Update 1:15 p.m. PT: I added information about the addition of real-time quotes on Yahoo Finance.
Real-time stock trading data aren't easy to come by on the Internet, but Google, CNBC, and The Wall Street Journal now can show real-time Nasdaq stock prices on their Web sites, the companies announced Monday.
Previously, the Nasdaq data had been available only with a 15-minute lag on the sites.
"With universal access to the Internet and the real-time nature of the Web, investors need real-time data, and now they don't have to pay for it," said Adena Friedman, executive vice president of the Nasdaq OMX group.
Google was equally exuberant. "It's important to have up-to-date market data," said group product manager Katie Jacobs Stanton on a Google Finance blog posting on Monday. "Prices will update automatically, once per second, to reflect current market conditions."
Yahoo, whose Yahoo Finance site long predates Google's rival, announced a partnership last week with BATS Trading to offer free real-time quotes on its quote summary page. The quotes, which Yahoo said cover the full market, will be expanded to portfolio and other finance pages in coming weeks, Yahoo said.
Google doesn't show New York Stock Exchange quotes in real time, however. "Currently, we are only able to provide real-time data that represents trades executed on the Nasdaq exchange," spokeswoman Anne Espiritu said in a statement.