| 22401 | Petro-Canada Resources (USA) Inc | Denver, CO 80202-472 | Oil & Gas Operator | Feb 2010 |
| 22402 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 22403 | Petro-Flow, Inc | | Gas Operator | Dec 2023 |
| 22404 | Petro-Go, Inc. | | Oil & Gas Operator | Mar 1996 |
| 22405 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 22406 | Petro-Guard Production,L.L.C. | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 22407 | Petro-Haley | Borger, TX 79008 | Oil & Gas Operator | Oct 2025 |
| 22408 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 22409 | Petro-Hunt Dakota, LLC | | Oil & Gas Operator | Aug 2025 |
| 22410 | Petro-Hunt Permian, LLC | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 22411 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 22412 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 22413 | Petro-Lud Inc. | | Oil & Gas Operator | Aug 2025 |
| 22414 | Petro-Mac Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 22415 | Petro-Management Assoc., Inc. | Edmond, OK 73083-2346 | Oil & Gas Operator | Jun 2007 |
| 22416 | Petro-Management Inc | | Oil Operator | Dec 1998 |
| 22417 | Petro-Mark, Inc. | St Petersburg, FL 33701 | Oil & Gas Operator | Dec 2021 |
| 22418 | Petro-Met Energy LLC | Edmond, OK 73034-1237 | Oil Operator | Jun 2025 |
| 22419 | Petro-Raider LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 22420 | Petro-Smith Operating LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2025 |
| 22421 | Petro-Technology | | Oil & Gas Operator | Aug 1991 |
| 22422 | Petro-Technology, Inc. | Topeka, KS 66604 | Gas Operator | Dec 1997 |
| 22423 | Petro-Tex Energy & Expl.Co.,Inc. | Llano, TX 78643 | Oil & Gas Operator | Oct 2025 |
| 22424 | Petro-Ventures, Inc. - Miss. | | Oil & Gas Operator | Apr 2009 |
| 22425 | Petro-West Corporation | Lubbock, TX 79404 | Oil & Gas Operator | Oct 2001 |
| 22426 | Petro-X Corporation | Houston, TX 77092 | Oil & Gas Operator | Jul 2002 |
| 22427 | Petrobal Omega 1, LLC | Little Elm, TX 75068 | Oil & Gas Operator | Oct 2025 |
| 22428 | Petrobank Opr Co | Denver, CO 80202-4675 | Gas Operator | Dec 1992 |
| 22429 | Petroc Company | Rocky River, OH 44116 | Oil Operator | Dec 2008 |
| 22430 | Petrocan, Inc. | | Oil & Gas Operator | Apr 1998 |
| 22431 | Petrocana,Inc. | | Oil & Gas Operator | Aug 1993 |
| 22432 | Petrocat Innovations, LLC | Forney, TX 75126 | Oil Operator | Oct 2025 |
| 22433 | Petrocoastal, Inc. | Frisco, TX 75036 | Oil & Gas Operator | Oct 2025 |
| 22434 | Petrocon Inc | Delaware, OH 43015-7147 | Oil & Gas Operator | Dec 2010 |
| 22435 | Petrocorp | | Oil & Gas Operator | Nov 1992 |
| 22436 | Petrocorp Acquisition Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2002 |
| 22437 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 22438 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 22439 | Petroda Oil & Gas LLC | Edmond, OK 73054 | Oil & Gas Operator | Feb 2023 |
| 22440 | Petrodata Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 22441 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jun 2025 |
| 22442 | Petrodril Inc | Farmington, NM 87401 | Oil & Gas Operator | Jan 1987 |
| 22443 | Petroel | Marietta, OH 45750 | Oil & Gas Operator | Dec 2000 |
| 22444 | Petroflow Energy Corporation | Tulsa, OK 74119-5405 | Oil & Gas Operator | Oct 2016 |
| 22445 | Petrofunds, Inc & Sunny South | | Oil & Gas Operator | Feb 1984 |
| 22446 | Petrofunds, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 1996 |
| 22447 | Petrofunds, Inc. & Herd | | Oil & Gas Operator | Mar 1984 |
| 22448 | Petrogas Energy Services, LLC | Dallas, TX 75214 | Oil Operator | Oct 2025 |
| 22449 | Petrogas Exploration Inc | | Oil Operator | Feb 2025 |
| 22450 | Petrogas Operating Corporation | Garland, TX 75043 | Oil Operator | Feb 2010 |
| 22451 | Petrogen, Incorporated | Katy, TX 77450 | Oil & Gas Operator | Jan 2012 |
| 22452 | Petroglen Company, Inc. | | Oil & Gas Operator | Jul 1990 |
| 22453 | Petroglyph Operating Co | Boise, ID 83709 | Oil & Gas Operator | Jul 2017 |
| 22454 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 22455 | Petrohawk Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2005 |
| 22456 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 22457 | Petrol Industries, Inc. | Shreveport, LA 71137 | Oil & Gas Operator | Jun 2012 |
| 22458 | Petrol Oil & Gas, Inc. | Overland Park, KS 66210 | Oil & Gas Operator | Dec 2008 |
| 22459 | Petrolanic Inc | Tulsa, OK 74105 | Oil Operator | Oct 1991 |
| 22460 | Petrolegacy Energy II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2023 |
| 22461 | Petrolero Corp. | San Antonio, TX 78205 | Oil & Gas Operator | Sep 1994 |
| 22462 | Petrolero, LLC | Plano, TX 75026 | Oil & Gas Operator | Oct 2025 |
| 22463 | Petroleum Advisors Int'L., Inc. | Houston, TX 77224 | Gas Operator | Jun 2005 |
| 22464 | Petroleum Capital, L.C. | Dallas, TX 75367 | Oil & Gas Operator | Oct 2025 |
| 22465 | Petroleum Corpor | | Oil Operator | Jan 1983 |
| 22466 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 22467 | Petroleum Develo | | Oil Operator | Sep 1986 |
| 22468 | Petroleum Development Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 22469 | Petroleum Development Cor | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2004 |
| 22470 | Petroleum Development Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 22471 | Petroleum Development LLC | | Oil Operator | Jul 2018 |
| 22472 | Petroleum Energy | | Oil & Gas Operator | Mar 1991 |
| 22473 | Petroleum Energy Corp | | Oil & Gas Operator | Aug 2012 |
| 22474 | Petroleum Energy, Inc. | Wichita, KS 67202 | Oil Operator | May 1999 |
| 22475 | Petroleum Engineering & Management Corp. | Casper, WY 82609 | Oil & Gas Operator | Jul 2018 |
| 22476 | Petroleum Engineers, Inc. | | Oil & Gas Operator | Jun 1983 |
| 22477 | Petroleum Enterp | | Oil & Gas Operator | Sep 1995 |
| 22478 | Petroleum Enterprises, Inc. | Hutchinson, KS 67504 | Oil & Gas Operator | May 2001 |
| 22479 | Petroleum Exchange | | Oil & Gas Operator | Oct 1997 |
| 22480 | Petroleum Explo Prod Inc | Oilton, OK 74052 | Oil & Gas Operator | Jan 2017 |
| 22481 | Petroleum Explor | | Oil Operator | Aug 1983 |
| 22482 | Petroleum Exploration Company LTD Dba Petex | | Oil Operator | Aug 2025 |
| 22483 | Petroleum Exploration Company LTD LP | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 22484 | Petroleum Exploration Company LTD., Limited | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 22485 | Petroleum Futures-Chapman Oil | | Oil & Gas Operator | Jul 1981 |
| 22486 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 22487 | Petroleum Incorp | | Oil & Gas Operator | Apr 1993 |
| 22488 | Petroleum International, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2000 |
| 22489 | Petroleum Investment Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 22490 | Petroleum Investments, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Dec 1977 |
| 22491 | Petroleum Land Company | Abilene, TX 79606 | Oil & Gas Operator | May 2000 |
| 22492 | Petroleum Manage | | Oil & Gas Operator | Oct 1994 |
| 22493 | Petroleum Management Int'L, Inc. | Sugar Land, TX 77487 | Oil & Gas Operator | Oct 1993 |
| 22494 | Petroleum Management LLC | | Oil & Gas Operator | May 2011 |
| 22495 | Petroleum Management Prof Inc | Oklahoma City, OK 73120-1848 | Oil & Gas Operator | Apr 2009 |
| 22496 | Petroleum Management, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Oct 2025 |
| 22497 | Petroleum Prod. MGMT | | Oil Operator | Nov 1995 |
| 22498 | Petroleum Produc | | Oil & Gas Operator | Dec 1996 |
| 22499 | Petroleum Production Corporation | Rantoul, KS 66079 | Oil Operator | Feb 2024 |
| 22500 | Petroleum Production Engineering | Fulton, TX 78358 | Oil Operator | Feb 2019 |