| 201 | Northstar Gas Company Of Texas | Houston, TX 77057-2768 | Oil & Gas Operator | Jan 2016 |
| 202 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 203 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 204 | Onshore Royalties LLC | Houston, TX 77269 | Oil & Gas Operator | Mar 2025 |
| 205 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 206 | P & M Petroleum Management | Denver, CO BAD ADDR | Oil & Gas Operator | Apr 2010 |
| 207 | P-2 Oil | Vernal, UT 84078 | Oil & Gas Operator | Jul 2000 |
| 208 | Pacific Natural Gas Explor | | Oil & Gas Operator | Dec 1974 |
| 209 | Pacific Trans Supply | Vernal, UT 84078 | Oil & Gas Operator | Jul 1987 |
| 210 | Page Petroleum Inc | Calgary, AB T2P3M-3000 | Oil & Gas Operator | Nov 1998 |
| 211 | Paiute Oil & Mining Corp | Salt Lake City, UT 84117 | Oil & Gas Operator | Jun 1989 |
| 212 | Pan American Petroleum Cor | | Oil & Gas Operator | Dec 1981 |
| 213 | Pannonian Energy Inc | Englewood, CO 80112 | Oil & Gas Operator | Mar 2004 |
| 214 | Pendragon Energy Partners Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2009 |
| 215 | Pennzoil Company | Midland, TX 79710-0090 | Oil & Gas Operator | Mar 2000 |
| 216 | Pennzoil Explor & Prod Co | Houston, TX 77002 | Oil & Gas Operator | Mar 2000 |
| 217 | Petro-X Corporation | Houston, TX 77092 | Oil & Gas Operator | Jul 2002 |
| 218 | Petroglyph Operating Co | Boise, ID 83709 | Oil & Gas Operator | Jul 2017 |
| 219 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 220 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 221 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 222 | Phoenix Hydro Oper Corp | Midland, TX 79702 | Oil & Gas Operator | Dec 1993 |
| 223 | Phoenix Hydrocarbons Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 1993 |
| 224 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jan 2025 |
| 225 | PO&G Operating, LLC (Pogo) | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 226 | Polumbus Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1982 |
| 227 | Post Petroleum Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2013 |
| 228 | Priority Oil & Gas LLC | Lakewood, CO 80227 | Gas Operator | Dec 2019 |
| 229 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2025 |
| 230 | Qep Uinta Basin Inc | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2007 |
| 231 | Questar Expl. And Prod. Co. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jul 2011 |
| 232 | Quinex Energy Corp | Bountiful, UT 84010 | Oil & Gas Operator | Mar 2025 |
| 233 | Quintana Petroleum Corporation | Denver, CO 80265 | Oil & Gas Operator | Mar 1998 |
| 234 | Ranken Energy Corporation | Edmond, OK 73013 | Oil & Gas Operator | Feb 2025 |
| 235 | Retamco Operating Inc | Red Lodge, MT 59068 | Oil & Gas Operator | Mar 2025 |
| 236 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Feb 2025 |
| 237 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | May 2025 |
| 238 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 239 | Road Runner Inc | Park City, UT 84060 | Oil & Gas Operator | Aug 2005 |
| 240 | Robert L Bayless Producer, LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 241 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 242 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 243 | Ross Exploration,Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2013 |
| 244 | Royale Energy Inc | San Diego, CA 92108-4518 | Oil & Gas Operator | Mar 2025 |
| 245 | S O Utah | Irvine, CA 92715 | Oil & Gas Operator | Sep 1994 |
| 246 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 247 | Santa Fe Energy Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 248 | Santa Fe Snyder Corporation | Houston, TX 77024 | Oil & Gas Operator | Oct 2000 |
| 249 | Sapient Energy Corp | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2002 |
| 250 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 251 | Sep Nosr LLC | Orem, UT 84097 | Oil & Gas Operator | Mar 2025 |
| 252 | Sfeop | Midland, TX 79701 | Oil & Gas Operator | Mar 1994 |
| 253 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 254 | Shenandoah Energy Inc | Denver, CO 80265-1050 | Oil & Gas Operator | Dec 2014 |
| 255 | Shiny One Operating Company, LLC | Vernal, UT 84078 | Oil & Gas Operator | Mar 2025 |
| 256 | Sinclair Oil & Gas Company | Salt Lake Cty, UT 84130 | Oil & Gas Operator | May 2025 |
| 257 | Skyline Oil Company | Salt Lake City, UT 84111 | Oil & Gas Operator | Jan 1987 |
| 258 | Slate River Resources LLC | Denver, CO 80293 | Oil & Gas Operator | Apr 2008 |
| 259 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 260 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 261 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 262 | Sohio Petroleum Co. | Casper, WY 82602 | Oil & Gas Operator | Apr 1986 |
| 263 | Standard Oil Co Of Calif | | Oil & Gas Operator | Dec 1983 |
| 264 | Stewart Petroleum Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Dec 2023 |
| 265 | Stone, D J | Palo Alto, CA 94301 | Oil & Gas Operator | Sep 1985 |
| 266 | Summit Operating LLC | Boulder, CO 80301 | Oil & Gas Operator | Mar 2025 |
| 267 | Sun Explor & Production Co | Oklahoma City, OK 73126 | Gas Operator | Oct 1984 |
| 268 | Sun Oil Company | Arlington, TX 76006 | Oil & Gas Operator | Dec 2021 |
| 269 | Sunray DX Oil Co | | Gas Operator | Dec 1983 |
| 270 | Swepi/Western Division | Houston, TX 77210 | Oil & Gas Operator | Aug 1984 |
| 271 | Swevco-Sabw LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 272 | Tamarack Energy Inc | Midland, TX 79701 | Oil & Gas Operator | Dec 2015 |
| 273 | TCC Royalty Corporation | Centennial, CO 80112 | Gas Operator | Sep 2005 |
| 274 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Feb 2025 |
| 275 | Teton Energy Co Inc | Denver, CO 80239 | Oil Operator | Dec 1983 |
| 276 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | May 2025 |
| 277 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 278 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 279 | Texas American Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 280 | Texas Eastern Skyline Oil | Houston, TX 77252 | Oil & Gas Operator | Jan 1987 |
| 281 | Thurston Energy Operating | Vernal, UT 84078 | Oil & Gas Operator | Dec 2015 |
| 282 | Tiger Energy Operating, LLC | Los Angeles, CA 90025 | Oil & Gas Operator | Jun 2019 |
| 283 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 284 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Apr 2025 |
| 285 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |
| 286 | Uinta Oil & Gas | Roosevelt, UT 84066 | Oil & Gas Operator | Nov 1997 |
| 287 | Uinta Wax Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 288 | Uinta-Taylor Fund, LTD | Roosevelt, UT 84066 | Oil & Gas Operator | Nov 2018 |
| 289 | Uintah Investors LLC | Vernal, UT 84078 | Oil & Gas Operator | Mar 2025 |
| 290 | Ultra Resources Inc | Houston, TX 77060 | Oil & Gas Operator | Sep 2018 |
| 291 | Umc Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 292 | Union Oil Co Of California | Midland, TX 79706 | Oil & Gas Operator | Jan 2022 |
| 293 | Union Pacific Resources Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Sep 2002 |
| 294 | United Utilities Corporation | Conroe, TX 77301 | Oil & Gas Operator | Oct 1998 |
| 295 | Universal Resources Corp. | Salt Lake Cty, UT 84145 | Oil & Gas Operator | Jan 2000 |
| 296 | Utah Gas Op LTD | Rangely, CO 81648 | Oil & Gas Operator | Mar 2025 |
| 297 | Utah-Westar DRL Ventures | Dallas, TX 75201 | Oil & Gas Operator | Nov 1987 |
| 298 | Ute Energy Upstream Holdings LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2012 |
| 299 | Utex Oil Company | Elko, NV 89803 | Oil & Gas Operator | Dec 1988 |
| 300 | Valley Operating Inc | Denver, CO 80218-3633 | Oil & Gas Operator | Jan 2004 |