| Rank |
Company |
Revenue
($ millions) |
Assets |
| # 1 |
Schlumberger N.V. |
32,815 |
70,507 |
| # 2 |
Halliburton Company |
23,995 |
25,982 |
| # 3 |
EOG Resources, Inc. |
17,275 |
33,934 |
| # 4 |
Occidental Petroleum Corporation |
15,560 |
43,854 |
| # 5 |
Anadarko Petroleum Corporation |
13,382 |
40,376 |
| # 6 |
Devon Energy Corporation |
10,734 |
19,566 |
| # 7 |
Chesapeake Energy Corporation |
10,231 |
10,947 |
| # 8 |
Pioneer Natural Resources Company |
9,415 |
17,903 |
| # 9 |
Apache Corporation |
7,424 |
21,582 |
| # 10 |
Marathon Oil Corporation |
6,582 |
21,321 |
| # 11 |
Encana Corporation |
5,939 |
15,344 |
| # 12 |
Noble Energy Inc. |
4,986 |
21,010 |
| # 13 |
Continental Resources, Inc. |
4,710 |
15,298 |
| # 14 |
EQT Corporation |
4,558 |
20,721 |
| # 15 |
Concho Resources Inc. |
4,151 |
26,294 |
| # 16 |
Antero Resources Corporation |
4,140 |
15,519 |
| # 17 |
Southwestern Energy Company |
3,862 |
5,797 |
| # 18 |
Par Pacific Holdings, Inc. |
3,411 |
1,461 |
| # 19 |
Patterson-UTI Energy, Inc. |
3,327 |
5,470 |
| # 20 |
Range Resources Corporation |
3,283 |
9,708 |
| # 21 |
California Resources Corporation |
3,064 |
7,158 |
| # 22 |
Nabors Industries Ltd. |
3,058 |
7,854 |
| # 23 |
Transocean Ltd. |
3,018 |
25,665 |
| # 24 |
Helmerich & Payne, Inc. |
2,664 |
6,144 |
| # 25 |
Murphy Oil Corporation |
2,571 |
11,053 |
| # 26 |
Semgroup Corporation |
2,503 |
5,210 |
| # 27 |
Cimarex Energy Co |
2,339 |
6,062 |
| # 28 |
Oasis Petroleum Inc. |
2,322 |
7,626 |
| # 29 |
WPX Energy, Inc. |
2,310 |
8,203 |
| # 30 |
C&J Energy Services, Inc |
2,222 |
1,424 |
| # 31 |
Cabot Oil & Gas Corporation |
2,188 |
4,199 |
| # 32 |
Diamondback Energy, Inc. |
2,176 |
21,596 |
| # 33 |
Liberty Oilfield Services Inc. |
2,155 |
1,117 |
| # 34 |
Keane Group, Inc. |
2,137 |
1,055 |
| # 35 |
Superior Energy Services, Inc. |
2,130 |
2,216 |
| # 36 |
Whiting Petroleum Corporation |
2,081 |
7,760 |
| # 37 |
SM Energy Company |
2,067 |
6,353 |
| # 38 |
QEP Resources, Inc. |
1,933 |
6,118 |
| # 39 |
Oceaneering International, Inc. |
1,909 |
2,825 |
| # 40 |
Parsley Energy, Inc. |
1,826 |
9,391 |
| # 41 |
CNX Resources Corporation |
1,730 |
8,592 |
| # 42 |
RPC, Inc. |
1,721 |
1,200 |
| # 43 |
Ensco Rowan plc |
1,705 |
14,024 |
| # 44 |
ProPetro Holding Corp. |
1,705 |
1,275 |
| # 45 |
Mammoth Energy Services, Inc. |
1,690 |
1,073 |
| # 46 |
PDC Energy, Inc. |
1,549 |
4,544 |
| # 47 |
FTS International, Inc. |
1,543 |
744 |
| # 48 |
Select Energy Services, Inc. |
1,529 |
1,361 |
| # 49 |
Denbury Resources Inc. |
1,474 |
4,723 |
| # 50 |
Gulfport Energy Corporation |
1,355 |
6,051 |
| # 51 |
EP ENERGY LLC |
1,324 |
4,181 |
| # 52 |
EP Energy Corporation |
1,324 |
4,181 |
| # 53 |
Laredo Petroleum, Inc. |
1,106 |
2,420 |
| # 54 |
Diamond Offshore Drilling, Inc. |
1,083 |
6,036 |
| # 55 |
Noble Corporation |
1,083 |
9,265 |
| # 56 |
Carrizo Oil & Gas, Inc. |
1,066 |
3,185 |
| # 57 |
Extraction Oil & Gas, Inc. |
1,061 |
4,166 |
| # 58 |
Sanchez Energy Corp |
1,057 |
2,820 |
| # 59 |
Tetra Technologies, Inc. |
999 |
1,386 |
| # 60 |
Basic Energy Services, Inc. |
965 |
762 |
| # 61 |
BRAZOS VALLEY LONGHORN, L.L.C. |
947 |
3,255 |
| # 62 |
Matador Resources Company |
900 |
3,456 |
| # 63 |
Ultra Petroleum Corp. |
892 |
1,733 |
| # 64 |
Talos Energy, Inc. |
891 |
2,480 |
| # 65 |
Centennial Resource Development, Inc. |
891 |
4,260 |
| # 66 |
Kosmos Energy Ltd. |
887 |
4,088 |
| # 67 |
Unit Corporation |
843 |
2,698 |
| # 68 |
Nine Energy Service, Inc. |
827 |
1,141 |
| # 69 |
Rowan Companies plc |
825 |
8,118 |
| # 70 |
Helix Energy Solutions Group, Inc. |
740 |
2,348 |
| # 71 |
Core Laboratories N.V. |
701 |
649 |
| # 72 |
Northern Oil & Gas Inc |
679 |
1,504 |
| # 73 |
Riviera Resources Inc |
666 |
1,593 |
| # 74 |
Hess Midstream Partners LP |
662 |
2,820 |
| # 75 |
U.S. Well Services, Inc. |
649 |
480 |
| # 76 |
SRC Energy Inc. |
646 |
2,755 |
| # 77 |
Black Stone Minerals, L.P. |
610 |
1,750 |
| # 78 |
Quintana Energy Services Inc. |
604 |
325 |
| # 79 |
Pioneer Energy Services Corp. |
590 |
742 |
| # 80 |
Callon Petroleum Company |
588 |
3,979 |
| # 81 |
Berry Petroleum Corporation |
587 |
1,692 |
| # 82 |
Jagged Peak Energy Inc. |
582 |
1,767 |
| # 83 |
W&T Offshore, Inc. |
581 |
849 |
| # 84 |
Legacy Reserves Inc. |
555 |
1,475 |
| # 85 |
Frank's International N.V. |
522 |
1,194 |
| # 86 |
Key Energy Services, Inc. |
522 |
443 |
| # 87 |
Roan Resources, Inc. |
518 |
2,749 |
| # 88 |
Montage Resources Corporation |
515 |
1,434 |
| # 89 |
KLX Energy Services Holdings, Inc. |
495 |
673 |
| # 90 |
Parker Drilling Company |
481 |
828 |
| # 91 |
Vanguard Natural Resources, Inc. |
460 |
1,520 |
| # 92 |
HighPoint Resources Corporation |
453 |
2,252 |
| # 93 |
CSI Compressco LP |
439 |
827 |
| # 94 |
ALTA MESA HOLDINGS, LP |
409 |
936 |
| # 95 |
Exco Resources Inc |
394 |
1,033 |
| # 96 |
Blue Dolphin Energy Co |
341 |
71 |
| # 97 |
Amplify Energy Corp. |
340 |
837 |
| # 98 |
Cypress Energy Partners, L.P. |
315 |
153 |
| # 99 |
Ranger Energy Services, Inc. |
303 |
303 |
| # 100 |
Rosehill Resources Inc. |
302 |
817 |