In the following video, Motley Fool analyst John Reeves gives us his weekly wrap-up, discussing three companies that cratered this week. He tells us how Herbalife (NYSE:HLF) took a big hit after one analyst came out and called it a pyramid scheme, tells us why Markel (NYSE:MKL) fell after announcing it would be buying Alterra Capital (NASDAQ:ALTE), and discusses Research In Motion (NASDAQ:RIMM), which had been back on the rise, but fell this week after news from its conference call, saying that the company's vital service revenue may come into question next year.

John Reeves owns shares of Berkshire Hathaway. The Motley Fool owns shares of Berkshire Hathaway and Markel. Motley Fool newsletter services recommend Berkshire Hathaway and Markel. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.