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SAN FRANCISCO – Google’s earnings climbed 36 percent despite a deepening slump in its average ad prices as advertisers purchase a growing number of cheaper commercial pitches to reach people who connect to its search engine and other services on mobile devices.

The results released Thursday exceeded the analyst projections that steer investors. Google’s stock surged by more than 6 percent after the numbers came out.

Google Inc. earned nearly $3 billion, or $8.75 per share, during the three months ending in September. That compared to income of $2.2 billion, or $6.53 per share, at the same time last year.

If not for its expenses for employee stock compensation, Google said it would have earned $10.74 per share. That figure topped the average estimate of $10.36 per share among analysts polled by FactSet.

The Mountain View, Calif., company’s average ad price has declined from the prior year in each of the last eight quarters primarily because advertisers aren’t yet paying as much for mobile ads because the screens on smartphones and tablet computers are smaller than on laptop and desktop computers. As more people rely on mobile devices to connect to the Web, it’s driving down Google’s average ad price, or “cost per click.”

In Google’s latest quarter, that measure fell 8 percent from last year in the latest quarter. That was worse than the 6 percent year-over-year drop in the previous quarter.

Although Google is getting less money per ad, it’s getting paid more frequently.

Google’s stock gained $58.71, or 6.6 percent, to $947.50 in extended trading.