Smithfield Foods products are on display during WH Group's IPO in Hong Kong as the unit of the Chinese company sold its stake in Campofrio. Photo: Reuters Smithfield Foods has sold its entire 37 per cent stake in Campofrio Food Group for US$354 million in cash to Alfa, a Mexican conglomerate whose businesses include food, IT and automotive engine parts, the parent company of Smithfield said in a statement on Thursday.