Cellnex Telecom SAU is nearing a bid with infrastructure fund F2i SGR SpA for a stake in Telecom Italia SpA's wireless-tower unit to expand its holdings in the country, according to people familiar with the matter. The two companies are preparing an offer together as early as the second week of December to purchase a stake of about 40 percent in Milan-based Inwit SpA, said the people, who asked not to be named because the project is private.