| 301 | Park Energy Petroleum LLC | | Oil Operator | Mar 2023 |
| 302 | Patara Oil & Gas LLC | Dallas, TX 75219 | Oil & Gas Operator | Mar 2018 |
| 303 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 304 | PCR Operating LLC | | Oil & Gas Operator | Jul 2024 |
| 305 | PDC Energy Inc | Denver, CO 80203 | Oil & Gas Operator | Nov 2025 |
| 306 | Peakview Operating Company, LLC | | Oil & Gas Operator | Oct 2025 |
| 307 | Pelican Hill Oil & Gas, Inc. | Carlsbad, CA 92010 | Oil & Gas Operator | May 2013 |
| 308 | Peterson Energy Operating Inc | Loveland, CO 80537 | Oil & Gas Operator | Nov 2025 |
| 309 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 310 | Petro Mex Resources | | Oil & Gas Operator | Aug 2025 |
| 311 | Petro Operating Company LLC | | Oil & Gas Operator | Oct 2025 |
| 312 | Petro-Canada Resources (USA) Inc | Denver, CO 80202-472 | Oil & Gas Operator | Feb 2010 |
| 313 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 314 | Petrohunter Operating Company | | Oil & Gas Operator | Dec 2013 |
| 315 | Petroleum Energy Corp | | Oil & Gas Operator | Jul 2012 |
| 316 | Petroleum Exploration Company LTD Dba Petex | | Oil & Gas Operator | Oct 2025 |
| 317 | Petroleum Management LLC | Platteville, CO 80651 | Oil & Gas Operator | Mar 2011 |
| 318 | Petroleum Resource Management Corp | Denver, CO 80203 | Oil & Gas Operator | Nov 2025 |
| 319 | Petron Development Company | | Oil & Gas Operator | Sep 2020 |
| 320 | Petroshare Corporation | | Oil & Gas Operator | Jan 2024 |
| 321 | Petrox Resources Inc | Meeker, CO 81641 | Oil & Gas Operator | Nov 2025 |
| 322 | Phoenix Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Jul 2022 |
| 323 | Piceance Energy LLC | | Oil & Gas Operator | Oct 2025 |
| 324 | Piland Resources | | Oil & Gas Operator | Mar 2022 |
| 325 | Pineland Operating Company, LLC | Dallas, TX 75231 | Oil & Gas Operator | Oct 2025 |
| 326 | Pintail Petroleum, LTD. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2021 |
| 327 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Sep 2025 |
| 328 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 329 | Platinum Gas Properties LLC | | Gas Operator | Oct 2025 |
| 330 | Plug Nickel Oil Company Inc | | Oil & Gas Operator | Oct 2025 |
| 331 | Poc-I LLC | Casper, WY 82605 | Oil & Gas Operator | Nov 2025 |
| 332 | Polaris Production Opco LLC | | Oil & Gas Operator | Oct 2025 |
| 333 | Poncho Production Co | | Oil & Gas Operator | Jan 2022 |
| 334 | Prairie Operating Co LLC | | Oil & Gas Operator | Oct 2025 |
| 335 | Prairie Resources LLC | | Oil Operator | Oct 2025 |
| 336 | Pre Resources Inc | | Oil & Gas Operator | Jul 2016 |
| 337 | Presco Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2020 |
| 338 | Prime Operating Company | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 339 | Production Management Inc | | Oil & Gas Operator | Oct 2006 |
| 340 | Pronghorn Operating LLC | | Oil & Gas Operator | Jan 2023 |
| 341 | Prospect Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 342 | Providence Operating LLC Dba Poco Operating | | Oil & Gas Operator | Nov 2025 |
| 343 | Prudent Resources LLC | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 344 | Puckett Land Company | | Oil & Gas Operator | Dec 2020 |
| 345 | Puckett-Warren Oil Co | | Oil Operator | Dec 2004 |
| 346 | QB Energy Operating LLC | | Oil & Gas Operator | Oct 2025 |
| 347 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 348 | Quicksilver Resources Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2018 |
| 349 | Rampike Resources, LTD | Denver, CO 80202 | Oil Operator | Sep 2025 |
| 350 | Red Mesa Holdings/O&G LLC | | Oil & Gas Operator | Nov 2014 |
| 351 | Red Mountain Energy LLC | | Oil & Gas Operator | Sep 2017 |
| 352 | Red Mountain Resources LLC | | Oil & Gas Operator | Sep 2023 |
| 353 | Red River Ranch Holdings LLC | | Gas Operator | Jan 2015 |
| 354 | Red Willow Production Company | | Oil & Gas Operator | Oct 2025 |
| 355 | Renegade Oil & Gas Company LLC | | Oil & Gas Operator | Oct 2025 |
| 356 | Retamco Operating Inc | Red Lodge, MT 59068 | Oil & Gas Operator | Oct 2025 |
| 357 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 358 | Rio Mesa Resources Inc | | Oil Operator | Jul 2022 |
| 359 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 360 | Robertson* Dexter | | Gas Operator | Dec 2018 |
| 361 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 362 | Roughhouse Oil & Gas LLC | | Oil & Gas Operator | Oct 2025 |
| 363 | Ruth* Ula Pearl | | Oil & Gas Operator | Sep 2019 |
| 364 | RWL Enterprises | | Oil & Gas Operator | Feb 2017 |
| 365 | S & D LLC | | Oil & Gas Operator | Aug 2022 |
| 366 | Saga Petroleum Limited Liability Co Of Co | | Oil & Gas Operator | Sep 2015 |
| 367 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 368 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 369 | San Marco Petroleum Inc | Denver, CO 80293 | Oil & Gas Operator | Dec 2025 |
| 370 | Sandlin Oil Corp | Dacono, CO 80514 | Oil & Gas Operator | Oct 2025 |
| 371 | Santa Fe Natural Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Dec 2021 |
| 372 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | Dec 2025 |
| 373 | Schneider Energy Services Inc | | Oil & Gas Operator | Nov 2025 |
| 374 | Schreider & Company, Inc | | Oil & Gas Operator | Jun 2023 |
| 375 | Schutz* Richard E | | Oil Operator | Nov 2025 |
| 376 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 377 | Seeley Oil Company, LLC | Cortez, CO 81321 | Oil & Gas Operator | Nov 2025 |
| 378 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 379 | SG Interests I LTD | Houston, TX 77007 | Oil & Gas Operator | Oct 2025 |
| 380 | Shawnee Oil Development Co Inc | | Oil & Gas Operator | Oct 2025 |
| 381 | Silver Mountain Energy LLC | | Gas Operator | Nov 2025 |
| 382 | Simcoe LLC | Durango, CO 81301 | Oil & Gas Operator | Nov 2025 |
| 383 | Simmons, Inc.* D. J. | | Oil & Gas Operator | May 2020 |
| 384 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 385 | Smith Energy Corp | | Oil & Gas Operator | Jan 2024 |
| 386 | Smith Energy LLC | | Oil & Gas Operator | Nov 2025 |
| 387 | Smith Oil Properties Inc | | Oil & Gas Operator | Nov 2022 |
| 388 | Sonterra Energy LLC | Wichita, KS 67226 | Oil & Gas Operator | Jul 2022 |
| 389 | Southwestern Production Corporation | Lakewood, CO 80228 | Oil & Gas Operator | Nov 2025 |
| 390 | Sovereign Operating Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2016 |
| 391 | Spellbound Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 392 | St Croix Operating Inc | | Oil & Gas Operator | Oct 2025 |
| 393 | Standley* Robert K Dba Otis Energy | | Oil Operator | Jan 2023 |
| 394 | Starlight Resources LLC | | Oil & Gas Operator | Apr 2006 |
| 395 | Stehle Oil Company | | Oil Operator | Jun 2021 |
| 396 | Stelbar Oil Corporation, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 397 | Stoneham Production LLC | | Oil & Gas Operator | Oct 2025 |
| 398 | Strachan Exploration Inc | Englewood, CO 80112 | Oil & Gas Operator | Oct 2025 |
| 399 | Summit Oil & Gas, LLC | | Oil & Gas Operator | Dec 2024 |
| 400 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Oct 2025 |