no not yet never
Group of companies is grammatically correct.
The legal status for a group of companies is that it is called a corporate group.
Name of the tata group of companies
Paragon Group of Companies was created in 1985.
Htoo Group of Companies's population is 60,000.
Katz Group of Companies was created in 1990.
Katz Group of Companies's population is 4,400.
The population of Interpublic Group of Companies is 41,000.
The population of Interpublic Group of Companies is 2,009.
Buckeridge Group of Companies was created in 1960.
CERT Group of Companies was created in 1996.
The population of The Crane Group Companies is 1,300.