Established in 1909 in Belgium, the BESIX Group (BESIX) is a global multi-service group offering engineering, procurement and construction services. BESIX operates in the construction, real estate and concession sectors of 20 countries. Their core construction competencies include buildings, infrastructure and environmental projects, industrial civil engineering, maritime and port works and real estate development.

In addition to EPC services, BESIX is active in real estate development and holds concessions in several Public Private Partnerships (PPP) and 'design, build, finance, and maintain/operate' contracts, through which it develops, operates and maintains projects.

In 2004, OCI SAE acquired a 50% shareholding in the BESIX Group in a joint leverage buyout in partnership with BESIX management.