Ranked by well count (computed by Valor from public oil and gas data), the largest operators across California, Pennsylvania, Texas, New Mexico, Oklahoma, Illinois, Louisiana, North Dakota, Colorado, Kansas, Mississippi, Ohio, Michigan, Alabama, Wyoming, Kentucky, Arkansas, Utah, New York, West Virginia, Montana, Nebraska, and Missouri are Chevron, Diversified Production LLC, and Aera Energy. The table below ranks the top 100 operators by the number of wells they operate, as of 2026-10-06. Each links to its full profile — permits, top-producing wells, and contact details.
Coverage: California, Pennsylvania, Texas, New Mexico, Oklahoma, Illinois, Louisiana, North Dakota, Colorado, Kansas, Mississippi, Ohio, Michigan, Alabama, Wyoming, Kentucky, Arkansas, Utah, New York, West Virginia, Montana, Nebraska, and Missouri, where well-level operator records are complete. Well count is a footprint measure; producing wells and 12-month volumes reflect current output. Absorbed legacy names (Anadarko, Burlington, Texaco, etc.) are excluded so a company isn’t double-counted under both its current and former names.
Source: Valor analysis of public oil and gas data. Statistics are published on this page; no bulk download is offered.
| Rank | Operator | Wells | Producing | State | Top County | Top Formation |
|---|---|---|---|---|---|---|
| 1 | Chevron | 75,597 | 44,090 | CA, CO, LA, ND, NE, NM, OH, OK, TX, WV, WY | Kern | Kern River |
| 2 | Diversified Production LLC | 59,894 | 58,354 | AL, KY, LA, OH, OK, PA, TX, VA, WV | Indiana | Marcellus |
| 3 | Aera Energy | 57,844 | 39,151 | CA | Kern | Monterey-Temblor |
| 4 | Hilcorp Energy Company | 54,002 | 48,987 | AK, AL, CO, LA, NM, OH, PA, TX, WY | San Juan | Pictured Clliffs |
| 5 | EOG Resources | 38,681 | 16,871 | KS, LA, MS, ND, NM, OH, OK, PA, TX, UT, WY | Lea | Niobrara- Mowry |
| 6 | Oxy | 34,757 | 25,966 | CA, CO, KS, LA, NM, NY, OK, TX, VA | Yoakum | Permian Basin |
| 7 | Exxon Mobil | 20,760 | 4,844 | CA, IL, KS, LA, ND, OK, TX, WY | Fayette | Gulf Coast Basin (La - Tx) |
| 8 | Pioneer Natural Resources | 20,633 | 16,669 | KS, LA, TX | Midland | Thirty-One Carbonate-Chert |
| 9 | Scout Energy Management | 18,780 | 16,916 | CO, KS, ND, NM, OK, TX, UT | Crockett | Thirty-One Carbonate-Chert |
| 10 | XTO Energy | 18,144 | 11,019 | AR, KS, LA, ND, NM, OK, PA, TX, UT, WV, WY | Eddy | Avalon-Bone Spring |
| 11 | Devon Energy Production Company | 18,108 | 8,760 | KS, LA, NM, OK, TX, WY | Campbell | Niobrara- Mowry |
| 12 | Apache | 16,976 | 10,626 | AZ, KY, LA, ND, NM, OK, TX | Glasscock | Thirty-One Carbonate-Chert |
| 13 | Chesapeake Energy | 16,803 | 4,110 | AR, KS, KY, LA, NY, OH, OK, PA, TX, WY | Woods | Anadarko Basin |
| 14 | California Resources Production | 16,702 | 10,361 | CA | Kern | Monterey-Temblor |
| 15 | Conocophillips Company | 15,407 | 5,206 | AK, CA, KS, LA, MO, MT, ND, NM, OK, TX, UT, WY | Beechey Point | Kuparuk River Kuparuk Riv Oil |
| 16 | Shell Oil Company | 15,208 | 1,866 | CA, IL, KS, KY, LA, MI, MO, MT, ND, NM, NY, OK, PA, TX, WY | Hamilton | Antrim |
| 17 | Citation Oil & Gas | 15,042 | 8,084 | CO, IL, KS, MT, ND, NM, OK, TX, UT, WY | Carter | Woodford |
| 18 | Diamondback Energy | 13,969 | 12,296 | TX | Martin | Wolfcamp D |
| 19 | Bpx Operating Company | 12,761 | 6,753 | CA, KS, LA, MI, NM, OK, TX, WY | De Witt | Prudhoe Bay |
| 20 | Berry Petroleum Company | 11,509 | 7,750 | CA, KY, TX, UT | Kern | Monterey-Temblor |
| 21 | Basa Resources | 11,455 | 11,106 | OK, TX | Gregg | Travis Peak |
| 22 | Bcemach III LLC | 11,426 | 10,580 | KS, NM, OK, TX | Mitchell | Granite Wash |
| 23 | Enervest Operating | 11,228 | 8,332 | LA, MI, OH, OK, PA, TX, VA | Union | Berea-Murrysville |
| 24 | Merit Energy Company | 11,138 | 9,172 | AR, CA, KS, LA, MI, OK, TX, WY | Hidalgo | Vicksburg |
| 25 | Sentinel Peak Resources Ca | 10,944 | 7,768 | CA | Kern | Monterey-Temblor |
| 26 | Continental Resources | 9,687 | 6,491 | IL, KY, LA, MT, ND, OK, TX, WY | Converse | Bakken |
| 27 | EQT Production Company | 9,469 | 5,491 | KY, PA, VA, WV | Greene | Marcellus |
| 28 | Crescent Energy Operating, LLC | 9,406 | 9,011 | TX, UT | Andrews | San Andres |
| 29 | TEP Rocky Mountain | 9,046 | 7,325 | CO | Garfield | Mesaverde |
| 30 | PDC Energy | 8,937 | 6,929 | CO, TX | Weld | Muddy J Sand |
| 31 | Burk Royalty | 8,925 | 8,497 | NM, OK, TX, WY | Moore | Granite Wash |
| 32 | COG Operating | 8,465 | 6,174 | NM, TX | Upton | Avalon-Bone Spring |
| 33 | Eiger Operating Company, LLC | 7,670 | 7,173 | KS, OK | Grant | Chase |
| 34 | Southern Community | 7,453 | 2,661 | AR, CA, IL, KS, KY, LA, MS, ND, OH, OK, TN, TX | Los Angeles | Forest City Basin |
| 35 | Upp Operating LLC | 7,411 | 7,335 | TX | Sutton | Ozona Canyon |
| 36 | Ows Acquisition Co LLC | 7,267 | 7,239 | OH, PA, WV | Stark | Utica |
| 37 | Formentera Operations LLC | 7,036 | 6,605 | LA, MS, ND, OK, TX | Ector | Thirty-One Carbonate-Chert |
| 38 | Riverside Energy Michigan | 6,980 | 6,489 | MI | Otsego | Antrim |
| 39 | Ovintiv USA Inc | 6,805 | 4,057 | OK, TX, UT, WY | Martin | Mesaverde-Wasatch |
| 40 | Urban Oil & Gas Group | 6,682 | 6,280 | AL, AR, IL, KS, LA, OK, TX, UT, WY | Tuscaloosa | Pottsville Coal Interval |
| 41 | Mewbourne Oil Company | 6,627 | 4,742 | NM, OK, TX | Eddy | Avalon-Bone Spring |
| 42 | Anschutz Exploration | 6,597 | 528 | CO, ND, UT, WY | Campbell | Niobrara- Mowry |
| 43 | Kinder Morgan Production | 6,267 | 5,024 | TX | Scurry | Thirty-One Carbonate-Chert |
| 44 | California Resources Elk Hills LLC | 6,153 | 5,353 | CA | Kern | Monterey-Temblor |
| 45 | Coterra Energy Inc | 6,130 | 3,937 | NM, OK, PA, TX | Susquehanna | Avalon-Bone Spring |
| 46 | Qb Energy Operating LLC | 6,118 | 5,209 | CO | Garfield | Mesaverde |
| 47 | Denbury Onshore | 5,755 | 4,251 | AL, LA, MS, MT, ND, TX, WY | Jasper | Niobrara- Mowry |
| 48 | Rj Energy | 5,579 | 3,579 | KS | Anderson | Forest City Basin |
| 49 | Samson Resources Company | 5,458 | 1,093 | LA, ND, OK, TX, WY | Laramie | Niobrara- Mowry |
| 50 | Carbon Creek Energy | 5,316 | 5,248 | WY | Johnson | Niobrara |
| 51 | Pocahontas Gas | 5,301 | 4,733 | VA, WV | Buchanan | Marcellus |
| 52 | R2q Operating | 5,132 | 4,883 | TX | Wichita | Barnett |
| 53 | Texas Petroleum Investment Company | 5,000 | 4,333 | LA, MS, TX | Guadalupe | Austin Chalk |
| 54 | Permian Resources Operating LLC | 4,855 | 3,743 | NM, TX | Reeves | Avalon-Bone Spring |
| 55 | Minard Run Oil Company | 4,787 | 2,247 | PA | Forest | Utica |
| 56 | Sun Explorationproduction Company | 4,588 | 426 | CA, KY, LA, ND, TX | Starr | Gulf Coast Basin (La - Tx) |
| 57 | Range Resources | 4,465 | 2,205 | OH, PA | Washington | Marcellus |
| 58 | BKV Barnett LLC | 4,444 | 4,395 | TX | Wise | Barnett |
| 59 | Kentucky West Virginia Gas Company | 4,396 | 2,355 | KY | Pike | Berea-Murrysville |
| 60 | Colt Energy | 4,362 | 2,111 | KS, MO | Allen | Excello-Mulky |
| 61 | Blackbeard Operating | 4,270 | 3,626 | OK, TX | Crane | Thirty-One Carbonate-Chert |
| 62 | E & B Natural Resources Management | 4,225 | 2,838 | CA, KS, WY | Kern | San Joaquin Basin |
| 63 | Whiting Petroleum Corp | 4,190 | 2,601 | MI, MT, ND, NM, OK, TX | Mountrail | Bakken |
| 64 | Tidelands Oil Production Company | 4,177 | 1,654 | CA | Los Angeles | Monterey |
| 65 | Simcoe LLC | 4,099 | 3,778 | CO, NM | San Juan | Pictured Clliffs |
| 66 | Lance Oil & Gas Company | 4,083 | 2,332 | WY | Campbell | Niobrara- Mowry |
| 67 | Eagleridge Operating | 4,022 | 3,920 | TX | Hood | Barnett |
| 68 | Pa Gen Energy | 4,007 | 924 | PA | Lycoming | Appalachian Basin - (Eastern Overthrust Area) |
| 69 | Waggoner Operating,LLC | 4,003 | 3,831 | TX | Wichita | Palo Duro Basin |
| 70 | Flywheel Energy Production LLC | 3,963 | 3,937 | AR | Van Buren | Fayetteville |
| 71 | Own Resources Operating | 3,951 | 3,889 | CO, KS | Yuma | Niobrara East |
| 72 | Two P Partners LLC | 3,895 | 3,206 | TX | Ward | Thirty-One Carbonate-Chert |
| 73 | Contango Resources Company | 3,838 | 3,100 | MT, OK, TX, WY | Natrona | Niobrara- Mowry |
| 74 | Purewest Resources Inc | 3,792 | 3,530 | WY | Sublette | Mesaverde-Lance |
| 75 | Witco | 3,770 | 65 | PA | Mc Kean | Appalachian Basin - (Eastern Overthrust Area) |
| 76 | Koda Gnb, LLC | 3,739 | 3,314 | UT | Uintah | Mesaverde-Wasatch |
| 77 | Highmark Energy Operating | 3,724 | 3,417 | LA, MS, OK, TX | Montgomery | Cotton Valley |
| 78 | Pennaco Energy Incorporated | 3,715 | 2,520 | WY | Campbell | Niobrara |
| 79 | Columbia Gas Transmission | 3,704 | 305 | KY, NY, OH, PA, WV | Hocking | Utica |
| 80 | Ashland Oil & Refining | 3,698 | 209 | IL, KY | Lee | Berea-Murrysville |
| 81 | Large Operating LLC | 3,686 | 3,385 | TX | Hutchinson | Granite Wash |
| 82 | Crowheart Energy | 3,638 | 3,349 | WY | Sweetwater | Mesaverde-Lance-Lewis |
| 83 | SM Energy Company | 3,629 | 2,575 | OK, TX, UT, WY | Webb | Austin Chalk |
| 84 | Expand Operating LLC | 3,603 | 3,350 | LA, OH, WV | De Soto | Travis Peak |
| 85 | Endeavor Energy Resources | 3,570 | 2,095 | KY, OK, TX, WY | Midland | Excello-Mulky |
| 86 | Ohio Oil Company | 3,547 | 47 | IL, KY, MI, MO, NE, TN | Crawford | Illinois Basin |
| 87 | Carter Oil Company | 3,524 | 57 | IL, KY, MI, MO, ND | Fayette | Illinois Basin |
| 88 | Atlas Operating | 3,510 | 3,184 | KS, NM, OK, TX | Dimmit | Eagle Ford |
| 89 | Huber J M | 3,446 | 1,769 | TX, WY | Sheridan | Niobrara |
| 90 | Talos Energy Offshore | 3,436 | 1,402 | LA, TX | South Marsh Island South | Gulf Coast Basin |
| 91 | Lewis Petro Properties | 3,423 | 2,935 | TX | Webb | Olmos |
| 92 | High River Resources Operating LLC | 3,394 | 3,319 | CO, NM, TX, UT, WY | Colfax | Mesaverde-Wasatch |
| 93 | Presidio Petroleum | 3,392 | 3,266 | ND, OK, TX | Hemphill | Granite Wash |
| 94 | Bcemach | 3,364 | 3,180 | KS, OK, WY | Woods | Mississippian |
| 95 | Murfin Drilling | 3,325 | 1,686 | CO, KS, ND | Russell | Central Kansas Uplift |
| 96 | Adamas Energy LLC | 3,312 | 3,117 | LA, TX, WY | Bossier | Travis Peak |
| 97 | Berexco | 3,266 | 2,379 | KS, NE, OK, TX | Hitchcock | Central Kansas Uplift |
| 98 | Txo Production | 3,245 | 298 | LA, ND, OK, TX | Jackson | Gulf Coast Basin (La - Tx) |
| 99 | Petro Tech | 3,233 | 19 | PA | Venango | Appalachian Basin - (Eastern Overthrust Area) |
| 100 | Javelin Energy | 3,230 | 3,135 | TX | Dimmit | Austin Chalk |
Ranked by well count from state well records across California, Pennsylvania, Texas, New Mexico, Oklahoma, Illinois, Louisiana, North Dakota, Colorado, Kansas, Mississippi, Ohio, Michigan, Alabama, Wyoming, Kentucky, Arkansas, Utah, New York, West Virginia, Montana, Nebraska, and Missouri, the largest operators are Chevron, Diversified Production LLC, and Aera Energy. The table below ranks the top 100 operators, each linking to its own profile with permits, top-producing wells, and contact details.
By well count — the number of wells of record attributed to an operator (including plugged and inactive wells), computed by Valor from public oil and gas data. Well count is a durable footprint measure; the table also shows producing-well counts and trailing-12-month oil and gas volumes so you can compare active output. Absorbed legacy names (e.g. Anadarko, Burlington) are excluded — their volumes are counted under the current operator.
In California, the operators with the most wells include Chevron, Aera Energy, California Resources Production. See the full California directory at /operator-services/companies/california/.
The operator named on your division order or royalty check stub is your operator — find it in the table or your state directory, open its profile, and confirm the wells and county. Valor manages minerals for owners: verifying the operator by tract, auditing every royalty check, and recovering suspended funds. Valor manages minerals; it never buys them.
The size of the operator doesn’t guarantee your check is right. Valor manages minerals for owners across California, Pennsylvania, Texas, New Mexico, Oklahoma, Illinois, Louisiana, North Dakota, Colorado, Kansas, Mississippi, Ohio, Michigan, Alabama, Wyoming, Kentucky, Arkansas, Utah, New York, West Virginia, Montana, Nebraska, and Missouri — confirming which operator covers each of your tracts, auditing every royalty check against production, and recovering suspended and unclaimed funds. Valor manages minerals; it never buys them.