  | 
            
              
              ION Geophysical Corporation
               IO 
              
             | 
            
              $ 0.35 | 
            
            
              
              -6.68 % | 
              
            
            
              
              $ 10.4 M | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              TOTAL SE
               TOT 
              
             | 
            
              $ 48.3 | 
            
            
              - | 
            
            
              
              $ 128 B | 
              
            
            
            NYSE | 
            
            
              
               France | 
              
            
          
        
          
        
          
              | 
            
              
              NCS Multistage Holdings
               NCSM 
              
             | 
            
              $ 41.11 | 
            
            
              
              12.02 % | 
              
            
            
              
              $ 102 M | 
              
            
            
            Nasdaq Global Select Market | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              National Energy Services Reunited Corp.
               NESR 
              
             | 
            
              $ 12.48 | 
            
            
              
              -1.11 % | 
              
            
            
              
              $ 1.19 B | 
              
            
            
            Nasdaq Capital Market | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Natural Gas Services Group
               NGS 
              
             | 
            
              $ 28.06 | 
            
            
              
              0.63 % | 
              
            
            
              
              $ 346 M | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Nine Energy Service
               NINE 
              
             | 
            
              $ 0.54 | 
            
            
              
              -2.99 % | 
              
            
            
              
              $ 16.4 M | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              NOV 
               NOV 
              
             | 
            
              $ 14.99 | 
            
            
              
              2.67 % | 
              
            
            
              
              $ 5.88 B | 
              
            
            
            NYSE,SPB | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              North European Oil Royalty Trust
               NRT 
              
             | 
            
              $ 6.13 | 
            
            
              
              -3.16 % | 
              
            
            
              
              $ 56.3 M | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Exterran Corporation
               EXTN 
              
             | 
            
              $ 4.58 | 
            
            
              - | 
            
            
              
              $ 153 M | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              PetroChina Company Limited
               PTR 
              
             | 
            
              $ 46.85 | 
            
            
              
              -0.51 % | 
              
            
            
              
              $ 140 B | 
              
            
            
            NYSE | 
            
            
              
               China | 
              
            
          
        
          
        
          
              | 
            
              
              Baker Hughes Company
               BKR 
              
             | 
            
              $ 23.94 | 
            
            
              
              -0.25 % | 
              
            
            
              
              $ 25 B | 
              
            
            
            NYSE,SPB | 
            
            
              - | 
            
          
        
          
        
          
              | 
            
              
              Cypress Environmental Partners, L.P.
               CELP 
              
             | 
            
              $ 0.49 | 
            
            
              - | 
            
            
              
              $ 6.04 M | 
              
            
            
            NYSE | 
            
            
              - | 
            
          
        
          
        
          
              | 
            
              
              Seacor Holdings Inc.
               CKH 
              
             | 
            
              $ 41.5 | 
            
            
              
              0.22 % | 
              
            
            
              
              $ 851 M | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Frank's International N.V.
               FI 
              
             | 
            
              $ 3.15 | 
            
            
              
              7.14 % | 
              
            
            
              
              $ 120 M | 
              
            
            
            NYSE | 
            
            
              - | 
            
          
        
          
        
          
              | 
            
              
              FTS International, Inc.
               FTSI 
              
             | 
            
              $ 26.04 | 
            
            
              
              -0.61 % | 
              
            
            
              
              $ 366 M | 
              
            
            
            NYSE American | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Schlumberger Limited
               SLB 
              
             | 
            
              $ 37.06 | 
            
            
              
              2.76 % | 
              
            
            
              
              $ 52.7 B | 
              
            
            
            NYSE,SPB | 
            
            
              
               France | 
              
            
          
        
          
        
          
              | 
            
              
              RigNet, Inc.
               RNET 
              
             | 
            
              $ 9.6 | 
            
            
              
              -2.24 % | 
              
            
            
              
              $ 202 M | 
              
            
            
            Nasdaq Global Select Market | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              TETRA Technologies
               TTI 
              
             | 
            
              $ 7.07 | 
            
            
              
              0.21 % | 
              
            
            
              
              $ 928 M | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Mammoth Energy Services
               TUSK 
              
             | 
            
              $ 2.13 | 
            
            
              
              4.17 % | 
              
            
            
              
              $ 102 M | 
              
            
            
            Nasdaq Global Select Market | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Cactus
               WHD 
              
             | 
            
              $ 44.07 | 
            
            
              
              -0.32 % | 
              
            
            
              
              $ 3.52 B | 
              
            
            
            NYSE,SPB | 
            
            
              - | 
            
          
        
          
        
          
              | 
            
              
              China Petroleum & Chemical Corporation
               SNP 
              
             | 
            
              $ 45.66 | 
            
            
              - | 
            
            
              
              $ 550 B | 
              
            
            
            NYSE | 
            
            
              
               China | 
              
            
          
        
          
        
          
              | 
            
              
              NexTier Oilfield Solutions 
               NEX 
              
             | 
            
              $ 10.61 | 
            
            
              - | 
            
            
              
              $ 2.58 B | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              TechnipFMC plc
               FTI 
              
             | 
            
              $ 42.19 | 
            
            
              
              1.98 % | 
              
            
            
              
              $ 18.1 B | 
              
            
            
            NYSE,SPB | 
            
            
              - | 
            
          
        
          
        
          
              | 
            
              
              Newpark Resources
               NR 
              
             | 
            
              $ 7.27 | 
            
            
              
              -4.59 % | 
              
            
            
              
              $ 628 M | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Archrock
               AROC 
              
             | 
            
              $ 25.52 | 
            
            
              
              0.99 % | 
              
            
            
              
              $ 4.14 B | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              YPF Sociedad Anónima
               YPF 
              
             | 
            
              $ 36.93 | 
            
            
              
              1.43 % | 
              
            
            
              
              $ 5.75 B | 
              
            
            
            NYSE | 
            
            
              
               Argentina | 
              
            
          
        
          
        
          
              | 
            
              
              Exxon Mobil Corporation
               XOM 
              
             | 
            
              $ 114.21 | 
            
            
              
              -0.17 % | 
              
            
            
              
              $ 491 B | 
              
            
            
            NYSE,SPB | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Superior Drilling Products
               SDPI 
              
             | 
            
              $ 1.01 | 
            
            
              - | 
            
            
              
              $ 30 M | 
              
            
            
            NYSE American | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              U.S. Silica Holdings
               SLCA 
              
             | 
            
              $ 15.49 | 
            
            
              
              -0.06 % | 
              
            
            
              
              $ 1.19 B | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Dril-Quip
               DRQ 
              
             | 
            
              $ 15.41 | 
            
            
              
              -3.51 % | 
              
            
            
              
              $ 527 M | 
              
            
            
            NYSE,SPB | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              MRC Global 
               MRC 
              
             | 
            
              $ 13.83 | 
            
            
              
              -0.79 % | 
              
            
            
              
              $ 1.16 B | 
              
            
            
            NYSE,SPB | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              DMC Global 
               BOOM 
              
             | 
            
              $ 8.03 | 
            
            
              
              -0.37 % | 
              
            
            
              
              $ 158 M | 
              
            
            
            Nasdaq Global Select Market,SPB | 
            
            
              
               USA | 
              
            
          
        
          
        
          
        
          
              | 
            
              
              Solaris Oilfield Infrastructure
               SOI 
              
             | 
            
              $ 11.32 | 
            
            
              
              -0.88 % | 
              
            
            
              
              $ 498 M | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Dawson Geophysical Company
               DWSN 
              
             | 
            
              $ 2.06 | 
            
            
              
              4.57 % | 
              
            
            
              
              $ 63.6 M | 
              
            
            
            Nasdaq Global Select Market | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Matrix Service Company
               MTRX 
              
             | 
            
              $ 15.14 | 
            
            
              
              0.8 % | 
              
            
            
              
              $ 420 M | 
              
            
            
            Nasdaq Global Select Market | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Helix Energy Solutions Group
               HLX 
              
             | 
            
              $ 6.87 | 
            
            
              
              2.23 % | 
              
            
            
              
              $ 1.03 B | 
              
            
            
            NYSE | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Adams Resources & Energy
               AE 
              
             | 
            
              $ 37.98 | 
            
            
              - | 
            
            
              
              $ 96.3 M | 
              
            
            
            NYSE American | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Gulf Island Fabrication
               GIFI 
              
             | 
            
              $ 7.97 | 
            
            
              
              1.6 % | 
              
            
            
              
              $ 124 M | 
              
            
            
            Nasdaq Global Select Market | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Halliburton Company
               HAL 
              
             | 
            
              $ 27.22 | 
            
            
              
              1.42 % | 
              
            
            
              
              $ 24 B | 
              
            
            
            NYSE,SPB | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Profire Energy
               PFIE 
              
             | 
            
              $ 2.54 | 
            
            
              - | 
            
            
              
              $ 120 M | 
              
            
            
            Nasdaq Global Select Market | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Chevron Corporation
               CVX 
              
             | 
            
              $ 153.9 | 
            
            
              
              -2.42 % | 
              
            
            
              
              $ 279 B | 
              
            
            
            NYSE,SPB | 
            
            
              
               USA | 
              
            
          
        
          
        
          
              | 
            
              
              Eni S.p.A.
               E 
              
             | 
            
              $ 36.59 | 
            
            
              
              -0.89 % | 
              
            
            
              
              $ 109 B | 
              
            
            
            NYSE | 
            
            
              
               Italia | 
              
            
          
        
          
        
          
              | 
            
              
              Imperial Oil Limited
               IMO 
              
             | 
            
              $ 89.66 | 
            
            
              
              1.64 % | 
              
            
            
              
              $ 47.5 B | 
              
            
            
            NYSE American | 
            
            
              
               Canada | 
              
            
          
        
          
        
          
              | 
            
              
              NOW 
               DNOW 
              
             | 
            
              $ 14.64 | 
            
            
              
              -0.48 % | 
              
            
            
              
              $ 1.56 B | 
              
            
            
            NYSE,SPB | 
            
            
              - | 
            
          
        
          
        
          
              | 
            
              
              Core Laboratories N.V.
               CLB 
              
             | 
            
              $ 16.08 | 
            
            
              
              0.88 % | 
              
            
            
              
              $ 740 M | 
              
            
            
            NYSE,SPB | 
            
            
              
               Niderland | 
              
            
          
        
          
        
          
              | 
            
              
              Equinor ASA
               EQNR 
              
             | 
            
              $ 23.99 | 
            
            
              
              0.1 % | 
              
            
            
              
              $ 98.4 B | 
              
            
            
            NYSE | 
            
            
              
               Norway | 
              
            
          
        
          
        
          
              | 
            
              
              Ecopetrol S.A.
               EC 
              
             | 
            
              $ 9.4 | 
            
            
              
              0.97 % | 
              
            
            
              
              $ 19.2 B | 
              
            
            
            NYSE | 
            
            
              
               Colombia | 
              
            
          
        
          
        
          
              | 
            
              
              North American Construction Group Ltd.
               NOA 
              
             | 
            
              $ 15.42 | 
            
            
              
              -1.28 % | 
              
            
            
              
              $ 413 M | 
              
            
            
            NYSE | 
            
            
              
               Canada | 
              
            
          
        
          
        
          
              | 
            
              
              Liberty Oilfield Services 
               LBRT 
              
             | 
            
              $ 18.36 | 
            
            
              
              1.38 % | 
              
            
            
              
              $ 3.03 B | 
              
            
            
            NYSE | 
            
            
              
               USA |