What’s Driving Yahoo’s Stock Up?

Yahoo! (NASDAQ:YHOO) beat expectations Monday afternoon with its quarterly earnings report, and the stock was reacting positively. Yahoo shares climbed before Tuesday morning’s open, up over 3 percent in pre-market trading, but backed off slightly after.

Yahoo’s quarterly results might have had some investors giddy behind the gates, as they were released after Monday’s close. The results cast Yahoo in a positive light, posting a full-year gain in revenue for the year — its first since 2008. Yahoo’s gain was modest, but showed the company has more potential than it used to.

The company’s new CEO, Marissa Mayer, may have something to do with the turnaround. Mayer joined Yahoo in mid-July, after working at Google (NASDAQ:GOOG), and since her arrival, hares have climbed over 30 percent. Adding to the positivity, the company’s ad prices were higher and more money came from overseas investment…