Ferrero, the Italian company behind Nutella and Ferrero Rocher, is reportedly pursuing a $3 billion deal to acquire WK Kellogg. The potential acquisition comes as WK Kellogg struggles to gain market share in the competitive U.S. cereal market. News of the deal has triggered a rally in WK Kellogg's stock price, indicating investor optimism about the potential merger and its impact on the cereal maker's future performance.