- ABT Associates
- AON Corp.
- Arthur Andersen Consulting (now Accenture)
- Black & Veatch
- Booz Allen & Hamilton, Inc.
- Campbell R. Harvey
- Compagnie Nationale du Rhône (member of the Post-Panamax Consortium)
- Coyne-et-Bellier (member of the Post-Panamax Consortium)
- DHI Water & Environment
- DRI / WEFA, Inc. (subsidiaria de Global Insight)
- Economic Research Associates
- Fearnley Consultants A/S
- Global Insight, Inc.
- Great Lakes Dredge & Dock Company
- Harza Engineering (now Montgomery Watson Harza)
- ICF Kaiser Int. (now ICF International)
- INDESA
- Intracorp Estrategias Empresariales, S.A.
- Japan Bank for International Cooperation (JBIC)
- JETRO
- Louis Berger Group, Inc.
- Mauricio Jenkins
- Mercer Management Consulting
- Merge Global, Inc.
- Moffatt & Nichol Engineers
- Montgomery Watson Harza
- Nathan Associates
- Paragon Consulting
- Parsons Brinckerhoff
- Richardson Lawrie & Associates
- Rockwell Software
- Smithsonian Tropical Research Institute (STRI)
- SSPA Sweden AB
- Syncrolift, Inc.
- Technum (member of the Post-Panamax Consortium)
- Texas A & M University
- Texas Transportation Institute/Stephen Fuller and Tun-Hsiang Yu
- Tractebel Engineering (member of the Post-Panamax Consortium)
- U.S. Arctic Research Commission
- Universidad de Panamá
- URS Holdings
- USACE
- Valuation Research Corp
- WL Delft Hydraulics