in CSPX. Half in each behaves like 59 equally weighted stocks, against 83 for IWDA alone and 44 for CSPX alone. Whether that duplication is a problem depends on the mix you want; this is a description, not advice.
Do IWDA and CSPX track the same index?
No. IWDA (ISIN IE00B4L5Y983) tracks the MSCI World index, CSPX (ISIN IE00B5BMR087) the S&P 500. As of October 14, 2026, 806 companies are only in IWDA (28% of the fund) and 62 only in CSPX (1.1% of it).
Does the IWDA vs CSPX overlap apply to other tickers?
Yes. IWDA also trades as SWDA (London, GBP; Borsa Italiana, EUR) and EUNL (Xetra, EUR). CSPX also trades as CSP1 (London, GBP), SXR8 (Xetra, EUR) and CSSPX (Borsa Italiana, EUR). Each is the same portfolio in another currency, on another exchange or paying its dividends out, so EUNL vs SXR8 also overlaps 71%.
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.