MILAN (Reuters) – Borsa Italiana, the company managing the Italian stock exchange, said on Friday its Chairman Andrea Sironi resigned, effective from April 27. Sironi, a leading international expert in governance and risk management, has been proposed by Generali’s outgoing board, backed by leading shareholder Mediobanca as the insurer’s new chairman. Borsa Italiana, which is part of Euronext Group said in a statement its board acknowledged Sironi’s resignation and was appointing current Deputy Chairwoman Claudia Parzani as its new chairwoman. (Reporting by Giulio Piovaccari; Editing by Chris …