Since 1999, Doxiadis Associates is part of Metrotech Group, which also includes the following companies:
- Metrotech S.A., a consulting company specialized in project and construction management and concession projects. Currently Metrotech S.A. is acting as Group's Holding Company
- Sotiropoulos and Associates S.A. and Geomichaniki S.A., two companies specialized in geotechnical investigation and design
- Ergotest S.A., a company specialized in Quality Control / Laboratory Testing and in Quality Assurance of Civil Engineering Works
