| A.C.T. Operating Company |
000194 |
| A D D Productions |
007848 |
| Apache Corporation |
027200 |
| Arkland Producing Co., Inc. |
030791 |
| Bell, Johnny Inc. |
063255 |
| Bettis, Boyle & Stovall |
068360 |
| Betwell Oil & Gas Company |
068405 |
| Boyd & McWilliams Energy Group |
084545 |
| Breck Operating Corp. |
089974 |
| Caminar Oil & Gas, LLC |
127247 |
| Carroll Operating, LLC |
135844 |
| Centaur Petroleum Corporation |
141030 |
| Central Texas Operating, Inc. |
141255 |
| Chambers, R. H. LLC |
143549 |
| Cholla Petroleum, Inc. |
150683 |
| Clear Fork, Incorporated |
159500 |
| Clear Water Inc. |
159643 |
| Cockrell Production Co., Inc. |
164305 |
| Corda Corporation |
177997 |
| Creed Operating Co., LLC |
188555 |
| Crown Equipment Co. |
191534 |
| Denteco Oil Company LLC |
215939 |
| Denton Exploration, Inc. |
216418 |
| Devon Energy Production Co, L.P. |
216378 |
| D.J. & T. Energy |
196227 |
| Double M Petroproperties, Inc. |
224867 |
| D. W. R. Oil Co., Inc. |
195925 |
| E.G.L. Resources, Inc. |
238522 |
| Enrich Oil Corporation |
253100 |
| Ernmar Investments, Inc. |
253489 |
| Figure 3 Operating LLC |
267818 |
| Finley Resources, Inc. |
268602 |
| Foree Oil Company |
275700 |
| G & F Oil, Inc. |
292000 |
| Gillespie Operating LLC |
305848 |
| Ginnings Company |
307243 |
| Gray, Gordon Operator |
326571 |
| Gunn Oil Company |
339493 |
| Halliburton Operating Company |
347191 |
| HGN Operating I, LLC |
383323 |
| Ikard, Alan |
422893 |
| Kirkpatrick Oil Company |
468890 |
| Lainco, Inc. |
482345 |
| Lane Operating Company |
484815 |
| Lawlis Oil Company |
490133 |
| L.C.S. Production Company |
479574 |
| Leclair Operating, L.L.C. |
493412 |
| Leffel'S, Inc. |
495318 |
| Martin Petroleum Corp. |
530880 |
| Mercury Operating, LLC |
560337 |
| Mid-Con Energy Operating, LLC |
564673 |
| Midland Oil And Gas, Inc. |
565589 |
| Ohlhausen Oil Company |
619390 |
| O'Ryan Oil And Gas |
617042 |
| Patton Exploration, Inc. |
643730 |
| Petex |
659782 |
| Phillips, Bob |
662705 |
| Pride Energy Company |
677050 |
| Proco Operating Co., Inc. |
679595 |
| Proline Energy Resources Inc |
681327 |
| Quail Well Service, Inc. |
684502 |
| Rainey, Wayne |
688760 |
| Redbud E & P, Inc. |
696678 |
| RHB Exploration & Production,LLC |
704802 |
| RMB Operating LLC |
714207 |
| Rover Petroleum Operating, LLC |
730462 |
| Ruby Operating Company, Inc |
732775 |
| S.B. Street Operating, Inc. |
740251 |
| Scout Energy Management LLC |
760218 |
| Sharp Image Energy, Inc. |
770731 |
| Sheridan Production Company, LLC |
775854 |
| Sojourner Drilling Corporation |
800750 |
| Southlake Exploration, Inc. |
805550 |
| Susanna Corporation |
830708 |
| Sweetwater Production, Inc. |
833297 |
| TCS Petroleum Co., LLC |
840311 |
| TDC Engineering, Inc. |
840400 |
| Terrell Oil & Gas Production Co. |
843390 |
| Texas Pharchem Inc. |
945618 |
| Texoma Oil Tools, Inc. |
850566 |
| Texxol Operating Company, Inc. |
850964 |
| Urban Oil & Gas Group, LLC |
879035 |
| Van Operating, LTD. |
881442 |
| Viathon Hydrocarbons, Inc. |
884917 |
| Walsh & Watts, Inc. |
895060 |
| Walton Producing Inc. |
895444 |
| White Wing Petroleum |
916979 |