- Air Liquide
- Alliance Electric
- Apex Piping
- Astra Zeneca
- Bancroft Construction
- Braskem
- Bruce Industrial
- Capuana Construction
- Cecil County Community College
- Charles River
- Croda
- Diamond Materials
- Disabatino Construction
- Dover Air Force Base
- Dow
- DuPont
- DuPont Country Club
- Eastern States
- EDIS
- FMC
- Formcraft
- Fuji Films
- General Electric
- HK Griffith
- Hologic
- IFF
- JJID
- Kent Construction
- KBR
- Marshall industrial Technology
- Master Interiors
- M Davis and Sons
- Merit Mechanical
- Pettinaro Construction
- Plastipak
- Premium Power
- Ray Angelini
- SC & A Construction
- Seiberlich Trane
- Siemens
- Smuckers Construction
- State of Delaware
- Suez Water
- Tri M
- Veltec Incorporated
- University of Delaware
- Whiting-Turner Contracting Co.
- Winterthur Museum and Country Estate