MILAN--Italian tire maker Pirelli & C SpA (PC.MI) said Tuesday that it renewed its shareholders' agreement until April 15, 2014.

The agreement, which had been set to expire this year, has been renewed with no changes.

Participants in the pact--which include Mediobanca SpA (MDIBY, MB.MI), Assicurazioni Generali SpA (G.MI), Intesa Sanpaolo SpA (ISNPY, ISP.MI), Fondiaria Sai SpA (FSA.MI), Camfin SpA (CMF.MI), Allianz SpA and Edizione Srl--agreed to renew the agreement for only one additional year, versus the previous pact's three-year period..

On Monday, Assicurazioni Generali Chief Executive Mario Greco said the insurer would be wiling to remain in Pirelli's shareholders' pact only if it were shortened to one year. Generali is among Pirelli's largest shareholders with a 4.41% stake.

Write to Manuela Mesco at manuela.mesco@dowjones.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires