Adds shareholding, background in pars 3,4

ROME, Dec 12 (Reuters) - Camfin, the family vehicle of Pirelli's PIRC.MI executive vice chairman Marco Tronchetti Provera, is planning to increase its stake in the tyremaker to 29.9% from 26.1%, Italian daily Il Messaggero reported on Thursday.

To fund the operation and to cut the cost of its debt, Camfin is working to obtain 650 million euros ($682.96 million) in financing from a pool of banks led by UniCredit and Intesa Sanpaolo and including Banco BPM, the newspaper said.

Camfin is Pirelli's second-largest shareholder behind China's Sinochem 600500.SS which holds a 37% stake. The Chinese group's influence in the company has been curbed by measures taken by the Italian government. Tronchetti Provera has been in charge of Pirelli since 1992.

Last month a senior government official said Italy was checking whether the presence of Sinochem executives on Pirelli's board was in breach of measures Rome imposed to protect the tyremaker's autonomy.

($1 = 0.9517 euros)

(Reporting by Stefano Bernabei, Writing by Alvise Armellini, editing by Giulia Segreti)

((alvise.armellini@thomsonreuters.com;))