Tech Five: Pandora sinks off downgraded rating

A down analyst rating is fueling a slide in stock price for Pandora. Let's take a look at the technology stocks to watch Tuesday:

Pandora. Shares of the streaming music service plunged 4.5% in pre-market trading after FBR Capital Markets downgraded the company's stock to sell, CNBC reports. Last quarter, Pandora's revenue and earnings beat forecasts, but listener hours fell short of estimates.

BlackBerry. The smartphone maker really wants consumers to trade in their iPhones. The company's Trade Up program is offering iPhone owners up to $550 to trade in their device for a BlackBerry Passport. The offer starts December 1.

Hewlett-Packard. The personal computer maker reports fourth quarter earnings after the markets close Tuesday. Analysts forecast revenue of more than $28 billion with an earnings per share of $1.06.

T-Mobile. The wireless carrier agreed to a deal with the Federal Communications Commission where it will be more transparent about the speed of mobile Internet connections.

Apple. The company's latest iPhones have boosted downloads on its App Store, reports Venturebeat. Download volumes were up more than 40% compared to last year.

Follow Brett Molina on Twitter: @brettmolina23.