The price of a share of Google rose above $500 for the first time Tuesday.
That gives the world's most-used Internet search engine a market value of $154 billion just eight years after two Stanford University graduate students started the company in a California garage.
The stock was first issued at $85 a share in August of 2004.
Some analysts say the stock will earn a bit less than $14 a share next year, making its price very high in comparison to its earnings.
But other experts say surging revenue and the expectation of further gains are fueling the rise in stock price.
Some information for this report was provided by AP and Bloomberg.