Comfort Systems USA, Inc., together with its subsidiaries, provides mechanical and electrical installation, renovation, maintenance, repair, and replacement services for the mechanical and electrical services industry in the United States. It operates through two segments, Mechanical and Electrical. The company offers heating, ventilation, and air conditioning systems, as well as plumbing, electrical, piping and controls, off-site construction, monitoring, and fire protection. It also engages in the design, engineering, integration, installation, and start-up of mechanical, electrical, and plumbing (MEP) and related systems in new buildings; and renovation, expansion, maintenance, monitoring, repair, and replacement of MEP systems in existing buildings. In addition, the company provides remote monitoring of power usage, temperature, pressure, humidity and air flow for MEP and other building systems. It serves building owners and developers, general contractors, architects, consulting engineers, and property managers in the commercial, industrial, and institutional MEP markets. Comfort Systems USA, Inc. was founded in 1917 and is headquartered in Houston, Texas.

Flowserve Corporation designs, manufactures, distributes, and services industrial flow management equipment in the United States, Canada, Mexico, Europe, the Middle East, Africa, and the Asia Pacific. It operates through Flowserve Pump Division (FPD) and Flow Control Division (FCD) segments. The FPD segment offers custom and pre-configured pumps and pump systems, mechanical seals, auxiliary systems, replacement parts, upgrades, and related aftermarket services; and equipment services, including installation and commissioning services, seal systems spare parts, repairs, advanced diagnostics, re-rate and upgrade solutions, retrofit programs, and machining and asset management solutions, as well as manufactures a gas-lubricated mechanical seal for use in high-speed compressors for gas pipelines and in the oil and gas production and process markets. The FCD segment provides engineered and industrial valve and automation systems, including isolation and control valves, actuation, controls, and related equipment; and equipment maintenance services for flow control systems, including advanced diagnostics, repair, installation, commissioning, retrofit programs, and field machining capabilities. This segment's products are used to control, direct, and manage the flow of liquids, gases, and multi-phase fluids. It primarily serves oil and gas, chemical and pharmaceuticals, power generation, and water management markets, as well as general industries, including mining and ore processing, pulp and paper, food and beverage, and other smaller applications. The company distributes its products through direct sales, distributors, and sales representatives. Flowserve Corporation was founded in 1790 and is headquartered in Irving, Texas.

IES Holdings, Inc. engages in the design and installation of integrated electrical and technology systems, and provides infrastructure products and services in the United States. The Communications segment designs, installs, and maintains network infrastructure within data centers for co-location and managed hosting customers; corporate, educational, financial, hospitality, and healthcare buildings; e-commerce distribution centers; and high-tech manufacturing facilities. This segment also provides design and installation services for audio/visual, telephone, fire, and wireless access and intrusion alarm systems; and engages in designing/building, servicing, and maintaining data network systems. The Residential segment offers electrical installations to single-family housing and multi-family apartments; and cable television installations to residential and light commercial applications, as well as installs residential solar power for new construction and existing residences. The Infrastructure Solutions segment maintains and repairs alternating and direct current electric motors and generators, and power generating and distribution equipment; manufactures custom-engineered metal enclosed bus duct solutions used in power distribution; manufactures custom commercial and industrial generator enclosures; manufactures, re-manufactures, and repairs industrial lifting magnets; and maintains and repairs railroad main and auxiliary generators, main alternators, and traction motors. The Commercial & Industrial segment offers electrical and mechanical design, construction, and maintenance services for office buildings, manufacturing facilities, data centers, chemical plants, refineries, wind farms, solar facilities, municipal infrastructures, and health care facilities. The company was formerly known as Integrated Electrical Services, Inc. and changed its name to IES Holdings, Inc. in May 2016. IES Holdings, Inc. was incorporated in 1997 and is headquartered in Houston, Texas.

Patterson-UTI Energy, Inc., through its subsidiaries, engages in the provision of contract drilling services to oil and natural gas operators in the United States and internationally. It operates through three segments: Drilling Services, Completion Services, and Drilling Products. The Contract Drilling Services segment provides contract and directional drilling services in onshore oil and natural gas basins, as well as engages in the service and re-certification of equipment for drilling contractors, and provision of electrical controls and automation to the energy, marine and mining industries. The Completion Services segment offers services for hydraulic fracturing, wireline and pumping, completion support, and cementing; and involved in the power solutions natural gas fueling, and logistics and storage businesses. The Drilling Products segment manufactures and distributes drill bits for energy and mining markets. It also provides software and services, such as MWD Survey FDIR, a data analytics technology to analyze MWD survey data in real-time and identify the position of a well; HiFi Nav, which enhances FDIR by targeting improved vertical placement of the directional well within the reservoir; HiFi Guidance, utilizes trajectory optimization to determine optimal steering recommendations and placement within the reservoir; and rents oilfield tools. The company was founded in 1978 and is headquartered in Houston, Texas.

Oil States International, Inc., through its subsidiaries, provides engineered capital equipment and products for the energy, industrial, and military sectors worldwide. The company operates through three segments: Well Site Services, Downhole Technologies, and Offshore/Manufactured Products. The Well Site Services segment offers a range of equipment and services that are used to drill for, establish, and maintain the flow of oil and natural gas from a well throughout its lifecycle. It also provides wireline support, frac stacks, isolation tools, downhole and extended reach activity, well testing and flowback operations, sand control, and land drilling services. The Downhole Technologies segment provides oil and gas perforation systems, and downhole tools in support of completion, intervention, wireline, and well abandonment operations. This segment also designs, manufactures, and markets its consumable engineered products to oilfield service, and exploration and production companies. The Offshore/Manufactured Products segment designs, manufactures, and markets capital equipment utilized on floating production systems, subsea pipeline infrastructure, and offshore drilling rigs and vessels. Its products include flexible bearings, advanced connector systems, high-pressure riser systems, managed pressure drilling systems, deepwater mooring systems, cranes, subsea pipeline products, and blow-out preventer stack integration products. This segment also provides short-cycle products, such as valves, elastomers, and other specialty products that are used in the land-based drilling and completion markets; and other products for use in industrial, military, alternative energy, and other applications. In addition, it offers specialty welding, fabrication, cladding and machining, offshore installation, and inspection and repair services. The company was incorporated in 1995 and is headquartered in Houston, Texas.

Gulf Island Fabrication, Inc., together with its subsidiaries, operates as a fabricator of steel structures and modules in the United States. It operates through Services, Fabrication, and Shipyard divisions. The company provides maintenance, repair, construction, scaffolding, coatings, welding enclosures, and other specialty services on offshore platforms, inland structures, and industrial facilities; services required to connect production equipment and service modules, and equipment on offshore platforms; project management and commissioning services; hookup services; and civil construction and staffing services to the industrial and energy sectors, as well as undertakes municipal and drainage projects, including pump stations, levee reinforcement, bulkheads, and other public works. It also fabricates modules, skids, and piping systems for onshore refining, petrochemical, liquified natural gas (LNG), industrial, and offshore facilities; foundations, secondary steel components, and support structures for alternative energy developments and coastal mooring facilities; offshore production platforms and associated structures, including jacket foundations, piles, and topsides for fixed production and utility platforms, as well as hulls and topsides for floating production and utility platforms; and other complex steel structures and components. In addition, the company fabricates newbuild marine vessels and provides marine repair and maintenance services. The company serves international energy producers; refining, petrochemical, LNG, industrial, and power operators; and engineering, procurement, and construction companies. Gulf Island Fabrication, Inc. was incorporated in 1985 and is headquartered in The Woodlands, Texas.

Pioneer Power Solutions, Inc., together with its subsidiaries, design, manufacture, integrate, refurbish, distribute, sell, and service electric power systems, distributed energy resources, power generation equipment, and mobile EV charging solutions. The company operates through Electrical Infrastructure Equipment and Critical Power Solutions segments. The Electrical Infrastructure Equipment segment provides electric power systems that help customers effectively and efficiently protect, control, transfer, monitor, and manage their electric energy requirements. It also offers e-Bloc power systems, power systems, and circuit protective equipment related products. The Critical Power Solutions segment provides power generation equipment maintenance, repairs, remote monitoring, and equipment services, and EV charging solutions. This segment offers suite generator on a truck and power generation equipment, and repair, maintenance, and support services. Pioneer Power Solutions, Inc. serves utility, industrial, and commercial markets. Pioneer Power Solutions, Inc. was formerly known as Pioneer Transformers Ltd. and changed its name to Pioneer Power Solutions, Inc. in December 2009. The company was founded in 2008 and is headquartered in Fort Lee, New Jersey. Pioneer Power Solutions, Inc. operates as a subsidiary of Provident Pioneer Partners, L.P.

Camber Energy, Inc. provides custom energy and power solutions to commercial and industrial clients in North America. The company operates through two segments, Power Generation and Oil and Gas Exploration. It manufactures and supplies power generation products, services, and custom energy solutions; clean-tech energy systems, including combined heat and power, tier 4 final diesel, and natural gas industrial engines, solar, wind, and storage; designs and assembles electrical control equipment, such as switch gear, synchronization and paralleling gear, distribution, bi-fuel, and complete power generation production controls; and clean energy and carbon-capture systems to generate clean electricity. The company also engages in developing, patent pending, electric transmission, and distribution of open conductor detection systems to detect a break in a transmission line, distribution line, or coupling failure. In addition, it engages in the exploration and production of properties in central and southern United States. Camber Energy, Inc. is headquartered in Houston, Texas.