The top 100 oil and gas lease holders on federal lands by acres leased, as of March 2004, according to the Bureau of Land Management:
 
No. Lease Holder Acres
1. Yates family companies, individuals 2,738,222
2. Encana Oil and Gas 1,004,845
3. Tom Brown Inc. 856,887
4. Burlington Resources 647,279
5. Devon Energy 645,969
6. Conoco Phillips 637,275
7. Exxon-Mobil 624,987
8. EOG Resources 591,879
9. Anadarko 585,814
10. Questar 558,378
11. Westport Oil and Gas 496,561
12. BP Amoco 446,615
13. Cabot Oil and Gas 435,780
14. ChevronTexaco 423,048
15. Marathon Oil 358,611
16. NPC Inc. 349,559
17. Kerr-McGee 284,533
18. Williams Production Co. 277,547
19. Clayton Williams 276,535
20. Energy West 269,869
21. Kirkwood Oil and Gas 255,348
22. Brown, Maurice W. 244,878
23. Strang, John P. 241,421
24. Lockridge, John P. 225,390
25. Lance Oil and Gas 222,603
26. Prima Energy Co. 212,830
27. Liberty Petroleum Corp. 206,743
28. Fortuna 204,246
29. Bill Barrett Corp. 200,586
30. Quaneco LLC 195,479
31. Samson Resources Co. 193,754
32. Fidelity Exploration and Production Co 191,259
33. Wolverine Gas and Oil 189,195
34. White Energy Corp. 180,026
35. Occidental Petroleum 179,802
36. Dominion Exploration and Production 177,565
37. Noble Energy Inc. 168,231
38. Anderson Oil 164,212
39. Omimex Canada LTD 162,909
40. Pennaco Energy 156,878
41. Brown, Bonnie J. 144,380
42. Wold Oil Properties 143,878
43. Hanson & Strahn Inc. 140,093
44. Newark Valley Oil and Gas 138,577
45. True Oil Co. 137,249
46. Nance Petroleum Corp 136,242
47. Howell Petroleum Corp 130,923
48. El Paso Production 128,635
49. Intrepid O&G LLC 124,957
50. Merit Energy Partners 124,531
51. Retamco Operating 121,944
52. Bruce, James 120,602
53. Andex Resources 115,999
54. Klabzuba Oil and Gas 115,796
55. Carbon Energy Corp (USA) 115,554
56. Anschutz Corp 115,157
57. XTO Energy 113,581
58. Western Gas Resources 112,028
59. Dugan Production Corp. 109,265
60. J.M. Huber 106,673
61. Donegan, Ben 105,707
62. Chesapeake Exploration 105,025
63. Savant Resources LLC 100,701
64. Warren Resources Inc. 96,195
65. Oconnell, R. K. 95,798
66. Continental Resources 94,762
67. Hunt Oil Co. 93,974
68. Stephens Energy 92,151
69. Shadco 91,899
70. Gunnison Energy Corp. 91,804
71. T Bar S Oil Co 91,216
72. Energen Resources 91,037
73. Robert L. Bayless Producer 91,005
74. Ross Exploration Inc. 90,689
75. PYR Energy Corp 90,097
76. Great Northern Gas 90,053
77. Citation Oil and Gas Corp 89,925
78. Dolar Energy LLC 89,868
79. Senich, Mike 89,270
80. Shama Zoe LTD Partnership 88,830
81. Winn Exploration Co 88,730
82. Antelope Energy Co 88,517
83. Stone Energy Corp 87,387
84. Medallion Exploration 86,930
85. CDX Gas 86,215
86. Double Eagle Petroleum Co. 84,559
87. Moncrief Partners and Trusts 83,772
88. Condor Exploration LLC 83,522
89. Lario Oil and Gas 82,982
90. Decker Energy Investments 82,699
91. Amerada Hess Corp. 82,643
92. Swift Energy Co. 82,224
93. Kennedy Oil 80,407
94. Avalon Explorations II LLC 80,142
95. Titan Resources Corp. 79,970
96. Maralex Resources 79,607
97. Palo Production Corp. 77,654
98. Energy Investments 77,268
99. Infinity Oil and Gas 76,423
100. Ultra resources Inc. 75,376