AES-Marconi has a large client base but some of these clients are listed below:
- Allianz
- Exxon
- Oaklee Housing Association
- Bank of Ireland
- NFU
- Axa
- Halifax
- Housing Executive
- Legal & General
- Nationwide
- NHBC
- Northern Bank
- Norwich Union
- OAMPS
- Prestige
- Prudential
- Royal Sun Alliance
- Ulster Bank
- Zurich
- Local Councils
- Environmental Agency
- Department of the Environment
- Housing Associations