SCHLUMBERGER LIMITED/NV HALLIBURTON CO Liberty Oilfield Services Inc. OCEANEERING INTERNATIONAL INC CORE LABORATORIES N V RPC INC National Energy Services Reunited Corp. ProPetro Holding Corp. NEXTIER OILFIELD SOLUTIONS INC. Select Energy Services, Inc. HELIX ENERGY SOLUTIONS GROUP INC North American Construction Group Ltd. FTS International, Inc. Ranger Energy Services, Inc. NATURAL GAS SERVICES GROUP INC U.S. WELL SERVICES, INC. MAMMOTH ENERGY SERVICES, INC. NCS Multistage Holdings, Inc. CSI Compressco LP Recon Technology, Ltd Nuverra Environmental Solutions, Inc. Nine Energy Service, Inc. KLX Energy Services Holdings, Inc. Enservco Corp GENOIL INC UNITED ENERGY CORP /NV/ TRANSACT ENERGY CORP EXPRO GROUP HOLDINGS N.V. BASIC ENERGY SERVICES, INC. ProFrac Holding Corp. Aris Water Solutions, Inc. EXPRO GROUP HOLDINGS N.V. KEY ENERGY SERVICES INC Forbes Energy Services Ltd. SUPERIOR ENERGY SERVICES INC KEY ENERGY SERVICES INC BASIC ENERGY SERVICES, INC. National Energy Services Reunited Corp. U.S. WELL SERVICES, INC.