| 7501 | Dean Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2019 |
| 7502 | Dean Enterprises, Inc. | | Oil & Gas Operator | Jun 2019 |
| 7503 | Dean Petroleum | | Oil & Gas Operator | Jun 2000 |
| 7504 | Dean'S Well Servicing Inc | Ratliff City, OK 73481 | Oil & Gas Operator | Mar 2026 |
| 7505 | Deanlake Operator, L.L.C. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 7506 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 7507 | Dearinger Compan | | Oil Operator | Dec 1994 |
| 7508 | Debbie Carroll | | Oil & Gas Operator | Apr 1999 |
| 7509 | Debeaux - Flores | | Oil & Gas Operator | Jan 2025 |
| 7510 | Deblin Oil & Gas, Inc | | Oil & Gas Operator | Aug 1995 |
| 7511 | Deblin Operating LTD | | Oil & Gas Operator | Jan 1997 |
| 7512 | Debord Oil Producers | Lincoln, NE 68503 | Oil Operator | Dec 1998 |
| 7513 | Debord Oil Producers Inc | | Oil Operator | Dec 2006 |
| 7514 | Deca Energy Corporation | | Oil & Gas Operator | Aug 1986 |
| 7515 | Decab Company | Victoria, KS 67671 | Oil Operator | Aug 1996 |
| 7516 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 7517 | Dechant Oil Operations, LLC | Hutchinson, KS 67501 | Oil Operator | Dec 2025 |
| 7518 | Deck Exploration Inc | Perry, OK 73077-0303 | Oil & Gas Operator | May 2013 |
| 7519 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 7520 | Decker & Associates | | Oil & Gas Operator | Mar 1991 |
| 7521 | Decker Lease Ope | | Oil Operator | Dec 1988 |
| 7522 | Decker Operating Co., L.L.C. | Houston, TX 77008 | Oil & Gas Operator | Jun 2026 |
| 7523 | Decker Petroleum | | Oil & Gas Operator | Oct 2002 |
| 7524 | Decker Well Service LLC | Fleming, OH 45729 | Oil & Gas Operator | Dec 2017 |
| 7525 | Decker, James K. & Tiffany J. | Jamestown, NY 14701 | Oil & Gas Operator | Dec 2024 |
| 7526 | Declar Oil & Gas Inc | | Oil & Gas Operator | Dec 2012 |
| 7527 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 7528 | Deco | Kilgore, TX 75662 | Oil & Gas Operator | Jan 1999 |
| 7529 | Deco Oil Co. | | Oil Operator | Oct 2013 |
| 7530 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 7531 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2026 |
| 7532 | Deem, J. F. Oil & Gas, LLC | Parkersburg, WV 26104 | Oil & Gas Operator | Dec 2021 |
| 7533 | Deem, W. A. | Harrisville, WV 26362-7878 | Oil & Gas Operator | Dec 2001 |
| 7534 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | Jun 2026 |
| 7535 | Deep Creek Adventures, Co. | | Oil Operator | Dec 2018 |
| 7536 | Deep Ford Gas Company | Charleston, WV 25321-0169 | Gas Operator | Dec 2021 |
| 7537 | Deep Gully Oil LLC | Houston, TX 77292 | Oil Operator | Jun 2026 |
| 7538 | Deep Hole Oil LLC | Ashland, KY 41105 | Oil & Gas Operator | Dec 2020 |
| 7539 | Deep Reef Industries | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2004 |
| 7540 | Deep Resources LLC | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2025 |
| 7541 | Deep River Energy LLC | | Oil Operator | Dec 2025 |
| 7542 | Deep Rock LLC | Tulsa, OK 74137-1612 | Gas Operator | Jun 2022 |
| 7543 | Deep Rock Resources, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2026 |
| 7544 | Deep South Production | | Oil Operator | Dec 2023 |
| 7545 | Deeprock Disposal Services, LLC | | Oil & Gas Operator | Sep 1991 |
| 7546 | Deepwell Co | | Oil Operator | Jul 1989 |
| 7547 | Deer Creek Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2019 |
| 7548 | Deer Creek Oil & Gas | Atlanta, GA 30326-1000 | Gas Operator | Dec 1987 |
| 7549 | Deer Oil & Gas | Marietta, OH 45750 | Oil & Gas Operator | Dec 2025 |
| 7550 | Deer Run Oil & Gas LLC | Albion, PA 16401-8306 | Gas Operator | Dec 2025 |
| 7551 | Deer Run Oil Lease, LLC | Caney, KS 67333 | Oil Operator | Feb 2026 |
| 7552 | Dees Production LLC | | Oil Operator | Dec 2024 |
| 7553 | Defranco Oil Account | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2004 |
| 7554 | Deg Energy, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Feb 2007 |
| 7555 | Degaugh Well Service Inc | | Oil Operator | Jul 1989 |
| 7556 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 7557 | Degge Oilfield Services LLC | Okemah, OK 74859 | Oil Operator | Mar 2026 |
| 7558 | Degroot, Garry | South Dayton, NY 14138 | Gas Operator | Dec 2024 |
| 7559 | Deguello Operating LLC | College Sta, TX 77840 | Oil & Gas Operator | Jun 2026 |
| 7560 | Dehart Company (The) | Ardmore, OK 73402 | Oil & Gas Operator | Apr 2026 |
| 7561 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Mar 2026 |
| 7562 | Deitz Edith | Clarion, PA 16214-9416 | Oil & Gas Operator | Dec 2009 |
| 7563 | Deitz Gas & Oil Inc | Clarion, PA 16214-3215 | Oil & Gas Operator | Dec 2024 |
| 7564 | Dejong John B | | Oil Operator | Dec 2025 |
| 7565 | Deka Exploration Inc | Oklahoma City, OK 73113-0057 | Oil & Gas Operator | Nov 2019 |
| 7566 | Dekalb Energy Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 1996 |
| 7567 | Dekasco, Inc. | | Oil & Gas Operator | May 1990 |
| 7568 | Del Amo Energy Co. | | Oil & Gas Operator | Dec 1987 |
| 7569 | Del Energy, Inc | | Oil Operator | Dec 2014 |
| 7570 | Del Mar | Holliday, TX 76366 | Oil & Gas Operator | Jun 2026 |
| 7571 | Del Mar Energy, Inc. | Van Alstyne, TX 75495 | Oil & Gas Operator | Jun 2026 |
| 7572 | Del Mar Exploration Company | Houston, TX 77006 | Oil & Gas Operator | Jan 2014 |
| 7573 | Del Oil & Gas Corp | | Oil Operator | Jul 1981 |
| 7574 | Del Petroleum Corporation | Dallas, TX 75219 | Oil & Gas Operator | Jan 2012 |
| 7575 | Del Rio Production Co. | Gainesville, TX 76240 | Oil Operator | Mar 2019 |
| 7576 | Del-Rio Resources Inc | Vernal, UT 84079 | Oil & Gas Operator | Jan 2018 |
| 7577 | Delaware Davis Petroleum Corp. | Houston, TX 77056 | Oil & Gas Operator | Jan 2000 |
| 7578 | Delaware Dyche Corp. | Hutchinson, KS 67501 | Oil Operator | Jan 2010 |
| 7579 | Delaware Ecco Petroleum Inc. | Rockwall, TX 75087 | Oil & Gas Operator | Jul 2001 |
| 7580 | Delbert A. Dodson | | Oil Operator | Aug 2002 |
| 7581 | Delcar, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 1995 |
| 7582 | Delco Operating Company LP | Houston, TX 77056 | Oil & Gas Operator | May 2020 |
| 7583 | Delek Energy Systems Us, Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2011 |
| 7584 | Delfin Operating, LLC | Dallas, TX 75243 | Oil & Gas Operator | Jun 2026 |
| 7585 | Delgado, Emil A | San Antonio, TX 78223 | Oil & Gas Operator | Sep 2016 |
| 7586 | Delhi Gas Pipeli | | Gas Operator | Aug 1998 |
| 7587 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 7588 | Delhi Pipeline | | Oil & Gas Operator | Sep 1999 |
| 7589 | Delhi-Taylor Oil Corp | | Oil & Gas Operator | Dec 1974 |
| 7590 | Delhi-Trading LLC | Durango, CO 81301 | Oil & Gas Operator | Apr 2026 |
| 7591 | Dell Charles E | Cleveland, OK 74020-0090 | Oil & Gas Operator | Feb 2015 |
| 7592 | Dell-Ray Investments, Inc. | Nickerson, KS 67561 | Oil Operator | Dec 2019 |
| 7593 | Delmar Operating, Inc. | Houston, TX 77010 | Oil & Gas Operator | Oct 1996 |
| 7594 | Delone, M S | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2025 |
| 7595 | Delong Oil & Gas Services, Inc. | Cushing, OK 74023 | Oil & Gas Operator | Mar 2026 |
| 7596 | Delong Ralph J | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2005 |
| 7597 | Delong, Horace | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 7598 | Delong, Ralph S | | Oil & Gas Operator | Jun 2025 |
| 7599 | Delozier, Orval & Stevens, Floyd, A General Partnership | Dewey, OK 74029 | Oil Operator | Nov 2009 |
| 7600 | Delphi International, Inc. | Tulsa, OK 74104 | Oil Operator | Mar 2026 |