Exchange operator CME Group Inc. (CME) has issued a $300 million guarantee to help the trustee overseeing MF Global Holdings Ltd. accounts, the CME's executive chairman told CNBC on Friday.

"Our guarantee is to help assist [the trustee] in the transferring of secured collateral to [MF Global] clients," Terry Duffy told the network. "This is something that we think is in the best interest of the industry, and CME Group and its clients."

Fifty million dollars of the $300 million guarantee comes from CME's trust, Duffy said.

CME regulates futures firms like MF Global. It regularly reviewed MF Global's records, including making a full audit of the firm in August, a CME representative told the Wall Street Journal, according to a Thursday report.

"MF Global did not default to the CME clearinghouse. MF Global had other issues," Duffy told CNBC, when asked about potential changes in the auditing of futures firms. "All of our positions had enough margin so they did not default to our clearinghouse."

MF Global filed for Chapter 9 bankruptcy on Oct. 31.

Websites: www.cnbc.com

-Dow Jones Newswires; 212-416-2900

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