Supermarket chain Kroger Co. (KR) said Chief Executive Officer David Dillon will retire in January and will be succeeded by Chief Operating Officer Rodney McMullen.

Mr. Dillon, 62, will continue to serve as chairman through the end of 2014. Mr. Dillon, a 37-year Kroger veteran, said Mr. McMullen has played a leadership role in every major decision the company has made for the past 25 years, including its current growth strategy.

Mr. McMullen, 53, joined Kroger in 1978 and has served as COO since 2009 and as a director since 2003. He has held a variety of leadership positions at the company, including vice chairman and chief financial officer. Mr. McMullen's successor will be named later, Kroger said.

Kroger, one of the U.S.'s largest grocery-store networks, has outpaced peers like Safeway Inc. (SWY) and Supervalu Inc. (SVU) in recent years by becoming more value-oriented ahead of the recession and implementing a rewards program to appeal to cost-conscious consumers. Kroger also withstood increasing competition from nontraditional grocery outlets such as dollar stores and big-box retailers.

The company in July unveiled plans to acquire U.S. grocery chain Harris Teeter Supermarkets Inc. (HTSI) for $2.44 billion, which will bring Kroger into more markets in the Southeast and give it about 200 higher-end supermarkets. The deal is Kroger's biggest acquisition in about 15 years.

Last week, Kroger reported its fiscal second-quarter earnings grew 14% as the chain's identical-store sales continued to rise.

Shares were off by 33 cents to $40.66 in premarket trading. The stock is up 72% over the past 12 months.

Write to Nathalie Tadena at nathalie.tadena@wsj.com

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