My portfolio is useful feature in Google Finance which can be used by investors to track every stocks and mutual funds of companies once add transactions in myportfolio.
If add the transaction of buying any stock after adding symbol ( if you do not know the symbol of company ,then add full name of company ), date , nos. of shares and price . Google finance shows your shares market value , your current gain and you can record your sold shares and check your performance on same window . One more benefit is that your can watch news relating to your portfolio and also import , download and delete your made portfolios