etf overlap · nearly the same fund
CSPX vs VUAA overlap
97% of CSPX and VUAA is the same money, spread over 501 companies both funds hold.
Holdings as of September 30, 2026 · source: iShares (CSPX), Vanguard (VUAA) · 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
CSPX and VUAA: what people ask
Is VUAA the same as CSPX?
Nearly: 97% of the money in CSPX and VUAA sits in the same companies at the same weights, as of September 30, 2026. The other 2.6% is weight differences, plus 3 names only in CSPX and 2 only in VUAA.
How much do CSPX and VUAA overlap?
97% by weight, as of September 30, 2026: nearly the same fund. 501 companies appear in both funds; they make up 100% of CSPX and 100% of VUAA.
Which stocks do CSPX and VUAA 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 VUAA?
Out of every €100 split evenly between them, about €97 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 3 names only in CSPX, 2 only in VUAA. Half in each behaves like 44 equally weighted stocks, against 44 for CSPX alone and 43 for VUAA alone. Whether that duplication is a problem depends on the mix you want; this is a description, not advice.
Do CSPX and VUAA track the same index?
Yes, both track the S&P 500 index: CSPX is iShares' fund (ISIN IE00B5BMR087), VUAA Vanguard's (ISIN IE00BFMXXD54). Their files, dated October 14, 2026 and September 30, 2026, put 97% of the money in the same companies at the same weights; they are 14 days apart, and price moves and index changes in between account for part of the rest.
Does the CSPX vs VUAA overlap apply to other tickers?
Yes. CSPX also trades as CSP1 (London, GBP), SXR8 (Xetra, EUR) and CSSPX (Borsa Italiana, EUR). VUAA also trades as VUAG (London, GBP), and VUSA (ISIN IE00B3XXRP09) is its distributing share class. Each is the same portfolio in another currency, on another exchange or paying its dividends out, so SXR8 vs VUAG also overlaps 97%.
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 and Vanguard 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.