A country’s construction industry serves as a backbone to its infrastructure. Knowing who the top players are can lend you invaluable insight, both as a consumer and investor. Here are the top four construction companies that lead the industry based on yearly revenue.

With net revenue of close to $22 billion in 2019, Bechtel stands as the largest construction company in the country. The company has been leading its respective industry since 2016. Bechtel specializes in working on big projects and overseeing them from start to finish. Some of the company’s most noteworthy projects include providing construction, engineering, and project management expertise for the Hoover Dam project in Clark County, NV, and the London City Airport construction in London, UK.

Reporting a total revenue of $15.2 billion, The Turner Corporation specializes in construction management. Headquartered in New York City, the company boasts an impressive portfolio of past projects and clients, including the Madison Square Garden, Harvard University Science & Engineering Complex, and Columbus Crew MLS Stadium. Since its inception in 1092, The Turner Corporation has grown significantly. It is now an organization that employs 10,000+ employees and over 1,500 projects handled every year.

Coming in at third place with total revenue of $11 billion in 2019 is AECOM. Based in Los Angeles, CA, AECOM positions itself as a leader in engineering and design projects that involve clean water and energy. Its 87,000+ employees have been involved in significant projects, including the One World Trade Center in New York and One Shenzhen Bay in China.

The Whiting-Turner Contracting Company is privately held and operated, with total revenue of $9.8 billion. Based in Baltimore, Maryland, the construction company specializes in commercial projects and a variety of projects in education, healthcare, technology, and transportation. They’ve helped build Porsche’s North America headquarters in Atlanta, GA, and the Under Armor Performance Center in Owing Mills, MD.

These are the top four companies you should pay attention to, whether you’re an investor in the construction space or a job seeker looking to work in the industry.