New York—Dow Jones & Co. announced that The Wall Street Journal will launch an online stock market-tracking feature next month as the newspaper shrinks to a smaller size. The new feature, “Market Data Center,” will debut Jan. 2—the same day the Journal goes to a smaller format—and will be offered for free on WSJ.com. It will provide stock and index scanning and charting capabilities; integrated access to news headlines; and e-mail delivery of market information, including the Journal’s Money Rates. Each day, users will be able to scan more than 5,500 issues that trade on the New York Stock Exchange, NASDAQ and American Stock Exchange. A tour of the new Markets Data Center is available at www.wsj.com/mdctour .