Cereal maker Post Holdings is buying Golden Boy Foods Ltd. and Dymatize Enterprises LLC to help expand its store-brand and nutrition businesses.

Post said Monday that it is buying privately held Golden Boy from affiliates of Tricor Pacific Capital Inc. and other shareholders for $300.2 million.. Golden Boy makes private label peanut butter and other nut butters. It also makes dried fruit, baking and snacking nuts. The Canadian company is a supplier to U.S. and Canadian retail and food-service companies.