Expedia owns at least the following Travel Companies:
CarRentals.com, CheapTickets, Classic Vacations, Ebookers, Egencia, Expedia.com, Expedia Affiliate Network, Expedia Local Expert, Expedia CruiseShipCenters, Expedia Global Partner Solutions, HomeAway, Hotels.com, Hotwire Group, Orbitz, Travelocity, trivago, Venere.com and wotif.com.
Booking.com owns at least these:
Booking.com, Priceline.com, Agoda.com, Kayak.com, Cheapflights, Rentalcars.com, Momondo, and OpenTable.