Last updated: January 19, 2026
Diversification is the practice of spreading investments across various assets, sectors, and geographies to reduce portfolio risk.
The core principle: don't put all your eggs in one basket. When one investment declines, others may hold steady or rise.
True diversification requires assets that don't move together (low correlation). Simply owning many stocks in the same sector isn't diversified.
Understanding diversification helps you make better investment decisions and plan for taxes. Use our portfolio risk checker to see how it applies to your situation.
It reduces 'unsystematic risk'—the risk of any single investment failing. While it won't eliminate market crashes, it prevents one bad stock from ruining your entire portfolio.
Most experts suggest 15-30 stocks across different sectors. Alternatively, a single broad index fund or ETF can provide instant diversification across hundreds of stocks.
Yes (sometimes called 'diworsification'). Owning too many assets can dilute your returns and make the portfolio hard to track. The goal is balance, not just owning everything.
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