AECOM, Gensler, Stantec, HOK, Arcadis North America, SmithGroup, GPD Group, HNTB, Quinn Evans, and Skidmore, Owings & Merrill top Building Design+Construction's ranking of the nation's largest federal government building architecture and architecture engineering (AE) firms for 2026, as reported in BD+C's 2026 Giants 400 Report.

Source: Building Design+Construction's 2026 Giants 400 Report