Yahoo Inc. on Monday will unveil an upgraded version of its top-ranked financial information site that features new stock charting tools, improved investor chat rooms and financial video news.

In a bid to expand the audience for its investor tools, Yahoo Finance also plans to allow other Web sites to embed stock charts, quotes, and financial news headlines from Yahoo, free of charge, on other sites using a small amount of code.

Yahoo Finance is introducing this feature, but before long you will see this coming from other parts of Yahoo, said Yahoo Finance General Manager Peggy White of plans to allow other Web sites to serve up Yahoo entertainment, sports or news items.

Finance.yahoo.com attracts 33 percent of the U.S. online finance market, or a nearly three times bigger audience than its closest rival, MSN MoneyCentral, with a 13 percent share, according to data from Web measurement firm Hitwise.