| Rank |
Company |
Revenue
($ millions) |
Assets |
| # 1 |
Schlumberger N.V. |
23,601 |
42,434 |
| # 2 |
Occidental Petroleum Corporation |
17,809 |
80,064 |
| # 3 |
Halliburton Company |
14,445 |
20,680 |
| # 4 |
EOG Resources, Inc. |
11,032 |
35,805 |
| # 5 |
Pioneer Natural Resources Company |
6,685 |
19,229 |
| # 6 |
OVINTIV INC. |
6,087 |
14,469 |
| # 7 |
Chesapeake Energy Corporation |
5,296 |
6,584 |
| # 8 |
Devon Energy Corporation |
4,828 |
9,912 |
| # 9 |
Apache Corporation |
4,308 |
12,746 |
| # 10 |
Antero Resources Corporation |
3,492 |
13,151 |
| # 11 |
Transocean Ltd. |
3,152 |
21,804 |
| # 12 |
Par Pacific Holdings, Inc. |
3,125 |
2,134 |
| # 13 |
Marathon Oil Corporation |
3,086 |
17,956 |
| # 14 |
EQT Corporation |
3,059 |
18,113 |
| # 15 |
Diamondback Energy, Inc. |
2,813 |
17,619 |
| # 16 |
Continental Resources, Inc. |
2,586 |
14,633 |
| # 17 |
Southwestern Energy Company |
2,308 |
5,160 |
| # 18 |
Nabors Industries Ltd. |
2,134 |
5,503 |
| # 19 |
Range Resources Corporation |
1,969 |
6,137 |
| # 20 |
Murphy Oil Corporation |
1,967 |
10,621 |
| # 21 |
Oceaneering International, Inc. |
1,828 |
2,046 |
| # 22 |
Cimarex Energy Co |
1,559 |
4,622 |
| # 23 |
Cabot Oil & Gas Corporation |
1,467 |
4,524 |
| # 24 |
Ensco Rowan plc |
1,427 |
12,873 |
| # 25 |
Helmerich & Payne, Inc. |
1,406 |
4,727 |
| # 26 |
PDC Energy, Inc. |
1,339 |
5,238 |
| # 27 |
CNX Resources Corporation |
1,258 |
8,042 |
| # 28 |
Keane Group, Inc. |
1,203 |
1,158 |
| # 29 |
SM Energy Company |
1,127 |
4,976 |
| # 30 |
Patterson-UTI Energy, Inc. |
1,124 |
3,299 |
| # 31 |
HESS MIDSTREAM LP |
1,092 |
3,375 |
| # 32 |
Callon Petroleum Company |
1,033 |
4,363 |
| # 33 |
Liberty Oilfield Services Inc. |
966 |
1,890 |
| # 34 |
Noble Corporation |
964 |
4,264 |
| # 35 |
Gulfport Energy Corporation |
867 |
2,540 |
| # 36 |
Matador Resources Company |
862 |
3,687 |
| # 37 |
Comstock Resources, Inc. |
858 |
4,624 |
| # 38 |
Superior Energy Services, Inc. |
851 |
1,501 |
| # 39 |
Kosmos Energy Ltd. |
804 |
3,868 |
| # 40 |
ProPetro Holding Corp. |
789 |
1,051 |
| # 41 |
Diamond Offshore Drilling, Inc. |
734 |
4,948 |
| # 42 |
Helix Energy Solutions Group, Inc. |
734 |
2,498 |
| # 43 |
QEP Resources, Inc. |
724 |
5,114 |
| # 44 |
Laredo Petroleum, Inc. |
677 |
1,443 |
| # 45 |
Select Energy Services, Inc. |
605 |
875 |
| # 46 |
RPC, Inc. |
598 |
791 |
| # 47 |
Talos Energy, Inc. |
587 |
2,835 |
| # 48 |
Centennial Resource Development, Inc. |
580 |
3,827 |
| # 49 |
Extraction Oil & Gas, Inc. |
558 |
2,025 |
| # 50 |
Northern Oil & Gas Inc |
552 |
872 |
| # 51 |
Magnolia Oil & Gas Corporation |
535 |
1,453 |
| # 52 |
Berry Petroleum Corporation |
524 |
1,420 |
| # 53 |
Core Laboratories N.V. |
487 |
569 |
| # 54 |
Frank's International N.V. |
390 |
817 |
| # 55 |
Tetra Technologies, Inc. |
378 |
1,133 |
| # 56 |
Oasis Midstream Partners LP |
348 |
1,031 |
| # 57 |
W&T Offshore, Inc. |
347 |
941 |
| # 58 |
Black Stone Minerals, L.P. |
343 |
1,244 |
| # 59 |
Mammoth Energy Services, Inc. |
313 |
825 |
| # 60 |
Nine Energy Service, Inc. |
311 |
443 |
| # 61 |
CSI Compressco LP |
302 |
710 |
| # 62 |
Penn Virginia Corporation |
273 |
907 |
| # 63 |
Viper Energy Partners LP |
251 |
2,461 |
| # 64 |
HighPoint Resources Corporation |
250 |
827 |
| # 65 |
U.S. Well Services, Inc. |
244 |
323 |
| # 66 |
Gran Tierra Energy Inc. |
238 |
1,202 |
| # 67 |
Bonanza Creek Energy, Inc. |
218 |
1,183 |
| # 68 |
MIDSTATES PETROLEUM COMPANY, INC. |
202 |
385 |
| # 69 |
Ranger Energy Services, Inc. |
188 |
241 |
| # 70 |
SilverBow Resorces, Inc. |
177 |
583 |
| # 71 |
Blue Dolphin Energy Co |
175 |
69 |
| # 72 |
Halcon Resources Corporation |
148 |
346 |
| # 73 |
Earthstone Energy, Inc. |
145 |
1,005 |
| # 74 |
Vantage Drilling International |
127 |
784 |
| # 75 |
Ion Geophysical Corporation |
123 |
194 |
| # 76 |
Oasis Petroleum Inc. |
120 |
2,159 |
| # 77 |
SandRidge Energy, Inc. |
115 |
261 |
| # 78 |
Ring Energy, Inc. |
113 |
663 |
| # 79 |
Contango Oil & Gas Company |
113 |
170 |
| # 80 |
Nuverra Environmental Solutions, Inc. |
110 |
191 |
| # 81 |
NCS Multistage Holdings, Inc. |
107 |
139 |
| # 82 |
Goodrich Petroleum Corporation |
94 |
205 |
| # 83 |
SUNDANCE ENERGY INC. |
92 |
416 |
| # 84 |
BRIGHAM MINERALS, INC. |
92 |
681 |
| # 85 |
Kimbell Royalty Partners |
90 |
565 |
| # 86 |
Dawson Geophysical Company |
86 |
103 |
| # 87 |
Independence Contract Drilling, Inc. |
83 |
413 |
| # 88 |
Natural Gas Services Group, Inc. |
68 |
307 |
| # 89 |
VAALCO Energy, Inc. |
67 |
141 |
| # 90 |
Sanchez Midstream Partners LP |
57 |
353 |
| # 91 |
Dorchester Minerals, L.P. |
47 |
88 |
| # 92 |
Viking Energy Group, Inc. |
40 |
116 |
| # 93 |
Falcon Minerals Corporation |
39 |
276 |
| # 94 |
Tellurian Inc. |
37 |
293 |
| # 95 |
ENERGY 11, L.P. |
37 |
332 |
| # 96 |
ENERGY RESOURCES 12, L.P. |
35 |
201 |
| # 97 |
Panhandle Royalty Company |
25 |
98 |
| # 98 |
EPSILON ENERGY LTD. |
24 |
87 |
| # 99 |
FTS International, Inc. |
23 |
315 |
| # 100 |
Evolution Petroleum Corporation, Inc. |
22 |
65 |