By comparing your stock portfolio performance to index S&P500 you know if the time you spent on analyzing companies paid off. In fact, Warren Buffet recommends investing in an SP500 index fund if you have no knowledge investing in the stock market. Let´s see if your portfolio beats S&P500 over time.
In previous posts a few years ago I explained how to use NAV units to calculate stock portfolio performance. I am going to use Net Asset Value based on units in this post.