The $1.2 billion in MF Global Inc. (MFGLQ) customer funds estimated to be missing began to flow out of the brokerage on Oct. 26, five days before its collapse, as its computers and employees failed to keep up with margin calls and demands for collateral, according to a trustee’s investigation.

James Giddens, the trustee overseeing the brokerage’s liquidation, said today that MF Global regularly used money from the segregated accounts of commodities customers to finance daily activities. During the firm’s final days, MF Global took out larger amounts as customers fled and a rush to meet collateral requirements led to billions of dollars in securities sales, credit draws and inter-company loans to foreign affiliates, he said in a statement.