MILAN- Italian entrepreneur Francesco Gaetano Caltagirone has raised his stake in insurer Generali to just over 6% ahead of a board meeting this month where top management appointments are expected to be discussed.

Caltagirone, Generali's second largest investor, in April snubbed the company's AGM in a sign that he was unhappy with the balance of power among shareholders, sources told Reuters. 

This week he added to his previous 5.96% stake by buying more than 1 million shares, or 0.07% of the insurer's total capital, through vehicle VM 2006, a filing with market regulator Consob showed.

Caltagirone, whose businesses span construction to publishing, also has a stake in Mediobanca, Generali's top investor with a 12.9% stake.

Trieste-based Generali is due to appoint a new board next spring and speculation has mounted over the future of CEO Philippe Donnet due to tensions among top shareholders.

(Reporting by Francesca Landini, writing by Giuia Segreti; editing by Jason Neely) ((francesca.landini@thomsonreuters.com; +39 02 66129437; Reuters Messaging: reutersitaly.thomsonreuters@reuters.net))