A buyout deal for Burger King Holdings Inc by investment firm 3G Capital is being valued at $24 per share, or about $4 billion, cable business channel CNBC reported on Thursday.

Shares in Burger King, the No. 2 U.S. hamburger chain, surged 23 percent to $23.20 after the report.

A source briefed on the matter told Reuters on Wednesday that Burger King was discussing a sale with 3G.

Burger King and 3G officials were not immediately available for comment.

(Reporting by Michele Gershberg, editing by Gerald E. McCormick)