Ralcorp Holdings is an American manufacturer of various food products, including breakfast cereal, cookies, crackers, chocolate, snack foods, mayonnaise, pasta, and peanut butter. The company is based in St. Louis, Missouri. The majority of the items Ralcorp makes are private-label, store-brand products. It has over 9,000 employees. Ralcorp has its headquarters in the Bank of America Plaza in downtown St. Louis.
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Chex is an American brand of breakfast cereal currently manufactured by General Mills. It was originally known as Shredded Ralston, first produced in 1936 and owned by Ralston Purina of St. Louis, Missouri, then later renamed Chex in 1950. The Chex brand went with corporate spinoff Ralcorp in 1994 and was then sold to General Mills in 1997. Rival cereal company Kellogg's has the rights to the Chex brand in South Korea and Singapore.
The name "Chex" reflects the square checkerboard logo of Ralston Purina.