Soletanche Bachy is a main contractor or partner specialising in geotechnical and civil engineering.

Menard is a geotechnical engineering subcontractor specialising in foundations, ground retention, modification and treatment.

 Nuvia is a nuclear specialist, in both civil and defence sectors, construction and remediation of nuclear facilities.

Freyssinet is a civil/structural subcontractor specialising in prestressing and post-tensioning, stay cables, heavy lifting, structural fittings and remediation.

 The Reinforced Earth Company is a designer and supplier specialising in earth retaining and buried arch tunnel solutions for the civil, military, mining and energy sectors.