Sun Stream

Sun Stream
Sire	Hyperion
Grandsire	Gainsborough
Dam	Drift
Damsire	Swynford
Sex	Mare
Foaled	1942
Country	United Kingdom
Colour	Chestnut
Breeder	Edward Stanley, 17th Earl of Derby
Owner	Edward Stanley, 17th Earl of Derby
Trainer	Walter Earl
Record	7: 5–1–1
Earnings	£15,670
Major wins
Queen Mary Stakes (1944) 1000 Guineas (1945) Epsom Oaks (1945)

Sun Stream (1942–January 1959) was a British Thoroughbred racehorse and broodmare, best known for winning two Classics in 1945. The filly won five times from seven races in a track career which lasted from spring 1944 until June 1945. As a two-year-old in 1944 she won three races including the Queen Mary Stakes. After being beaten on her three-year-old debut she won the 1000 Guineas over one mile at Newmarket and a substitute Oaks over one and a half miles at the same course a month later. After her second classic win she was retired to stud, where her record as a broodmare was disappointing.

Sun Stream was a chestnut mare with a white blaze and white hind feet. She was bred, like both her parents by her owner Edward Stanley, 17th Earl of Derby, the seven-time British flat racing Champion Owner. She was sired by Hyperion, who won the Epsom Derby and the St Leger Stakes for Lord Derby in 1933 and went on to become an internationally significant sire: Sun Stream's successes enabled Hyperion to claim the fourth of his six sires' championships in 1945. Sun Stream's dam, Drift, won four races including the Atalanta Stakes and became a successful broodmare, producing the 1000 Guineas winner Tideway and Heliopolis, a full brother to Sun Stream who was twice Leading sire in North America.

Lord Derby sent the filly to his private trainer Walter Earl at his Stanley House stable in Newmarket, Suffolk.

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