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 (NASDAQ: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.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.