Addison Lee has acquired US rival Flyte Tyme for a reported $25 million.
Europe’s largest private hire operator said the move would boost global sales to £400 million and follows a similar deal last year when it acquired rival Tristar for £30 million.
Flyte Tyme already operates over 17,000 vehicles in the US with a turnover of £53 million and 525 staff and 375 drivers.
Its services include airport transfers, events transport services and shuttle services.
Andy Boland, chief executive of Addison Lee, said the Flyte Tyme deal was an important moment for the executive car industry.
"Flyte Tyme has deep expertise and an extensive affiliate network in the United States," he said.
"By combining Flyte Tyme's North American presence with Tristar's global operations and Addison Lee's digital booking platforms, we can now truly lead the ground transportation industry providing, for the first time, global managed ground transportation services through a single platform."