CME Group Inc. (CME) received two subpoenas to produce "information and witnesses" in legal probes into the collapse of MF Global Holdings (MFGLQ), one of the biggest players on CME's derivatives markets, according to a regulatory filing Tuesday.

A grand jury in the Northern District of Illinois and the Commodity Futures Trading Commission both issued subpoenas to Chicago-based CME, the world's largest futures exchange operator and MF Global's main regulator at the exchange level in the U.S.

CME separately received a request for documents from the Securities Investor Protection Corp., which took over liquidation of MF Global's estate following the futures firm's bankruptcy filing on Oct. 31, the exchange group disclosed in a filing.

Representatives for CME Group had no immediate comment.

CME has been at the center of the MF Global fallout since the firm's demise, coordinating a shift of its customers to other brokerage firms, putting up a financial guarantee aimed to help return some money to MF's former clients and participating in probes of the episode.

An estimated $1.6 billion in customer assets remains out of reach for the trustee unwinding MF Global's brokerage business, and former customers have to date gotten back about 72 cents on every dollar they had with MF Global.

-By Jacob Bunge, Dow Jones Newswires; 312 750 4117; jacob.bunge@dowjones.com

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