Capgemini SE is a French multinational information technology (IT) services and consulting company, headquartered in Paris, France.
Amec Foster Wheeler plc was a British multinational consultancy, engineering and project management company headquartered in London, United Kingdom. In October 2017, it was acquired by Wood Group.
Jacobs Solutions Inc. is an American international technical professional services firm. The company provides engineering, technical, professional and construction services, as well as scientific and specialty consulting for a broad range of clients globally, including companies, organizations, and government agencies. Jacobs has consistently ranked No. 1 on both Engineering News-Record (ENR)'s 2018, 2019, 2020, 2021, 2022 and 2023 Top 500 Design Firms and Trenchless Technology’s 2018, 2019, 2020 and 2021 Top 50 Trenchless Engineering Firms. Its worldwide annual revenue reached over $14 billion in the 2021 fiscal year, and earnings rose to $477 million.
WSP USA, formerly Parsons Brinckerhoff, is an American multinational engineering and design firm. The firm operates in the fields of strategic consulting, planning, engineering, construction management, energy, infrastructure and community planning. It is a subsidiary of WSP Global.
CH2M, earlier CH2M Hill, was an engineering company that provided consulting, design, construction, and operations services for corporations and governments. The company was organized in Corvallis, Oregon, and headquartered at 9191 South Jamaica Street, Englewood, Colorado. In December 2017, the company was acquired by Jacobs Engineering Group.
Parsons Corporation is an American technology-focused defense, intelligence, security, and infrastructure engineering firm headquartered in Chantilly, Virginia. The company was founded in 1944.
AECOM is an American multinational infrastructure consulting firm headquartered in Dallas, Texas.
Atkins was a British multinational construction, design, engineering and business services company. It was formerly listed on the London Stock exchange and had a London headquarters. During July 2017 the company was bought by SNC-Lavalin in a £2.1 billion deal which subsequently renamed to AtkinsRéalis in 2023.
WSP Global Inc. is a Canadian consulting firm working mostly in the built environment. It was created in 2012, following Montreal-based Genivar's takeover of British firm WSP Group plc. It is listed on the Toronto Stock Exchange. After the purchase of New York-headquartered professional services firm Parsons Brinckerhoff in October 2014, WSP effectively became one of the largest professional services firms in the world, with approximately 66,500 employees in 500 offices serving in 40 countries.
Rambøll Group A/S, also known as "Ramboll", is a Danish multinational architecture, engineering, and consulting company. In the past 25 years, the company has expanded from being a business mainly focused on the Nordic region, to having offices in more than 35 countries, with more than 18,000 employees working on projects across the world. Much of the company's activity is centred on Europe, North America, but also in emerging markets. Ramboll has been listed among the world's top 15 international design firms in 2023.
HDR, Inc. is an American design and engineering company based in Omaha, Nebraska.
Stantec Inc. is an international professional services company in the design and consulting industry. The company was founded in 1954, as D. R. Stanley Associates in Edmonton, Alberta, Canada. Stantec provides professional consulting services in planning, engineering, architecture, interior design, landscape architecture, surveying, environmental sciences, project management, and project economics for infrastructure and facilities projects. The company provides services on projects around the world, with over 30,000 employees operating out of more than 450 locations in North America and across offices on six continents.
Mouchel Group, originally known as L. G. Mouchel & Partners Ltd, was an infrastructure and business services company headquartered in Woking, United Kingdom. It provided advisory, design, project delivery and managed services associated with infrastructure and business services across the highways and transportation, local government, emergency services, property, health, education and utility markets across the world.
Macquarie Group Limited is an Australian multinational investment banking and financial services group headquartered in Sydney and listed in Australia on the ASX. Macquarie's investment banking division is Australia's top-ranked mergers and acquisitions adviser with more than A$871 billion in assets under management and is the world's largest infrastructure asset manager.
John Grill AO was the founder and chief executive officer of Australian-based engineering company, Worley.
Tetra Tech, Inc. is an American consulting and engineering services firm based in Pasadena, California. The company provides consulting, engineering, program management, and construction management services in the areas of water, environment, infrastructure, resource management, energy, and international development. Specific services for consulting and engineering projects include applied science, information technology, engineering, design, construction management, and operations and maintenance.
UXC Ltd is an Australian company owned by DXC Technology, which operates in the IT services industry with over 3,000 employees in the private and public sectors across Australasia. UXC is composed of three distinct internal groups in various industry segments.
MWH Global Inc. was a global water and natural resources firm providing technical engineering, construction services and consulting services. In 2016, MWH was acquired by Stantec Consulting Inc. The firm provided planning, design and construction management for water and natural resources projects around the world. The firm was headquartered in Broomfield, a suburb of the Denver metropolitan area in the state of Colorado of the United States, with operations in 35 countries. As of May 2015, MWH Global had a global staff of approximately 7,000 employees including builders, engineers, architects, geologists, operators, project managers, business consultants, scientists, technologists, and regulatory experts. MWH was listed as the 15th-largest employee-owned company in the United States.
Egis is an international company active in the consulting, construction engineering and mobility service sectors that design and operate intelligent infrastructure and buildings. Egis operates in 120 countries and has 18,000 employees.
Arcadis NV is a global design, engineering and management consulting company based in the Zuidas, Amsterdam, Netherlands. It currently operates in excess of 350 offices across 40 countries. The company is a member of the Next 150 index.
A$8,774 million (2021) [3] 
