A US bankruptcy judge ruled creditors of collapsed futures broker Refco can demand the banks that underwrote Refco's initial public offering turn over documents related to the brokerage's flotation.

According to an official at the US Bankruptcy Court, Judge Robert Drain agreed that the creditors committee could investigate the eight banks that served as underwriters of Refco's IPO in August 2005, two months before the brokerage firm filed for bankruptcy.