| Benson-Montin-Greer DrlActive | 100215 | Farmington | 5 | 2 |
| Beren Corporation | 100216 | Denver | 2 | 1 |
| Berge Exploration/Permitco | 100217 | Denver | 1 | 1 |
| Bermuda Exploration | 100218 | Dallas | 0 | 0 |
| Berry Petroleum Company | 100221 | Houston | 92 | 3 |
| Berry Petroleum Company LLCActive | 100222 | Bakersfield | 1,930 | 3 |
| Berry Ventures Inc | 100223 | Tulsa | 0 | 0 |
| BHP Petroleum (Americas) | 100224 | Houston | 5 | 3 |
| BHP Petroleum Company Inc | 100225 | Oklahoma City | 1 | 1 |
| Big Horn Powder River Corp | 100226 | — | 1 | 1 |
| Big Six Oil Co | 100227 | — | 2 | 1 |
| Big West Oil Company | 100228 | Brigham City | 0 | 0 |
| Bill Barrett Corp | 100229 | Denver | 0 | 0 |
| Bill Barrett Corp | 100230 | Denver | 0 | 0 |
| Bill Barrett Corp | 100231 | Denver | 210 | 7 |
| Bill Barrett Corp | 100232 | Denver | 0 | 0 |
| Bio Remedies Facility Inc | 100233 | Vernal | 0 | 0 |
| Birch Corporation | 100234 | Denver | 6 | 1 |
| Bishop Petroleum Corp | 100235 | Arvada | 1 | 1 |
| Bison Oil and Gas III, LLC | 105021 | Denver | 0 | 0 |
| Bison Operating Company LLC | 100236 | Tulsa | 1 | 1 |
| Bitter Creek Oil Co | 100237 | — | 1 | 1 |
| Black Dahlia Oil & Gas | 100238 | Salt Lake City | 1 | 1 |
| Black Dome Energy | 100239 | — | 2 | 1 |
| Black Gold Enterprises | 100240 | — | 2 | 1 |
| Black Hawk Resources | 100241 | — | 1 | 1 |
| Black Moon Resources LLC | 100242 | Richardson | 0 | 0 |
| Black Resources Inc | 100243 | Granbury | 0 | 0 |
| Blackjack Oil & Gas Inc | 100244 | Enid | 0 | 0 |
| Blackstone Minerals NV, LLCActive | 105441 | Las Vegas | 5 | 2 |
| Blackwood-Nichols Drlg Co | 100245 | — | 1 | 1 |
| Blaze #1 Partnership | 100246 | — | 0 | 0 |
| Blu Danube Oil Company | 100247 | Farmington | 1 | 1 |
| Blue Diamond Oil Corp | 100248 | Neola | 1 | 1 |
| Blue Tip Castlegate | 100249 | Houston | 0 | 0 |
| Blue Tip Castlegate, Inc | 100250 | Erie | 13 | 1 |
| Bluebell Oil Inc | 100251 | — | 1 | 1 |
| Bluff Oil Company | 100252 | — | 0 | 0 |
| Boardwalk Petroleum Inc | 100254 | — | 2 | 1 |
| Boekel, R G | 100256 | Denver | 1 | 1 |
| Bog Inc (Bowers) | 100257 | Grand Junction | 16 | 2 |
| Bolinder, Vern H | 100259 | Salt Lake City | 0 | 0 |
| Boneau, Frank | 100261 | — | 1 | 1 |
| Bonneville Fuels Corp | 100263 | Denver | 1 | 1 |
| Bonneville Oil & Gas Explo | 100264 | — | 1 | 1 |
| Bookcliff Operating Corp | 100265 | Vernal | 0 | 0 |
| Bookcliff Operating Inc | 100266 | Vernal | 0 | 0 |
| Bookcliff Petroleum Inc | 100267 | Denver | 3 | 1 |
| Border Fuel Supply Corp | 100268 | Englewood | 0 | 0 |
| Boswell Energy Corp | 100269 | Oklahoma City | 3 | 3 |
| Boulder Knoll Oil & Gas Co | 100270 | — | 1 | 1 |
| Bountiful Corporation | 100271 | Denver | 0 | 0 |
| Bow Valley Petroleum Inc | 100272 | Denver | 16 | 3 |
| Bowers Oil And Gas Inc | 100273 | Grand Junction | 2 | 2 |
| Boyd & McWilliams Energy | 100274 | Midland | 1 | 1 |
| BP America Production Co | 100275 | Houston | 1 | 1 |
| BP America Production Co | 100276 | Tulsa | 0 | 0 |
| BP Exploration Inc | 100277 | Houston | 0 | 0 |
| Brandly, Larry | 100278 | Denver | 0 | 0 |
| Bray, Oscar & Stubbs, Glade | 100279 | — | 1 | 1 |
| Brennan Bottom Disposal | 100280 | Roosevelt | 0 | 0 |
| Brent Explorations Inc | 100281 | Denver | 2 | 1 |
| Brewster-Bartle Drilling | 100282 | Houston | 1 | 1 |
| Bridge Oil Company LP | 100283 | Oklahoma City | 0 | 0 |
| Bridger Petroleum Corp | 100284 | Denver | 6 | 3 |
| Bridwell Oil Management Of | 100285 | Wichita Falls | 2 | 1 |
| Brinkerhoff Drilling Co | 100287 | — | 9 | 1 |
| British-American Oil Prod | 100288 | Denver | 1 | 1 |
| Brittish-American Petro Co | 100289 | — | 3 | 1 |
| Broadhead, M D | 100290 | — | 2 | 1 |
| Broadhead, Walter | 100291 | Grand Junction | 65 | 1 |
| Bronco Oil & Gas Co | 100292 | — | 1 | 1 |
| Brooks Hall Oil Corp | 100293 | — | 1 | 1 |
| Brown Brothers Land Co | 100294 | Greenwood Village | 0 | 0 |
| Brown San Juan Properties | 100295 | Artesia | 0 | 0 |
| Brown, George | 100296 | — | 1 | 1 |
| Brown, George Partnership | 100297 | Houston | 0 | 0 |
| Brown, Russell D | 100298 | Cortez | 5 | 1 |
| Brownlie, Wallace, Armstrong | 100299 | Denver | 0 | 0 |
| Bryce Canyon Oil Co | 100300 | — | 2 | 1 |
| BTA Oil Producers | 100301 | Midland | 5 | 2 |
| Buckhorn Petroleum | 100302 | — | 3 | 2 |
| Buffalo Petroleum Corp | 100303 | — | 2 | 1 |
| Bullion Monarch Co | 100304 | Salt Lake City | 1 | 1 |
| Bullock, Ben | 100305 | — | 1 | 1 |
| Bureau of Land Management | 100306 | Salt Lake City | 0 | 0 |
| Burke, Joseph E JR | 100307 | — | 1 | 1 |
| Burkhalter Engineering Inc | 100308 | Grand Junction | 0 | 0 |
| Burkhart, C R | 100309 | — | 2 | 1 |
| Burlington Northern | 100310 | — | 1 | 1 |
| Burlington Oil/Gas Co LP | 100311 | Farmington | 0 | 0 |
| Burlington Resources O&G | 100312 | Midland | 0 | 0 |
| Burnett Oil Co Inc | 100313 | Fort Worth | 2 | 1 |
| Burnett Oil Co Inc | 100314 | Fort Worth | 4 | 2 |
| Burnett Oil Co Inc | 100315 | Casper | 0 | 0 |
| Burnham Oil Company | 100316 | — | 8 | 1 |
| Burns | 100317 | — | 1 | 1 |
| Burr Oil & Gas | 100318 | Farmington | 1 | 1 |
| Burr, Joel B Jr | 100319 | Farmington | 0 | 0 |
| Burton/Hawks Inc | 100320 | Casper | 11 | 3 |
| Butler, Ed | 100321 | — | 1 | 1 |
| Buttes Gas & Oil Co | 100322 | — | 5 | 3 |
| Buzzards Bench, LLC | 104563 | Orangeville | 0 | 0 |
| Bwab Incorporated | 100323 | Denver | 9 | 3 |
| Byrd-Frost Inc | 100324 | — | 4 | 4 |
| Byron Oil Industries | 100325 | — | 1 | 1 |
| C & J Exploration Inc | 100326 | Edmond | 0 | 0 |
| C & K Petroleum Inc | 100327 | Denver | 0 | 0 |
| C C Co | 100328 | Holladay | 17 | 1 |
| C C Kissinger | 100329 | — | 0 | 0 |
| C K M Resources | 100330 | Sandy | 0 | 0 |
| C U T Energy Inc | 100331 | Roosevelt | 0 | 0 |
| C.S.V. Oil Exploration CoActive | 100549 | West Jordan | 5 | 1 |
| Cabeen Exploration Corp | 100332 | — | 4 | 1 |
| Cabot Corp | 100333 | — | 2 | 2 |
| Cabot Oil & Gas Corp | 100334 | Pittsburgh | 12 | 2 |
| Cache Valley Dairy Assoc | 100335 | — | 1 | 1 |
| Cache Valley Oil Assoc | 100336 | — | 1 | 1 |
| Cactus Drilling Corp | 100337 | — | 2 | 1 |
| Caerus Uinta, LLC | 105039 | Denver | 0 | 0 |
| Cal-Dak Minerals | 100338 | Salt Lake City | 0 | 0 |
| Caldwell & Covington | 100339 | — | 2 | 1 |
| Calif Oil & Refin Co | 100340 | — | 1 | 1 |
| California Co | 100341 | — | 3 | 2 |
| California Oil Co | 100342 | — | 12 | 3 |
| California Utah Oil Co | 100343 | — | 2 | 2 |
| California-Time Pet Co | 100344 | — | 1 | 1 |
| Callahan, George | 100345 | — | 1 | 1 |
| Callister, Allan | 100346 | — | 1 | 1 |
| Calloway, W O | 100347 | — | 2 | 1 |
| Caloco Energy Inc | 100348 | Dallas | 0 | 0 |
| Caltah Oil Co | 100349 | — | 5 | 1 |
| Calvert Exploration Co | 100350 | Fort Worth | 4 | 2 |
| Camay Drilling Company | 100351 | Denver | 1 | 1 |
| Campbell, G S | 100352 | Park City | 3 | 2 |
| Cane Creek Oil Co | 100353 | — | 1 | 1 |
| CannonActive | 100355 | Grand Junction | 4 | 1 |
| Cannon, Donald | 100354 | Vernal | 0 | 0 |
| Cantrell & Florence | 100356 | Farmington | 1 | 1 |
| Canyon Gas Resources, Inc | 100357 | Grand Junction | 0 | 0 |
| Canyon Gas Resources, Inc | 100358 | Grand Junction | 0 | 0 |
| Cap Energy LLC | 104384 | Greeley | 1 | 1 |
| Capitol Operating Group, LLCActive | 104393 | Lafayette | 19 | 1 |
| Carbon Dioxide and Chem Co | 100360 | — | 4 | 1 |
| Carbon Emery Producers | 100361 | — | 2 | 1 |
| Carbon Energy Corp (USA) | 100362 | Denver | 0 | 0 |
| Carbonit Exploration | 100363 | Denver | 2 | 1 |
| Carmack Drilling | 100364 | Grand Junction | 19 | 3 |
| Carns, Don R | 100365 | Grand Junction | 0 | 0 |
| Carrol, J A | 100366 | — | 1 | 1 |
| Cart, S H | 100367 | — | 0 | 0 |
| Carter Oil Co | 100368 | — | 21 | 6 |
| Castledale Oil Co | 100369 | — | 3 | 2 |
| Castlegate Resources LLC | 100370 | Allen | 0 | 0 |
| Cat Oil Company | 100371 | Vernal | 2 | 1 |
| Catfish Minerals LLC | 100372 | Dallas | 0 | 0 |
| Cathedral Gas | 100373 | Rangely | 0 | 0 |
| Catron, Harriet J | 100374 | San Francisco | 0 | 0 |
| Caulkins Oil Co | 100375 | — | 1 | 1 |
| CBM Production LLC | 100376 | Ephraim | 1 | 1 |
| CDX Gas LLC | 100377 | Houston | 0 | 0 |
| CDX Rockies LLC | 100378 | Houston | 4 | 1 |
| Cedar Mountain Gas LLC | 100379 | Oklahoma City | 2 | 1 |
| Celeron Oil & Gas Co | 100380 | Lafayette | 1 | 1 |
| Celsius Energy Company | 100381 | Denver | 10 | 5 |
| Celtic Resources LLC | 100382 | Boulder | 0 | 0 |
| Cenergy Exploration | 100383 | Dallas | 2 | 1 |
| Central Basin Infrastrcture Partners, LLC | 104986 | Ballard | 1 | 1 |
| Central Resources Inc | 100384 | Farmington | 0 | 0 |
| Central Utah Gas & Oil Co | 100385 | — | 1 | 1 |
| Century Drilling Company | 100386 | Tulsa | 1 | 1 |
| Century Exploration Co | 100387 | Tulsa | 1 | 1 |
| Century Oil & Gas Corp | 100388 | Englewood | 1 | 1 |
| CH4-Finley Operating, LLC | 104812 | Fort Worth | 0 | 0 |
| Chambers & Kennedy | 100390 | Midland | 1 | 1 |
| Chambers, Jerry Explor | 100391 | Denver | 5 | 2 |
| Champion Oil Co | 100392 | — | 1 | 1 |
| Champlin Petroleum Co | 100393 | Rock Springs | 32 | 6 |
| Chandler & Associated Inc | 100394 | Denver | 39 | 6 |
| Charles E King | 100395 | — | 2 | 1 |
| Charles E Walden | 100396 | — | 1 | 1 |
| Chase B M P Enterprises | 100397 | Salt Lake City | 0 | 0 |
| Chase, Louis A | 100398 | Beverly Hills | 0 | 0 |
| Chase-Grossman | 100399 | — | 0 | 0 |
| Chasel Energy | 100400 | Park City | 4 | 2 |
| Chasel, Doug | 105215 | — | 0 | 0 |
| Chasel, John D | 100401 | Park City | 1 | 1 |
| Chemical Oil Corp | 100402 | — | 5 | 1 |
| Chesapeake Operating LLC | 100403 | Oklahoma City | 1 | 1 |
| Chevron Oil Company | 100404 | — | 0 | 0 |
| Chevron USA Inc | 100405 | Evanston | 0 | 0 |
| Chevron USA Inc | 100406 | Orangeville | 0 | 0 |
| Chevron USA Inc | 100407 | Houston | 194 | 17 |
| Chiaretta, Jack | 100408 | Price | 0 | 0 |
| Chief Oil & Gas LLC | 100409 | Dallas | 1 | 1 |
| Chieftain Intl (US) Inc | 100410 | Calgary, Alberta | 0 | 0 |
| Chieftain Intl Inc | 100411 | — | 1 | 1 |
| Chipeta Processing, LLCActive | 100412 | Denver | 0 | 0 |
| Chorney Oil Co | 100414 | Denver | 3 | 3 |
| Christensen, Chris L | 100415 | Denver | 0 | 0 |