ENGIE (formerly known as GDF SUEZ) is the major shareholder of SMEG with 64% stake, mainly through its branch ENGIE Energy Services. The ENGIE Group is one of the first energy specialists  in the world, present on the whole chain of energy, energy operators in electricity and in natural gas, from upstream to downstream.

With the contribution of its subsidiary and its stakes, SMEG contributes to this good performance and establishes, on a restricted geographical space, a showcase for the businesses of the Group.

The Monegasque State holds 20 % of SMEG'S stake. The state grants SMEG the concession of its activities but controls its application. At the instigation of the HSH, Prince Albert II and the Princely Government have resolutely chosen to move toward sustainable development. It is also one of the key focus points of the new concession which came into force in 2009.

The EDEV holding company is a shareholder of SMEG, with 15 % stake. It is at the heart of the Development branch, created in 2002 by EDF.  This Development branch stimulates the creation of products and new commercial services in order to prefigure tomorrow’s Group.