Thoroughbred racing is a sport and industry involving the racing of Thoroughbred horses. It is governed by different national bodies. There are two forms of the sport – flat racing and jump racing, the latter known as National Hunt racing in the UK and steeplechasing in the US. Jump racing can be further divided into hurdling and steeplechasing.
Traditionally, racehorses have been owned by wealthy individuals. It has become increasingly common in the last few decades for horses to be owned by syndicates or partnerships. Notable examples include the 2005 Epsom Derby winner Motivator, owned by the Royal Ascot Racing Club, 2003 Kentucky Derby winner Funny Cide, owned by a group of 10 partners organized as Sackatoga Stable, and 2008 Kentucky Derby winner Big Brown, owned by IEAH stables, a horse racing hedgefund organization.
Historically, most race horses have been bred and raced by their owners. Beginning after World War II, the commercial breeding industry became significantly more important in North America, Europe and Australasia, the result of which being that a substantial portion of Thoroughbreds are now sold by their breeders, either at public auction or through private sales. Additionally, owners may acquire Thoroughbreds by "claiming" them out of a race (see discussion of types of races below).
A horse runs in the unique colours of its owner. These colours must be registered under the national governing bodies and no two owners may have the same colours. The rights to certain colour arrangements ("cherished colours") are valuable in the same way that distinctive car registration numbers are of value. It is said that Sue Magnier (owner of George Washington, Galileo etc.) paid £50,000 for her distinctive dark blue colours. If an owner has more than one horse running in the same race then some slight variant in colours is often used (normally a different coloured cap) or the race club colours may be used.