(Telecompaper) Activist investor Elliott Management is increasing its stake in Telecom Italia (TIM) in a bid to counter how the operator's largest investor Vivendi is running the company, according to unnamed sources cited by Bloomberg. Elliott is mulling the possibility of nominating directors to TIM's board and pushing for other changes at the company, said the sources, adding that the hedge fund is concerned about the operator's falling stock and business performance since Vivendi took majority control of the board.