Three funds can still leave you holding the same stocks
The number of investments in your account does not tell the whole story. What they own matters more.
A portfolio can look varied while depending on the same small group of businesses. Owning several funds is not, by itself, proof that your investments are spread across different risks.
The SEC describes diversification as spreading money among different investments to reduce risk. That can mean holding different kinds of assets, such as stocks and bonds, and spreading investments within each asset class across companies and industries.
Funds can make that easier. Mutual funds and exchange-traded funds pool money from many investors and invest in a portfolio of assets. A single fund can therefore give an investor exposure to many holdings. But a fund focused on one industry is a different proposition from a broadly spread portfolio.
The SEC warns that a narrowly focused mutual fund or ETF may not provide the diversification an investor expects. It also suggests checking the top holdings of multiple funds to see whether they are different. Two funds with different names may have considerable overlap.
That is the useful question behind the fund count: are you adding a different set of investments, or buying more exposure to the same ones? Checking holdings is more informative than counting the logos on an account statement.
Diversification is a way to manage risk, not a promise of positive returns. The right mix also depends on the investor's time horizon and tolerance for losses. This article explains a concept; it does not recommend a particular portfolio.