Largest Oil & Gas Operators in California, Pennsylvania & 21 More States

Ranked by well count from state oil & gas regulator records, the largest operators across California, Pennsylvania, Texas, Wyoming, Oklahoma, Louisiana, North Dakota, Colorado, Kansas, Ohio, Michigan, Alabama, New Mexico, Mississippi, Kentucky, Arkansas, Utah, Illinois, West Virginia, New York, 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 2026-07-13. Each links to its full profile — permits, top-producing wells, and contact details.

Coverage: California, Pennsylvania, Texas, Wyoming, Oklahoma, Louisiana, North Dakota, Colorado, Kansas, Ohio, Michigan, Alabama, New Mexico, Mississippi, Kentucky, Arkansas, Utah, Illinois, West Virginia, New York, 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.

Operators Ranked
100
States Covered
23
Largest by Wells
Chevron

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Top 100 Operators by Well Count

RankOperator WellsProducing StateTop CountyTop Formation
1 Chevron 75,552 44,618 AK, AL, AR, CA, CO, KS, LA, MI, MS, MT, ND, NE, NM, OH, OK, PA, TX, UT, WV, WY Kern Kern River
2 Diversified Production LLC 60,760 59,190 AL, KY, LA, OH, OK, PA, TN, TX, VA, WV Indiana Marcellus
3 Aera Energy 57,803 39,120 CA Kern Monterey-Temblor
4 Hilcorp Energy Company 51,256 46,803 AK, AL, CO, LA, MS, NM, OH, PA, TX, WY San Juan Pictured Clliffs
5 EOG Resources 38,353 16,722 AL, AR, CA, CO, KS, LA, MI, MS, MT, ND, NM, NY, OH, OK, PA, TX, UT, VA, WV, WY Campbell Niobrara- Mowry
6 Oxy 37,193 28,616 AK, AL, AR, AZ, CA, CO, KS, KY, LA, MI, MS, MT, ND, NE, NM, NY, OK, TN, TX, UT, VA, WV, WY Yoakum San Andres
7 Scout Energy Management 21,558 19,776 CO, KS, MT, ND, NM, OK, TX, UT Crockett Anadarko Basin
8 Exxon Mobil 20,648 5,107 AK, AL, AR, AZ, CA, CO, IL, KS, KY, LA, MI, MS, MT, ND, NE, NM, OK, PA, TN, TX, UT, WV, WY Kleberg Gulf Coast Basin (La - Tx)
9 Pioneer Natural Resources 20,427 16,672 AK, CO, KS, LA, MS, MT, ND, NM, OK, TX, UT, WY Midland Thirty-One Carbonate-Chert
10 XTO Energy 18,285 11,191 AK, AR, CO, KS, KY, LA, MT, ND, NM, NY, OH, OK, PA, TX, UT, WV, WY Eddy Avalon-Bone Spring
11 Devon Energy Production Company 17,934 8,706 AK, AR, CO, IL, KS, KY, LA, MI, MS, MT, ND, NE, NM, OH, OK, PA, TX, UT, WV, WY Campbell Niobrara- Mowry
12 Apache 16,983 10,631 AK, AL, AR, AZ, CA, CO, IL, KS, KY, LA, MI, MS, MT, ND, NE, NM, NY, OK, PA, TX, UT, WY Reagan Thirty-One Carbonate-Chert
13 Chesapeake Energy 16,806 4,088 AL, AR, CO, KS, KY, LA, MT, ND, NM, NY, OH, OK, PA, TN, TX, UT, VA, WV, WY Bradford Anadarko Basin
14 Conocophillips Company 15,393 5,194 AK, AL, AR, CA, CO, IL, KS, KY, LA, MI, MO, MS, MT, ND, NE, NM, OK, TX, UT, WY Beechey Point Kuparuk River Kuparuk Riv Oil
15 Citation Oil & Gas 15,306 8,310 CO, IL, KS, LA, MS, MT, ND, NE, NM, OK, TX, UT, WY Carter Woodford
16 California Resources Production 15,258 8,925 CA Kern Monterey-Temblor
17 Shell Oil Company 15,206 2,082 AK, AL, AR, AZ, CA, CO, IL, KS, KY, LA, MI, MO, MS, MT, ND, NE, NM, NY, OH, OK, PA, TN, TX, UT, WV, WY Kern Antrim
18 Diamondback Energy 13,742 12,120 TX Martin Wolfcamp D
19 Bpx Operating Company 12,711 6,724 AK, CA, CO, IL, KS, LA, MI, NM, OH, OK, PA, TX, UT, WY Beechey Point Prudhoe Bay
20 Merit Energy Company 12,110 10,061 AR, CA, CO, KS, LA, MI, MT, NM, OK, TX, UT, WY Hidalgo Vicksburg
21 Basa Resources 11,685 11,334 OK, TX Gregg Travis Peak
22 Berry Petroleum Company 11,511 7,750 AR, CA, CO, IL, KS, KY, MS, OH, OK, PA, TN, TX, UT, WY Kern Monterey-Temblor
23 Bcemach III LLC 11,416 10,629 KS, NM, OK, TX Mitchell Granite Wash
24 Enervest Operating 11,228 8,353 AR, CO, LA, MI, NM, NY, OH, OK, PA, TX, UT, VA, WV, WY Dickenson Berea-Murrysville
25 Sentinel Peak Resources Ca 10,943 7,765 CA Kern Monterey-Temblor
26 Continental Resources 9,586 6,487 CO, IL, KS, KY, LA, MI, MS, MT, ND, NE, NM, OH, OK, TN, TX, WV, WY Converse Bakken
27 EQT Production Company 9,445 5,472 KY, OH, PA, TX, VA, WV Greene Marcellus
28 Crescent Energy Operating, LLC 9,250 8,901 TX, UT Andrews San Andres
29 TEP Rocky Mountain 9,042 7,317 CO Garfield Mesaverde
30 Burk Royalty 8,961 8,520 AR, KS, LA, NM, OK, TX, WY Hutchinson Granite Wash
31 PDC Energy 8,937 6,905 CO, KS, OH, TX Weld Muddy J Sand
32 COG Operating 8,352 6,124 NM, TX Upton Avalon-Bone Spring
33 California Resources Elk Hills LLC 7,576 6,776 CA Kern Monterey-Temblor
34 Southern Community 7,449 2,726 AL, AR, CA, CO, IL, KS, KY, LA, MI, MO, MS, MT, ND, NE, NM, NY, OH, OK, PA, TN, TX, UT, WV, WY Anderson Forest City Basin
35 Upp Operating LLC 7,411 7,335 TX Sutton Ozona Canyon
36 Ows Acquisition Co LLC 7,269 7,241 OH, PA, WV Stark Utica
37 Riverside Energy Michigan 6,995 6,500 MI Otsego Antrim
38 Formentera Operations LLC 6,968 6,614 LA, MS, ND, OK, TX Ector Thirty-One Carbonate-Chert
39 Ovintiv USA Inc 6,765 3,966 MT, ND, NM, OK, TX, UT, WY Martin Mesaverde-Wasatch
40 Urban Oil & Gas Group 6,689 6,286 AL, AR, IL, KS, LA, NE, OK, TX, UT, WY Tuscaloosa Pottsville Coal Interval
41 Mewbourne Oil Company 6,509 4,652 KS, NM, OK, TX Eddy Avalon-Bone Spring
42 Anschutz Exploration 6,495 487 AL, CA, CO, MT, ND, NE, NM, NY, OH, OK, PA, TX, UT, WY Campbell Niobrara- Mowry
43 Kinder Morgan Production 6,245 5,183 CO, KS, NE, NM, TX Scurry Thirty-One Carbonate-Chert
44 Qb Energy Operating LLC 6,118 5,200 CO Garfield Mesaverde
45 Coterra Energy Inc 5,997 3,856 NM, OH, OK, PA, TX Lea Avalon-Bone Spring
46 Denbury Onshore 5,900 4,414 AL, LA, MS, MT, ND, TX, WY Brazoria Judith River- Eagle
47 Rj Energy 5,516 3,568 KS, TX Anderson Forest City Basin
48 Samson Resources Company 5,463 1,093 AL, AR, CA, CO, KS, KY, LA, MI, MS, MT, ND, NE, NM, OH, OK, PA, TN, TX, UT, WY Converse Niobrara- Mowry
49 Texas Petroleum Investment Company 5,345 4,827 AL, AR, KS, LA, MS, TX Guadalupe Austin Chalk
50 Carbon Creek Energy 5,317 5,249 WY Johnson Niobrara
51 Pocahontas Gas 5,291 4,733 VA, WV Buchanan Marcellus
52 Minard Run Oil Company 4,777 2,255 IL, NY, PA Mc Kean Utica
53 Permian Resources Operating LLC 4,766 3,682 NM, TX Reeves Avalon-Bone Spring
54 Sun Explorationproduction Company 4,589 533 AL, AR, CA, CO, KY, LA, MI, MS, MT, ND, NE, NM, OH, TX, WY Starr Gulf Coast Basin (La - Tx)
55 Range Resources 4,452 2,179 NY, OH, OK, PA, VA, WV Washington Marcellus
56 BKV Barnett LLC 4,436 4,385 TX Wise Barnett
57 Kentucky West Virginia Gas Company 4,396 2,351 KY Floyd Berea-Murrysville
58 Colt Energy 4,338 2,110 KS, LA, MO, MS Allen Excello-Mulky
59 Blackbeard Operating 4,260 3,599 AR, NM, OK, TX Crane Thirty-One Carbonate-Chert
60 E & B Natural Resources Management 4,225 2,838 CA, KS, TX, WY Kern San Joaquin Basin
61 Whiting Petroleum Corp 4,188 2,591 AR, CA, CO, KS, LA, MI, MT, ND, NE, NM, OK, TX, WY Mountrail Bakken
62 Tidelands Oil Production Company 4,177 1,653 CA, TX Los Angeles Monterey
63 Simcoe LLC 4,099 3,778 CO, NM San Juan Pictured Clliffs
64 Lance Oil & Gas Company 4,083 2,332 CO, KS, MT, NM, TX, WY Campbell Niobrara- Mowry
65 Pa Gen Energy 4,004 916 PA Warren Appalachian Basin - (Eastern Overthrust Area)
66 Waggoner Operating,LLC 3,991 3,809 TX Wichita Palo Duro Basin
67 Flywheel Energy Production LLC 3,963 3,937 AR Van Buren Fayetteville
68 Own Resources Operating 3,950 3,888 CO, KS Yuma Niobrara East
69 SM Energy Company 3,920 2,867 CO, IL, LA, MT, ND, NE, NM, OK, PA, TX, UT, WY Webb Austin Chalk
70 Contango Resources Company 3,906 3,162 LA, MT, NM, OK, TX, WY Natrona Niobrara- Mowry
71 Two P Partners LLC 3,890 3,322 TX Ward Thirty-One Carbonate-Chert
72 Purewest Resources Inc 3,772 3,530 WY Sublette Mesaverde-Lance
73 Witco 3,770 65 NY, OH, PA, WV Mc Kean Appalachian Basin - (Eastern Overthrust Area)
74 Large Operating LLC 3,749 3,450 TX Hutchinson Granite Wash
75 Pennaco Energy Incorporated 3,715 2,520 MT, WY Campbell Niobrara
76 Ashland Oil & Refining 3,698 209 AR, CO, IL, KY, LA, MI, MS, ND, NY, TX, WY Johnson Berea-Murrysville
77 Highmark Energy Operating 3,687 3,411 LA, MS, OK, TX Montgomery Cotton Valley
78 Koda Gnb, LLC 3,658 3,314 UT Uintah Mesaverde-Wasatch
79 Endeavor Energy Resources 3,609 2,127 KS, KY, LA, MT, ND, NM, OK, PA, TX, WY Nowata Excello-Mulky
80 Crowheart Energy 3,585 3,348 CO, WY Sweetwater Mesaverde-Lance-Lewis
81 Eiger Operating Company, LLC 3,582 3,321 KS, OK Morton Anadarko Basin
82 Expand Operating LLC 3,559 3,339 LA, OH, TX, WV De Soto Travis Peak
83 Ohio Oil Company 3,546 47 AL, AR, CO, IL, KS, KY, MI, MO, MS, MT, ND, NE, TN, TX, UT Crawford Illinois Basin
84 Carter Oil Company 3,524 57 AR, CO, IL, KY, MI, MO, MS, MT, ND, TN, UT, WY Fayette Illinois Basin
85 Atlas Operating 3,506 3,192 KS, KY, NM, OK, TX Dimmit Eagle Ford
86 Extex Operating Company 3,467 3,299 AR, LA, NM, OK, TX Cochran San Andres
87 Huber J M 3,447 1,770 AL, AR, IL, KS, MI, MT, OK, TX, WY Sheridan Niobrara
88 Talos Energy Offshore 3,434 1,402 LA, TX Ship Shoal Gulf Coast Basin
89 Lewis Petro Properties 3,405 2,905 TX Webb Olmos
90 Bcemach 3,361 3,177 KS, OK, WY Woods Mississippian
91 Presidio Petroleum 3,356 3,229 CO, KS, LA, MI, MS, MT, ND, OH, OK, TX Hemphill Granite Wash
92 Murfin Drilling 3,320 1,680 CO, KS, MT, ND, OK Rawlins Central Kansas Uplift
93 Berexco 3,262 2,381 CO, KS, MT, NE, OK, TX Hitchcock Lansing
94 Adamas Energy LLC 3,255 3,105 LA, TX, WY Bossier Travis Peak
95 Txo Production 3,245 300 AL, AR, CA, CO, KY, LA, MS, MT, ND, NE, OK, TX, UT, WV, WY Jackson Gulf Coast Basin (La - Tx)
96 R2q Operating 3,241 3,011 OK, TX Wichita Barnett
97 Petro Tech 3,233 19 IL, LA, OK, PA, TX, WY Venango Appalachian Basin - (Eastern Overthrust Area)
98 Javelin Energy 3,208 3,105 AR, KY, OK, TX Dimmit Austin Chalk
99 Jonah Energy 3,138 2,693 CO, NM, TX, WY Sublette Mesaverde-Lance
100 Sandridge Exploration & Production 3,121 2,144 AR, CO, KS, LA, NM, OK, TX Alfalfa Mississippian

Largest Operators by State

Largest Operators in California

  1. Chevron (75,552)
  2. Aera Energy (57,803)
  3. California Resources Production (15,258)
  4. Berry Petroleum Company (11,511)
  5. Sentinel Peak Resources Ca (10,943)
  6. California Resources Elk Hills LLC (7,576)
  7. E & B Natural Resources Management (4,225)
  8. Tidelands Oil Production Company (4,177)
All California operators →

Largest Operators in Pennsylvania

  1. Diversified Production LLC (60,760)
  2. EQT Production Company (9,445)
  3. Minard Run Oil Company (4,777)
  4. Range Resources (4,452)
  5. Pa Gen Energy (4,004)
  6. Witco (3,770)
  7. Petro Tech (3,233)
  8. Seneca Resources (3,110)
All Pennsylvania operators →

Largest Operators in Texas

  1. Hilcorp Energy Company (51,256)
  2. Oxy (37,193)
  3. Scout Energy Management (21,558)
  4. Exxon Mobil (20,648)
  5. Pioneer Natural Resources (20,427)
  6. XTO Energy (18,285)
  7. Apache (16,983)
  8. Conocophillips Company (15,393)
All Texas operators →

Largest Operators in Wyoming

  1. EOG Resources (38,353)
  2. Devon Energy Production Company (17,934)
  3. Anschutz Exploration (6,495)
  4. Samson Resources Company (5,463)
  5. Carbon Creek Energy (5,317)
  6. Lance Oil & Gas Company (4,083)
  7. Contango Resources Company (3,906)
  8. Purewest Resources Inc (3,772)
All Wyoming operators →

Largest Operators in Oklahoma

  1. Chesapeake Energy (16,806)
  2. Citation Oil & Gas (15,306)
  3. Bcemach (3,361)
  4. Sandridge Exploration & Production (3,121)
  5. Stephens & Johnson Operating Company (2,842)
  6. Kaiserfrancis Oil Company (2,658)
  7. Unit Petroleum Company (2,398)
  8. Breitburn Operating (2,257)
All Oklahoma operators →

Largest Operators in Louisiana

  1. Shell Oil Company (15,206)
  2. Texas Petroleum Investment Company (5,345)
  3. Expand Operating LLC (3,559)
  4. Talos Energy Offshore (3,434)
  5. Adamas Energy LLC (3,255)
  6. Arena Offshore (2,966)
  7. Fieldwood Energy (2,608)
  8. Hunt Oil Company (2,382)
All Louisiana operators →

Largest Operators in North Dakota

  1. Continental Resources (9,586)
  2. Whiting Petroleum Corp (4,188)
  3. Oasis Petroleum North America (2,448)
  4. Devon Energy Williston,LLC (2,372)
  5. Petrohunt (1,757)
  6. Cobra Oil & Gas (1,455)
  7. Slawson Exploration Company (1,445)
  8. Enerplus Resources (1,436)
All North Dakota operators →

Largest Operators in Colorado

  1. TEP Rocky Mountain (9,042)
  2. PDC Energy (8,937)
  3. Qb Energy Operating LLC (6,118)
  4. Own Resources Operating (3,950)
  5. Encana Oil & Gas (2,991)
  6. Evergreen Natural Resources LLC (2,504)
  7. Crestone Peak Resources Operating (2,416)
  8. Laramie Energy (2,262)
All Colorado operators →

Largest Operators in Kansas

  1. Southern Community (7,449)
  2. Rj Energy (5,516)
  3. Colt Energy (4,338)
  4. Eiger Operating Company, LLC (3,582)
  5. Murfin Drilling (3,320)
  6. Berexco (3,262)
  7. American Warrior (3,064)
  8. Vess Oil (2,649)
All Kansas operators →

Largest Operators in Ohio

  1. Ows Acquisition Co LLC (7,269)
  2. Eco Power Crypto LLC (2,382)
  3. Belden And Blake Corp Dba Ward Lake Energy (1,763)
  4. Oxford Oil (1,728)
  5. Kenoil (1,631)
  6. Northwood Energy (1,629)
  7. EOG Ohio, LLC (1,247)
  8. Petrox (1,241)
All Ohio operators →

Largest Operators in Michigan

  1. Riverside Energy Michigan (6,995)
  2. Carter Oil Company (3,524)
  3. Mid Michigan Gas Storage Company (1,558)
  4. Consumers Energy Company (1,450)
  5. Consolidated Oil & Gas (1,397)
  6. V C P Michigan LLC (1,385)
  7. Muskegon Operating Company LLC (1,331)
  8. Terra Energy (1,188)
All Michigan operators →

Largest Operators in Alabama

  1. Urban Oil & Gas Group (6,689)
  2. Warrior Met Coal Gas (2,068)
  3. Pgp Operating (1,300)
  4. Black Warrior Methane (1,295)
  5. Pruet Production Company (986)
All Alabama operators →

Largest Operators in New Mexico

  1. Mewbourne Oil Company (6,509)
  2. Coterra Energy Inc (5,997)
  3. Simcoe LLC (4,099)
  4. Matador Production Company (2,657)
  5. Morning Star Oil Company (2,655)
  6. Cimarex Energy Company (2,508)
  7. Southwest Royalties (2,185)
  8. Enduring Resources (1,840)
All New Mexico operators →

Largest Operators in Mississippi

  1. Denbury Onshore (5,900)
  2. Callon Petroleum Company (1,192)
  3. Tellus Operating Group (825)
All Mississippi operators →

Largest Operators in Kentucky

  1. Kentucky West Virginia Gas Company (4,396)
  2. Ashland Oil & Refining (3,698)
  3. Equitable Production Company (2,114)
  4. Petroleum Exploration Company (1,637)
  5. Ohio Kentucky Oil (1,617)
  6. Ravenna Oil (1,452)
  7. Equitable Resources Exploration (1,426)
  8. Ashland Exploration (1,393)
All Kentucky operators →

Largest Operators in Arkansas

  1. Flywheel Energy Production LLC (3,963)
  2. Stephens Production Company (1,078)
  3. Razorback Production, LLC (908)
  4. Seeco (867)
  5. Van Buren Energy Production LLC (840)
  6. Mmgk Arkoma LLC (800)
  7. Hanna Oil And Gas Company (788)
  8. Secondary Oil (766)
All Arkansas operators →

Largest Operators in Utah

  1. Koda Gnb, LLC (3,658)
  2. Koda Uinta, LLC (2,253)
  3. Finley Resources (1,727)
  4. Greylock Production (1,699)
  5. QEP Energy Company (1,698)
  6. Uinta Wax Operating LLC (1,310)
  7. Fourpoint Resources, LLC (960)
  8. Elk Operating Company (832)
All Utah operators →

Largest Operators in Illinois

  1. Ohio Oil Company (3,546)
  2. Forest Oil (2,926)
  3. Gulf Refining Company (1,882)
  4. Hf Sinclair Corporation (1,546)
  5. Shakespeare Oil (1,101)
  6. Alco Oil & Gas (920)
  7. Petco Petroleum (906)
  8. R K Petroleum (868)
All Illinois operators →

Largest Operators in West Virginia

  1. Antero Resources (2,960)
  2. Greylock Conventional (2,663)
  3. Eastern Gas Transmission And Storage Inc (2,647)
  4. Pillar Energy (2,467)
  5. Wv Mineral Group LLC (2,419)
  6. Cabot Oil & Gas (2,315)
  7. Consolidation Coal Company (2,042)
  8. Columbia Natural Resources (1,997)
All West Virginia operators →

Largest Operators in New York

  1. Greenway Energy LLC (2,927)
  2. Ppp Future Development (2,544)
  3. United States Gypsum Company (1,160)
  4. National Fuel Gas Supply (1,090)
  5. U S Energy Development (1,018)
  6. Stedman Energy (746)
  7. Plants And Goodwin (694)
  8. Lee Oil Company (547)
All New York operators →

Largest Operators in Montana

  1. Ridge Oil & Gas (2,801)
  2. Fidelity Exploration & Production Company (2,711)
  3. Northwestern (1,755)
  4. New Horizon Resources (1,115)
  5. Somont Oil Company (1,022)
  6. Mmgl Mt I, LLC (970)
  7. Encore Operating (669)
  8. Cardinal Petroleum (625)
All Montana operators →

Largest Operators in Nebraska

  1. Currently Unassigned (2,263)
  2. Pan American Petroleum (1,301)
  3. Central Operating (717)
All Nebraska operators →

Largest Operators in Missouri

  1. Skelly Oil Company (1,368)
  2. Carmel Energy (1,307)
  3. Continental Exploration (667)

Frequently Asked Questions

Who are the largest oil and gas operators?

Ranked by well count from state well records across California, Pennsylvania, Texas, Wyoming, Oklahoma, Louisiana, North Dakota, Colorado, Kansas, Ohio, Michigan, Alabama, New Mexico, Mississippi, Kentucky, Arkansas, Utah, Illinois, West Virginia, New York, 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.

How is “largest” measured here?

By well count — the number of wells an operator currently operates, from state oil & gas regulator records. 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.

Who are the largest operators in California?

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/.

How can I tell which of these operators is on my minerals?

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.

Own minerals under one of these operators?

The size of the operator doesn’t guarantee your check is right. Valor manages minerals for owners across California, Pennsylvania, Texas, Wyoming, Oklahoma, Louisiana, North Dakota, Colorado, Kansas, Ohio, Michigan, Alabama, New Mexico, Mississippi, Kentucky, Arkansas, Utah, Illinois, West Virginia, New York, 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.

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