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Oil and Gas Service Companies*

 

Rank by
Market Capitalization



Company


Industry
Segment

Market Capitalization,
$ Million

1 Schlumberger Ltd. International Integrated 39,775
2 Halliburton Company International Integrated 17,244
3 Baker Hughes Inc. International Integrated 9,367
4 Transocean Sedco Forex Offshore Drillers 9,330
5 Weatherford International Oilfield Equipment 6,065
6 Nabors Industries  Onshore Drilling 5,271
7 Diamond Offshore Drilling Company  Offshore Drillers 4,963
8 Noble Drilling Corporation Offshore Drillers 4,823
9 ENSCO International Offshore Drillers 4,119
10 BJ Services Company Oilfield Equipment 4,534
11 Global Marine, Inc. Offshore Drillers 3,730
12 Smith International Oilfield Equipment 3,625
13 R&B Falcon Corp. Offshore Drillers 3,582
14 Santa Fe International Offshore Drillers 3,443
15 Cooper Cameron Corporation Oilfield Equipment 3,419
16 Rowan Companies Offshore Drillers 2,466
17 National Oilwell Oilfield Equipment 1,810
18 Helmerich & Payne Onshore Drilling 1,643
19 Tidewater Inc. Transportation 1,579
20 Colflexip Stena Offshore Diving/Construction 1,521
21 Hanover Company Oilfield Equipment 1,481
22 Petroleum Geo-Services Seismic Services 1,354
23 Marine Drilling Company Offshore Drillers 1,300
24 Pride International Offshore Drillers 1,293
25 Lone Star Technologies Oilfield Equipment 1,156
26 Global Industries Diving/Construction 1,080
27 Atwood Oceanics, Inc. Offshore Drillers 828
28 Key Energy Services Onshore Drilling 791
29 Patterson Energy Inc. . Onshore Drilling 787
30 Cal Dive International Diving/Construction 715
31 Varco International Oilfield Equipment 711
32 Seacor SMIT <1> Transportation 665
33 Tuboscope Inc. Oilfield Equipment 650
34 UTI Energy <1> Onshore Drilling 572
35 Grey Wolf <1> Onshore Drilling 558
36 Veritas DSG Seismic Services 554
37 Carbo Ceramics Oilfield Equipment 471
38 Maverick Tube Corp. Oilfield Equipment 469
39 McDermott International Diving/Construction 460
40 Oceaneering International Diving/Construction 375
41 Unit Corporation <2> Onshore Drilling 356
42 Input/Output Inc. Seismic Services 311
43 Parker Drilling Company Onshore Drilling 310
44 Stolt Comex Seaway Diving/Construction 285
45 Offshore Logistics <1> Transportation 269
46 Friede & Goldman Oilfield Equipment 269
47 Trico Marine <1> Transportation 198
48 TETRA Technologies Oilfield Equipment 169
49 Seitel Inc. Seismic Services 158
50 Gulfmark Offshore <1> Transportation 151
51 Gulf Island Fabrication Diving/Construction

148