Italy's EXOR SpA will consider raising its $6.4 billion offer for reinsurer PartnerRe Ltd at a board meeting next Tuesday, two sources told Reuters. The Italian holding company, controlled by the Agnelli family, made its all-cash offer for PartnerRe in April, disrupting an all-share deal between AXIS Capital Holdings Ltd. and PartnerRe to create one of the world's largest reinsurers with about $11 billion in market capitalization.