- Crowley Maritime – 65 Vessels
- Foss Maritime – 52 Vessels
- McAllister Towing – 31 Vessels
- Vane Brothers – 31 Vessels
- Kirby Offshore – 24 Vessels
- Moran Towing – 24 Vessels
- American Steamship – 13 Vessels
- Sause Brothers – 12 Vessels
- Overseas Shipholding Group – 10 Vessels
- Interlake Steamship – 9 Vessels
- Young Brothers – 9 Vessels
- Andrie Inc. – 8 Vessels
- Bordelon Marine – 8 Vessels
- Keylakes Shipping – 8 Vessels
- Oceaneering – 7 Vessels
- US Shipping Corp. – 7 Vessels
- AmNav Maritime – 6 Vessels
- Gateway Towing – 6 Vessels
- Grand River Navigation – 6 Vessels
- Lind Marine – 5 Vessels
- Maine Maritime Academy – 5 Vessels
- Curtin Maritime – 4 Vessels
- San Francisco Bar Pilots – 4 Vessels
- Catalina Freight Lines – 3 Vessels
- Hays Tug & Launch – 3 Vessels
- Omega Protein – 3 Vessels
- American Tugs Inc. – 2 Vessels
- Central Marine Logistics – 2 Vessels
- Coastline Marine Towing – 2 Vessels
- Cook Inlet Tug & Barge – 2 Vessels
- Dann Ocean Towing – 2 Vessels
- Kadoke Marine Management – 2 Vessels
- National Response Corporation – 2 Vessels
- Port City Tug – 2 Vessels
- Salmon Bay Barge Line – 2 Vessels
- VanEnkevort Tug and Barge – 2 Vessels
- Brice Marine – 1 Vessel
- C H Phoenix – 1 Vessel
- California Maritime Academy – 1 Vessel
- Calumet River Fleeting – 1 Vessel
- Great Lakes Maritime Academy – 1 Vessel
- Inland Lakes Management – 1 Vessel
- Keystone Shipping – 1 Vessel
- Lake Michigan Carferry – 1 Vessel
- Massachusetts Maritime Academy – 1 Vessel
- Monterey Bay Aquarium Research Inst. – 1 Vessel
- Offshore Logistical – 1 Vessel
- Pere Marquette Shipping – 1 Vessel
- Samson Tug and Barge – 1 Vessel
- Seabulk Towing Offshore – 1 Vessel
- Texas Maritime Academy – 1 Vessel
- Thomas J. Feeney Enterprises – 1 Vessel
