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PetroStrategies, Inc.
PO Box 260415
Plano, Texas 75026-0415
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Biggest US Oil and Gas Companies


Rank by
2009 Assets1



Company

Worldwide
Liquids
Production,
Million Barrels

Worldwide
Natural Gas
Production,
Billion Cubic Feet

1 Exxon Mobil Corporation 725.0 2,383.0
2 ConocoPhillips 674.0 1,821.0
3 Chevron Corporation 341.0 1,906.0
4 Anadarko Petroleum Corporation 88.0 817.0
5 Marathon Oil Corporation 90.0 351.0
6 Occidental Petroleum Corporation 179.0 338.0
7 XTO Energy Inc. 31.7 855.0
8 Chesapeake Energy Corporation 11.8 835.0
9 Devon Energy Corporation 72.0 966.0
10 Hess Corporation 107.0 270.0
11 Apache Corporation 105.9 642.0
12 El Paso Corporation 5.648 219.0
13 EOG Resources, Inc. 28.75 616.8
14 Murphy Oil Corporation 48.20 68.40
15 Noble Energy Inc. 29.00 285.0
16 Williams Companies, Inc.2 NA 435.0
17 Questar Corporation 3.50 168.7
18 Pioneer Natural Resources Company 19.03 157.4
19 Plains Exploration & Production Company 17.56 78.18
20 Petrohawk Energy Corp. 1.52 174.0
21 Newfield Exploration Company 14.00 257.0
22 Range Resources Corporation 4.744 130.6
23 Southwestern Energy Co. 0.124 299.7
24 Denbury Resources, Inc. 13.50 24.76
25 Whiting Petroleum Corp. 15.38 29.33
26 Energen Resources Corporation 6.481 72.34
27 Helix Energy Solutions Group Inc. 2.741 27.33
28 Forest Oil Corporation 7.265 139.3
29 Cabot Oil & Gas Corporation 0.844 97.91
30 Encore Acquisition Co. 10.02 33.92
31 Quicksilver Resources Inc. 5.403 86.04
32 Cimarex Energy Company 8.498 118.0
33 Concho Resources Inc. 7.336 21.57
34 EQT Production 0.099 104.3
35 Penn Virginia Corporation 1.277 43.34
36 Mariner Energy Inc. 5.950 90.80
37 ATP Oil & Gas Corp. 3.353 15.12
38 SandRidge Energy Inc. 2.894 87.46
39 SM Energy Inc.3 6.328 71.11
40 Exco Resources Inc. 1.571 118.7
41 Continental Resources Inc. 10.02 21.61
42 Berry Petroleum Co. 7.186 22.66
43 Unit Corporation 2.774 44.06
44 Kinder Morgan CO2 Co. LP 15.68 0.298
45 CNX Gas Corp. NA 94.42
46 Atlas Energy Inc.2,4 0.199 35.76
47 Ultra Petroleum Corp. 1.320 172.2
48 Bill Barrett Corp. 0.710 85.49
49 Comstock Resources Inc. 0.775 60.82
50 Eagle Rock Energy Partners 0.984 4.914

Notes:

1 Ranked in order of 2009 worldwide oil equivalent reserves as reported in "OGJ 200/100", Oil & Gas Journal, September 15, 2010. .
2 Oil and gas operations only.

3 Formerly St. Mary Land & Exploration Company

4 Bought by Chevron as announced November 9, 2010



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