June 1 (Reuters) - JPMorgan Chase & Co has returned about US$600 million (S$776 million) that was at the bank when MF Global Holdings Ltd went bust in October, the Wall Street Journal reported late on Friday citing people familiar with the matter.

MG Global's bankruptcy trustee James Giddens might have additional claims against JPMorgan for several hundred million dollars, the business daily said.

JPMorgan officials contend that the bank no longer holds any MF Global money, the Journal said citing the people.

A JPMorgan spokeswoman was unavailable for comment outside regular business hours.

Trustee James Giddens, who is unwinding MF Global's broker-dealer, is to provide a written report to the US Bankruptcy Court in Manhattan on the status of his investigation into the company's unravelling.