| Rank |
Company |
Revenue
($ millions) |
Assets |
| # 1 |
Schlumberger N.V. |
30,440 |
71,987 |
| # 2 |
Halliburton Company |
20,620 |
25,085 |
| # 3 |
Devon Energy Corporation |
13,949 |
30,241 |
| # 4 |
Occidental Petroleum Corporation |
12,508 |
42,026 |
| # 5 |
Anadarko Petroleum Corporation |
11,908 |
42,086 |
| # 6 |
EOG Resources Inc. |
11,208 |
29,833 |
| # 7 |
EXPAND ENERGY Corp |
9,496 |
12,425 |
| # 8 |
Pioneer Natural Resources Company |
5,455 |
17,003 |
| # 9 |
Marathon Oil Corporation |
4,765 |
22,012 |
| # 10 |
Encana Corporation |
4,443 |
15,267 |
| # 11 |
Noble Energy Inc. |
4,256 |
21,476 |
| # 12 |
ANTERO RESOURCES Corp |
3,656 |
15,261 |
| # 13 |
EQT Corp |
3,378 |
29,523 |
| # 14 |
Southwestern Energy Company |
3,203 |
7,521 |
| # 15 |
Continental Resources, Inc. |
3,121 |
14,200 |
| # 16 |
Transocean Ltd. |
2,973 |
22,410 |
| # 17 |
Range Resources Corporation |
2,611 |
11,729 |
| # 18 |
Concho Resources Inc. |
2,586 |
13,732 |
| # 19 |
Nabors Industries Ltd. |
2,564 |
8,402 |
| # 20 |
Par Pacific Holdings Inc. |
2,443 |
1,347 |
| # 21 |
Patterson-UTI Energy Inc. |
2,357 |
5,759 |
| # 22 |
Murphy Oil Corporation |
2,225 |
9,861 |
| # 23 |
Semgroup Corporation |
2,082 |
5,377 |
| # 24 |
California Resources Corp |
2,006 |
6,207 |
| # 25 |
Helmerich & Payne, Inc. |
2,000 |
6,362 |
| # 26 |
Oceaneering International Inc. |
1,922 |
3,024 |
| # 27 |
Cimarex Energy Co |
1,918 |
5,043 |
| # 28 |
Superior Energy Services, Inc. |
1,874 |
3,110 |
| # 29 |
Valaris Ltd |
1,843 |
14,626 |
| # 30 |
Newfield Exploration Co |
1,767 |
4,961 |
| # 31 |
Coterra Energy Inc. |
1,764 |
4,727 |
| # 32 |
C&J Energy Services, Inc |
1,639 |
1,609 |
| # 33 |
QEP Resources, Inc. |
1,623 |
7,395 |
| # 34 |
RPC Inc. |
1,595 |
1,147 |
| # 35 |
NexTier Oilfield Solutions Inc. |
1,542 |
1,043 |
| # 36 |
Diamond Offshore Drilling Inc. |
1,486 |
6,251 |
| # 37 |
Whiting Holdings LLC |
1,481 |
8,403 |
| # 38 |
CNX Resources Corp |
1,455 |
6,932 |
| # 39 |
WPX Energy, Inc. |
1,336 |
8,207 |
| # 40 |
Gulfport Energy Corporation |
1,320 |
5,808 |
| # 41 |
Rowan Companies plc |
1,283 |
8,458 |
| # 42 |
Chord Energy Corp |
1,248 |
6,615 |
| # 43 |
Noble Corporation plc |
1,237 |
10,795 |
| # 44 |
Diamondback Energy, Inc. |
1,205 |
7,771 |
| # 45 |
Denbury Inc. |
1,130 |
4,471 |
| # 46 |
SM Energy Co |
1,129 |
6,177 |
| # 47 |
EP ENERGY LLC |
1,066 |
4,891 |
| # 48 |
EP Energy Corporation |
1,066 |
4,900 |
| # 49 |
ProPetro Holding Corp. |
982 |
719 |
| # 50 |
Parsley Energy, Inc. |
967 |
8,793 |
| # 51 |
Energen Corp |
961 |
5,034 |
| # 52 |
PDC Energy, Inc. |
922 |
4,420 |
| # 53 |
Ultra Petroleum Corp. |
892 |
1,513 |
| # 54 |
Basic Energy Services, Inc. |
864 |
820 |
| # 55 |
WILLBROS GROUP, INC.NEW |
850 |
364 |
| # 56 |
Vital Energy, Inc. |
822 |
2,023 |
| # 57 |
Tetra Technologies Inc. |
820 |
1,309 |
| # 58 |
RSP Permian Inc |
804 |
6,270 |
| # 59 |
Carrizo Oil & Gas, Inc. |
746 |
2,778 |
| # 60 |
Sanchez Energy Corp |
740 |
2,471 |
| # 61 |
Unit Corporation |
740 |
2,581 |
| # 62 |
Select Water Solutions, Inc. |
692 |
1,356 |
| # 63 |
Mammoth Energy Services Inc. |
691 |
867 |
| # 64 |
Core Laboratories N.V. |
660 |
585 |
| # 65 |
Kosmos Energy Ltd. |
637 |
3,193 |
| # 66 |
Extraction Oil & Gas, Inc. |
604 |
3,385 |
| # 67 |
Helix Energy Solutions Group Inc. |
581 |
2,363 |
| # 68 |
Hess Midstream Partners LP |
566 |
2,635 |
| # 69 |
Matador Resources Co |
544 |
2,146 |
| # 70 |
ENERGY XXI GULF COAST, INC. |
512 |
1,077 |
| # 71 |
W&T Offshore Inc. |
487 |
908 |
| # 72 |
Expro Group Holdings N.V. |
455 |
1,262 |
| # 73 |
Pioneer Energy Services Corp. |
446 |
767 |
| # 74 |
Parker Drilling Company |
443 |
990 |
| # 75 |
LEGACY RESERVES LP |
436 |
1,493 |
| # 76 |
Key Energy Services, Inc. |
436 |
529 |
| # 77 |
Permian Resources Corp |
430 |
3,617 |
| # 78 |
Black Stone Minerals, L.P. |
430 |
1,576 |
| # 79 |
BRAZOS VALLEY LONGHORN, L.L.C. |
427 |
2,778 |
| # 80 |
Gran Tierra Energy Inc. |
423 |
1,430 |
| # 81 |
Montage Resources Corporation |
384 |
1,224 |
| # 82 |
Battalion Oil Corporation |
378 |
1,644 |
| # 83 |
Callon Petroleum Company |
366 |
2,693 |
| # 84 |
SRC Energy Inc. |
363 |
2,080 |
| # 85 |
ALTA MESA HOLDINGS, LP |
305 |
1,085 |
| # 86 |
Resolute Energy Corp |
303 |
642 |
| # 87 |
CSI Compressco LP |
296 |
743 |
| # 88 |
Exco Resources Inc |
284 |
840 |
| # 89 |
Jagged Peak Energy Inc. |
267 |
1,103 |
| # 90 |
Blue Dolphin Energy Co |
258 |
73 |
| # 91 |
Comstock Resources Inc. |
255 |
930 |
| # 92 |
Bill Barrett Corp |
253 |
1,391 |
| # 93 |
Amplify Energy Corp. |
229 |
688 |
| # 94 |
Harvest Oil & Gas Corporation |
226 |
1,442 |
| # 95 |
Vantage Drilling International |
213 |
1,083 |
| # 96 |
Northern Oil and Gas Inc. |
209 |
632 |
| # 97 |
Rex Energy Corp |
205 |
942 |
| # 98 |
NCS Multistage Holdings, Inc. |
202 |
464 |
| # 99 |
Ion Geophysical Corporation |
198 |
301 |
| # 100 |
Jones Energy Inc |
189 |
1,710 |