| Rank |
Company |
Revenue
($ millions) |
Assets |
| # 1 |
Schlumberger N.V. |
35,475 |
68,005 |
| # 2 |
Halliburton Company |
23,633 |
36,942 |
| # 3 |
Devon Energy Corporation |
13,145 |
29,532 |
| # 4 |
Chesapeake Energy Corporation |
12,764 |
17,357 |
| # 5 |
Occidental Petroleum Corporation |
12,480 |
43,437 |
| # 6 |
EOG Resources, Inc. |
8,757 |
26,975 |
| # 7 |
Anadarko Petroleum Corporation |
8,698 |
46,414 |
| # 8 |
Transocean Ltd (Switzerland) |
7,386 |
26,329 |
| # 9 |
Apache Corporation |
6,366 |
18,842 |
| # 10 |
Marathon Oil Corporation |
5,861 |
32,311 |
| # 11 |
Pioneer Natural Resources Company |
4,825 |
15,154 |
| # 12 |
Valaris Limited |
4,063 |
13,637 |
| # 13 |
Antero Resources Corporation |
3,955 |
14,155 |
| # 14 |
Nabors Industries Ltd. |
3,864 |
9,538 |
| # 15 |
Noble Corporation plc |
3,352 |
12,892 |
| # 16 |
Southwestern Energy Company |
3,133 |
8,110 |
| # 17 |
Noble Energy Inc. |
3,133 |
24,196 |
| # 18 |
CNX Resources Corporation |
3,114 |
10,930 |
| # 19 |
Oceaneering International, Inc. |
3,063 |
3,430 |
| # 20 |
Murphy Oil Corporation |
3,033 |
11,494 |
| # 21 |
Roan Resources, Inc. |
2,883 |
9,977 |
| # 22 |
Superior Energy Services, Inc. |
2,775 |
4,914 |
| # 23 |
Continental Resources, Inc. |
2,680 |
14,920 |
| # 24 |
Helmerich & Payne, Inc. |
2,597 |
7,130 |
| # 25 |
Diamond Offshore Drilling, Inc. |
2,419 |
7,165 |
| # 26 |
California Resources Corporation |
2,403 |
7,053 |
| # 27 |
EQT Corporation |
2,340 |
13,976 |
| # 28 |
Rowan Companies plc |
2,137 |
8,347 |
| # 29 |
Par Pacific Holdings, Inc. |
2,066 |
892 |
| # 30 |
Whiting Petroleum Corporation |
2,051 |
11,389 |
| # 31 |
QEP Resources, Inc. |
2,019 |
8,426 |
| # 32 |
EP ENERGY LLC |
1,908 |
5,828 |
| # 33 |
EP Energy Corporation |
1,908 |
5,833 |
| # 34 |
Patterson-UTI Energy, Inc. |
1,891 |
4,533 |
| # 35 |
WPX Energy, Inc. |
1,888 |
8,350 |
| # 36 |
Concho Resources Inc. |
1,804 |
12,642 |
| # 37 |
C&J Energy Services, Inc |
1,749 |
2,233 |
| # 38 |
ENERGY XXI LTD |
1,729 |
1,764 |
| # 39 |
Range Resources Corporation |
1,598 |
6,900 |
| # 40 |
SM Energy Company |
1,557 |
5,622 |
| # 41 |
PARAGON OFFSHORE PLC |
1,492 |
2,384 |
| # 42 |
Semgroup Corporation |
1,455 |
2,871 |
| # 43 |
Cimarex Energy Co |
1,453 |
5,243 |
| # 44 |
Coterra Energy Inc. |
1,357 |
5,262 |
| # 45 |
Atwood Oceanics Inc |
1,352 |
4,748 |
| # 46 |
RPC, Inc. |
1,264 |
1,237 |
| # 47 |
Denbury Inc. |
1,258 |
5,920 |
| # 48 |
SEVENTY SEVEN ENERGY INC. |
1,131 |
1,903 |
| # 49 |
Tetra Technologies, Inc. |
1,130 |
1,656 |
| # 50 |
Breitburn Energy Partners LP |
1,109 |
4,872 |
| # 51 |
Expro Group Holdings N.V. |
975 |
1,727 |
| # 52 |
WILLBROS GROUP, INC.NEW |
909 |
446 |
| # 53 |
Energen Corp |
905 |
4,614 |
| # 54 |
Unit Corporation |
854 |
2,809 |
| # 55 |
Ultra Petroleum Corp. |
839 |
971 |
| # 56 |
Basic Energy Services, Inc. |
806 |
1,161 |
| # 57 |
Core Laboratories N.V. |
798 |
625 |
| # 58 |
Key Energy Services, Inc. |
792 |
1,328 |
| # 59 |
Oasis Petroleum Inc. |
790 |
5,649 |
| # 60 |
Vantage Drilling International |
772 |
3,332 |
| # 61 |
SandRidge Energy, Inc. |
769 |
2,991 |
| # 62 |
Atlas Energy Group, LLC |
753 |
1,918 |
| # 63 |
Titan Energy, LLC |
740 |
1,731 |
| # 64 |
MEMORIAL RESOURCE DEVELOPMENT CORP. |
732 |
5,083 |
| # 65 |
Parker Drilling Company |
712 |
1,377 |
| # 66 |
Gulfport Energy Corporation |
709 |
3,335 |
| # 67 |
Helix Energy Solutions Group, Inc. |
696 |
2,412 |
| # 68 |
Laredo Petroleum, Inc. |
607 |
1,813 |
| # 69 |
PDC Energy, Inc. |
595 |
2,371 |
| # 70 |
TRANSOCEAN PARTNERS LLC |
580 |
2,231 |
| # 71 |
GRIZZLY ENERGY, LLC |
567 |
2,709 |
| # 72 |
Battalion Oil Corporation |
550 |
3,459 |
| # 73 |
Stone Energy Corp |
545 |
1,410 |
| # 74 |
Pioneer Energy Services Corp. |
541 |
830 |
| # 75 |
W&T Offshore, Inc. |
507 |
1,208 |
| # 76 |
Rice Energy Inc |
502 |
3,971 |
| # 77 |
Sanchez Energy Corp |
476 |
1,542 |
| # 78 |
Kosmos Energy Ltd. |
472 |
3,203 |
| # 79 |
CSI Compressco LP |
458 |
980 |
| # 80 |
Diamondback Energy, Inc. |
447 |
2,758 |
| # 81 |
ALTA MESA HOLDINGS, LP |
434 |
723 |
| # 82 |
Carrizo Oil & Gas, Inc. |
429 |
2,027 |
| # 83 |
Black Stone Minerals, L.P. |
393 |
1,061 |
| # 84 |
Amplify Energy Corp. |
365 |
679 |
| # 85 |
Amplify Energy Corp. |
358 |
2,906 |
| # 86 |
Triangle Petroleum Corp |
358 |
753 |
| # 87 |
Nuverra Environmental Solutions, Inc. |
357 |
531 |
| # 88 |
LEGACY RESERVES LP |
339 |
1,626 |
| # 89 |
SABINE OIL & GAS CORP |
337 |
798 |
| # 90 |
Exco Resources Inc |
328 |
954 |
| # 91 |
Chaparral Energy, Inc. |
324 |
1,205 |
| # 92 |
Matador Resources Company |
316 |
1,141 |
| # 93 |
Ranger Oil Corporation |
305 |
518 |
| # 94 |
Civitas Resources, Inc. |
293 |
1,273 |
| # 95 |
RSP Permian Inc |
284 |
2,980 |
| # 96 |
Gran Tierra Energy Inc. |
276 |
1,146 |
| # 97 |
Northern Oil and Gas, Inc. |
275 |
734 |
| # 98 |
Parsley Energy, Inc. |
266 |
2,514 |
| # 99 |
Montage Resources Corporation |
255 |
1,266 |
| # 100 |
Comstock Resources, Inc. |
252 |
1,196 |