“United Natural Foods Inc. closed its $2.9 billion purchase of Supervalu Inc. on Monday, with Supervalu shares disappearing from the New York Stock Exchange as the first sign of the completed takeover.

In coming months, United Natural aims to sell Supervalu’s grocery store chains, including Cub Foods, and narrow its business to wholesale distribution similar to its own.

United Natural Foods (UNFI), based in Providence, R.I., is the nation’s largest distributor of organic and natural foods. With Supervalu, the company will more than double its size and expand its reach into traditional foods and grocery stores.

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