| 1 | H & D Operating Company | Refugio, TX 78377 | Oil & Gas Operator | May 2015 |
| 2 | H & H Drilling Company | Davis, OK 73030-2703 | Oil & Gas Operator | May 2014 |
| 3 | H & H Energy Inc | Tuttle, OK 73089 | Oil Operator | May 2001 |
| 4 | H & H Exploration | Tulsa, OK 74132 | Oil & Gas Operator | Jan 2006 |
| 5 | H & H Oil Productions | Tulsa, OK 74145 | Oil Operator | Jul 1999 |
| 6 | H & H Operating | Olney, TX 76374 | Oil & Gas Operator | Dec 2025 |
| 7 | H & H Production | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 8 | H & H Production Company | Muenster, TX 76252 | Oil & Gas Operator | Oct 2005 |
| 9 | H & H Star Energy Inc | Traverse City, MI 49684 | Oil & Gas Operator | Aug 2016 |
| 10 | H & K Oil Company | Kilgore, TX 75662 | Oil & Gas Operator | Nov 1998 |
| 11 | H & L Operating Co., L.L.P. | Amarillo, TX 79114 | Oil & Gas Operator | Aug 2022 |
| 12 | H & L Operating Company | Amarillo, TX 79114 | Oil & Gas Operator | Feb 2020 |
| 13 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 14 | H & S Oil Company | Kellyville, OK 74039 | Oil & Gas Operator | Mar 1998 |
| 15 | H & T Brock Oil Company LLC | Comanche, OK 73529-7140 | Oil & Gas Operator | Feb 2024 |
| 16 | H & W Drilling Inc | Racine, OH 45769 | Oil & Gas Operator | Dec 2023 |
| 17 | H A Oil & Gas Company | Laverne, OK 73848-0100 | Gas Operator | Mar 2002 |
| 18 | H B Oil & Gas Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | Jun 2000 |
| 19 | H E C H Corporation | Ada, OK 74820-9528 | Oil Operator | Sep 2019 |
| 20 | H G & G Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2006 |
| 21 | H L L Inc | Scottsdale, AZ 85251 | Oil & Gas Operator | Jan 2007 |
| 22 | H R Collier Collier Oil & Gas | | Oil & Gas Operator | Oct 2025 |
| 23 | H-Petro-R Inc | Edmond, OK 73013 | Oil & Gas Operator | Sep 2025 |
| 24 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 25 | H2ok LLC | Marble Falls, TX 78654 | Oil & Gas Operator | Oct 2025 |
| 26 | H2ox Operating LLC | Tulsa, OK 74103 | Oil Operator | Oct 2025 |
| 27 | Haas Petroleum LLC | Prairie VIllage, KS 66208 | Oil Operator | Sep 2025 |
| 28 | Hadaway Consulting And Engineering LLC | Canadian, TX 79014 | Oil & Gas Operator | Nov 2025 |
| 29 | Hadaway Engineering Inc | Canadian, TX 79014 | Oil & Gas Operator | Jul 2015 |
| 30 | Hadco LTD | Ardmore, OK 73401-6929 | Oil & Gas Operator | Mar 2015 |
| 31 | Haddox Johnny C | Okemah, OK 74859-0254 | Oil Operator | Apr 2020 |
| 32 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 33 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 34 | Hagler William N | Farmington, NM 87499-0035 | Oil Operator | Apr 2014 |
| 35 | Hail Petroleum Corporation | Garland, TX 75047-5036 | Oil Operator | Mar 1997 |
| 36 | Hailey Energy Corporation | Wesson, MS 39191 | Gas Operator | May 2013 |
| 37 | Haines Oil Company | Sulphur, OK 73086 | Oil & Gas Operator | Oct 2009 |
| 38 | Haken Oil LLC | Glencoe, OK 74032-1500 | Oil Operator | Oct 2025 |
| 39 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Oct 2025 |
| 40 | Halcyon Natural Gas LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Nov 2025 |
| 41 | Hale John H | Tulsa, OK 74107 | Oil & Gas Operator | Mar 2000 |
| 42 | Halfway Oil Inc | Tahlequah, OK 74464-5448 | Oil & Gas Operator | Aug 2013 |
| 43 | Halgas Inc | Tulsa, OK 74101-3012 | Oil & Gas Operator | May 2013 |
| 44 | Hall And Kelley Oil & Gas | | Oil Operator | Dec 1995 |
| 45 | Hall Edward L | Ada, OK 74820-3321 | Oil & Gas Operator | Nov 2025 |
| 46 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 47 | Hall Exploration, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2025 |
| 48 | Hall Resources Corporation | Independence, MO 64057-2158 | Oil & Gas Operator | Jun 2016 |
| 49 | Hallco Petroleum Inc | Oklahoma City, OK 73106-5224 | Oil Operator | Aug 2018 |
| 50 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 51 | Hallmark Resources, Inc | Stilwell, OK 74960-0312 | Oil & Gas Operator | Sep 2020 |
| 52 | Hallum Construction Inc | Seminole, OK 74868-2427 | Oil & Gas Operator | Sep 2014 |
| 53 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 54 | Ham Oil Company, LLC | | Oil Operator | Sep 2022 |
| 55 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | Nov 2025 |
| 56 | Hamilton B J | Ada, OK 74820-9404 | Oil & Gas Operator | Sep 1999 |
| 57 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 58 | Hamilton K M Oil & Gas Co | Ada, OK 74820 | Oil Operator | Jan 2013 |
| 59 | Hamlin Jim | Dewey, OK 74029 | Oil & Gas Operator | Aug 1999 |
| 60 | Hammer Oil Properties Inc | Enid, OK 73706-0144 | Oil & Gas Operator | Oct 2017 |
| 61 | Hammer Ranch | Elmore City, OK 73433 | Oil & Gas Operator | Jan 2023 |
| 62 | Hammond Production Company | Bristow, OK 74010 | Oil & Gas Operator | Nov 1998 |
| 63 | Hamon Jake L | Dallas, TX 75201-3902 | Oil & Gas Operator | Nov 1997 |
| 64 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 65 | Hamp Oil | Ponca City, OK 74604 | Oil & Gas Operator | Sep 2002 |
| 66 | Hampton Corporation (The) | Norman, OK 73069-5910 | Oil Operator | Jun 2016 |
| 67 | Hancock Leon | Kingston, OK 73439-9618 | Oil Operator | Dec 2014 |
| 68 | Hanna Oil And Gas Company | Fort Smith, AR 72901 | Oil & Gas Operator | Oct 2025 |
| 69 | Hanoco Inc | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2025 |
| 70 | Hanover Operating Company | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1998 |
| 71 | Hansen Noel | Avant, OK 74001 | Oil Operator | Aug 2013 |
| 72 | Happy Hill Operating LLC | Guthrie, OK 73044-7361 | Oil & Gas Operator | Oct 2017 |
| 73 | Har Ken Oil Company | | Oil & Gas Operator | Dec 2021 |
| 74 | Harbert Energy Corp | Irving, TX 75015-2510 | Oil & Gas Operator | Feb 1993 |
| 75 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Dec 2025 |
| 76 | Hard Rock Operating LLC | | Oil & Gas Operator | May 2022 |
| 77 | Harden Operating Company Inc | Tulsa, OK 74106-2722 | Oil & Gas Operator | Sep 2006 |
| 78 | Hardin Productions | Okemah, OK 74859 | Oil & Gas Operator | Dec 2006 |
| 79 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Oct 2025 |
| 80 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Oct 2025 |
| 81 | Harding Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2016 |
| 82 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 83 | Hargraves Elston | Ponca City, OK 74604 | Oil & Gas Operator | Jul 2003 |
| 84 | Hargus Curtis | Macomb, OK 74852-8508 | Oil Operator | May 2017 |
| 85 | Hargus Irrevocable Trust | Tecumseh, OK 74873-0590 | Oil Operator | Apr 2014 |
| 86 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 87 | Harlow Corporation, The | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2014 |
| 88 | Harold Enterprises Inc | Kellyville, OK 74039-0441 | Oil & Gas Operator | Jan 2018 |
| 89 | Harold G Raper Family Trust | Mansfield, TX 76063-1667 | Oil Operator | May 2023 |
| 90 | Harold M Root Foundation | | Oil Operator | Oct 2025 |
| 91 | Harp Peggy A | Seminole, OK 74868-2284 | Oil & Gas Operator | Mar 2024 |
| 92 | Harper Joe Howard Dba J H Field Service | Nowata, OK 74048-9704 | Oil & Gas Operator | Sep 2025 |
| 93 | Harper, Michael | | Oil & Gas Operator | Aug 2011 |
| 94 | Harrell Petroleum Inc | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Oct 2017 |
| 95 | Harrell Verlan W | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Nov 1999 |
| 96 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 97 | Harrington Orville | Dewey, OK 74029 | Oil Operator | Oct 2025 |
| 98 | Harrington SR Tommy W | Drumright, OK 74030-5778 | Oil Operator | May 2015 |
| 99 | Harris B D | Norman, OK 73071-4802 | Oil & Gas Operator | Apr 2014 |
| 100 | Harris Mildred C | Tulsa, OK 74120 | Oil & Gas Operator | Sep 2025 |