NEW YORK - Bankrupt MF Global Holdings Ltd. (MFGH) on March 6 filed a brief in the U.S. Bankruptcy Court for the Southern District of New York seeking to subordinate and reclassify claims filed by a former employee based on money he says he is owed from the MFGH employee stock program (In Re: MF Global Holdings Ltd., No. 11-15059, Chapter 11, S.D. N.Y. Bkcy.).