When to sell: It's the age-old investing question. Berkshire Hathaway
Motley Fool co-founder David Gardner has racked up some big returns for investors by recommending stocks such as Amazon.com
Amazon, Berkshire, Marvel, and Netflix are Motley Fool Stock Advisor recommendations. Berkshire Hathaway is also an Inside Value pick. Take-Two, NYSE Euronext, and Intuitive Surgical are Motley Fool Rule Breakers recommendations. Read more on David's stock picks with a free 30-day trial subscription to The Motley Fool's investment services.