The NSW Government established the WestConnex Delivery Authority in November 2013 to manage the planning and delivery of the WestConnex projects. The WestConnex Delivery Authority was merged into the NSW Government agency Sydney Motorway Corporation in October 2015, with all project delivery responsibilities moving to the Corporation. 

In May 2017 the NSW Government announced it planned to sell a 51% majority interest in WestConnex. Following an international search for bidders, consortia and advisors were invited to submit binding bids by July 2018. 

Sydney Transport Partners, an Australian-led and 70% Australian owned consortium made up of Transurban, AustralianSuper, Canada Pension Plan Investment Board and Tawreed, was named as the preferred bidder for the 51% majority interest on 31 August 2018, with financial close reached on 27 September 2018. 

On 20 September 2021, Sydney Transport Partners were named as the successful bidder for the remaining 49% of WestConnex. Financial close was reached on 29 October 2021.  Caisse de dépôt et placement du Québec joined Sydney Transport Partners Consortium in 2021. 

Sydney Transport Partners, with Transurban as its operator, works in close partnership with the NSW Government during delivery of WestConnex. 

WestConnex Board:

The WestConnex board is made up of an Independent Chairperson and directors from Sydney Transport Partners.

Board members are:

• Ron Finlay – Independent Chairperson

• Paul Bernath – Sydney Transport Partners

• Elana Rubin – Sydney Transport Partners

• Marcus Hill – Sydney Transport Partners

• Nicole Green – Sydney Transport Partners

• Nicole Stoddart – Sydney Transport Partners
• Tom McKay – Sydney Transport Partners
• Monica Ryu – Sydney Transport Partners
• Jean-Etienne Leroux – Sydney Transport Partners