I looked on their recent SEC filings and this is the only thing I found:
NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES OF GMX RESOURCES, INC.
New York Stock Exchange LLC (the 'Exchange' or the 'NYSE') hereby notifies the Securities and Exchange Commission ('SEC') of its intention to remove the entire class of each of the Common Stock and the 9.25% Series B Cumulative Preferred Stock (collectively, the 'Securities') of GMX Resources, Inc. (the 'Company') from listing and registration on the Exchange at the opening of business on May 14, 2013, pursuant to the provisions of SEC Rule 12d2-2(b), because, in the opinion of the Exchange, the Securities are no longer suitable for continued listing and trading on the Exchange. Pursuant to Listed Company Manual Section 802.01D, NYSE Regulation made this determination on behalf of the Exchange because of the Company's April 1, 2013 announcement that it had filed a voluntary petition for relief under Chapter 11 of the Bankruptcy Code in the United States Bankruptcy Court for the Western District of Oklahoma ('Chapter 11 filing'). In making its delisting determination, NYSE Regulation noted the uncertainty as to the timing and outcome of the bankruptcy process, as well as the uncertainty with respect to the ultimate effect of the Company's Chapter 11filing on the economic rights of holders of the Securities.