Offer your thoughts or opinion on the input financial query or topic using your financial background.

What does a well diversified self-managed investment portfolio look like?
When you invest in a single index/security, you are completely exposed to the risk of that security. Diversification means spreading the investments so the losses on one side can be compensated by the gains on the other side. What you are talking about is one thing called "risk apettite", more formally known as Risk Tolerance: Risk tolerance is the degree of variability in investment returns that an investor is willing to withstand. (emphasis added) This means that you are willing to accept some losses in order to get a potential bigger return. Fidelity has this graph:  As you can see in the table above, the higher the risk tolerance, the bigger the difference between the best and worst values. That is the variability. The right-most pie can be one example of an agressive diversified portfolio. But this does not mean you should go and buy exactly that security compostion. High-risk means playing with fire. Unless you are a professional stuntman, playing with fire usually leaves people burnt. In a financial context this usually means the money is gone. Recommended Reading: Investopedia; Risk and Diversification: The Risk-Reward Tradeoff Investopedia; How to construct a High Risk portfolio Fidelity: Guide to Diversification KPMG: Understanding and articulating Risk Appetite (pdf)