Jacobs, Fluor, IPS-Integrated Project Services, AECOM, SSOE, Burns & McDonnell, Salas O’Brien, Affiliated Engineers Inc., and EXP high Building Design+Construction’s rating of the nation’s largest science and know-how (S+T) facility engineering and engineering/structure (EA) corporations for 2025, as reported in BD+C’s 2025 Giants 400 Report.