Fiat SpA and Chrysler Group CEO Sergio Marchionne

Fiat SpA and Chrysler Group CEO Sergio Marchionne

Alessia Pierdomenico/Bloomberg

Fiat SpA and Chrysler Group LLC Chief Executive Officer Sergio Marchionne may create a new company in the U.S., merge Fiat and Chrysler into it and issue shares in the combined entity, a person familiar with the matter said last month.