| Rank |
Company |
Revenue
($ millions) |
Assets |
| # 1 |
Schlumberger N.V. |
32,917 |
56,312 |
| # 2 |
Halliburton Company |
22,408 |
25,377 |
| # 3 |
Occidental Petroleum Corporation |
20,393 |
109,330 |
| # 4 |
EOG Resources, Inc. |
17,380 |
37,125 |
| # 5 |
Pioneer Natural Resources Company |
9,304 |
19,067 |
| # 6 |
Chesapeake Energy Corporation |
8,595 |
16,193 |
| # 7 |
OVINTIV INC. |
6,726 |
21,487 |
| # 8 |
Apache Corporation |
6,411 |
18,107 |
| # 9 |
Devon Energy Corporation |
6,220 |
13,717 |
| # 10 |
Par Pacific Holdings, Inc. |
5,402 |
2,701 |
| # 11 |
Marathon Oil Corporation |
5,190 |
20,245 |
| # 12 |
Continental Resources, Inc. |
4,632 |
15,728 |
| # 13 |
Concho Resources Inc. |
4,592 |
24,732 |
| # 14 |
Noble Energy Inc. |
4,438 |
20,647 |
| # 15 |
EQT Corporation |
4,416 |
18,809 |
| # 16 |
Antero Resources Corporation |
4,409 |
15,198 |
| # 17 |
Diamondback Energy, Inc. |
3,964 |
23,531 |
| # 18 |
Transocean Ltd. |
3,088 |
24,105 |
| # 19 |
Nabors Industries Ltd. |
3,043 |
6,761 |
| # 20 |
Southwestern Energy Company |
3,038 |
6,717 |
| # 21 |
Murphy Oil Corporation |
2,829 |
11,719 |
| # 22 |
Range Resources Corporation |
2,828 |
6,612 |
| # 23 |
Helmerich & Payne, Inc. |
2,673 |
5,842 |
| # 24 |
California Resources Corporation |
2,634 |
6,958 |
| # 25 |
Patterson-UTI Energy, Inc. |
2,471 |
4,440 |
| # 26 |
Cimarex Energy Co |
2,363 |
7,140 |
| # 27 |
WPX Energy, Inc. |
2,292 |
8,413 |
| # 28 |
Oasis Petroleum Inc. |
2,072 |
7,499 |
| # 29 |
Cabot Oil & Gas Corporation |
2,066 |
4,487 |
| # 30 |
Ensco Rowan plc |
2,053 |
16,931 |
| # 31 |
Oceaneering International, Inc. |
2,048 |
2,741 |
| # 32 |
Liberty Oilfield Services Inc. |
1,990 |
1,283 |
| # 33 |
Parsley Energy, Inc. |
1,959 |
9,856 |
| # 34 |
CNX Resources Corporation |
1,922 |
9,061 |
| # 35 |
Keane Group, Inc. |
1,822 |
1,665 |
| # 36 |
SM Energy Company |
1,590 |
6,292 |
| # 37 |
Whiting Petroleum Corporation |
1,572 |
7,637 |
| # 38 |
Kosmos Energy Ltd. |
1,499 |
4,317 |
| # 39 |
Superior Energy Services, Inc. |
1,425 |
1,993 |
| # 40 |
Gulfport Energy Corporation |
1,346 |
3,883 |
| # 41 |
Noble Corporation |
1,305 |
8,284 |
| # 42 |
Select Energy Services, Inc. |
1,292 |
1,348 |
| # 43 |
Denbury Resources Inc. |
1,275 |
4,692 |
| # 44 |
RPC, Inc. |
1,222 |
1,053 |
| # 45 |
QEP Resources, Inc. |
1,206 |
5,478 |
| # 46 |
PDC Energy, Inc. |
1,156 |
4,449 |
| # 47 |
Tetra Technologies, Inc. |
1,038 |
1,272 |
| # 48 |
Matador Resources Company |
984 |
4,070 |
| # 49 |
Diamond Offshore Drilling, Inc. |
981 |
5,834 |
| # 50 |
Centennial Resource Development, Inc. |
944 |
4,688 |
| # 51 |
Magnolia Oil & Gas Corporation |
936 |
3,466 |
| # 52 |
Talos Energy, Inc. |
928 |
2,589 |
| # 53 |
Extraction Oil & Gas, Inc. |
907 |
2,927 |
| # 54 |
HESS MIDSTREAM LP |
848 |
3,278 |
| # 55 |
Laredo Petroleum, Inc. |
837 |
2,264 |
| # 56 |
Nine Energy Service, Inc. |
833 |
851 |
| # 57 |
EP ENERGY LLC |
820 |
3,710 |
| # 58 |
EP Energy Corporation |
820 |
3,710 |
| # 59 |
FTS International, Inc. |
777 |
639 |
| # 60 |
Comstock Resources, Inc. |
769 |
4,657 |
| # 61 |
Vantage Drilling International |
761 |
1,091 |
| # 62 |
Helix Energy Solutions Group, Inc. |
752 |
2,597 |
| # 63 |
Basic Energy Services, Inc. |
710 |
550 |
| # 64 |
Unit Corporation |
675 |
2,090 |
| # 65 |
Callon Petroleum Company |
672 |
7,195 |
| # 66 |
Core Laboratories N.V. |
668 |
775 |
| # 67 |
Montage Resources Corporation |
634 |
1,951 |
| # 68 |
Mammoth Energy Services, Inc. |
625 |
952 |
| # 69 |
Frank's International N.V. |
580 |
994 |
| # 70 |
Pioneer Energy Services Corp. |
576 |
674 |
| # 71 |
Gran Tierra Energy Inc. |
571 |
2,045 |
| # 72 |
Berry Petroleum Corporation |
559 |
1,690 |
| # 73 |
KLX Energy Services Holdings, Inc. |
544 |
623 |
| # 74 |
W&T Offshore, Inc. |
535 |
1,004 |
| # 75 |
U.S. Well Services, Inc. |
515 |
613 |
| # 76 |
Alta Mesa Resources, Inc. |
490 |
499 |
| # 77 |
Black Stone Minerals, L.P. |
488 |
1,545 |
| # 78 |
Quintana Energy Services Inc. |
484 |
241 |
| # 79 |
Riviera Resources Inc |
480 |
816 |
| # 80 |
CSI Compressco LP |
477 |
822 |
| # 81 |
Northern Oil & Gas Inc |
472 |
1,905 |
| # 82 |
Penn Virginia Corporation |
471 |
1,218 |
| # 83 |
HighPoint Resources Corporation |
453 |
2,156 |
| # 84 |
Key Energy Services, Inc. |
414 |
348 |
| # 85 |
Oasis Midstream Partners LP |
410 |
1,155 |
| # 86 |
Ranger Energy Services, Inc. |
337 |
294 |
| # 87 |
Bonanza Creek Energy, Inc. |
313 |
1,206 |
| # 88 |
Blue Dolphin Energy Co |
309 |
71 |
| # 89 |
Viper Energy Partners LP |
298 |
2,786 |
| # 90 |
SilverBow Resorces, Inc. |
289 |
960 |
| # 91 |
MIDSTATES PETROLEUM COMPANY, INC. |
276 |
878 |
| # 92 |
SandRidge Energy, Inc. |
267 |
608 |
| # 93 |
Chaparral Energy, Inc. |
236 |
988 |
| # 94 |
PACIFIC DRILLING S.A. |
230 |
2,257 |
| # 95 |
NCS Multistage Holdings, Inc. |
205 |
203 |
| # 96 |
Independence Contract Drilling, Inc. |
204 |
517 |
| # 97 |
Ring Energy, Inc. |
196 |
973 |
| # 98 |
Earthstone Energy, Inc. |
191 |
1,126 |
| # 99 |
Forbes Energy Services LTD |
188 |
190 |
| # 100 |
Ion Geophysical Corporation |
175 |
233 |