In this video from Monday's edition of Investor Beat, host Chris Hill and Motley Fool analysts Taylor Muckerman and Jason Moser dissect the hardest-hitting investing stories from the market today.

SolarCity (NASDAQ:SCTY) hit an all-time high today, after the stock got an upgrade from Goldman Sachs. Twitter (NYSE:TWTR), on the other hand, was down today on news of another downgrade for the high-flying new social-media stock, this time coming from Morgan Stanley. SiriusXM (NASDAQ:SIRI) rose today on the first day of trading since Liberty Media (NASDAQ:LMCA) announced it wanted to acquire the entire company; Liberty currently owns about 53% of SiriusXM. And finally, Pandora (NYSE:P) saw a big pop today, on news that its number of active listeners for December was up 13% year over year. In this segment, Taylor and Jason discuss four stocks making moves on the market today.

Chris Hill has no position in any stocks mentioned. Jason Moser owns shares of Twitter. Taylor Muckerman owns shares of SolarCity. The Motley Fool recommends Goldman Sachs, Pandora Media, SolarCity, and Twitter and owns shares of Liberty Media, Sirius XM Radio, and SolarCity. 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.