Flatiron Construction Corporation, a subsidiary of Hochtief, is a heavy civil infrastructure contractor headquartered in Broomfield, Colorado, United States.

[4] In 2005, Flatiron began working in Western Canada with their first public-private partnership project, the Park Bridge east of Golden, British Columbia.

[1] Flatiron has been part of a team that has bid on construction packages for the California High-Speed rail and won a contract that was announced on December 12, 2014.

Dragados/Flatiron/Shimmick submitted a bid of $1.23 billion to design and build the 65-mile stretch from the south end of Fresno to near the Tulare-Kings county line and was deemed the “apparent best value” bidder by the California High-Speed Rail Authority.

[14] In 2011, Spain based ACS Group acquired controlling interest in Flatiron parent company Hochtief.