| 301 | North American Drilling & Exploration, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Aug 2015 |
| 302 | North Plains Oil | | Oil Operator | Jul 1990 |
| 303 | Northern Lights Oil Company, LLC | Andover, KS 67002 | Oil & Gas Operator | Feb 2026 |
| 304 | Northstar Investments, Inc. | Wichita, KS 67230 | Oil & Gas Operator | Feb 2026 |
| 305 | Novy Oil & Gas, Inc. | Goddard, KS 67052 | Oil & Gas Operator | Apr 2026 |
| 306 | NPF Energy Corporation | Boise, ID 83708 | Oil & Gas Operator | Feb 2026 |
| 307 | Oil Producers In | | Oil & Gas Operator | Dec 1996 |
| 308 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Jun 2026 |
| 309 | Oil Prop Company | | Oil & Gas Operator | Sep 1995 |
| 310 | Oil Property Man | | Oil & Gas Operator | Jun 1995 |
| 311 | Oil Property Management Inc | Attica, KS 67009 | Oil & Gas Operator | Feb 2021 |
| 312 | Oklahoma Rig & Salvage Inc | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 313 | Okmar Oil Compan | | Oil & Gas Operator | Feb 1995 |
| 314 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Jun 2026 |
| 315 | Palomino Petrole | | Oil & Gas Operator | Dec 1995 |
| 316 | Palomino Petroleum | Newton, KS 67114 | Oil Operator | Oct 2003 |
| 317 | Palomino Petroleum Inc | Newton, KS 67114 | Oil & Gas Operator | Feb 2026 |
| 318 | Parrish Corporat | | Oil & Gas Operator | Oct 1994 |
| 319 | Parrish Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jun 2002 |
| 320 | Parten, Kenneth N. | St John, KS 67576 | Oil & Gas Operator | May 2009 |
| 321 | Pate-Dombaugh Pe | | Oil Operator | Sep 1991 |
| 322 | Patton Oil Compa | | Oil & Gas Operator | Nov 1994 |
| 323 | Pauley Oil | | Oil Operator | Feb 2026 |
| 324 | Peak Energy LLC | Coffeyville, KS 67337 | Oil & Gas Operator | Dec 2025 |
| 325 | Peak Oil Company LLC | Branson West, MO 65737 | Oil Operator | Dec 2009 |
| 326 | Pendulum Petrole | | Oil & Gas Operator | Dec 1995 |
| 327 | Petro Locators I | | Oil & Gas Operator | Dec 1995 |
| 328 | Petro Locators, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Feb 2026 |
| 329 | Petroleum Energy | | Oil & Gas Operator | Mar 1991 |
| 330 | Petroleum Energy, Inc. | Wichita, KS 67202 | Oil Operator | May 1999 |
| 331 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 332 | Petroleum Incorp | | Oil & Gas Operator | Apr 1993 |
| 333 | Petroleum Technologies, Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Feb 2026 |
| 334 | Phillips Exploration Company L.C. | Andover, KS 67002 | Oil & Gas Operator | Feb 2026 |
| 335 | Phillips Petrole | | Oil & Gas Operator | May 1995 |
| 336 | Pickrell Drilling Co., Inc. | Wichita, KS 67213 | Oil & Gas Operator | Feb 2026 |
| 337 | Pintail Petroleu | | Oil & Gas Operator | Dec 1995 |
| 338 | Pintail Petroleum, LTD. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2021 |
| 339 | Pioneer Operatio | | Oil & Gas Operator | Mar 1986 |
| 340 | Poor Boy Corporation | Ellinwood, KS 67526 | Oil Operator | Jan 2026 |
| 341 | Popp Operating, Inc. | Hoisington, KS 67544 | Oil Operator | Feb 2026 |
| 342 | Prater Oil & Gas Operations, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Feb 2026 |
| 343 | Pratt Well Service, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Feb 2026 |
| 344 | Prolific Resources LLC | Wichita, KS 67208 | Oil & Gas Operator | Feb 2026 |
| 345 | Provecho Partners | Hays, KS 67601 | Oil Operator | Apr 2005 |
| 346 | Quadel Energy Co | | Oil & Gas Operator | Feb 1994 |
| 347 | Quest Energy LLC | Salina, KS 67401 | Oil Operator | Feb 2026 |
| 348 | Questar Exploration And Production Company Division Of Questar Urc Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2026 |
| 349 | Rains & Williams | | Oil & Gas Operator | Nov 1995 |
| 350 | Rama Operating C | | Oil & Gas Operator | Dec 1996 |
| 351 | Rama Operating Company Inc | Stafford, KS 67578 | Oil & Gas Operator | Mar 2026 |
| 352 | Raymond Oil Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | Feb 2026 |
| 353 | Raymond Oil Comp | | Oil & Gas Operator | Dec 1996 |
| 354 | Reach Petroleum | | Oil & Gas Operator | Jan 1994 |
| 355 | Red Hills Energy, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Feb 2026 |
| 356 | Red Oak Energy, Inc. | Wichita, KS 67207 | Oil & Gas Operator | Feb 2026 |
| 357 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 358 | Reichlinger Business Services | | Oil Operator | Apr 2014 |
| 359 | Reif Oil & Gas Company LLC | Hoisington, KS 67544 | Oil Operator | Aug 2010 |
| 360 | Reif Oil Operati | | Oil Operator | Nov 1988 |
| 361 | Richlan Drilling, A General Partnership | Beaver, KS 67525 | Oil & Gas Operator | Feb 2026 |
| 362 | Rine Exploration | | Oil & Gas Operator | Jul 1994 |
| 363 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Feb 2026 |
| 364 | Ritchie, A. Scott | Wichita, KS 67202 | Oil Operator | Mar 1988 |
| 365 | RJM Company | Claflin, KS 67525 | Oil & Gas Operator | Feb 2026 |
| 366 | Robert-Gay Energ | | Oil & Gas Operator | Jun 1992 |
| 367 | Rockhound Petroleum, LLC | St. John, KS 67576 | Oil & Gas Operator | Feb 2026 |
| 368 | Rogers Merlin D | | Oil Operator | Feb 2001 |
| 369 | Rosel Energy, Inc. | Liberal, KS 67901 | Oil & Gas Operator | Jul 2004 |
| 370 | Roxana Corporati | | Oil & Gas Operator | Feb 1993 |
| 371 | Royal Energy, Inc. | Dodge City, KS 67801 | Oil Operator | Dec 2019 |
| 372 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Feb 2026 |
| 373 | Russell Oil, Inc. | Edmond, OK 73083 | Oil Operator | Feb 2026 |
| 374 | Russell, Gerald W. | Tulsa, OK 74103 | Oil Operator | Feb 1986 |
| 375 | Ryan, Daniel J. | Oklahoma City, OK 73139 | Oil Operator | Sep 2003 |
| 376 | S & J Oil Company | Ellinwood, KS 67526 | Oil Operator | Jun 2000 |
| 377 | S & J Operating | | Oil Operator | May 1989 |
| 378 | Santa Fe Pipe & | | Oil & Gas Operator | Dec 1991 |
| 379 | Scheck Oil Operation | | Oil & Gas Operator | Feb 2026 |
| 380 | Schierling, Eldon J. | Wichita, KS 67202 | Oil & Gas Operator | Feb 2026 |
| 381 | Schneider Oil Co | | Oil Operator | Oct 1988 |
| 382 | Schwertfeger, Donald E. Oil | Preston, KS 67569 | Oil Operator | Jan 1999 |
| 383 | Seibert Oil, LLC | Macksville, KS 67557 | Oil & Gas Operator | Jul 2025 |
| 384 | Siroky Oil Management | Pratt, KS 67124 | Oil & Gas Operator | Feb 2026 |
| 385 | Smith Oil Operations | | Oil & Gas Operator | Feb 2026 |
| 386 | Smith Richard F | | Oil Operator | Jun 1995 |
| 387 | Smokey Valley Resources | Lyons, KS 67554 | Oil Operator | Jun 1998 |
| 388 | Sokan Operating, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Feb 2026 |
| 389 | Southern States | | Oil & Gas Operator | Jul 1988 |
| 390 | Stalcup Oil Comp | | Oil Operator | Dec 1992 |
| 391 | Stalcup Oil Company | | Oil Operator | Oct 2009 |
| 392 | Sterling Oil Co. | Sterling, KS 67579 | Oil Operator | Feb 2000 |
| 393 | Stewart W C Oil | | Oil Operator | Jun 1986 |
| 394 | Stratakan Exploration, LLC | Plainville, KS 67663 | Oil & Gas Operator | Feb 2026 |
| 395 | Striker Petroleum Corporation | Englewood, CO 80111 | Oil & Gas Operator | Dec 1999 |
| 396 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Feb 2026 |
| 397 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 398 | Supernova Energy, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Nov 2019 |
| 399 | T-Bar Exploration, Inc. | Sterling, KS 67579 | Oil Operator | Apr 1998 |
| 400 | T-N-T Engineering, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2026 |