Google reported the biggest job reduction in its nine-year history, cutting 300 positions at DoubleClick, the online advertising company it acquired last month for $3.24 billion.

About 300 out of DoubleClick's 1,200 U.S. staffs were fired, or placed in “transitional” roles, according to an email statement from Google.

The DoubleClick acquisition enhances Goggle's technology to sell and measure the effectiveness of display ads. The largest of Google's more than 37 acquisitions completed on March 11.

“We have been working to match and align DoubleClick employees in the U.S. with our organizational plan for the business,” according to Google spokesman Brandon McCormick, Bloomberg reported.

As part of the move, Google split Performics, DoubleClick's online marketing business, into two units. “One division sells services that help ads show up in search queries, while the other links advertisers and publishers,” Google said.

Tom Phillips, who directs the DoubleClick integration, noted that Google plans to sell the search unit in order to maintain its objectivity as a search engine. “The division will be run separately from Google until a buyer is found,” he wrote on a blog, Bloomberg reported.