The Shaw Group, Inc. provides engineering, design, construction, and maintenance services to energy, environmental, infrastructure, and emergency response markets worldwide. The company has four segments: Environmental and Infrastructure (E&I), Energy and Chemicals (E&C), Fabrication and Manufacturing (F&M), and Maintenance. The E&I segment offers various services, including the identification of contaminants in soil, air and water, as well as the subsequent design and execution of remedial solutions; and project and facilities management and other related services for non-environmental construction, watershed restoration, emergency response services, and outsourcing of privatization markets. It primarily serves federal, state, and local agency clients, as well as private sector. The E&C segment provides a range of project-related services, including design, engineering, construction, procurement, technology, and consulting services primarily to the energy and chemical industries. The F&M segment engages in the supply of fabricated piping systems for energy generation facilities; and fabrication of piping systems, as well as provides a range of engineering, procurement, and construction services for chemical customers worldwide. The Maintenance segment offers routine and outage/turnaround maintenance services, including restorative, repair, renovation, modification, and predictive and preventative maintenance services, as well as small project capital construction services, tank design construction and maintenance, insulation, painting, and scaffolding services to customers in the energy and chemical industries. The Shaw Group offers its products and services primarily to multi-national industrial corporations, regulated utilities, independent and merchant energy providers, governmental agencies, and equipment manufacturers. The company was founded in 1987 and is headquartered in Baton Rouge, Louisiana.

AECOM Technology Corporation and its subsidiaries provide professional technical and management support services to government and commercial clients worldwide. It operates in two segments, Professional Technical Services and Management Support Services. The Professional Technical Services segment offers consulting, planning, architecture, engineering, construction management, project management, asset management, environmental services, and design-build services. Its services are used in various areas and industries, including transportation infrastructure; research, testing, and defense facilities; water, wastewater, and other environmental programs; land development; security and communication systems; institutional, mining, industrial, and commercial and energy-related facilities. The Management Support Services segment provides infrastructure management and maintenance, training, logistics, consulting, technical assistance, and systems integration services primarily for agencies of the United States government. This segment's clients consist primarily of national governments; state, regional, and local governments; public and private institutions; and corporations. The company, formerly known as Ashland Technology Corporation, was founded in 1980 and is based in Los Angeles, California.

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Jacobs Engineering Group, Inc. provides technical, professional, and construction services to industrial, commercial, and governmental customers worldwide. It offers project services, including engineering, design, and architectural services. The company designs and engineers modern process plants, including projects for clients in the chemicals and polymers, pharmaceuticals and biotechnology, oil and gas, refining, food and consumer products, and basic resources industries; buildings, such as facilities in the health care, education, and criminal justice markets, as well as other buildings for clients in the private sector; infrastructure projects, including highways, roads, bridges, and other transportation systems, as well as wastewater treatment and similar facilities; technology and manufacturing facilities for clients in the aerospace, automotive, defense, semiconductor, and electronics industries; and pulp and paper plants. It also provides traditional field construction services, environmental remedial construction services, and modular construction technology services. In addition, Jacobs Engineering Group offers operations and maintenance services, such as management and support services, including subcontractors and other on-site personnel; and plant maintenance services. Further, it offers consulting services, such as performing pricing studies, market analyses, and financial projections in determining the feasibility of a project; performing gasoline reformulation modeling; analyzing and evaluating layout and mechanical designs; analyzing automation and control systems; analyzing, designing, and executing biocontainment strategies; developing and performing process protocols with respect to Federal Drug Administration-mandated qualification and validation requirements; and performing geological and metallurgical studies. Jacobs Engineering Group was founded in 1947 and is based in Pasadena, California.