According to the Wall Street Journal the best stock of 2015 was Netflix. It was up 134%. The worst stock of 2015 was Chesapeake Energy. It was down 77%.
You can see the list of best stocks here:
http://blogs.wsj.com/briefly/2015/12/31/5-best-performers-in-the-sp-500-in-2015/
You can see the list of worst stocks here:
How did your investments do in 2015? What was your best stock? What was your worst? If you are not tracking your investment’s performance, consider using EquityStat. With EquityStat you can track the overall performance of your portfolio as well as the performance of each individual investment. EquityStat tracks the annualized return, year to date return, daily gain, overall gain and many other metrics of your investments. With these metrics you can easily determine what are your best investments and what are your worst investments.