- Federal Marine Terminals – Portage, Indiana
- Ryba Marine – Cheboygan, Michigan
- Great Lakes Maritime Academy – Traverse City, Michigan
- Donjon Shipyard – Erie, Pennsylvania
- Nicholson Terminals – Ecorse, Michigan
- Capacity Marine – Mahwah, New Jersey
- Verplank Dock Company – Ferrysburg, Michigan
- Kokosing Industrial, Durocher Marine Division – Cheboygan, Michigan
- Barr Engineering – Ann Arbor, Michigan
- Via Rail Engineering, Inc. – Maribel, Wisconsin
- Innovative Signal Analysis – Richardson, Texas
- Burns & McDonnell – Duluth, Minnesota
- PND Engineering – Houston, Texas
- Ramboll – Milwaukee, Wisconsin
- Fincantieri Marine Group – Wisconsin
- Warner Petroleum – Detroit, Michigan
- BKD CPAs & Advisors – Erie, Pennsylvania
- JD Fields & Company – Oak Brook, Illinois
- Foth Infrastructure and Environment – Franklin, Wisconsin
- Metro Ports – Portage, Indiana
- Kinder Morgan Terminals – Argo, Illinois
- Edgewater Resources – Madison, Wisconsin
- Evans Transportation Services – Delafield, Wisconsin
- 5R Enterprises – Morris, Illinois
- Equipment Depot – Itasca, Illinois
- Ballard Marine Construction – Washougal, Washington
- VAA Engineering – Plymouth, Minnesota
- Tranport Properties – Gary, Indiana
