Since revealing its first set of results after its August flotation, Google's share price has been on the up. Trading yesterday saw its stock rise almost 9% to $187.40, giving it a market capitalisation of $50.8bn (£27.6bn).
This now puts it ahead of Yahoo!, which, despite seeing its share price rise by 24 cents to $35.20, is now worth $47.8bn or $3bn less than Google.
The market has reacted positively to Google's results, out last week, that showed revenue doubled for the quarter to $805.9m and that it had made a profit of $52m.
At the same time, Google said that things were looking good for the future.
Chief executive Eric Schmidt said the company's "relentless technology innovation and market opportunity makes us very optimistic about our company's future".
Google and Yahoo! were one-time partners, but now Google is encroaching on areas such as email and shopping-search services. However, it has talked down reports that it is going to get involved in "browser wars" with Microsoft, or expand its website to compete with Yahoo! and MSN.
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