| Rank |
Company |
Revenue
($ millions) |
Assets |
| # 1 |
Schlumberger N.V. |
42,149 |
61,547 |
| # 2 |
Murphy Oil Corporation |
28,626 |
17,523 |
| # 3 |
Halliburton Company |
28,503 |
27,410 |
| # 4 |
Occidental Petroleum Corporation |
24,172 |
64,210 |
| # 5 |
Apache Corporation |
17,209 |
60,737 |
| # 6 |
Marathon Oil Corporation |
16,221 |
35,306 |
| # 7 |
WEATHERFORD INTERNATIONAL LTD./SWITZERLAND |
15,215 |
22,795 |
| # 8 |
Anadarko Petroleum Corporation |
13,411 |
52,589 |
| # 9 |
Chesapeake Energy Corporation |
12,316 |
41,611 |
| # 10 |
EOG Resources, Inc. |
11,683 |
27,337 |
| # 11 |
Devon Energy Corporation |
9,502 |
43,326 |
| # 12 |
Transocean Ltd (Switzerland) |
9,196 |
34,255 |
| # 13 |
Nabors Industries Ltd. |
6,990 |
12,656 |
| # 14 |
CNX Resources Corporation |
5,430 |
12,671 |
| # 15 |
Superior Energy Services, Inc. |
4,568 |
7,803 |
| # 16 |
Valaris Limited |
4,301 |
18,565 |
| # 17 |
Noble Energy Inc. |
4,223 |
17,554 |
| # 18 |
Noble Corporation plc |
3,547 |
14,608 |
| # 19 |
Pioneer Natural Resources Company |
3,228 |
13,069 |
| # 20 |
WPX Energy, Inc. |
3,189 |
9,456 |
| # 21 |
Diamond Offshore Drilling, Inc. |
2,987 |
7,235 |
| # 22 |
Oceaneering International, Inc. |
2,783 |
2,768 |
| # 23 |
SandRidge Energy, Inc. |
2,731 |
9,791 |
| # 24 |
Patterson-UTI Energy, Inc. |
2,723 |
4,557 |
| # 25 |
Southwestern Energy Company |
2,715 |
6,738 |
| # 26 |
Continental Resources, Inc. |
2,573 |
9,140 |
| # 27 |
Newfield Exploration Co |
2,567 |
7,912 |
| # 28 |
PLAINS EXPLORATION & PRODUCTION CO |
2,565 |
17,298 |
| # 29 |
ENERGY XXI LTD |
2,418 |
3,612 |
| # 30 |
Denbury Inc. |
2,410 |
11,139 |
| # 31 |
QEP Resources, Inc. |
2,356 |
9,109 |
| # 32 |
Whiting Petroleum Corporation |
2,173 |
7,272 |
| # 33 |
WILLBROS GROUP, INC.NEW |
2,005 |
978 |
| # 34 |
Key Energy Services, Inc. |
1,960 |
2,762 |
| # 35 |
RPC, Inc. |
1,945 |
1,367 |
| # 36 |
Concho Resources Inc. |
1,837 |
8,589 |
| # 37 |
Roan Resources, Inc. |
1,774 |
11,451 |
| # 38 |
EQT Corporation |
1,642 |
8,850 |
| # 39 |
Cimarex Energy Co |
1,624 |
6,305 |
| # 40 |
Energen Corp |
1,618 |
6,176 |
| # 41 |
SM Energy Company |
1,505 |
4,200 |
| # 42 |
Range Resources Corporation |
1,458 |
6,729 |
| # 43 |
Markwest Energy Partners LP |
1,452 |
6,836 |
| # 44 |
Rowan Companies plc |
1,393 |
7,699 |
| # 45 |
Basic Energy Services, Inc. |
1,375 |
1,596 |
| # 46 |
Unit Corporation |
1,315 |
3,761 |
| # 47 |
Semgroup Corporation |
1,237 |
1,748 |
| # 48 |
Coterra Energy Inc. |
1,205 |
4,616 |
| # 49 |
Eagle Rock Energy Partners LP |
984 |
2,294 |
| # 50 |
Core Laboratories N.V. |
981 |
637 |
| # 51 |
BERRY PETROLEUM COMPANY, LLC |
979 |
3,325 |
| # 52 |
Stone Energy Corp |
951 |
2,776 |
| # 53 |
C&J Energy Services Inc |
940 |
1,013 |
| # 54 |
Pioneer Energy Services Corp. |
919 |
1,340 |
| # 55 |
Tetra Technologies, Inc. |
881 |
1,262 |
| # 56 |
W&T Offshore, Inc. |
874 |
2,349 |
| # 57 |
Helix Energy Solutions Group, Inc. |
846 |
3,387 |
| # 58 |
Ultra Petroleum Corp. |
810 |
2,007 |
| # 59 |
ANTERO RESOURCES LLC |
736 |
3,619 |
| # 60 |
Hercules Offshore Inc |
710 |
2,017 |
| # 61 |
Quicksilver Resources Inc |
709 |
1,382 |
| # 62 |
Oasis Petroleum Inc. |
703 |
2,529 |
| # 63 |
Bill Barrett Corp |
700 |
2,869 |
| # 64 |
Parker Drilling Company |
678 |
1,256 |
| # 65 |
Kosmos Energy Ltd. |
672 |
2,366 |
| # 66 |
ROSETTA RESOURCES INC. |
613 |
1,415 |
| # 67 |
SABINE OIL & GAS CORP |
606 |
2,202 |
| # 68 |
GEOKINETICS INC |
596 |
393 |
| # 69 |
Laredo Petroleum, Inc. |
588 |
2,338 |
| # 70 |
Gran Tierra Energy Inc. |
585 |
1,733 |
| # 71 |
SilverBow Resorces, Inc. |
557 |
2,444 |
| # 72 |
Chaparral Energy, Inc. |
556 |
2,008 |
| # 73 |
Exco Resources Inc |
547 |
2,324 |
| # 74 |
Ion Geophysical Corporation |
526 |
821 |
| # 75 |
Forbes Energy Services LTD |
473 |
513 |
| # 76 |
Vantage Drilling Co |
471 |
3,530 |
| # 77 |
Cal Dive International Inc |
468 |
631 |
| # 78 |
Comstock Resources, Inc. |
456 |
2,567 |
| # 79 |
Epl Oil & Gas Inc |
424 |
1,706 |
| # 80 |
CLAYTON WILLIAMS ENERGY INC /DE |
423 |
1,575 |
| # 81 |
Breitburn Energy Partners LP |
423 |
2,915 |
| # 82 |
Kodiak Oil & Gas Corp |
409 |
2,374 |
| # 83 |
MCMORAN EXPLORATION CO /DE/ |
377 |
2,677 |
| # 84 |
QR Energy LP |
372 |
1,687 |
| # 85 |
Carrizo Oil & Gas, Inc. |
368 |
1,884 |
| # 86 |
Venoco Inc |
357 |
846 |
| # 87 |
PDC Energy, Inc. |
356 |
1,827 |
| # 88 |
Blue Dolphin Energy Co |
352 |
56 |
| # 89 |
Nuverra Environmental Solutions, Inc. |
352 |
1,644 |
| # 90 |
GRIZZLY ENERGY, LLC |
347 |
2,200 |
| # 91 |
LEGACY RESERVES LP |
346 |
1,690 |
| # 92 |
Global Geophysical Services Inc |
339 |
553 |
| # 93 |
ALTA MESA HOLDINGS, LP |
319 |
782 |
| # 94 |
Ranger Oil Corporation |
317 |
1,843 |
| # 95 |
Northern Oil and Gas, Inc. |
312 |
1,191 |
| # 96 |
BLACK ELK ENERGY OFFSHORE OPERATIONS, LLC |
304 |
590 |
| # 97 |
Harvest Oil & Gas Corporation |
285 |
2,065 |
| # 98 |
Magnum Hunter Resources Corp |
271 |
2,199 |
| # 99 |
Titan Energy, LLC |
268 |
1,499 |
| # 100 |
Resolute Energy Corp |
258 |
1,364 |