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| Aera Energy LLC | Bakersfield, CA |
| American Warrior Inc. | Gardend City, KS |
| Anglo-Suisse Offshore Partners LLC | Houston, TX |
| Antero Resources Corp. | Denver, CO |
| Aspect Energy LLC | Denver, CO |
| Badger Oil Corp. | Lafayette, LA |
| Ballard Exploration Co. Inc. | Houston, TX |
| BASA Resources Inc. | Dallas, TX |
| BEPCO LP | Fort Worth, TX |
| BEREXCO Inc. | Wichita, KS |
| BNP Petroleum Corp. | Houston, TX |
| Brammer Engineering INc. | Shreveport, LA |
| Burnett Oil Co. Inc. | Fort Worth, TX |
| Century Exploration Co. | Lexington, KY |
| Chinn Exploration Co. | Longview, TX |
| Cholla Petroleum Inc. | Dallas, TX |
| Citation Oil & Gas Corp. | Houston, TX |
| Cobra Oil & Gas Corp | Wicihta Falls, TX |
| Coleman Oil & Gas | Farmington, NM |
| Continental Operating Co. | Houston, TX |
| Crawley Petroleum Corp. | Oklahoma City, OK |
| Crimson Resources Management | Denver Co. |
| Crownquest Operating LLC | Midland, TX |
| Danmark Energy Services Inc. | White Oak, TX |
| Davis Petroleum Corp. | Houston, TX |
| Decker Operating | Houston, TX |
| Dugan Production Corp. | Farmington, NM |
| Duncan Oil Properties Inc. | Oklahoma City, OK |
| Elm Ridge Resources Inc. | Dallas, TX |
| Endeavor Energy Resources LP | Midland, TX |
| Energy Production Corp. | Dallas, TX |
| Enervest Operating LLC | Houston, TX |
| Famcor Oil Inc. | Houston, TX |
| Fasken Oil and Ranch Ltd. | Midland, TX |
| Faulconer, Vernon Inc. | Tyler, TX |
| Finley Resources Inc. | Fort Worth, TX |
| Force 5 Energy LLC | Houston, TX |
| Gary Samuel Jr. & Assoc. Inc. | Denver, CO |
| Great Western Drilling Co. | Midland, TX |
| Gunn Oil. Co. | Wichita Falls, TX |
| Harrison Interests Ltd. | Houston, TX |
| Headington Oil Co. LP | Dallas, TX |
| Helis WM. G. Co. LLC | New Orleans, LA |
| Hendrix, John Corp. | Midland, TX |
| Hilcorp Energy Co. | Houston, TX |
| Holiman Oil Corp. | San Antonio, TX |
| Huber JM Corp | Houston, TX |
| Hunt Oil Co. | Dallas, TX |
| Hunt Petroleum AEC Inc. | Houston, TX |
| Hunt Petroleum Corp. | Dallas, TX |
| Hurd Enterprises Ltd. | San Antonio, TX |
| Jamex Inc. | Dallas, TX |
| Jetta Operating Co. Inc. | Fort Worth, TX |
| JMA Energy Co. LLC | Oklahoma City, OK |
| Jones Energy Ltd. | Austin, TX |
| J-W Operating Co. | Addison, TX |
| Kaiser-Francis Oil Co. | Tulsa, OK |
| Killam Oil Co. Ltd. | Laredo, TX |
| Klabzuba Oil & Gas Inc. | Fort Worth, TX |
| Koch Exploration Co. | Calgary, AB |
| Laredo Petroleum Inc. | Tulsa, OK |
| Lario Oil & Gas Co. | Wichita, KS |
| Leo Energy LP | Houston, TX |
| Lewis Petroleum Properties Inc. | San Antonio, TX |
| LLOG Exploration Co. | Metarie, LA |
| Luff Exploration Co. | Denver, CO |
| MacPherson Oil Co. | Santa Monica, CA |
| Manti Operating Co. | Corpus Christi, TX |
| Marbob Energy Corp | Artesia, NM |
| McGowan Working Partners | Jackson, MS |
| Merit Energy Co. | Dallas, TX |
| Merrion Oil & Gas Corp. | Farmington, NM |
| Mewbourne Oil Co. | Tyler, TX |
| Midroc Operating Co. | Dallas, TZX |
| Mosbacher Energy Co. | Houston, TX |
| Mull Drilling Co. Inc. | Wichita, KS |
| Murfin Drilling Co. Inc. | Wichita, KS |
| Muskegon Development Co. | Mount Pleasure, MI |
| Nadel & Gussman | Tulsa, OK |
| Nadel & Gussman -- Jetta Operating Co. | Ruston, LA |
| Neumin Production Co. | Point Comfort, TX |
| Nielson & Assoc. Inc. | Cody, WY |
| Opal Resources LLC | Houston, TX |
| Osborn Heirs Co. | San Antonio, TX |
| Petrogulf Corp. | Denver, CO |
| Petro-Hunt LLC | Dallas, TX |
| Phoenix Exploration Co. LP | Houston, TX |
| Primary Natural Resources Inc. | Tulsa, OK |
| Proteus Energy Corp. | * |
| Pursue Energy Corp | Brandon, MS |
| Red Willow Production Co. | Ignacio, CO |
| Resolute Natural Resources | Denver, CO |
| Rimrock Energy LLC | Denver, CO |
| Royal Production Co. Inc. | Corpus Christi, TX |
| Sabco Operating Co. | Houston, TX |
| Samson Lone Star LLC | Tulsa, OK |
| Samson Resources Co. | Tulsa, OK |
| Sanchez Oil & Gas Corp. | Laredo, TX |
| Sanguine Gas Exploration LLC | Tulsa, OK |
| Shelby Resources LLC | Lakewood, CO |
| Signal Hill Petroleum | Long Beach, CO |
| Slawson Exploration Co. Inc. | Wichita, KS |
| Smith Production Inc. | Houston, TX |
| Sovereign | Houston, TX |
| Special Energy Corp. | Stillwater, OK |
| Square Mile Energy LLC | Houston, TX |
| Stephens Production Co. | Fort Smith, AR |
| Strat Land Exploration Co. | Tulsa, OK |
| Texas American Resources Co. | Austin, TX |
| Texas Petroleum Investment Co. | Houston, TX |
| Texland Petroleum LP | Fort Worth, TX |
| Thompson J Cleo | Dallas, TX |
| Tidelands Oil Production Co. | Long Beach, CA |
| Tana Exploration Co. LLC | Houston, TX |
| Tri-C Resources Inc. | Houston, TX |
| Trio Consulting & Management LLC | Wichita Falls, TX |
| True Oil LLC | Casper, WY |
| Union Gas Operating Co. | Houston, TX |
| US Enercorp LTD | San Antonio, TX |
| Valence Operating Co. | Kingwood, TX |
| Verado Energy Inc. | Dallas, TX |
| Vess Oil Corp | Wichita, KS |
| Wagner Oil Co. | Fort Worth, TX |
| Walsh Production Inc. | Sterling, CO |
| Walter Oil & Gas Corp | Houston, TX |
| Ward Petroleum Corp | Enid, OK |
| West Bay Exploration Co. | Traverse City, MI |
| Western Oil & Gas Development Corp. | Oklahoma City, OK |
| Winchester Production Co. | Jonesville, TX |
| Wolverine Energy LLC | East Lansing, MI |
| Wooley Petroleum Corp. | Wichita, KS |
| Yates Petroleum Corp. | Artesia, NM |
| Yuma Exploration and Production Co. Inc. | Houston, TX |
SOURCE: IHS Herold * Insufficient data for ranking. |
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