Struggling Rex Holdings Co. plans to sell its wholly owned supermarket chain Seijo Ishii Co. and is sounding out Itochu Corp., Marubeni Corp. and other trading houses as potential buyers, sources said.

Major supermarket chains are also showing interest in buying Seijo Ishii, a time-honored retailer known for its wide lineup of imported foods and its network of about 60 retail outlets in Tokyo, Osaka, Nagoya and other urban locations, the sources said.