Wayside Group has expanded through acquiring Hertfordshire group Andrew Rowley Toyota.
The purchase adds sites in St Albans and Watford to Wayside's existing business with Volkswagen, Audi, BMW and Mini.
Its dealerships are located throughout Hertfordshire, Bedfordshire, Buckinghamshire and Northamptonshire.
Managing director John Caney said “We are delighted to welcome Toyota to our portfolio as part of our continued growth strategy.
"The Wayside Group believes passionately in exceeding our customers’ expectations and it is our intention to extend this philosophy to our new venture with Toyota in Hertfordshire.”
Employing over 600 people, the Wayside Group last year added BMW and Mini to its Volkswagen and Audi portfolio.