'Was This Too Much?': Ethanol King Shocks With $4.3 Billion Bet

Rubens Ometto gained a reputation as Brazil’s “Ethanol King” after turning his family’s sugarcane fields into one of the world’s largest biofuel companies. Now he’s making a $4.3 billion wager that could permanently reshape his empire.

The 72-year old billionaire is buying a minority stake in the world’s second-biggest iron-ore producer, Vale SA, capping a years-long effort to diversify into everything from gas stations to railways to hedge funds.

The proposed purchase stunned analysts and received a chilly reception from shareholders of Cosan SA, the Sao Paulo-based company in which Ometto owns a controlling stake worth about $2 billion. Cosan shares have fallen 14% since the Oct. 7 announcement on doubts Ometto, the grandson of farmers, can pull off his ambition of capitalizing on decarbonization through owning a piece of a mining company.

The race for ways to produce power with less fossil fuels has remade wealth around the world, with the electric-vehicle revolution boosting the fortunes of Tesla Inc.’s Elon Musk and lithium tycoon Julio Ponce Lerou. Ometto is hoping Vale — a major supplier of nickel, a key ingredient in electric-vehicle batteries — will give him a similar edge.