Yahoo to buy Right Media

Yahoo buys online ad auction network firm in response to Google buying DoubleClick.

Yahoo said on Monday that it is buying Right Media, which operates a real-time online ad auction network. The deal is worth about $680 million, in equal parts cash and Yahoo stock, for the 80 percent of Right Media that Yahoo does not already own.

In October, Yahoo led a $45 million Series B financing round in Right Media, which gave Yahoo a 20 percent stake in the company. The move comes about two weeks after Google said it was buying online ad company DoubleClick for $3.1 billion.