Papadimitriou MILAN, Italy—Angelos Papadimitriou will vacate his position as general manager and co-chief executive officer at Pirelli & C. S.p.A. after just six months in the job. The Italian tire maker said the decision was mutual as Papadimitriou, who was named to the post in July, is pursuing "entrepreneurial elements in line with his experience gained over the years." Pirelli said Papadimitriou, who owns 170,000 shares of the company, will continue to serve as a board member as well as a member of Pirelli's Strategies Committee. Marco Tronchetti Provera, executive vice chairman and CEO, will assume Papadimitriou's responsibilities until a replacement is named.