Google's long-anticipated acquisition of online ad service DoubleClick is expected to turn the Internet search leader into an even more...

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SAN FRANCISCO — Google’s long-anticipated acquisition of online ad service DoubleClick is expected to turn the Internet search leader into an even more powerful marketing vehicle that’s fueled by better insights about consumers.

The $3.1 billion deal, completed Tuesday after nearly a year of regulatory wrangling, also may intensify the pressure on Microsoft and Yahoo to resolve their stormy courtship so they don’t risk further distractions while Google tries to sprint further ahead in the race for Internet advertising.

Google took control of DoubleClick a few hours after Europe’s antitrust regulators removed the final barrier by approving a deal that was first announced 11 months ago.

U.S. regulators cleared the transaction in December, casting aside objections from Microsoft and other companies that argued DoubleClick would give Google too much control over online advertising and potentially sensitive information about consumer behavior on the Internet.

Besides opening up new opportunities, Google’s takeover of DoubleClick will create more challenges for a management team already grappling with concerns about how the slowing U.S. economy will affect the company’s earnings growth this year.

Google Chairman Eric Schmidt acknowledged in a statement that the biggest acquisition in the company’s 9 ½-year history probably will trigger an unspecified number of layoffs after years of relentless hiring. The looming job cuts will be concentrated in the United States, although Schmidt said offices in other countries could be affected.

New York-based DoubleClick has 1,500 employees with offices in France, England, Germany, Ireland, Spain, Australia and Spain. Mountain View, Calif.-based Google employs nearly 17,000 workers, up from 1,600 just four years ago.

Google’s recently slumping shares soared with the rest of the stock market Tuesday, gaining $26.22, or 6.3 percent, to $439.84. The company’s stock price remains down 36 percent this year.

DoubleClick is expected to broaden Google’s already extensive reach in the $40 billion Internet advertising market.

Google has been the market’s most dominant player so far, generating more than $16 billion in revenue last year. Most of the money flowed in from short, written ads that Google places alongside search results and other Web content.

DoubleClick specializes in placing more dynamic multimedia ads, a form of marketing that is expected to become more important in the next few years as big companies spend more money promoting their brands online.

With somewhere between $300 million and $400 million in annual revenue, DoubleClick isn’t expected to have a significant impact on Google’s profit this year.

But the addition is bound to give Google an important advantage over its rivals, said Russ Mann, chief executive of Covario, which helps manage and analyze online advertising campaigns.

Standard & Poor’s equity analyst Scott Kessler isn’t convinced the deal will pay off for Google as quickly as some might think, largely because the company doesn’t have a track record of mining big profits from its past acquisitions. For instance, Google paid $1.76 billion for online video leader YouTube in November 2006, but the site still isn’t producing significant profits.

“It’s definitely a big deal, but whether they can execute on the potential remains to be seen,” Kessler said.

But just the prospect of Google growing even stronger now that DoubleClick is in its fold could be enough to prompt Microsoft to step up its pursuit of Yahoo or withdraw its offer to spend the money on other expansion opportunities.

Microsoft has offered to buy Yahoo for more than $40 billion, but the unsolicited bid has been at a standstill for the past month because the two sides can’t agree on a price.

Microsoft declined to comment Tuesday. Yahoo didn’t immediately respond to requests for comment.

Associated Press business reporter Aoife White in Brussels, Belgium, contributed to this article.