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What does a well diversified self-managed investment portfolio look like?
Diversified is relative. Alfred has all his money in Apple.  He's done very well over the last 10 years, but I think most investors would say that he's taking an incredible risk by putting everything on one stock. Betty has stock in Apple, Microsoft, and Google.  Compared to Alfred, she is diversified. Charlie looks at Betty and realizes that she is only investing in one particular industry.  All the companies in an individual industry can have a downturn together, so he invests everything in an S&P 500 index fund. David looks at Charlie and notes that he's got everything in large, high-capitalization companies.  Small-cap stocks are often where the growth happens, so he invests in a total stock market fund. Evelyn realizes that David has all his money tied up in one country, the United States.  What about the rest of the world?  She invests in a global fund. Frank really likes Evelyn's broad approach to equities, but he knows that some portion of fixed-income assets (e.g. cash deposits, bonds) can reduce portfolio volatility—and may even enhance returns through periodic rebalancing. He does what Evelyn does, but also allocates some percentage of his portfolio to fixed income, and intends to maintain his target allocations. Being diversified enough depends on your individual goals and investing philosophy.  There are some who would say that it is wrong to put all of your money in one fund, no matter what it is.  Others would say that a sufficiently broad index fund is inherently diversified as-is.