With its surprise launch on March 21, Google Finance gave notice that there's a new, albeit well-connected, kid on the block; according to Hitwise, Google Finance in its debut week was number 28 in the Business Information category. For the week ended March 25, Yahoo Finance dominated with 31.9 percent market share, while Google Finance's share was only 0.53 percent.

Still, by March 28, visitors to the Google site stayed there for an average of 8 minutes 23 seconds, only 6 second behind the category average; and visitors tend to be younger and wealthy.

"Average session time when viewed alongside increased market share is a great measure of early adoption for content sites," said Bill Tancer, general manager of global research for Hitwise.

"While the Google Finance market share is still relatively small compared against Yahoo Finance and MSN Money Central, the rapid ramp in average session time for Google Finance indicates that Google searchers are interacting with this new financial portal offering," Tancer said.

Google Finance visitors were also more likely to have incomes over $150,000, with 19 percent in that income bracket, compared with 10 percent of visitors to Yahoo Finance in the same period, according to Hitwise.