CME Group, the giant derivatives marketplace, will own 90 percent of a new joint venture with Dow Jones & Co. that will own the Dow Jones Indexes, including the blue-chip Dow Jones Industrial Average, the companies said Wednesday. Dow Jones, a unit of Rupert Murdoch's News Corporation, will take a 10 percent stake in the new joint venture, which has approximately 130,000 index properties, the firms said in a joint statement released after the New York stock market closed.