| 401 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 402 | Henderson & Erickson, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 403 | Hep Oil Company, LTD. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 404 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 405 | Herring, Ray | Graham, TX 76450 | Oil & Gas Operator | Jul 2014 |
| 406 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | Feb 2026 |
| 407 | Heydrick Petroleum Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 408 | Hez Petroleum Company | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 409 | Hickman & Ickert | Olney, TX 76374 | Oil & Gas Operator | Feb 2002 |
| 410 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 411 | Hill, Hub, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jan 1994 |
| 412 | Hill, R.M. Operating Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 413 | Hill, T. R. | Graham, TX 76450 | Oil & Gas Operator | Apr 1995 |
| 414 | Hilltex Operating Company, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 415 | Hines, Ralph, Jr. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2002 |
| 416 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Dec 2025 |
| 417 | Holli-Tex Supply Co. | Holliday, TX 76366 | Oil & Gas Operator | May 2018 |
| 418 | Hood, J. Frank, Jr. | Arlington, TX 76006 | Oil & Gas Operator | Feb 2026 |
| 419 | Horany, Ray & Ernest | Olney, TX 76374 | Oil & Gas Operator | May 2002 |
| 420 | Horn, W. J. | Graham, TX 76450 | Oil & Gas Operator | Oct 2004 |
| 421 | Horseshoe Production, LLC | Bryson, TX 76427 | Oil & Gas Operator | Feb 2026 |
| 422 | HPC Operating, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Mar 2008 |
| 423 | Hughes, Bill Drilling, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 424 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 425 | Hulsey Oil Company | Dallas, TX 75205 | Oil & Gas Operator | Aug 1999 |
| 426 | Hunter & McDonald | Wichita Falls, TX 76309 | Oil & Gas Operator | Jul 2001 |
| 427 | Hunter Brothers | Wichita Falls, TX 76302 | Oil & Gas Operator | Jul 2007 |
| 428 | HW Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 429 | I & L Development Co. | Dallas, TX 75219 | Oil & Gas Operator | Mar 1996 |
| 430 | Ickert Enterprises | Olney, TX 76374 | Oil & Gas Operator | Feb 2026 |
| 431 | Ingram, J. Oil & Gas, Inc. | Plano, TX 75074 | Oil & Gas Operator | Feb 2026 |
| 432 | International Oil&Gas Consultant | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 433 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Feb 2026 |
| 434 | Ipr Energy Partners, L.P. | Bowie, TX 76230 | Oil & Gas Operator | Aug 2014 |
| 435 | Itx Corporation | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 436 | J & A Oil Properties | Olney, TX 76374 | Oil & Gas Operator | Aug 2018 |
| 437 | J & D Services | Graham, TX 76450 | Oil Operator | Feb 2017 |
| 438 | J & F Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Feb 2026 |
| 439 | J & J Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Mar 2015 |
| 440 | J & J Oil Company LLC | Lubbock, TX 79424 | Oil Operator | Feb 2026 |
| 441 | J & K Production LLC | Konawa, OK 74849 | Oil Operator | Oct 2025 |
| 442 | J & S Oil Company | Graham, TX 76450 | Oil & Gas Operator | Apr 2022 |
| 443 | J B J Oil Properties, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 444 | J Ranger Oil & Gas, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 445 | J-Lyn Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 446 | J. K. J. Company | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 447 | J.J. Energy Company | Richardson, TX 75081 | Oil & Gas Operator | Feb 2026 |
| 448 | Jackson, D. L., & Son | Jacksboro, TX 76458 | Oil & Gas Operator | May 2001 |
| 449 | Jaid Energy, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 450 | Jay Management Company, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 451 | JB Production LLC | Benbrook, TX 76126 | Oil Operator | Jun 2024 |
| 452 | JDL Operating, LLC | Holliday, TX 76366 | Oil & Gas Operator | Feb 2026 |
| 453 | Jeff Dooley Operating, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 454 | Jerry Barnett & Son | Graham, TX 76450 | Oil Operator | Sep 2024 |
| 455 | Jil Oil Corp. | San Antonio, TX 78279 | Oil & Gas Operator | Feb 2026 |
| 456 | Jim Production | Jacksboro, TX 76458 | Oil & Gas Operator | Jan 2010 |
| 457 | JJB Operating Co. | Mineral Wells, TX 76068 | Oil & Gas Operator | Feb 2026 |
| 458 | Jjes, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 459 | JKW Energy Division | Abilene, TX 79608 | Oil & Gas Operator | Aug 2010 |
| 460 | JL&M Energy, LLC | Wichita Falls, TX 76308 | Oil Operator | Feb 2026 |
| 461 | JLR Energy | Olney, TX 76374 | Oil & Gas Operator | Dec 2003 |
| 462 | JMC Resources Corp. | Houston, TX 77077 | Oil & Gas Operator | Feb 2026 |
| 463 | JMH Production, LLC | Archer City, TX 76351 | Oil & Gas Operator | Feb 2026 |
| 464 | Johnson, William D. | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2008 |
| 465 | Joint Resources Company | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 466 | Jojon Petroleum Company | Dallas, TX 75219 | Oil & Gas Operator | Oct 2025 |
| 467 | JTL Oil Company LLC | Wichita Falls, TX 76305 | Oil & Gas Operator | Feb 2026 |
| 468 | Just Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 469 | K & F Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Dec 2021 |
| 470 | K R Well Technology, LLC | Dimmitt, TX 79027 | Oil Operator | Feb 2026 |
| 471 | K&C Pump Truck, LLC | Graham, TX 76450 | Oil & Gas Operator | Dec 2018 |
| 472 | Kadane Corporation | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 473 | Kalda Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1994 |
| 474 | Karper Company, The | Graham, TX 76450 | Oil & Gas Operator | Feb 2003 |
| 475 | Karper Oil & Gas Corporation | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 476 | Karst Incorporated | Fort Worth, TX 76116 | Oil Operator | Feb 2026 |
| 477 | Kas Productions | La Veta, CO 81055 | Oil Operator | Mar 2008 |
| 478 | KCR Energy, L.L.C. | Fate, TX 75132 | Oil Operator | Feb 2026 |
| 479 | Keating Energy, Inc. | FT Washington, PA 19034 | Oil & Gas Operator | Feb 2026 |
| 480 | Kelly Mahler Operating, LLC | Graham, TX 76450 | Oil Operator | Feb 2026 |
| 481 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Feb 2026 |
| 482 | Kendrick, Paul W. | Baytown, TX 77520 | Oil & Gas Operator | Sep 2005 |
| 483 | Killion Well Service Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2014 |
| 484 | Kimberlin & Huitt | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 1998 |
| 485 | Kimleco Petroleum, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2026 |
| 486 | Knight, Reuben B. | Windthorst, TX 76389 | Oil & Gas Operator | Feb 2026 |
| 487 | Knobloch, Albert | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 488 | Knox, D. M., Oil Co. | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2000 |
| 489 | Knox, H. A. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 490 | Ko Operating | Merkel, TX 79536 | Oil & Gas Operator | Feb 2026 |
| 491 | Kocana Resources | Ranchos Taos, NM 87557 | Oil & Gas Operator | Jul 1999 |
| 492 | Kornye-Tillman Company | Cleburne, TX 76031 | Oil & Gas Operator | Feb 2026 |
| 493 | Kramer Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 494 | Kramer, Frank & Ethel FLP | Graham, TX 76450 | Oil & Gas Operator | Sep 2014 |
| 495 | Kramer, Frank C. | Graham, TX 76450 | Oil & Gas Operator | Apr 2004 |
| 496 | Kroh Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 497 | Krot Oil Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 498 | KTC Oil Enterprises, LLC | Dallas, TX 75247 | Oil & Gas Operator | Feb 2026 |
| 499 | L & R Energy Corporation | Spearman, TX 79081 | Oil & Gas Operator | Nov 2014 |
| 500 | L-R Production | Olney, TX 76374 | Oil & Gas Operator | Feb 2026 |