| 401 | HR McClure | Scottdale, PA 15683-1533 | Gas Operator | Dec 2018 |
| 402 | Huffman Arthur | Waynesburg, PA 15370-1437 | Gas Operator | Dec 2025 |
| 403 | Hundred Foot Production LLC | Cranberry, PA 16319 | Oil & Gas Operator | Dec 2017 |
| 404 | Hunt Marcellus Opr Co LLC | Wilcox, PA 15870 | Oil & Gas Operator | Jan 2019 |
| 405 | Huntley & Huntley Inc | Monroeville, PA 15146-2302 | Oil & Gas Operator | Dec 2019 |
| 406 | Idc Energy Corp | Warren, PA 16365-0792 | Oil & Gas Operator | Dec 2021 |
| 407 | Igas Corp | Charlottesville, VA 22905-5246 | Gas Operator | Dec 2000 |
| 408 | Il Geer & Sons Partnership | Clarendon, PA 16313-4107 | Oil & Gas Operator | Dec 2013 |
| 409 | Imod Oil Prod LLC | Pleasantville, PA 16341-0149 | Oil & Gas Operator | Dec 2009 |
| 410 | Indian Hill Gas Co Inc | Fayette City, PA 15438-1203 | Oil & Gas Operator | Dec 2025 |
| 411 | Indiana CC | Indiana, PA 15701-1314 | Gas Operator | Dec 2025 |
| 412 | Inflection Energy (Pa) LLC | Montoursville, PA 17754-9702 | Gas Operator | Mar 2025 |
| 413 | Inr Opr LLC | Morgantown, WV 26508-9201 | Gas Operator | Dec 2025 |
| 414 | Integrity Funding Sys Inc | Lancaster, PA 17602-1933 | Gas Operator | Dec 2007 |
| 415 | Interstate Gas MKT Inc | Indiana, PA 15701 | Oil & Gas Operator | Dec 2018 |
| 416 | Iron City Wells LLC | Saxonburg, PA 16056-8802 | Gas Operator | Dec 2025 |
| 417 | Iron Pennsylvania Land LLC | Waynesburg, PA 15370 | Gas Operator | Dec 2025 |
| 418 | Iroquois Ave LLC | Edinboro, PA 16412 | Gas Operator | Dec 2025 |
| 419 | Isaacs Scott J Jr | Butler, PA 16002-0059 | Gas Operator | Nov 2025 |
| 420 | Iseman William R | Ford City, PA 16226-1488 | Gas Operator | Dec 2025 |
| 421 | Itl Corp | Beachwood, OH 44122-5821 | Gas Operator | Dec 2017 |
| 422 | J & J Enterprises Inc | Indiana, PA 15701-1473 | Gas Operator | Dec 1985 |
| 423 | J & L Allen Inc | Sugar Grove, PA 16350-5606 | Oil & Gas Operator | Dec 2020 |
| 424 | J & M Co Inc | Abilene, TX 79601 | Oil & Gas Operator | Jan 2016 |
| 425 | J & M Well SVC LLC | Indiana, PA 15701-1550 | Gas Operator | Dec 2025 |
| 426 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Feb 2026 |
| 427 | Jab Enterprises Inc | Erie, PA 16510-2181 | Gas Operator | Dec 2009 |
| 428 | Jack Co | Indiana, PA 15701-0697 | Oil & Gas Operator | Dec 2013 |
| 429 | Jack Production Inc | Indiana, PA 15701-0697 | Oil & Gas Operator | Dec 2011 |
| 430 | James & Wilfred Meyers | Indiana, PA 15701-9266 | Gas Operator | Dec 2025 |
| 431 | James Drilling Corp | Blairsville, PA 15717 | Oil & Gas Operator | Dec 2004 |
| 432 | James E Mead Mead Oil Co | Sheffield, PA 16347-0667 | Oil & Gas Operator | Dec 2011 |
| 433 | JC Enterprises | Andrews, TX 79714 | Oil & Gas Operator | Jun 2012 |
| 434 | Jennifer Petro LTD | Olean, NY 14760-3355 | Gas Operator | Dec 1984 |
| 435 | Jerome K & Rosemary Graber | Jamestown, PA 16134 | Oil & Gas Operator | Dec 2022 |
| 436 | Jesmar Energy Inc | Holbrook, PA 15341-1318 | Oil & Gas Operator | Dec 2025 |
| 437 | Jett Oil LLC | Warren, PA 16365-4366 | Oil & Gas Operator | Dec 2025 |
| 438 | JJ Bucher Producing Corp | Wellsville, NY 14895 | Oil & Gas Operator | Dec 2024 |
| 439 | JKLM Energy LLC | Sewickly, PA 15143 | Gas Operator | Dec 2025 |
| 440 | JMG Energy LLC | Cochranton, PA 16314 | Oil & Gas Operator | Dec 2025 |
| 441 | JMM Resources LLC | Indianola, PA 15051 | Oil & Gas Operator | Dec 2024 |
| 442 | John E Saul Corp | Apollo, PA 15613-8313 | Gas Operator | Dec 2025 |
| 443 | John F & Lewis L Garing | Chicora, PA 16025-2037 | Oil & Gas Operator | Dec 2025 |
| 444 | John F McConnell | Ebensburg, PA 15931-5408 | Gas Operator | Dec 2024 |
| 445 | John L Crawford Inc | New Bethlehem, PA 16242-2113 | Oil & Gas Operator | Dec 2025 |
| 446 | Jones Dev Inc | Warren, PA 16365-1460 | Oil & Gas Operator | Dec 2018 |
| 447 | Jr Resources LP | Ringgold, PA 15770-8346 | Oil & Gas Operator | Dec 2021 |
| 448 | Juart Exploration Inc | Home, PA 15747-6711 | Gas Operator | Dec 2017 |
| 449 | Judy M & Michael K Hetrick | New Bethlehem, PA 16242-1617 | Gas Operator | Dec 2025 |
| 450 | K & L Gas & Oil | Homer City, PA 15748-6033 | Gas Operator | Dec 2007 |
| 451 | K & L Gas & Oil Inc | Homer City, PA 15748-6033 | Oil & Gas Operator | Dec 2018 |
| 452 | K. Petroleum, Inc. | Gahanna, OH 43230 | Oil & Gas Operator | Dec 2025 |
| 453 | Kaib & Kaib | Zanesville, OH 43701-6251 | Gas Operator | Dec 2025 |
| 454 | Kastle Resources Enterprises Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2025 |
| 455 | Kavouras Thomas | Apollo, PA 15613-1108 | Oil & Gas Operator | Dec 2023 |
| 456 | KCS Energy Inc | Warren, PA 16365-0187 | Oil & Gas Operator | Dec 2025 |
| 457 | Keane Dev | Bradford, PA 16701-3901 | Oil & Gas Operator | Dec 1998 |
| 458 | Keck Timothy A | Summerville, PA 15864-6301 | Gas Operator | Dec 2014 |
| 459 | Keith McClure | Waynesburg, PA 15370-3636 | Oil & Gas Operator | Dec 2025 |
| 460 | Kerpoe Stanley J | Tonawanda, NY 14150-8114 | Oil & Gas Operator | Dec 1989 |
| 461 | Kerr McGee Chem Corp | Oklahoma City, OK 73125-0861 | Gas Operator | Dec 1989 |
| 462 | Keyrock Energy LLC | Johnson City, TN 37604-5749 | Oil & Gas Operator | Dec 2024 |
| 463 | Keystate Inc | Davidsville, PA 15928-9655 | Gas Operator | Dec 2012 |
| 464 | Keystone Acquisitions LLC | Anita, PA 15711-9747 | Gas Operator | Dec 2025 |
| 465 | Keystone Energy Oil & Gas Inc | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2016 |
| 466 | Keystone Land Resources Inc | St Clairsville, OH 43950 | Oil & Gas Operator | Dec 2025 |
| 467 | Keystone Resources Inc | Cranberry Township, PA 16066-6446 | Gas Operator | Dec 1992 |
| 468 | Kidder Exploration Inc | Jamestown, NY 14701-5613 | Gas Operator | Dec 1991 |
| 469 | Kimmel Glenn | Shelocta, PA 15774-2233 | Gas Operator | Dec 2024 |
| 470 | King Harry L | Parker, PA 16049-0288 | Oil & Gas Operator | Dec 1993 |
| 471 | Kis Oil & Gas Inc | Brookville, PA 15825-4210 | Oil & Gas Operator | Dec 2014 |
| 472 | Koebley Timothy W | Warren, PA 16365-2102 | Oil & Gas Operator | Dec 2025 |
| 473 | Kriebel Acquisition Co LLC | Clarion, PA 16214-6161 | Oil & Gas Operator | Dec 2025 |
| 474 | Kriebel Gas Inc | Clarion, PA 16214-0765 | Oil & Gas Operator | Dec 1999 |
| 475 | Kriebel Minerals Inc | Clarion, PA 16214-6161 | Oil & Gas Operator | Dec 2020 |
| 476 | Kriebel Natural Gas Co LLC | Clarion, PA 16214-6161 | Oil & Gas Operator | Dec 2025 |
| 477 | KSM Energy Inc | Pittsburgh, PA 15238-3156 | Gas Operator | Dec 2024 |
| 478 | Kuzemchak Theodore J | Clymer, PA 15728-7910 | Gas Operator | Dec 2025 |
| 479 | Kylander Oil Inc | Warren, PA 16365-4366 | Oil & Gas Operator | Dec 2025 |
| 480 | Kyle Energy Inc NV | Apollo, PA 15613-0249 | Gas Operator | Dec 1996 |
| 481 | L & B Energy LLP | Kingsville, OH 44048 | Oil & Gas Operator | Dec 2023 |
| 482 | L & H Energy Co Inc | Knox, PA 16232-4874 | Oil & Gas Operator | Dec 2020 |
| 483 | La Oil & Gas LLC | Warren, PA 16365 | Oil & Gas Operator | Dec 2025 |
| 484 | Labelle Wayne R | Punxsutawney, PA 15767-1161 | Gas Operator | Dec 2025 |
| 485 | Lahd Energy Inc | Canton, OH 44709 | Gas Operator | Dec 2009 |
| 486 | Lake City Ind Inc | Lake City, PA 16423-1208 | Gas Operator | Dec 2023 |
| 487 | Lake Erie Energy Part LLC | Erie, PA 16505-4760 | Oil & Gas Operator | Dec 2012 |
| 488 | Lamar Exploration Corp | Orchard Park, NY 14217 | Gas Operator | Dec 1998 |
| 489 | Langasco Energy Corp | Alliance, OH 44601 | Oil & Gas Operator | Dec 1987 |
| 490 | Lapradd George C | Cochranton, PA 16314-5634 | Oil & Gas Operator | Dec 2005 |
| 491 | Laurel Mountain Production | Pittsburgh, PA 15241-1633 | Oil & Gas Operator | Dec 2025 |
| 492 | Leali & Leali Oil Inc | Hermitage, PA 16148-9020 | Oil & Gas Operator | Dec 2016 |
| 493 | Leatherwood, LLC | Canonsburg, PA 15317-6506 | Oil & Gas Operator | Dec 2023 |
| 494 | Leboeuf MFG Inc | Waterford, PA 16441-0458 | Gas Operator | Dec 1990 |
| 495 | Lee E & M Lee Minter | New Kensington, PA 15068-1440 | Gas Operator | Dec 2003 |
| 496 | Lee Lynn MGMT Co | Indiana, PA 15701-3400 | Oil & Gas Operator | Dec 1991 |
| 497 | Leechburg Gas Co | Apollo, PA 15613-1125 | Gas Operator | Dec 2010 |
| 498 | Legacy Ogc LLC | Erie, PA 16509 | Oil & Gas Operator | Dec 2025 |
| 499 | Lenape Resources Corp | | Oil & Gas Operator | Dec 2000 |
| 500 | Lendrum Energy LLC | Cranberry, PA 16319-4009 | Oil & Gas Operator | Dec 2025 |