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 (NASDAQ:WW) 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.