Walt Weissman, founder of TradeLink, a Chicago-based futures firm, has teamed up with former Chicago Board of Trade chairman Nickolas Neubauer to become the latest potential bidder for the assets of Refco, the scandal-hit futures broker which filed for bankruptcy last week.

Their bid came as Interactive Brokers Group, which has submitted the highest bid so far of about $858m (€711m), said it had gained access via a confidentiality agreement to Refco's data in order to conduct due diligence for its offer.