UPDATE: 11/1/11, 11:15 a.m., EDT. The CFTC and the operator for the Chicago Mercantile Exchange have released a statement accusing MF Global of misusing customers’ money by mixing it with the company’s own funds. Click here for MF Global’s legal structure.

Skadden, Arps, Slate, Meagher, & Flom, Sullivan & Cromwell, and Weil, Gotshal & Manges are playing key advisory roles on Monday’s Chapter 11 filing by commodities and financial derivatives broker MF Global Holdings. Eight firms, including S&C and Wachtell, Lipton, Rosen & Katz, appear on a list of the brokerage’s largest unsecured creditors.