etf overlap tool · moderate overlap
VGT vs CSPX overlap
89% of VGT's money sits in companies CSPX also holds; 38% of the two funds is the same money, spread over 75 companies both hold.
Holdings as of September 30, 2026 · source: Vanguard (VGT), iShares (CSPX) · How we measured all 1,431 pairs
- same money
- same companies, extra weight
- only in this fund
Hold VGT and CSPX with other funds or stocks? The free portfolio optimizer opens VGT and CSPX 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
AMZNAMAZON.COM INC3.72%Where each fund puts its money
VGT and CSPX: what people ask
How much do VGT and CSPX overlap?
38% by weight, as of September 30, 2026: moderate overlap. 75 companies appear in both funds; they make up 89% of VGT and 38% of CSPX.
Which stocks do VGT and CSPX both hold?
The largest shared positions are NVDA, AAPL, MSFT, AVGO and MU. Ranked by the smaller of the two weights, which is the part you would own twice.
Is it redundant to hold both VGT and CSPX?
Out of every $100 split evenly between them, about $38 (half in each fund) buys identical positions. The rest is exposure only one of the two funds gives you: 243 names only in VGT, 428 only in CSPX. Half in each behaves like 23 equally weighted stocks, against 13 for VGT alone and 44 for CSPX alone. Whether that duplication is a problem depends on the mix you want; this is a description, not advice.
What is CSPX, next to VGT?
CSPX is iShares Core S&P 500 UCITS ETF (ISIN IE00B5BMR087), an Irish-domiciled UCITS fund on the S&P 500 index. Next to VGT, 38% of the money is the same, spread over 75 companies both hold, as of September 30, 2026.
Does the VGT vs CSPX overlap apply to other tickers?
Yes. 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 VGT vs SXR8 also overlaps 38%.
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 Vanguard 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.