Shares of Google Inc rose nearly 12 per cent after the Web search leader's profit beat forecasts for the first time in the last six quarters, boosted by strong advertising revenue and comments by its new chief financial officer on disciplined spending.
Google rallied to $673.50 in extended trading after closing at $601.78 on Nasdaq. That would mark an all-time high for the stock in regular trading if it closes at that level on Friday, adding roughly $40 billion to its market value.
Google remains the most valuable publicly traded U.S. company after Apple Inc.
Google's expenses rose 10 per cent to $12.9 billion in the second quarter ended June 30 from the year-ago quarter, and remained at 73 per cent of revenue, the company said on Thursday. But expenses only grew by $91 million from the first quarter, and as a percentage of revenue declined by 1 percentage point.
"The decline in quarter-over-quarter operating expenses reflects, in part, discipline in expense management and, in part, lower legal expenses than in comparable periods," CFO Ruth Porat told analysts on a conference call.
Google's stock rally also appeared to reflect Porat's comments. The stock was up a little over 7 per cent after the close of regular trading and steadily rose during the call as she talked about keeping expenses under control.
Advertising revenue grew 11 per cent to $16.02 billion from the year-ago quarter, while the number of ads, or paid clicks, rose 18 per cent, the company said.
Advertisers pay Google only if a user clicks on one of its ads. "Cost per click," or the average price of online ads, fell 11 per cent, but was more than offset by the increase in ad volumes.
Google's ad revenue has been under pressure as consumers access its services on mobile devices such as smartphones and tablets, whose ad rates are typically lower.
The company's consolidated revenue rose 11 per cent to $17.73 billion in the quarter.
Net income rose 17 per cent to $3.93 billion, or $4.93 for each Class A and B share, from $3.35 billion, or $4.88 per share.
Excluding one-time items, Google earned $6.99 per share.
Analysts on average had expected a profit of $6.70 per share, and revenue of $17.75 billion, according to Thomson Reuters I/B/E/S.