Booking.com has grown from a small Dutch startup to one of the largest travel ecommerce companies in the world. Part of The Priceline Group NASDAQ PCLN, Booking.com now employs more than 15,000 employees in 198 offices, in 70 countries worldwide.Booking.com has grown from a small Dutch startup to one of the largest travel ecommerce companies in the world. Part of The Priceline Group NASDAQ PCLN, Booking.com now employs more than 15,000 employees in 198 offices, in 70 countries worldwide.