Suffolk, Treehouse/Core Spaces, Clark Group, Weis Builders, Summit Contracting Group, Whiting-Turner Contracting, Landmark Construction, McShane Companies, and Big-D Construction top Building Design+Construction's ranking of the nation's largest multifamily housing sector contractors and construction management (CM) firms for 2026, as reported in BD+C's 2026 Giants 400 Report.

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