| 501 | Gibraltar Energy Co., Inc. & Richard H. Mason | | Gas Operator | Aug 1995 |
| 502 | Gibraltar Energy Company, Inc. | | Oil & Gas Operator | Jul 2025 |
| 503 | Gibraltar Energy LLC | | Oil Operator | Aug 2025 |
| 504 | Gibraltar Petroleum Corporation | Mabank, TX 75147 | Oil & Gas Operator | Nov 2008 |
| 505 | Gibraltar Resources, Inc. | Dallas, TX 75374 | Oil & Gas Operator | Jul 1993 |
| 506 | Gibson C O | Boynton, OK 74422 | Oil Operator | May 2021 |
| 507 | Gibson H F Estate | Dallas, TX 75250 | Oil & Gas Operator | Jul 1995 |
| 508 | Gibson J W | | Oil & Gas Operator | Sep 1999 |
| 509 | Gibson Les | Welty, OK 74833 | Oil & Gas Operator | Jul 2025 |
| 510 | Gibson Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | May 1997 |
| 511 | Gideon Oil Operations | | Oil Operator | Jun 2025 |
| 512 | Gideon Operating | Coleman, TX 76834 | Oil & Gas Operator | Oct 2025 |
| 513 | Gidoen Oil Company | Brookesmith, TX 76827 | Oil Operator | Oct 2025 |
| 514 | Giebel Petroleum LTD. | Midland, TX 79705 | Oil & Gas Operator | Jul 2019 |
| 515 | Giebler Oil Comp | | Oil Operator | Aug 1991 |
| 516 | Gier'S Farm Service, Inc. | Cherry Creek, NY 14723 | Gas Operator | Dec 2024 |
| 517 | Gierhart Exploration, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 1994 |
| 518 | Gifford Operating Company | Dallas, TX 75206 | Oil & Gas Operator | Jul 2003 |
| 519 | Gil-John Oil Co. | Alamogordo, NM 88310 | Oil & Gas Operator | Jan 2009 |
| 520 | Gilbert Bates | Midland, TX 79708 | Gas Operator | Jan 2010 |
| 521 | Gilbert Exploration Company Inc | Charleston, WV 25301 | Oil & Gas Operator | Dec 2023 |
| 522 | Gilbert Oil Co | Ravenna, OH 44266 | Oil & Gas Operator | Dec 1988 |
| 523 | Gilbert Oil Properties | Tulsa, OK 74105-3741 | Oil Operator | Jun 2025 |
| 524 | Gilbert Ralph | Coweta, OK 74429 | Oil Operator | Apr 2007 |
| 525 | Gilbert, A. A. | Shreveport, LA 71133 | Oil & Gas Operator | Mar 1997 |
| 526 | Gilbert, Edward L. | Rushford, NY 14777 | Gas Operator | Dec 2024 |
| 527 | Gilbert,A.A.TX Acct/Partnership | Shreveport, LA 71133 | Oil Operator | Oct 2025 |
| 528 | Gilbert-Stewart Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 529 | Gilbreath Tank Trucks, Inc. | Whitesboro, TX 76273 | Oil Operator | Oct 2025 |
| 530 | Gilby Services LLC | Velma, OK 73491 | Oil & Gas Operator | Jun 2025 |
| 531 | Gilco Gas, Inc. | | Gas Operator | Dec 2008 |
| 532 | Gilco Oil Inc | Ada, OK 74820 | Oil & Gas Operator | May 2019 |
| 533 | Gildemeister, Carlos & Theresa | Rushford, NY 14777 | Gas Operator | Dec 2024 |
| 534 | Giles, Benjamin M. | Towanda, KS 67144 | Oil & Gas Operator | Oct 2016 |
| 535 | Gill Jet C Dba Jetco Inc | Okmulgee, OK 74447 | Oil & Gas Operator | Dec 2023 |
| 536 | Gill Oil Company, LP | White Oak, TX 75693 | Oil Operator | Oct 2025 |
| 537 | Gill Ranch Storage LLC | | Oil & Gas Operator | Jul 2025 |
| 538 | Gill-Mac Inc | Nowata, OK 74048 | Oil & Gas Operator | May 1993 |
| 539 | Gillam Chuck Oil | | Oil Operator | Sep 1993 |
| 540 | Gillespie Oil Inc | Midland, TX 79701 | Oil & Gas Operator | Feb 2001 |
| 541 | Gillespie Operating LLC | Abilene, TX 79608 | Oil & Gas Operator | Oct 2025 |
| 542 | Gillespie Well Service Co Inc | | Oil Operator | Apr 1981 |
| 543 | Gillham Oil & Gas Inc | Shawnee, OK 74801-3547 | Oil Operator | May 1997 |
| 544 | Gillham Paul | Maud, OK 74854 | Oil & Gas Operator | Apr 2023 |
| 545 | Gilliam Petroleum, LTD | | Oil & Gas Operator | Mar 2013 |
| 546 | Gilliam'S Aghorn Energy | Odessa, TX 79768 | Oil & Gas Operator | May 1997 |
| 547 | Gilliam, Frank | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 548 | Gilliland Gerald D | Dewey, OK 74029-1639 | Oil Operator | Mar 2015 |
| 549 | Gilliland Oil And Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 550 | Gilliland Robert E Estate Of | Dewey, OK 74029-3924 | Oil & Gas Operator | Jul 2001 |
| 551 | Gilliland, Anthony L. | Edwardsville, KS 66111 | Oil Operator | Jun 2025 |
| 552 | Gillispie, Inc. | Amarillo, TX 79159 | Gas Operator | Oct 2025 |
| 553 | Gillman, John | Independence, KS 67301 | Oil Operator | Sep 2007 |
| 554 | Gillring Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 1994 |
| 555 | Gilmore Oil & Gas | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 556 | Gilmore Oil And Gas Co | Austin, TX 78768-4729 | Oil & Gas Operator | Jan 1997 |
| 557 | Gilmore Tank Service | Chase, KS 67524 | Oil Operator | Apr 2005 |
| 558 | Gilmore, Jeff | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2009 |
| 559 | Gilmore, Leo Oil, Inc. | Holliday, TX 76366 | Oil & Gas Operator | Oct 2025 |
| 560 | Gils Hot Oil Service | | Oil & Gas Operator | Jun 2022 |
| 561 | Gilster, Ralph R. III | Victoria, TX 77901 | Oil & Gas Operator | Jun 2004 |
| 562 | Gilstrap, Joel | Water Valley, TX 76958 | Oil & Gas Operator | Oct 2025 |
| 563 | Ginco Operating Co. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 564 | Ginder, Caleb | York, NY 14482 | Gas Operator | Dec 2024 |
| 565 | Ginger Oil | | Oil Operator | Mar 2025 |
| 566 | Ginger Oil Company | | Oil & Gas Operator | Jun 2015 |
| 567 | Ginger Oil Company (A) | The Woodlands, TX 77380 | Oil & Gas Operator | Jan 2016 |
| 568 | Ginger Petroleum Company, Inc. | La Grange, TX 78945 | Oil & Gas Operator | Oct 2025 |
| 569 | Gingerich Mike | McConnelsville, OH 43756 | Oil & Gas Operator | Dec 2010 |
| 570 | Ginnings Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2025 |
| 571 | Ginsweet Operating, Inc. | Borger, TX 79007 | Gas Operator | Oct 2025 |
| 572 | Ginther Oil, Inc. | Russell, KS 67665 | Oil Operator | Nov 2019 |
| 573 | Giras, Daniel F. | Alden, NY 14004 | Gas Operator | Dec 2024 |
| 574 | Girouard Richard L | | Oil Operator | May 1985 |
| 575 | Gish & McBead | | Oil Operator | Jan 1989 |
| 576 | Gishco Petroleum, Inc. | | Oil & Gas Operator | Apr 1992 |
| 577 | Givens, Bret | Hutchinson, KS 67501 | Oil Operator | Apr 2025 |
| 578 | GK Production LLC | Perry, OK 73077 | Oil Operator | Jul 2024 |
| 579 | GKM Inc | | Oil & Gas Operator | Mar 1990 |
| 580 | Gla Inc | Norman, OK 73070 | Oil & Gas Operator | Jun 2025 |
| 581 | Glacier Energy Corp | Bellevue, WA 98004 | Oil & Gas Operator | Dec 1991 |
| 582 | Glacier Minerals, LLC | The Woodlands, TX 77382 | Gas Operator | Jun 2025 |
| 583 | Glacier Park Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2001 |
| 584 | Glacier Petroleu | | Oil & Gas Operator | Nov 1995 |
| 585 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Jul 2025 |
| 586 | Glacier Petroleum Co., Inc. | Emporia, KS 66801 | Oil & Gas Operator | Jun 2025 |
| 587 | Glacier Production, Inc. | Cut Bank, MT 59427 | Oil Operator | Jul 2025 |
| 588 | Glade Operating Co. | Longview, TX 75604 | Oil & Gas Operator | Oct 2025 |
| 589 | Glade Operating, LLC | San Antonio, TX 78280 | Oil Operator | Oct 2025 |
| 590 | Glade Production | Gladewater, TX 75647 | Oil & Gas Operator | Nov 2008 |
| 591 | Gladewater Production Co., Inc. | Gladewater, TX 75647 | Oil & Gas Operator | Nov 1998 |
| 592 | Gladiator Operating LLC | Ardmore, OK 73401 | Oil & Gas Operator | Jul 2025 |
| 593 | Gladney Energy Partners, LLC | | Oil & Gas Operator | Dec 2024 |
| 594 | Gladson, Willard | Ira, TX 79527 | Oil & Gas Operator | Jun 1998 |
| 595 | Gladson, Willard Estate Of | Odessa, TX 79762 | Oil & Gas Operator | Oct 2025 |
| 596 | Glahn Resources, Inc. | Arlington, TX 76003 | Oil & Gas Operator | Oct 2025 |
| 597 | Glass Drilling Co. | | Oil Operator | Jan 1987 |
| 598 | Glass, Theodore G. | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |
| 599 | Glasscock Drilling, Inc. | | Oil & Gas Operator | Dec 1977 |
| 600 | Glassell Producing Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |