A&S BUILDING SYSTEMS, LP. 
AMERICAN BUILDINGS COMPANY
BEHLEN BUILDING SYSTEMS
BUTLER BUILDINGS
CBC STEEL BUILDINGS
CECO BUILDING SYSTEMS
CHIEF BUILDINGS
CURVCO STEEL STRUCTURES
CORLE BUILDING SYSTEMS
GOLDEN GIANT, INC.
GULF STATES MANUFACTURERS
HERITAGE BUILDING SYSTEMS
INLAND BUILDINGS
IRONBUILT STEEL BUILDINGS
KIRBY BUILDING SYSTEMS
LUDWIG BUILDINGS, INC
METALLIC METAL BUILDING COMPANY
NUCOR BUILDING SYSTEMS
OLYMPIA STEEL BUILDINGS
PRIME STEEL BUILDINGS
RIGID BUILDING SYSTEMS
RUFFIN BUILDING SYSTEMS
SOUTHERN STRUCTURES BUILDING SYSTEMS
SPIRCO MANUFACTURING
STAR BUILDING SYSTEMS
STEELOX SYSTEMS INC.
STEEL-SPAN, INC.
TRACHTE BUILDING SYSTEMS
UNITED STRUCTURES OF AMERICA, INC.
VARCO-PRUDEN BUILDINGS
VULCAN STEEL STRUCTURES
WHIRLWIND BUILDING SYSTEMS