| 401 | Rathpro Inc | Douglas, WY 82633 | Oil & Gas Operator | Feb 1994 |
| 402 | Ratliff City Trucking Inc | Ratliff City, OK 73481-9603 | Oil & Gas Operator | Feb 2018 |
| 403 | Ratliff Operating Corp. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2025 |
| 404 | Rattler Midstream Operating LLC | Midland, TX 79701 | Oil Operator | Sep 2025 |
| 405 | Rattlesnake Mountain Oil LLC | Boulder City, NV 89005 | Oil & Gas Operator | Sep 2025 |
| 406 | Rattlesnake Operating Co, LLC | Plntersville, TX 77363 | Oil & Gas Operator | Sep 2025 |
| 407 | Ratts, Robert V. Inc. | Bedford, TX 76021 | Oil & Gas Operator | Aug 2003 |
| 408 | Ratzlaff, Steven | Galva, KS 67443 | Oil Operator | Dec 1996 |
| 409 | Rauch, Shaw & Laird, Inc. | | Oil & Gas Operator | Mar 1995 |
| 410 | Rauch-Shaw Assoc. Inc. & Laird | | Oil & Gas Operator | Mar 1991 |
| 411 | Raven Forest Operating, LLC | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Sep 2025 |
| 412 | Raven Operating Group, Inc. | Sedalia, CO 80135 | Oil & Gas Operator | Dec 2010 |
| 413 | Raven Resources LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | May 2025 |
| 414 | Raven Ridge Energy, LLC | Charleston, WV 25302 | Oil & Gas Operator | Dec 2021 |
| 415 | Ravenna Oil Co | Beattyville, KY 41311 | Oil Operator | Dec 2023 |
| 416 | Ravil Inc | Edmond, OK 73013 | Gas Operator | Nov 1998 |
| 417 | Raw Crude Oil & Gas, L.L.C. | Norman, OK 73069 | Oil & Gas Operator | Jun 2025 |
| 418 | Raw Energy Corporation Of Kansas | Weatherford, TX 76086 | Gas Operator | Dec 2019 |
| 419 | Raw Oil & Gas, Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Sep 2025 |
| 420 | Raw Production | Kermit, TX 79745 | Oil & Gas Operator | Sep 2025 |
| 421 | Raw Production LLC | Lindsay, OK 73052 | Oil & Gas Operator | May 2025 |
| 422 | Rawhide Oil Company | | Oil & Gas Operator | Sep 2011 |
| 423 | Rawhide Operating, Inc. | New Braunfels, TX 78131 | Oil & Gas Operator | Sep 2025 |
| 424 | Rawlins Operating Company, LLC | Elkhart, TX 75839 | Oil & Gas Operator | Sep 2025 |
| 425 | Rawls Oil Services | Andrews, TX 79714 | Oil Operator | Sep 2025 |
| 426 | Ray - A Operating Inc. | Albany, TX 76430 | Oil Operator | Sep 2025 |
| 427 | Ray A Pierce | Midland, TX 79702 | Oil & Gas Operator | Dec 2023 |
| 428 | Ray Conner | | Oil & Gas Operator | Apr 2002 |
| 429 | Ray Energy, LLC | | Oil Operator | Jan 2025 |
| 430 | Ray Estis | | Oil Operator | Dec 2024 |
| 431 | Ray G H Oil Company | Chickasha, OK 73023-0650 | Oil Operator | Feb 2010 |
| 432 | Ray Herman | Haskell, OK 74436-0446 | Oil & Gas Operator | Dec 2021 |
| 433 | Ray Herring Estate | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 434 | Ray Herring Operating Co., LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 435 | Ray Jr. Co., Inc. | Pleasanton, TX 78064 | Oil & Gas Operator | Sep 2025 |
| 436 | Ray Loveless Enterprises, L.L.C. | Kilgore, TX 75663 | Oil Operator | Sep 2025 |
| 437 | Ray Oil Company | Dallas, TX 75370 | Oil Operator | Dec 1989 |
| 438 | Ray Pander Trucking Inc | Bolivar, OH 44612 | Oil & Gas Operator | Dec 1998 |
| 439 | Ray Randy S | Okmulgee, OK 74447-8534 | Oil & Gas Operator | Apr 2015 |
| 440 | Ray Roger T | Boynton, OK 74422 | Oil & Gas Operator | Dec 2021 |
| 441 | Ray Westall | Loco Hills, NM 88255 | Oil & Gas Operator | Sep 2012 |
| 442 | Ray Westall Operating, Inc. | Loco Hills, NM 88255 | Oil & Gas Operator | Jun 2025 |
| 443 | Ray'S Oil Company | Boynton, OK 74422 | Oil & Gas Operator | May 2025 |
| 444 | Raya Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Jul 2018 |
| 445 | Rayalto Oil & Gas, Inc. | MC Queeney, TX 78123 | Oil & Gas Operator | Mar 2004 |
| 446 | Raybaw Operating, LLC | Dallas, TX 75204 | Oil & Gas Operator | Jul 2025 |
| 447 | Raybo, Inc. | | Oil Operator | Dec 1990 |
| 448 | Rayburn Oil Co Inc | | Oil & Gas Operator | Dec 2024 |
| 449 | Rayco Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2025 |
| 450 | Rayden | Midland, TX 79711 | Oil & Gas Operator | Sep 2025 |
| 451 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Sep 2025 |
| 452 | Raydon Production Company | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 1992 |
| 453 | Raye Oil Company | Velma, OK 73491-0482 | Oil & Gas Operator | Oct 2012 |
| 454 | Rayford Exploration | | Oil Operator | Feb 1984 |
| 455 | Raygary Oil Co. | Havana, KS 67347 | Oil Operator | May 2002 |
| 456 | Raygary Oil Comp | | Oil Operator | Sep 1991 |
| 457 | Rayland Operating LLC | Moro, IL 62067 | Oil Operator | Jun 2023 |
| 458 | Raylee Operating Company | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 459 | Raymond Oil Co I | | Gas Operator | Sep 1993 |
| 460 | Raymond Oil Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | Apr 2025 |
| 461 | Raymond Oil Comp | | Oil & Gas Operator | Dec 1996 |
| 462 | Raymond'S Operating, Inc. | Kamay, TX 76369 | Oil & Gas Operator | Sep 2025 |
| 463 | Raymond, WM. C. | Rockdale, TX 76567 | Oil & Gas Operator | Sep 2025 |
| 464 | Rayville Resources, Inc. | | Oil & Gas Operator | Aug 1991 |
| 465 | Razar Resources | | Oil & Gas Operator | Dec 2000 |
| 466 | Razook Oil Compa | | Oil Operator | Aug 1990 |
| 467 | Razorback Explor | | Gas Operator | Dec 1992 |
| 468 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 469 | RBC Exploration Company | Tulsa, OK 74114 | Oil & Gas Operator | May 2013 |
| 470 | RBD-Shelby Agency | Dallas, TX 75283 | Oil & Gas Operator | Dec 1993 |
| 471 | Rbi, Inc. | | Oil Operator | Dec 1984 |
| 472 | RBJ & Associates, LP | Midland, TX 79707 | Oil Operator | Jan 2020 |
| 473 | RBM Oil LLC | Hillsboro, KS 67063 | Oil Operator | Apr 2025 |
| 474 | RBR Oil And Gas Company | Pampa, TX 79066 | Oil & Gas Operator | Dec 2001 |
| 475 | RBR Operating, Inc. | Luling, TX 78648 | Oil & Gas Operator | Sep 2025 |
| 476 | RBT Oil Group, LLC | Houston, TX 77043 | Oil Operator | Sep 2025 |
| 477 | RC Resources Corp | Dallas, TX 75231 | Oil & Gas Operator | Oct 2009 |
| 478 | RC Southwell Oil LLC | Warren, PA 16365 | Oil & Gas Operator | Dec 2024 |
| 479 | Rci, L.L.C. | Abilene, TX 79606 | Oil & Gas Operator | Sep 2025 |
| 480 | RCK Oil And Gas LLC | Denton, TX 76207 | Oil & Gas Operator | Jun 2025 |
| 481 | RCM Engineering, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2003 |
| 482 | RCR Drilling & P | | Oil & Gas Operator | Apr 1992 |
| 483 | RCS Drilling Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 1994 |
| 484 | RCS Oil | | Oil Operator | Apr 2025 |
| 485 | RCV Investments, LLC | | Oil & Gas Operator | Jan 2025 |
| 486 | RCW Oil Company | Forsan, TX 79733 | Oil & Gas Operator | Mar 2019 |
| 487 | RCW Oil, LLC | Forsan, TX 79733 | Oil & Gas Operator | Sep 2025 |
| 488 | Rcy Mineral Group, Inc. | El Campo, TX 77437 | Oil Operator | Jul 2010 |
| 489 | RDG Oil & Gas LLC | Post Falls, ID 82854 | Oil & Gas Operator | Mar 2017 |
| 490 | RDH Enterprises, Inc. | El Reno, OK 73036 | Oil & Gas Operator | May 2015 |
| 491 | RDT Properties, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2012 |
| 492 | Re Fox & Assoc Inc | Pittsburgh, PA 15243-0130 | Gas Operator | Dec 1999 |
| 493 | Re Gas Dev LLC | State College, PA 16801-7085 | Oil & Gas Operator | Sep 2018 |
| 494 | Re-Op Corp. | Houston, TX 77274 | Oil & Gas Operator | Sep 2025 |
| 495 | Reabold California LLC | | Oil & Gas Operator | Jun 2025 |
| 496 | Reach Group-Reac | | Oil & Gas Operator | Apr 1995 |
| 497 | Reach Oil | Brownwood, TX 76801 | Oil & Gas Operator | Sep 2025 |
| 498 | Reach Oil And Gas Company Inc | Oklahoma City, OK 73118-1100 | Oil & Gas Operator | May 2025 |
| 499 | Reach Petroleum | | Oil & Gas Operator | Jan 1994 |
| 500 | Reach Petroleum Corporation | Wichita, KS 67218 | Oil & Gas Operator | Dec 2009 |