| Rank |
Company |
Revenue
($ millions) |
Assets |
| # 1 |
Schlumberger N.V. |
27,810 |
77,956 |
| # 2 |
Halliburton Company |
15,887 |
27,000 |
| # 3 |
Devon Energy Corporation |
12,197 |
25,913 |
| # 4 |
Occidental Petroleum Corporation |
10,090 |
43,109 |
| # 5 |
Chesapeake Energy Corporation |
7,872 |
13,028 |
| # 6 |
Anadarko Petroleum Corporation |
7,869 |
45,564 |
| # 7 |
EOG Resources Inc. |
7,651 |
29,459 |
| # 8 |
Marathon Oil Corporation |
4,650 |
31,094 |
| # 9 |
Transocean Ltd. |
4,161 |
26,889 |
| # 10 |
Pioneer Natural Resources Company |
3,824 |
16,459 |
| # 11 |
Noble Energy Inc. |
3,491 |
21,011 |
| # 12 |
Encana Corporation |
2,918 |
14,653 |
| # 13 |
Valaris Limited |
2,776 |
14,375 |
| # 14 |
Southwestern Energy Company |
2,436 |
7,076 |
| # 15 |
Noble Corporation plc |
2,302 |
11,440 |
| # 16 |
Noble Corporation |
2,302 |
11,440 |
| # 17 |
Oceaneering International Inc. |
2,272 |
3,130 |
| # 18 |
Nabors Industries Ltd. |
2,228 |
8,187 |
| # 19 |
CNX Resources Corporation |
2,026 |
9,184 |
| # 20 |
Continental Resources, Inc. |
1,980 |
13,812 |
| # 21 |
Murphy Oil Corporation |
1,874 |
10,296 |
| # 22 |
Par Pacific Holdings Inc. |
1,865 |
1,145 |
| # 23 |
Rowan Companies plc |
1,843 |
8,676 |
| # 24 |
Antero Resources Corporation |
1,745 |
14,256 |
| # 25 |
Concho Resources Inc. |
1,635 |
12,119 |
| # 26 |
EQT Corporation |
1,608 |
15,473 |
| # 27 |
Diamond Offshore Drilling Inc. |
1,600 |
6,372 |
| # 28 |
California Resources Corporation |
1,547 |
6,354 |
| # 29 |
Helmerich & Payne Inc. |
1,505 |
6,678 |
| # 30 |
Superior Energy Services, Inc. |
1,450 |
3,470 |
| # 31 |
QEP Resources, Inc. |
1,377 |
7,245 |
| # 32 |
Semgroup Corporation |
1,332 |
3,075 |
| # 33 |
Whiting Holdings LLC |
1,285 |
9,876 |
| # 34 |
Cimarex Energy Co |
1,257 |
4,682 |
| # 35 |
SM Energy Company |
1,217 |
6,394 |
| # 36 |
Coterra Energy Inc. |
1,156 |
5,123 |
| # 37 |
Range Resources Corporation |
1,100 |
11,282 |
| # 38 |
Denbury Inc. |
976 |
4,275 |
| # 39 |
C&J Energy Services, Inc |
971 |
1,362 |
| # 40 |
Roan Resources, Inc. |
918 |
4,661 |
| # 41 |
Patterson-UTI Energy Inc. |
916 |
3,805 |
| # 42 |
Atwood Oceanics Inc |
870 |
4,630 |
| # 43 |
Rice Energy Inc |
779 |
7,818 |
| # 44 |
RICE ENERGY OPERATING LLC |
779 |
7,777 |
| # 45 |
EP ENERGY LLC |
767 |
4,757 |
| # 46 |
EP Energy Corporation |
767 |
4,761 |
| # 47 |
WILLBROS GROUP, INC.NEW |
732 |
363 |
| # 48 |
RPC Inc. |
729 |
1,035 |
| # 49 |
Ultra Petroleum Corp. |
721 |
1,541 |
| # 50 |
Chord Energy Corporation |
705 |
6,179 |
| # 51 |
Tetra Technologies Inc. |
695 |
1,316 |
| # 52 |
WPX Energy, Inc. |
693 |
7,264 |
| # 53 |
PARAGON OFFSHORE PLC |
636 |
1,904 |
| # 54 |
Unit Corporation |
602 |
2,479 |
| # 55 |
Vital Energy Inc. |
597 |
1,782 |
| # 56 |
Core Laboratories N.V. |
595 |
573 |
| # 57 |
Energen Corp |
533 |
4,580 |
| # 58 |
Diamondback Energy Inc. |
527 |
5,350 |
| # 59 |
Helix Energy Solutions Group Inc. |
488 |
2,247 |
| # 60 |
Expro Group Holdings N.V. |
488 |
1,588 |
| # 61 |
Breitburn Energy Partners LP |
469 |
4,115 |
| # 62 |
Parsley Energy, Inc. |
458 |
3,939 |
| # 63 |
Carrizo Oil & Gas, Inc. |
444 |
1,626 |
| # 64 |
Sanchez Energy Corp |
431 |
1,286 |
| # 65 |
Parker Drilling Company |
427 |
1,104 |
| # 66 |
W&T Offshore Inc. |
400 |
830 |
| # 67 |
Gulfport Energy Corporation |
386 |
4,223 |
| # 68 |
Kosmos Energy Ltd. |
385 |
3,341 |
| # 69 |
PDC Energy, Inc. |
383 |
4,486 |
| # 70 |
Stone Energy Corp |
377 |
1,139 |
| # 71 |
RSP Permian Inc |
354 |
4,996 |
| # 72 |
GRIZZLY ENERGY, LLC |
345 |
1,309 |
| # 73 |
LEGACY RESERVES LP |
314 |
1,300 |
| # 74 |
CSI Compressco LP |
311 |
786 |
| # 75 |
CLAYTON WILLIAMS ENERGY INC /DE |
289 |
1,495 |
| # 76 |
Gran Tierra Energy Inc. |
288 |
1,368 |
| # 77 |
Amplify Energy Corp. |
285 |
1,973 |
| # 78 |
Extraction Oil & Gas, Inc. |
278 |
2,785 |
| # 79 |
Pioneer Energy Services Corp. |
277 |
700 |
| # 80 |
Exco Resources Inc |
271 |
661 |
| # 81 |
Matador Resources Company |
264 |
1,465 |
| # 82 |
Black Stone Minerals L.P. |
261 |
1,129 |
| # 83 |
Chaparral Energy, Inc. |
252 |
846 |
| # 84 |
Montage Resources Corporation |
235 |
1,198 |
| # 85 |
Mammoth Energy Services Inc. |
231 |
421 |
| # 86 |
SAExploration Holdings, Inc. |
206 |
202 |
| # 87 |
Callon Petroleum Company |
201 |
2,268 |
| # 88 |
Civitas Resources Inc. |
195 |
1,134 |
| # 89 |
Harvest Oil & Gas Corporation |
185 |
1,607 |
| # 90 |
Bill Barrett Corp |
179 |
1,385 |
| # 91 |
Comstock Resources Inc. |
176 |
890 |
| # 92 |
ALTA MESA HOLDINGS, LP |
174 |
814 |
| # 93 |
Ion Geophysical Corporation |
173 |
313 |
| # 94 |
Blue Dolphin Energy Co |
168 |
75 |
| # 95 |
Resolute Energy Corp |
164 |
588 |
| # 96 |
Triangle Petroleum Corp |
159 |
56 |
| # 97 |
Vantage Drilling International |
159 |
1,160 |
| # 98 |
Nuverra Environmental Solutions, Inc. |
152 |
343 |
| # 99 |
Northern Oil and Gas Inc. |
145 |
432 |
| # 100 |
Rex Energy Corp |
139 |
894 |