We all agree that we need a diverse portfolio of shares. But how much is too much? Is it possible to have shares in too many companies. Is it possible to spread yourself too thin? When you have money to buy shares do you invest in your existing portfolio or do you simply buy new shares in a different company?
You diversify to reduce unsystematic risk. Generally, this effect gets less with every stock you add and should not give you much additional effects from roughly 17-2X stocks onward.
Or you just invest in an ETF, which is easier.