But the cable group and owner of NBC Universal is trying to fend off a rival offer from Fox, which already owns a 39% stake in Sky.
Brian Roberts, chairman and chief executive of Comcast said: “Comcast does not intend to pursue further the acquisition of the 21st Century Fox assets and, instead, will focus on our recommended offer for Sky.”
Last week Murdoch’s Fox made a €27 billion bid to buy Sky, only to be trumped hours later by a new Comcast offer of €29 billion.
The stakes are high for both US media empires as Sky’s 23 million pay-TV customers are a big draw.
The bidding battle between Disney, Comcast, and Fox is part of a bigger war to compete with the online streaming giants such as Netflix and Amazon.
Sky’s share price fell 2% on Thursday following Comcast’s news to pull out of the race for Fox. It indicates that investors fear Murdoch may not return with a higher bid now.
Under UK takeover rules, Murdoch has until August 8 to submit a new bid for Sky.
Comcast is the parent company of NBC, which has a stake in Euronews.
Read on EuroNews