| 7501 | DCB Oil & Gas, Inc. | Midland, TX 79707 | Oil & Gas Operator | Jan 1995 |
| 7502 | DCD Inc | Gillette, WY 82716 | Oil & Gas Operator | Aug 2003 |
| 7503 | DCDC, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2003 |
| 7504 | DCF Exploration | Lakewood, CO 80215 | Oil Operator | Dec 1989 |
| 7505 | Dci Petroleum Inc | University Heights, OH 44118-3818 | Oil & Gas Operator | Dec 2017 |
| 7506 | DCM Resources, LLC | Humble, TX 77346 | Oil Operator | Sep 2026 |
| 7507 | Dcor, L.L.C. | Dallas, TX 75248 | Oil & Gas Operator | Jul 2026 |
| 7508 | DCP Midstream, LLC | | Oil Operator | Jun 2016 |
| 7509 | DCP Midstream, LP | Denver, CO 80237 | Oil Operator | Nov 2006 |
| 7510 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Jun 2026 |
| 7511 | DCP Production Company LLC | Dill City, OK 73641 | Oil & Gas Operator | Jun 2026 |
| 7512 | DCP, Inc. | | Oil & Gas Operator | Jun 1990 |
| 7513 | DCS Energy | Throckmorton, TX 76483 | Oil Operator | Sep 2026 |
| 7514 | DDC & T Operating Company, Inc | | Oil & Gas Operator | Jul 2005 |
| 7515 | DDC Energy Corporation | Marietta, GA 30068 | Oil & Gas Operator | Mar 1997 |
| 7516 | DDC Oil LLC | Rockwall, TX 75087-5383 | Oil Operator | Mar 2020 |
| 7517 | DDC Production Company | Archer City, TX 76351 | Oil Operator | Sep 2026 |
| 7518 | DDC Track, LLC | Bushland, TX 79012 | Oil Operator | Sep 2026 |
| 7519 | DDD Exploration, Inc. | Amarillo, TX 79109 | Oil & Gas Operator | Sep 2026 |
| 7520 | De & TZ LLC | Wellsville, KS 66092 | Oil Operator | May 2026 |
| 7521 | De Central Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2026 |
| 7522 | De Compiegne Prop. Co. 20, The | Midland, TX 79702 | Oil Operator | Oct 2019 |
| 7523 | De IV Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 7524 | De Kalb Agric Assn Inc | Vernal, UT | Oil & Gas Operator | Jun 1965 |
| 7525 | De La Torre Oil & Gas, Inc | McAllen, TX 78501 | Oil & Gas Operator | Sep 2026 |
| 7526 | De Larios, R. V., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 7527 | De LTD Family Partnership | Punxsutawney, PA 15767-2646 | Oil & Gas Operator | Dec 2022 |
| 7528 | De Operating LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2017 |
| 7529 | De Soto Oil & Gas, Inc. | | Oil & Gas Operator | Mar 2006 |
| 7530 | De Soto Oil Properties, LLC | | Oil & Gas Operator | Jun 2026 |
| 7531 | De V Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2026 |
| 7532 | De-Vac Inc. | Daisetta, TX 77533 | Oil Operator | Sep 2026 |
| 7533 | De3 Operating LLC | Irving, TX 75038 | Oil & Gas Operator | Jun 2021 |
| 7534 | Deacon, Thomas J. | Randolph, NY 14772 | Gas Operator | Dec 2025 |
| 7535 | Dead Fern Resources Inc | Sperry, OK 74073 | Oil & Gas Operator | Jul 2026 |
| 7536 | Dead Horse Oil & Gas LLC | Skiatook, OK 74070-9343 | Oil & Gas Operator | Jun 2015 |
| 7537 | Deagen, Bill & Sons, LTD. | Stockdale, TX 78160 | Oil Operator | May 2018 |
| 7538 | Dean Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2019 |
| 7539 | Dean Enterprises, Inc. | | Oil & Gas Operator | Jun 2019 |
| 7540 | Dean Petroleum | | Oil & Gas Operator | Jun 2000 |
| 7541 | Dean'S Well Servicing Inc | Ratliff City, OK 73481 | Oil & Gas Operator | Jul 2026 |
| 7542 | Deanlake Operator, L.L.C. | Houston, TX 77010 | Oil & Gas Operator | Sep 2011 |
| 7543 | Dearing, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2021 |
| 7544 | Dearinger Compan | | Oil Operator | Dec 1994 |
| 7545 | Debbie Carroll | | Oil & Gas Operator | Apr 1999 |
| 7546 | Debeaux - Flores | | Oil & Gas Operator | Jan 2025 |
| 7547 | Deblin Oil & Gas, Inc | | Oil & Gas Operator | Aug 1995 |
| 7548 | Deblin Operating LTD | | Oil & Gas Operator | Jan 1997 |
| 7549 | Debord Oil Producers | Lincoln, NE 68503 | Oil Operator | Dec 1998 |
| 7550 | Debord Oil Producers Inc | | Oil Operator | Dec 2006 |
| 7551 | Deca Energy Corporation | | Oil & Gas Operator | Aug 1986 |
| 7552 | Decab Company | Victoria, KS 67671 | Oil Operator | Aug 1996 |
| 7553 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 7554 | Dechant Oil Operations, LLC | Hutchinson, KS 67501 | Oil Operator | Apr 2026 |
| 7555 | Deck Exploration Inc | Perry, OK 73077-0303 | Oil & Gas Operator | May 2013 |
| 7556 | Deck Oil Company | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2020 |
| 7557 | Decker & Associates | | Oil & Gas Operator | Mar 1991 |
| 7558 | Decker Lease Ope | | Oil Operator | Dec 1988 |
| 7559 | Decker Operating Co., L.L.C. | Houston, TX 77008 | Oil & Gas Operator | Sep 2026 |
| 7560 | Decker Petroleum | | Oil & Gas Operator | Oct 2002 |
| 7561 | Decker Well Service LLC | Fleming, OH 45729 | Oil & Gas Operator | Dec 2017 |
| 7562 | Decker, James K. & Tiffany J. | Jamestown, NY 14701 | Oil & Gas Operator | Dec 2025 |
| 7563 | Declar Oil & Gas Inc | | Oil & Gas Operator | Dec 2012 |
| 7564 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 7565 | Deco | Kilgore, TX 75662 | Oil & Gas Operator | Jan 1999 |
| 7566 | Deco Oil Co. | | Oil Operator | Oct 2013 |
| 7567 | Dedica Energy Corporation | Mattoon, IL 61938 | Oil & Gas Operator | Mar 2008 |
| 7568 | Dee'S Oil | Wellington, TX 79095 | Oil & Gas Operator | Mar 2008 |
| 7569 | Dee-Jay Exploration Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2026 |
| 7570 | Deem, J. F. Oil & Gas, LLC | Parkersburg, WV 26104 | Oil & Gas Operator | Dec 2021 |
| 7571 | Deem, W. A. | Harrisville, WV 263627878 | Oil & Gas Operator | Dec 2001 |
| 7572 | Deen Drilling Company | Archer City, TX 76351 | Oil & Gas Operator | Sep 2026 |
| 7573 | Deep Creek Adventures, Co. | | Oil Operator | Dec 2018 |
| 7574 | Deep Ford Gas Company | | Gas Operator | Dec 2021 |
| 7575 | Deep Gully Oil LLC | Houston, TX 77292 | Oil Operator | Sep 2026 |
| 7576 | Deep Hole Oil LLC | Ashland, KY 41105 | Oil & Gas Operator | Dec 2020 |
| 7577 | Deep Reef Industries | Amarillo, TX 79101 | Oil & Gas Operator | Jan 2004 |
| 7578 | Deep Resources LLC | Holmesville, OH 44633 | Oil & Gas Operator | Dec 2025 |
| 7579 | Deep River Energy LLC | | Oil Operator | Jun 2026 |
| 7580 | Deep Rock LLC | Tulsa, OK 74137-1612 | Gas Operator | Jun 2022 |
| 7581 | Deep Rock Resources, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2026 |
| 7582 | Deep South Production | | Oil Operator | Dec 2023 |
| 7583 | Deeprock Disposal Services, LLC | | Oil & Gas Operator | Sep 1991 |
| 7584 | Deepwell Co | | Oil Operator | Jul 1989 |
| 7585 | Deer Creek Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2019 |
| 7586 | Deer Creek Oil & Gas | Atlanta, GA 30326-1000 | Gas Operator | Dec 1987 |
| 7587 | Deer Oil & Gas | Marietta, OH 45750 | Oil & Gas Operator | Dec 2025 |
| 7588 | Deer Run Oil & Gas LLC | Albion, PA 16401-8306 | Gas Operator | Dec 2025 |
| 7589 | Deer Run Oil Lease, LLC | Caney, KS 67333 | Oil Operator | May 2026 |
| 7590 | Dees Production LLC | | Oil Operator | Dec 2024 |
| 7591 | Defranco Oil Account | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2004 |
| 7592 | Deg Energy, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Feb 2007 |
| 7593 | Degaugh Well Service Inc | | Oil Operator | Jul 1989 |
| 7594 | Degge Oil Field Service | Okemah, OK 74859-0269 | Oil Operator | Nov 2014 |
| 7595 | Degge Oilfield Services LLC | Okemah, OK 74859 | Oil Operator | May 2026 |
| 7596 | Degroot, Garry | South Dayton, NY 14138 | Gas Operator | Dec 2025 |
| 7597 | Deguello Operating LLC | College Sta, TX 77840 | Oil & Gas Operator | Sep 2026 |
| 7598 | Dehart Company (The) | Ardmore, OK 73402 | Oil & Gas Operator | Jul 2026 |
| 7599 | Deisenroth M Craig | Tulsa, OK 74104-6511 | Oil & Gas Operator | Jul 2026 |
| 7600 | Deitz Edith | Clarion, PA 16214-9416 | Oil & Gas Operator | Dec 2009 |