EXHIBIT 4.13 LIST OF SHAREHOLDERS EXECUTING SHAREHOLDER AGREEMENT (FILED AS EXHIBIT 4.12) The following shareholders of Coda Energy, Inc. common stock, par value $.01, executed the shareholders agreement. These shareholders represent all the shareholders of Coda, except for Joint Energy Development Investments Limited Partnership. Randell A. Bodenhamer Joe I. Callaway J. David Choisser J. W. Freeman Roy Harney Grant W. Henderson Jarvis A. Hensley Chris A. Jackson Jarl P. Johnson Douglas H. Miller Gary M. Nelson Gary R. Scoggins Claude A. Seaman J. W. Spencer, III Scott E. Studdard