The Danger of Diversifying Without Really Diversifying
Buying multiple ETFs can still leave an investor heavily exposed to the same stocks and risks.
Intelligence analysis by GPT-5.4 Mini
The article warns that owning several ETFs does not automatically mean a portfolio is truly diversified. If the funds track the same index or similar themes, the holdings can overlap enough to concentrate risk instead of spreading it.
Buying two baskets that both contain the same apples and oranges does not make the fruit more varied. The article says ETFs can look different on the outside but still hold many of the same stocks inside.
Analysis
The core warning
The article argues that ETF buyers can get a false sense of safety when they own more than one fund. ETFs are often sold as easy diversification tools, but the author says that benefit disappears if the funds hold many of the same stocks.
Why overlap happens
The article says overlap is common because many stock ETFs follow the same broad indexes, and large U.S. tech names often sit near the top of those indexes. Sector and thematic ETFs can overlap too, since funds built around tech, healthcare, innovation, or other popular themes often chase the same widely held growth companies.
A simple example in the piece compares the Vanguard S&P 500 ETF and the iShares Core S&P 500 ETF. Even though one holds 505 stocks and the other 504 as of June 11, they both track the S&P 500, so their top holdings are the same, including Nvidia, Apple, and Microsoft. The point is not that these funds are bad; it is that owning both does not add much new exposure.
How to avoid the trap
The article recommends listing every ETF you own or plan to buy, then checking the holdings inside each one. It also suggests comparing top positions because overlap can exist even when fund names look different. For a faster check, it points readers to the ETF Research Center’s overlap tool, which shows how much two funds share in common.
The overall message is practical: diversification only helps if the holdings are actually different enough to spread risk.
Key points
- Owning multiple ETFs does not guarantee real diversification.
- Different ETFs can share many of the same underlying stocks.
- Broad index funds and thematic funds are especially likely to overlap.
- The article uses two S&P 500 ETFs as an example of duplicated exposure.
- Investors should review holdings and use overlap tools before buying.
If investors check overlap carefully, they can build portfolios that are more truly spread out across different companies and risks. That could make their ETF choices more efficient and avoid paying for duplicate exposure.
If investors ignore overlap, they may think they are safer than they really are. In a market drop, several similar ETFs could fall together because they own many of the same top stocks.
