Strange days indeed
The shares have increased more than sevenfold from their IPO price of $85, boosting the nine-year-old company's market value to $190 billion.
That's more than bigger, more mature businesses like Wal-Mart, Coca-Cola, Hewlett-Packard and IBM.
Microsoft's market value is about $280 billion.
Google is now the No. 12 U.S. company based on market cap.