> ASSOCIATED ENVIRONMENTAL INDUSTRIES, CORP. Oklahoma Since: 1992 ASSOCIATED ENVIRONMENTAL INDUSTRIES, CORP.
> ERNEST C. ANDERSON GRAVEL & READY MIXED, INC. Minnesota Since: 1972 ERNEST C. ANDERSON GRAVEL & READY MIXED, INC.
> HUBERT E. BUTLER CONSTRUCTION COMPANY, L.L.C. Connecticut Since: 2000 HUBERT E. BUTLER CONSTRUCTION COMPANY, L.L.C.
> GREEN DIAMOND PERFORMANCE MATERIALS, INC Oregon Since: 2017 GREEN DIAMOND PERFORMANCE MATERIALS, INC
