Operator Connect Plus (M25) has selected three major highway players: Skanska Construction UK, Jackson Civil Engineering Group and Geoffrey Osborne as well as £25m turnover Dibden-based R&W Civil Engineering as preferred contractors.
The framework agreement will run for four years with an option to extend for a further 24 months.
The programme scope includes a host of civil engineering works including structures, geotech, junction improvements, and technology improvements.
Last year both Skanska and Atkins sold their stakes in the M25 road-widening PFI owned by Connect Plus (M25).
The SPV also comprises Balfour Beatty (40%), which is also said to be looking to sell its stake.