| 301 | Newhaven Operating Inc | | Oil & Gas Operator | Dec 1998 |
| 302 | Newkumet Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2020 |
| 303 | Newland Farm | Freedom, NY 14065 | Gas Operator | Dec 2024 |
| 304 | Newland Oil Comp | | Oil Operator | Sep 1996 |
| 305 | Newman & Scott | Duncan, OK 73534 | Oil & Gas Operator | Mar 2024 |
| 306 | Newman Bros Drilling | | Oil & Gas Operator | Apr 2004 |
| 307 | Newman Corporation | Harleton, TX 75651 | Oil & Gas Operator | Aug 2024 |
| 308 | Newman Cubed, Inc. | Fort Worth, TX 76147 | Oil & Gas Operator | Jun 2026 |
| 309 | Newman Operating Company | Freer, TX 78357 | Oil & Gas Operator | Jun 2021 |
| 310 | Newman, John A. | Joplin, MO 64804 | Oil & Gas Operator | Jan 2001 |
| 311 | Newmont Oil Company | | Oil & Gas Operator | Sep 1988 |
| 312 | Newpark Drilling Fluids LLC | Clinton, OK 73601 | Oil Operator | Dec 2013 |
| 313 | Newpark Environmental SVCS LLC | Lafayette, LA 70506 | Oil Operator | Jul 2014 |
| 314 | Newpek, LLC | Irving, TX 75039 | Oil & Gas Operator | Sep 2016 |
| 315 | Newport Gas Partners LLC | Gillette, WY 82716 | Oil & Gas Operator | Oct 2025 |
| 316 | Newport Oil Corporation | Clearwater, FL 33755 | Oil & Gas Operator | Jul 2011 |
| 317 | Newport Operating, LLC | Burkburnett, TX 76354 | Oil Operator | Jun 2026 |
| 318 | Newport Operators, LLC | | Oil & Gas Operator | Jan 2019 |
| 319 | Newstar Energy Of Texas L.L.C. | East Lansing, MI 48826 | Oil & Gas Operator | Mar 2008 |
| 320 | Newstar Energy USA Inc | Thornville, OH 43076 | Oil & Gas Operator | Aug 2004 |
| 321 | Newton Corp.,The | Dallas, TX 75251 | Oil & Gas Operator | Jun 2026 |
| 322 | Newton Steve Drilling | Worland, WY 82401 | Oil Operator | Apr 2001 |
| 323 | Newton, Richard R. | Wichita Falls, TX 76309 | Oil & Gas Operator | Nov 1996 |
| 324 | Newton, W. F. | Conroe, TX 77305 | Oil & Gas Operator | Jun 1994 |
| 325 | Newton, W. F. Estate Of | Conroe, TX 77305 | Oil & Gas Operator | Jan 2000 |
| 326 | Newturn Oil Company | Houston, TX 77208 | Oil & Gas Operator | Jan 2004 |
| 327 | Newwoods Petroleum LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2016 |
| 328 | Nexco Inc | Oklahoma City, OK 73102-6801 | Oil & Gas Operator | Nov 2013 |
| 329 | Nexen Oil And Gas U.S.A. Inc. | Calgary, AB T2P 5C1 | Oil & Gas Operator | Feb 2010 |
| 330 | Nexen Petroleum U.S.A. Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2012 |
| 331 | Nexstreem Corporation | | Oil & Gas Operator | Dec 2020 |
| 332 | Nextgen Petroleum LLC | Lubbock, TX 79407 | Oil Operator | Mar 2026 |
| 333 | Nextraction Energy Us Inc | Las Vegas, NV 89169 | Oil & Gas Operator | Feb 2018 |
| 334 | Nexus Resources Corporation | Drumright, OK 74030 | Oil & Gas Operator | Jan 2013 |
| 335 | Ney Oil Operations | | Oil Operator | Apr 1998 |
| 336 | Neyer Oil Inc | | Oil & Gas Operator | Nov 1997 |
| 337 | Neyman, Robert L. & Maureen J. | Batavia, NY 14020 | Gas Operator | Dec 2024 |
| 338 | Neymeiyer John Oil Co | | Oil Operator | Dec 1998 |
| 339 | NFC Petroleum Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1996 |
| 340 | Nfcda Energy LLC | Edmond, OK 73013 | Oil & Gas Operator | Mar 2026 |
| 341 | NFR Bear Paw Basin, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2013 |
| 342 | NFR Energy, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2017 |
| 343 | NGC Energy Company | | Oil & Gas Operator | May 1989 |
| 344 | Ngezi, LCC | Fort Worth, TX 76111 | Oil & Gas Operator | Jun 2026 |
| 345 | NGL Processing, LLC | | Oil Operator | Jun 2000 |
| 346 | NGM Noble LTD | Wooster, OH 44691 | Oil & Gas Operator | Dec 2025 |
| 347 | Ngo Development Corp. | Newark, OH 43055 | Oil & Gas Operator | Dec 2025 |
| 348 | NGX Company | Roswell, NM 88202 | Oil & Gas Operator | Jul 2008 |
| 349 | NHH Inc | Oklahoma City, OK 73162-7418 | Oil & Gas Operator | Feb 2002 |
| 350 | NHRG Inc | Wichita Falls, TX 76308 | Oil Operator | Jun 2026 |
| 351 | Nicco Operating Co. | | Oil & Gas Operator | May 1990 |
| 352 | Nicholas Water Service, Inc. | Zenda, KS 67159 | Oil Operator | Mar 2006 |
| 353 | Nichols Brothers | Abilene, TX 79604 | Oil & Gas Operator | Jun 2026 |
| 354 | Nichols Fluid Service, Inc. | Liberal, KS 67901 | Oil Operator | Jun 2019 |
| 355 | Nichols Oil & Gas Corporation | Shreveport, LA 71135 | Oil & Gas Operator | Aug 2003 |
| 356 | Nichols Oil Co. | Holliday, TX 76366 | Oil & Gas Operator | Jun 2026 |
| 357 | Nichols Oil Corp. | Holcomb, KS 67846 | Oil Operator | Dec 1994 |
| 358 | Nichols Operating LLC | Fort Branch, IN 47648 | Oil & Gas Operator | Dec 2024 |
| 359 | Nichols Water Service Inc | Forgan, OK 73938 | Oil & Gas Operator | May 2018 |
| 360 | Nichols, Carl E. | Azle, TX 76098 | Oil & Gas Operator | Aug 2004 |
| 361 | Nichols, Irl. A. Trust B | Duncan, OK 73534 | Oil & Gas Operator | Sep 2000 |
| 362 | Nichols, John Wesley | Little Elm, TX 75068 | Oil & Gas Operator | Jul 2011 |
| 363 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | Jun 2026 |
| 364 | Nick Oil | Abilene, TX 79601 | Oil & Gas Operator | Jun 2026 |
| 365 | Nickell & Son Oil & Salvage | Parker, KS 66072 | Oil Operator | Aug 2006 |
| 366 | Nickell Drilling | | Oil Operator | Jun 2010 |
| 367 | Nickell Oil Company | Walters, OK 73572 | Oil Operator | Apr 2018 |
| 368 | Nickerson, Royal | Clymer, NY 14724 | Gas Operator | Dec 2024 |
| 369 | Nicki T Oil & Gas LLC | Midland, TX 79711 | Oil Operator | Jun 2026 |
| 370 | Nickle Audrey O | Okmulgee, OK 74447-2823 | Oil & Gas Operator | Apr 2020 |
| 371 | Nicklos Oil & Gas Co. | Dallas, TX 75201 | Oil & Gas Operator | Nov 1986 |
| 372 | Nicolaysen G G Jr | | Oil & Gas Operator | Dec 1995 |
| 373 | Nicor Exploration | | Oil Operator | Jul 1993 |
| 374 | Nicor Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 375 | Nicor Production Company | Houston, TX 77002 | Oil & Gas Operator | May 1993 |
| 376 | Nicor Supply Company | Golden, CO 80401 | Oil & Gas Operator | Jun 1993 |
| 377 | Niedorf, Patrick Stephen | San Antonio, TX 78239 | Oil Operator | Jul 2001 |
| 378 | Niefergold, Martin & Suzanne | Lawtons, NY 14091 | Gas Operator | Dec 2024 |
| 379 | Niehage Oil Company, LLC | McPherson, KS 67460 | Oil Operator | Feb 2026 |
| 380 | Nielco, Inc. | Billings, MT 59103 | Oil & Gas Operator | Apr 2002 |
| 381 | Nielson & Associates, Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 382 | Nielson Capital Partners LLC | Cody, WY 82414 | Oil & Gas Operator | Dec 2014 |
| 383 | Nielson Enterpri | | Oil & Gas Operator | Sep 1987 |
| 384 | Nieset Lawrence & Christopher | Helena, OH 43435 | Oil Operator | Dec 2025 |
| 385 | Night Owl Well Service | Cairo, WV 26337-0000 | Oil & Gas Operator | Dec 2021 |
| 386 | Nighthawk Production LLC | | Oil & Gas Operator | May 2016 |
| 387 | Nijean, Inc. | Shawnee, OK 74802 | Oil & Gas Operator | Feb 2012 |
| 388 | Nimrod Petroleum Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Dec 2002 |
| 389 | Nine Point Energy, LLC | | Oil & Gas Operator | Oct 2021 |
| 390 | Nineveh Corp. | Dallas, TX 75208 | Oil & Gas Operator | Jun 2026 |
| 391 | Nip-N-Tuck Minerals, Inc. | | Gas Operator | Feb 1988 |
| 392 | Nippon Oil Exploration USA LTD | | Oil & Gas Operator | Dec 2010 |
| 393 | Nisrol, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Sep 2018 |
| 394 | Nitcher, Benton L. | Wellsville, KS 66092 | Oil & Gas Operator | Dec 1995 |
| 395 | Nitro Energy, Inc. | | Gas Operator | Dec 2005 |
| 396 | Nitro Oil & Gas, LLC | Cuero, TX 77954 | Oil & Gas Operator | Jun 2026 |
| 397 | Nitro Petroleum Inc | Phoenix, AZ 85016-4599 | Oil & Gas Operator | May 2020 |
| 398 | Nitro-Lift/Oklahoma Manufacturing LLC | Mill Creek, OK 74856 | Oil Operator | Jun 2026 |
| 399 | Nitschke, Dan E. | Henrietta, TX 76365 | Oil & Gas Operator | Jun 2026 |
| 400 | Nivens Productions LLC | Coyle, OK 73027-9785 | Oil & Gas Operator | Aug 2024 |