PITTSBURGH — Food company H.J. Heinz is eliminating 600 jobs across the U.S. and in Canada, including 350 in Pittsburgh, nearly a third of its operation there, it said today.

The company was sold in June and the layoffs were the result of a review of operations, spokesman Michael Mullen said. They’re intended to enable faster decision-making, increased accountability and accelerated growth, he said.

Mullen said that as part of the transition to a private company, the Heinz leadership “examined every piece of our business to better position Heinz in a very competitive global market” and that review “resulted in a number of difficult but necessary organizational changes.”

Warren Buffett’s Berkshire Hathaway and the Brazilian investment firm 3G Capital bought the company in a $23.3 billion deal.

Mullen said Heinz will remain headquartered in Pittsburgh, where it was founded in 1869. He said that after the reduction the company will employ about 800 people in the Pittsburgh region and 6,000 across North America.