Vingroup will remain the controlling shareholder of the unit, VCM Services and Trading Development Joint Stock Company, after the deal, GIC said in a statement.
A source familiar with the deal said Credit Suisse acted as the sole advisor to Vingroup.
Vingroup, once a real estate and retail conglomerate, has grown to become Vietnam's largest listed firm with a market capitalisation of more than $16 billion. The company recently launched smartphones and cars, and is also looking to enter the artificial intelligence sector.
Last month, Vingroup applied for a licence to launch an airline next year.
(Reporting by Khanh Vu, Additional reporting by Phuong Nguyen, editing by Louise Heavens)
By Khanh Vu