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Sarter Marine Towing, Sturgeon Bay, WI

Sea Service LLC, Superior, WI

Seaway Marine Group, Clayton, NY

Shoreline Contractors Inc., Wellington, OH

Shoreline Sightseeing Co., Chicago, IL

Sixth Great Lake Marine Services, Penetanguishene, ON

Soletanche Bachy Canada, Hamilton, ON

South Shore Dredge & Dock Inc., Lorain, OH

St. James Marine Co., Beaver Island, MI

St. Lawrence Marine & Dredging Ltd., Lansdowne, ON

St. Lawrence Seaway Development Corp., Massena, NY

St. Lawrence Seaway Management Corp., Montreal, QC

St. Marys Cement Inc., Toronto, ON