The following video is from Friday's Investor Beat, in which host Chris Hill, and analysts Ron Gross and Matt Argersinger, dissect the hardest-hitting investing stories of the day.

MercadoLibre (NASDAQ:MELI) posts strong second-quarter results. Weight Watchers (NYSE:WTW) loses profits and lowers guidance. Westport Innovations' (NASDAQ:WPRT) quarterly loss was worse than anyone was expecting. And the soap opera at Dell (UNKNOWN:DELL.DL) takes another dramatic turn. In this segment from Investor Beat, Motley Fool analysts Matt Argersinger and Ron Gross discuss four stocks making moves on Tuesday.

Chris Hill has no position in any stocks mentioned. Fool contributor Matthew Argersinger owns shares of MercadoLibre. Matthew Argersinger has the following options: long January 2015 $25 calls on Westport Innovations. Ron Gross owns shares of Dell. The Motley Fool recommends MercadoLibre and Westport Innovations. The Motley Fool owns shares of MercadoLibre and Westport Innovations. Try any of our Foolish newsletter services free for 30 days. We Fools may not 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.