| Rank |
Company |
Revenue
($ millions) |
Assets |
| # 1 |
Schlumberger N.V. |
45,266 |
67,100 |
| # 2 |
Halliburton Company |
29,402 |
29,223 |
| # 3 |
Occidental Petroleum Corporation |
24,455 |
69,443 |
| # 4 |
Chesapeake Energy Corporation |
17,506 |
41,782 |
| # 5 |
Apache Corporation |
16,105 |
61,637 |
| # 6 |
WEATHERFORD INTERNATIONAL LTD./SWITZERLAND |
15,263 |
21,977 |
| # 7 |
Marathon Oil Corporation |
14,959 |
35,620 |
| # 8 |
Anadarko Petroleum Corporation |
14,581 |
55,781 |
| # 9 |
EOG Resources, Inc. |
14,487 |
30,574 |
| # 10 |
Devon Energy Corporation |
10,397 |
42,877 |
| # 11 |
Transocean Ltd (Switzerland) |
9,484 |
32,546 |
| # 12 |
Nabors Industries Ltd. |
6,152 |
12,160 |
| # 13 |
Murphy Oil Corporation |
5,390 |
17,509 |
| # 14 |
Noble Energy Inc. |
5,015 |
19,642 |
| # 15 |
Valaris Limited |
4,920 |
19,473 |
| # 16 |
Superior Energy Services, Inc. |
4,612 |
7,411 |
| # 17 |
Noble Corporation plc |
4,234 |
16,218 |
| # 18 |
Pioneer Natural Resources Company |
3,720 |
12,293 |
| # 19 |
Continental Resources, Inc. |
3,455 |
11,941 |
| # 20 |
Helmerich & Payne, Inc. |
3,427 |
6,411 |
| # 21 |
Southwestern Energy Company |
3,371 |
8,048 |
| # 22 |
CNX Resources Corporation |
3,300 |
11,394 |
| # 23 |
Oceaneering International, Inc. |
3,287 |
3,129 |
| # 24 |
QEP Resources, Inc. |
2,941 |
9,377 |
| # 25 |
Diamond Offshore Drilling, Inc. |
2,920 |
8,391 |
| # 26 |
Whiting Petroleum Corporation |
2,828 |
8,833 |
| # 27 |
WPX Energy, Inc. |
2,761 |
8,429 |
| # 28 |
Patterson-UTI Energy, Inc. |
2,716 |
4,687 |
| # 29 |
Regency Energy Partners LP |
2,521 |
8,782 |
| # 30 |
ENERGY XXI LTD |
2,479 |
4,162 |
| # 31 |
Denbury Inc. |
2,466 |
11,789 |
| # 32 |
Concho Resources Inc. |
2,338 |
9,591 |
| # 33 |
Roan Resources, Inc. |
2,332 |
16,505 |
| # 34 |
SM Energy Company |
2,293 |
4,705 |
| # 35 |
SEVENTY SEVEN ENERGY INC. |
2,188 |
2,027 |
| # 36 |
WILLBROS GROUP, INC.NEW |
2,019 |
871 |
| # 37 |
Cimarex Energy Co |
1,998 |
7,253 |
| # 38 |
SandRidge Energy, Inc. |
1,983 |
7,685 |
| # 39 |
Range Resources Corporation |
1,863 |
7,299 |
| # 40 |
EQT Corporation |
1,862 |
9,792 |
| # 41 |
RPC, Inc. |
1,861 |
1,384 |
| # 42 |
Energen Corp |
1,785 |
6,622 |
| # 43 |
Coterra Energy Inc. |
1,746 |
4,981 |
| # 44 |
Markwest Energy Partners LP |
1,662 |
9,396 |
| # 45 |
EP ENERGY LLC |
1,640 |
8,326 |
| # 46 |
Key Energy Services, Inc. |
1,592 |
2,587 |
| # 47 |
Rowan Companies plc |
1,579 |
7,976 |
| # 48 |
Semgroup Corporation |
1,427 |
2,471 |
| # 49 |
Unit Corporation |
1,352 |
4,022 |
| # 50 |
Antero Resources Corporation |
1,313 |
6,614 |
| # 51 |
Basic Energy Services, Inc. |
1,263 |
1,543 |
| # 52 |
Exco Resources Inc |
1,260 |
2,409 |
| # 53 |
Oasis Petroleum Inc. |
1,200 |
4,712 |
| # 54 |
Eagle Rock Energy Partners LP |
1,195 |
2,128 |
| # 55 |
Atwood Oceanics Inc |
1,103 |
4,079 |
| # 56 |
Expro Group Holdings N.V. |
1,078 |
1,561 |
| # 57 |
Core Laboratories N.V. |
1,074 |
661 |
| # 58 |
Battalion Oil Corporation |
1,000 |
5,356 |
| # 59 |
W&T Offshore, Inc. |
984 |
2,507 |
| # 60 |
Stone Energy Corp |
974 |
3,249 |
| # 61 |
Pioneer Energy Services Corp. |
960 |
1,230 |
| # 62 |
Ultra Petroleum Corp. |
933 |
2,785 |
| # 63 |
Tetra Technologies, Inc. |
909 |
1,207 |
| # 64 |
Kodiak Oil & Gas Corp |
905 |
3,924 |
| # 65 |
Par Pacific Holdings, Inc. |
886 |
827 |
| # 66 |
Helix Energy Solutions Group, Inc. |
877 |
2,544 |
| # 67 |
Parker Drilling Company |
874 |
1,535 |
| # 68 |
Hercules Offshore Inc |
858 |
2,301 |
| # 69 |
Kosmos Energy Ltd. |
852 |
2,346 |
| # 70 |
ROSETTA RESOURCES INC. |
814 |
3,277 |
| # 71 |
C&J Energy Services Inc |
783 |
1,132 |
| # 72 |
Vantage Drilling Co |
732 |
3,628 |
| # 73 |
Gran Tierra Energy Inc. |
724 |
1,905 |
| # 74 |
Epl Oil & Gas Inc |
693 |
1,858 |
| # 75 |
Laredo Petroleum, Inc. |
665 |
2,624 |
| # 76 |
Breitburn Energy Partners LP |
635 |
4,196 |
| # 77 |
Chaparral Energy, Inc. |
629 |
2,398 |
| # 78 |
SilverBow Resorces, Inc. |
588 |
2,644 |
| # 79 |
Bill Barrett Corp |
568 |
2,382 |
| # 80 |
Quicksilver Resources Inc |
562 |
1,370 |
| # 81 |
Ion Geophysical Corporation |
549 |
865 |
| # 82 |
Nuverra Environmental Solutions, Inc. |
526 |
1,411 |
| # 83 |
Carrizo Oil & Gas, Inc. |
520 |
2,111 |
| # 84 |
LEGACY RESERVES LP |
485 |
1,660 |
| # 85 |
Amplify Energy Corp. |
470 |
2,342 |
| # 86 |
Titan Energy, LLC |
468 |
2,344 |
| # 87 |
QR Energy LP |
456 |
1,816 |
| # 88 |
GRIZZLY ENERGY, LLC |
455 |
2,490 |
| # 89 |
SABINE OIL & GAS CORP |
442 |
1,118 |
| # 90 |
Ranger Oil Corporation |
431 |
2,507 |
| # 91 |
CLAYTON WILLIAMS ENERGY INC /DE |
429 |
1,367 |
| # 92 |
Civitas Resources, Inc. |
422 |
1,546 |
| # 93 |
Comstock Resources, Inc. |
420 |
2,139 |
| # 94 |
Forbes Energy Services LTD |
420 |
501 |
| # 95 |
PDC Energy, Inc. |
411 |
2,025 |
| # 96 |
Blue Dolphin Energy Co |
410 |
58 |
| # 97 |
Cal Dive International Inc |
361 |
651 |
| # 98 |
ALTA MESA HOLDINGS, LP |
359 |
793 |
| # 99 |
Resolute Energy Corp |
350 |
1,469 |
| # 100 |
Amplify Energy Corp. |
344 |
1,552 |