Diversifying is the key to minimize investment risk. When you are diversifying, how many assets should you have in your portfolio? Well, you don't need to invest in tons of different companies, but investing in 5-6 different assets can help spread out your risk. Diversification doesn't mean you have to invest in tons of companies, assets, or markets. Even just 3 or 4 assets can help you profit if you choose your assets wisely.