Yahoo! Finance is the leading consumer finance website, and it plans to build on its lead over Google Inc. in the financial area. Yahoo! Finance has undergone a major revision in order to provide more flexibility to innovate and to reduce its dependence on data provided by third parties. In 2004, Yahoo! began construction of its own stock-ticker platform to avoid purchasing services from Bloomberg and Reuters. In addition to the expense of licensing, Yahoo! had to renegotiate its contracts with these vendors each time it wanted to use the financial information for new services. This renegotiation caused problems because it lengthened Yahoo!'s time-to-market. The company began working with Amex, Nasdaq, and the New York Stock Exchange to purchase stock-ticker data directly, reformat it, and then send it via the Internet to a network comprising hundreds of servers across the country, rather than use dedicated lines like other data vendors. Yahoo! uses its 'worldwide message bus,' which allows the firm to publish the ticker data once and distribute it many times. Yahoo! does this via data compression and filtering. This keeps the data packets to a relatively small size. Google Finance, on the other hand, is working with a single data aggregator, ComStock. Google decided to use one vendor as its source of financial data because it only has a small staff dedicated to the financial business.