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Helix Energy Solutions Group, Inc., together with its subsidiaries, an offshore energy services company, provides specialty services to the offshore energy industry in Brazil, the Gulf of Mexico, the East Coast of the United States, North Sea, the Asia Pacific, and West Africa regions. The company operates through four segments: Well Intervention, Robotics, Production Facilities, and Shallow Water Abandonment segments. It engages in the installation of flowlines, control umbilicals, and manifold assemblies and risers; trenching and burial of pipelines; installation and tie-in of riser and manifold assembly; commissioning, testing, and inspection activities; and provision of cable and umbilical lay, and connection services. The company also provides well intervention, intervention engineering, and production enhancement services; coiled tubing operations; inspection, repair, and maintenance of production structures, trees, jumpers, risers, pipelines, and subsea equipment; and related support services. In addition, it offers reclamation and remediation services; well plug and abandonment services; pipeline, cable and umbilical abandonment services; and site inspections. Additionally, the company offers oil and natural gas processing facilities and services; and fast response system, as well as site clearance and subsea support services. Further, it provides offshore oilfield decommissioning and reclamation, project management, engineered solutions, intervention, maintenance, repair, heavy lift, and commercial diving services. It serves independent oil and gas producers and suppliers, pipeline transmission companies, renewable energy companies, and offshore engineering and construction firms. The company was formerly known as Cal Dive International, Inc. and changed its name to Helix Energy Solutions Group, Inc. in March 2006. Helix Energy Solutions Group, Inc. was incorporated in 1979 and is headquartered in Houston, Texas.

National Energy Services Reunited Corp. provides oilfield services to oil and gas companies in the Middle East, North Africa, and internationally. The company's Production Services segment offers hydraulic fracturing services; coiled tubing services, including nitrogen lifting, fishing, milling, clean-out, scale removal, and other well applications; stimulation and pumping services; primary and remedial cementing services; nitrogen services; filtration services, as well as frac tanks and pumping units; and pipeline and industrial services, such as water filling and hydro testing, nitrogen purging, and de-gassing and pressure testing, as well as cutting/welding and cooling down piping/vessels systems. This segment also provides production assurance chemicals; integrated project management projects; artificial lift services; and surface and subsurface safety systems, high-pressure packer systems, flow controls, service tools, expandable liner technology, vacuum insulated tubing technology for steam applications, and engineering capabilities with manufacturing capacity and testing facilities, as well as sources and treats water for oil and gas, municipal, and industrial use. Its Drilling and Evaluation Services segment offers drilling and workover rigs; rigs and integrated services; fishing and remediation solutions; directional and turbines drilling; drilling fluid systems and related technologies; wireline logging; slickline services for removal of scale, wax and sand build-up, setting plugs, changing out gas lift valves, and fishing and other well applications; and well testing services to measure solids, gas, and oil and water produced from well, as well as rents drilling tools. This segment also provides oilfield solutions for thru-tubing intervention; tubular running services; and a range of wellhead products, flow control equipment, and frac equipment. National Energy Services Reunited Corp. was incorporated in 2017 and is headquartered in Houston, Texas.

As of September 1, 2023, NexTier Oilfield Solutions Inc. was acquired by Patterson-UTI Energy, Inc. NexTier Oilfield Solutions Inc., through its subsidiaries, provides well completion and production services in various active and demanding basins. The company operates in two segments, Completion Services, and Well Construction and Intervention Services. The Completion Services segment offers hydraulic fracturing services to enhance production of oil and natural gas from formations with low permeability and restricted flow of hydrocarbons; wireline services; and perforating, pumpdown, pipe recovery, pressure pumping, and wellsite make-up and pressure testing services. This segment is also involved in the sand hauling, wellsite storage, and last mile logistics activities. The Well Construction and Intervention Services segment provides cementing services that incorporate custom engineered mixing and blending equipment to ensure precision and accuracy in providing annulus isolation and hydraulic seal, while protecting fresh water zones from its customers' zone of interest; and engineering software and technical guidance for remedial cementing applications, and acidizing to optimize the performance of its customers' wells. It serves integrated and large independent oil and natural gas exploration and production companies in the United States and internationally. NexTier Oilfield Solutions Inc. was founded in 1973 and is headquartered in Houston, Texas.

Oceaneering International, Inc. provides engineered services and products, and robotic solutions to the offshore energy, defense, aerospace, manufacturing, and entertainment industries worldwide. It operates through Subsea Robotics, Manufactured Products, Offshore Projects Group, Integrity Management & Digital Solutions, and Aerospace and Defense Technologies segments. The company offers remotely operated vehicles (ROVs) for drill support and vessel-based services, including subsea hardware installation, construction, pipeline inspection, survey and facilities inspection, maintenance, and repair; ROV tooling; and survey services, such as hydrographic survey, positioning services, and autonomous underwater vehicles for geoscience. It also provides distribution and connection systems, including production control umbilicals and field development hardware, pipeline connection, and repair systems to the energy industry; and autonomous mobile robotic technology and entertainment systems to various industries. In addition, the company offers subsea installation and intervention, including riserless light well intervention inspection, maintenance, and repair services; installation and workover control systems, and ROV workover control systems; diving services; project management and engineering; and drill pipe riser services and systems, and wellhead load relief solutions. Further, it provides asset integrity management, software and analytical solutions for the bulk cargo maritime industry, and software, digital, and connectivity solutions for the energy industry, as well as government services and products, including engineering and related manufacturing in defense and space exploration activities to the United States' government agencies and their prime contractors. Oceaneering International, Inc. was founded in 1964 and is headquartered in Houston, Texas.

ProPetro Holding Corp. operates as an integrated oilfield services company. The company provides hydraulic fracturing, wireline, cementing, and other complementary oilfield completion services to upstream oil and gas companies in the Permian Basin. ProPetro Holding Corp. was founded in 2007 and is headquartered in Midland, Texas.