Keen Engineering - Byron, Illinois

Peak Innovations Engineering - Machesney Park, Illinois

Safeguard Solar LLC - Aurora, Illinois

Eigerlab - Loves Park, Illinois

Engineering Systems, Inc. (ESi) - Aurora, Illinois

Mid-States Concrete Industries - South Beloit, Illinois

McMahon - Machesney Park, Illinois

Arc Design Resources, Inc. - Machesney Park, Illinois

Ingenium Technologies - Rockford, Illinois

Atrona Test Labs, Inc. - Loves Park, Illinois