In Friday's edition of Investor Beat, host Alison Southwick and Motley Fool analysts Lyons George and Ron Gross dissect the hardest-hitting investing stories of the day.

Longtime Microsoft CEO Steve Ballmer announced today that he is retiring as soon as a replacement is found. In our lead story on Investor Beat, Ron and Lyons discuss what's next for the company.

Our analysts also take a look at four stocks that made big moves Friday. Google makes its largest venture deal ever. Gap takes a hit despite beating analyst expectations. Pandora is paying more for music. And Aeropostale isn't cool with teens or the market.

Finally, Ron and Lyons explain why they're keeping a close watch on shares of Tiffany and Control4.