- Federal Marine Terminals – Portage, Indiana
- Ryba Marine – Cheboygan, Michigan
- Great Lakes Maritime Academy – Traverse City, Michigan
- AMI Engineering – Superior, Wisconsin
- Donjon Shipyard – Erie, Pennsylvania
- Nicholson Terminals – Ecorse, Michigan
- DRM Maintenance & Management – Dundee, Michigan
- Capacity Marine – Mahwah, New Jersey
- Verplank Dock Company – Ferrysburg, Michigan
- The Great Lakes Towing Company – Cleveland, Ohio
- Supply Chain Solutions, Inc. – Grand Rapids, Michigan
- Foth Infrastructure and Environmental – Green Bay, Wisconsin
- Kokosing Industrial, Durocher Marine Division – Cheboygan, Michigan
- Barr Engineering – Ann Arbor, Michigan
- Via Rail Engineering, Inc. – Maribel, Wisconsin
