The largest oil and gas operators active in Wyoming — ranked by total well count, with producing-well counts for each. Click any operator to see their full profile.
Buckhead Energy analysis of public oil and gas data. Refreshed daily. Data current as of 2026-11-01.
Quick answer: By wells operated, EOG Resources is the largest oil and gas operator in Wyoming with 13,431 wells on record, followed by Anadarko Petroleum (7,252) and Devon Energy Production Company (6,180). Ranked from Buckhead Energy analysis of public oil and gas data (as of 2026-11-01). This is an operated-well-count ranking, not a revenue or market-cap ranking.
As of 2026-11-01, the largest operator by wells on record in Wyoming is Eog Resources with 13,431 wells on record, across the top 100 ranked operators, per Buckhead Energy analysis of public oil and gas data.
| # | Operator | Wells | Producing | Top Formation | Top County |
|---|---|---|---|---|---|
| 1 | Eog Resources | 13,431 | 1,881 | Niobrara- Mowry | Campbell |
| 2 | Anadarko Petroleum | 7,252 | 523 | Niobrara- Mowry | Converse |
| 3 | Devon Energy Production Company | 6,180 | 1,986 | Niobrara- Mowry | Campbell |
| 4 | Anschutz Exploration | 6,175 | 397 | Powder River Basin | Campbell |
| 5 | Lance Oil & Gas Company | 4,038 | 2,309 | Niobrara- Mowry | Campbell |
| 6 | Carbon Creek Energy | 3,828 | 3,785 | Powder River Basin | Johnson |
| 7 | Purewest Resources INC | 3,797 | 3,530 | Mesaverde-Lance | Sublette |
| 8 | Pennaco Energy Incorporated | 3,713 | 2,519 | Powder River Basin | Campbell |
| 9 | Wold Energy Partners | 3,680 | <3 | Niobrara- Mowry | Converse |
| 10 | Crowheart Energy | 3,634 | 3,340 | Mesaverde-Lance-Lewis | Sweetwater |
| 11 | Contango Resources Company | 3,129 | 2,645 | Niobrara- Mowry | Natrona |
| 12 | Yates Petroleum | 3,017 | 1,618 | Niobrara- Mowry | Campbell |
| 13 | Huber J M | 3,004 | 1,695 | Powder River Basin | Sheridan |
| 14 | Jonah Energy | 2,950 | 2,525 | Mesaverde-Lance | Sublette |
| 15 | Williams Production Gulf Coast | 2,616 | 1,132 | Powder River Basin | Campbell |
| 16 | Samson Resources Company | 2,575 | 179 | Niobrara- Mowry | Converse |
| 17 | Fdl Operating | 2,514 | 948 | Niobrara- Mowry | Natrona |
| 18 | Wrc Energy LLC | 2,453 | 261 | Niobrara- Mowry | Campbell |
| 19 | Merit Energy Company | 2,382 | 2,067 | Big Horn Basin | Park |
| 20 | Atx Energy Partners | 2,040 | 10 | Powder River Basin | Johnson |
| 21 | Bpx Operating Company | 2,005 | 393 | Mesaverde-Lance-Lewis | Sweetwater |
| 22 | Hilcorp Energy Company | 1,916 | 1,872 | Hilliardbaxtermancos-Niobrara | Lincoln |
| 23 | Noble Energy | 1,897 | 15 | Mesaverde-Lance-Lewis | Johnson |
| 24 | Continental Resources | 1,889 | 694 | Niobrara- Mowry | Converse |
| 25 | Wave Petroleum Operating | 1,860 | 3 | Muddy J Sand | Laramie |
| 26 | Barrett Resources | 1,678 | 1,364 | Niobrara- Mowry | Campbell |
| 27 | Davis Oil Company | 1,678 | 60 | Powder River Basin | Campbell |
| 28 | Seven Sisters Oil & Gas | 1,626 | <3 | Powder River Basin | Campbell |
| 29 | Ballard Petroleum Holdings | 1,602 | 198 | Powder River Basin | Johnson |
| 30 | Marathon Oil Company | 1,566 | 375 | Big Horn Basin | Hot Springs |
| 31 | Pronghorn Operating | 1,488 | 1,463 | Powder River Basin | Johnson |
| 32 | Pine Haven Resources | 1,476 | 142 | Niobrara- Mowry | Campbell |
| 33 | Conocophillips Company | 1,447 | 146 | Niobrara- Mowry | Converse |
| 34 | Anschutz Oil Company | 1,442 | <3 | Niobrara- Mowry | Campbell |
| 35 | Gungnir Operating LLC | 1,422 | 0 | Codell-Niobrara | Goshen |
| 36 | True Oil | 1,421 | 345 | Niobrara- Mowry | Campbell |
| 37 | Urban Oil & Gas Group | 1,395 | 1,376 | Hilliardbaxtermancos-Niobrara | Sublette |
| 38 | Titan Exploration | 1,349 | 11 | Niobrara- Mowry | Campbell |
| 39 | Sage Butte Prb Operating, LLC | 1,339 | 119 | Niobrara- Mowry | Converse |
| 40 | C M S Oil And Gas Company | 1,327 | 738 | Powder River Basin | Campbell |
| 41 | Pinnacle Gas Resources | 1,326 | 583 | Powder River Basin | Campbell |
| 42 | Green Reserve Energy Holdings LLC | 1,217 | 1,004 | Niobrara- Mowry | Natrona |
| 43 | Grayson Mill Operating | 1,199 | <3 | Niobrara- Mowry | Converse |
| 44 | Wexpro Company | 1,134 | 732 | Mesaverde-Lance-Lewis | Sweetwater |
| 45 | Wamsutter E And P LLC | 1,118 | 18 | Mesaverde-Lance-Lewis | Sweetwater |
| 46 | Bill Barrett | 1,100 | 506 | Niobrara- Mowry | Campbell |
| 47 | Impact Exploration Company | 1,088 | 4 | Niobrara- Mowry | Converse |
| 48 | Navigation Powder River | 1,073 | 17 | Niobrara- Mowry | Campbell |
| 49 | Kennedy Oil | 1,016 | 738 | Powder River Basin | Campbell |
| 50 | Prima Oil & Gas Company | 1,004 | 621 | Powder River Basin | Campbell |
| 51 | Fidelity Exploration & Production Company | 962 | 535 | Powder River Basin | Sheridan |
| 52 | Century Oil & Gas | 960 | 14 | Niobrara- Mowry | Niobrara |
| 53 | Red Stone Resources | 954 | 539 | Powder River Basin | Campbell |
| 54 | Citation Oil & Gas | 943 | 766 | Big Horn Basin | Campbell |
| 55 | North Silo Resources LLC | 925 | 59 | Muddy J Sand | Laramie |
| 56 | M & K Oil Company | 904 | 869 | Niobrara- Mowry | Weston |
| 57 | Denbury Onshore | 887 | 775 | Niobrara- Mowry | Campbell |
| 58 | Redstone Gas Partners | 819 | 430 | Powder River Basin | Johnson |
| 59 | Ultra Resources | 815 | 8 | Mesaverde-Lance | Sublette |
| 60 | Southland Royalty Company | 778 | 12 | Mesaverde-Lance-Lewis | Sweetwater |
| 61 | Nance Petroleum | 773 | 505 | Powder River Basin | Sheridan |
| 62 | Peak Powder River Resources | 750 | 108 | Niobrara- Mowry | Campbell |
| 63 | Black Diamond Energy | 732 | 225 | Powder River Basin | Johnson |
| 64 | Chevron | 710 | 241 | Green River Basin | Sublette |
| 65 | Chesapeake Energy | 695 | 5 | Niobrara- Mowry | Converse |
| 66 | North Finn | 641 | 234 | Powder River Basin | Campbell |
| 67 | Osage Partners | 636 | 381 | Powder River Basin | Weston |
| 68 | Howell Petroleum | 625 | 202 | Niobrara- Mowry | Natrona |
| 69 | Breitburn Operating | 607 | 577 | Hilliardbaxtermancos-Niobrara | Sweetwater |
| 70 | Shell Oil Company | 565 | 8 | Mesaverde-Lance | Sublette |
| 71 | Longs Peak Resources | 563 | 8 | Muddy J Sand | Laramie |
| 72 | Bright Rock Energy LLC | 541 | 0 | Niobrara- Mowry | Converse |
| 73 | Rim Operating | 537 | 375 | Niobrara- Mowry | Campbell |
| 74 | Encana Oil & Gas | 536 | 58 | Mesaverde-Lance | Sublette |
| 75 | Amoco Production Company | 528 | 311 | Mesaverde-Lance-Lewis | Sweetwater |
| 76 | Westport Oil & Gas Company | 518 | 263 | Niobrara- Mowry | Campbell |
| 77 | Rockies Resources Holdings | 517 | 30 | Mesaverde-Lance-Lewis | Sweetwater |
| 78 | Cassidy American Resources LLC | 517 | 0 | Niobrara- Mowry | Johnson |
| 79 | Elephant Operating | 508 | <3 | Niobrara- Mowry | Converse |
| 80 | Atlantic Richfield Company | 500 | 21 | Green River Basin | Sweetwater |
| 81 | Windsor Energy Group | 497 | 309 | Powder River Basin | Johnson |
| 82 | Exxon Mobil | 486 | 70 | Niobrara- Mowry | Sublette |
| 83 | Petrocanada Resources | 476 | 186 | Powder River Basin | Campbell |
| 84 | Comet Energy Services | 449 | 137 | Powder River Basin | Campbell |
| 85 | Sunshine Valley Petroleum | 446 | 398 | Niobrara- Mowry | Weston |
| 86 | Martens & Peck Operating Company | 443 | <3 | Niobrara- Mowry | Campbell |
| 87 | Phillips Petroleum Company | 439 | 146 | Niobrara- Mowry | Campbell |
| 88 | Rki Exploration & Production | 430 | 8 | Niobrara- Mowry | Converse |
| 89 | Coleman Oil & Gas | 430 | 236 | Niobrara- Mowry | Campbell |
| 90 | Wesco Operating | 408 | 308 | Wind River Basin | Fremont |
| 91 | Texaco Exploration And Production | 379 | 88 | Powder River Basin | Sweetwater |
| 92 | Amplify Energy Operating | 377 | 285 | Green River Basin | Sweetwater |
| 93 | Continental Industries LC | 373 | 172 | Powder River Basin | Sheridan |
| 94 | Matrix Production Company | 370 | 366 | Niobrara- Mowry | Converse |
| 95 | Eme Wyoming LLC | 362 | 0 | Codell-Niobrara | Goshen |
| 96 | Emep Ii Operating LLC | 353 | 238 | Niobrara- Mowry | Campbell |
| 97 | Ch4 Energy | 347 | 229 | Powder River Basin | Campbell |
| 98 | Midgard Energy Company | 344 | 60 | Niobrara- Mowry | Campbell |
| 99 | Richardson Operating Company | 329 | 234 | Wind River Basin | Fremont |
| 100 | Big Basin Petroleum | 326 | 197 | Powder River Basin | Campbell |
Source: Buckhead Energy analysis of public oil and gas data.
Ranking: Operators ranked by total well count under their current operator-of-record. Producing-well count is wells with a first-production date on file. Drilling activity (permits, spuds, DUCs) is published only as state and county counts, never attributed to an operator.
Why it matters: Knowing who operates the most wells in Wyoming helps mineral owners understand who they're dealing with at the lease level.
Refresh cadence: Daily. Data current as of 2026-11-01.
By wells operated, EOG Resources is the largest oil and gas operator in Wyoming, with 13,431 wells on record per Buckhead Energy analysis of public oil and gas data. Note that "biggest" by revenue or market capitalization can rank differently — this measures operated well count.
The top 10 operators by operated well count are: EOG Resources, Anadarko Petroleum, Devon Energy Production Company, Anschutz Exploration, Lance Oil & Gas Company, Carbon Creek Energy, Purewest Resources Inc., Pennaco Energy Incorporated, Wold Energy Partners, Crowheart Energy. The full top-100 ranking with well and producing-well counts is in the leaderboard below.
EOG Resources operates the most wells in Wyoming at 13,431, per Buckhead Energy analysis of public oil and gas data.
This leaderboard ranks the top 100 operators active in Wyoming by total well count. Many more file with the regulator; these are the largest by operated wells.
By wells operated — the count of wells under each company's current operator-of-record designation in the public oil and gas data Buckhead Energy analyzes. It is not a revenue, production-volume, or market-capitalization ranking.
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Operators ranked: 100
Total wells: 154,516
Last refresh: 2026-11-01
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