Playful Act is an Thoroughbred

Thoroughbred

The Thoroughbred is a horse breed best known for its use in horse racing. Although the word thoroughbred is sometimes used to refer to any breed of purebred horse, it technically refers only to the Thoroughbred breed...

 racehorse

Horse racing

Horse racing is an equestrian sport that has a long history. Archaeological records indicate that horse racing occurred in ancient Babylon, Syria, and Egypt. Both chariot and mounted horse racing were events in the ancient Greek Olympics by 648 BC...

 and the world's most expensive broodmare. Owned and bred by prominent British owner/breeder Robert Sangster

Robert Sangster

Robert Edmund Sangster was a British businessman, thoroughbred racehorse owner and breeder. He was British flat racing Champion Owner five times and his horses won many major races, including two Epsom Derbys, four Irish Derbys, two French Derbys, three Prix de l'Arc de Triomphes and a Melbourne...

, she was sired by the extremely important Champion Sire

Leading sire in Great Britain & Ireland

The list below shows the leading sire of racehorses in Great Britain and Ireland for each year since 1751. This is determined by the amount of prize money won by the sire's progeny during the season.----- References :* -See also:...

 Sadler's Wells

Sadler's Wells (horse)

Sadler's Wells was a Thoroughbred racehorse that was later a leading sire in France, Great Britain & Ireland and North America during the 1990s. He was foaled in 1981 in the United States, but achieved most of his racing and breeding fame in Europe....

, she was out of the mare

Mare (horse)

A mare is an adult female horse or other equine.In most cases, a mare is a female horse over the age of three, and a filly is a female horse age three and younger. However, in Thoroughbred horse racing, a mare is defined as a female horse more than four years old; in harness racing a mare is a...

 Magnificent Style, a granddaughter of the 1972 Epsom Derby

Epsom Derby

The Derby Stakes, popularly known as The Derby, internationally as the Epsom Derby, and under its present sponsor as the Investec Derby, is a Group 1 flat horse race in Great Britain open to three-year-old thoroughbred colts and fillies...

 winner, Roberto

Roberto (horse)

Roberto was an American-bred Thoroughbred Champion racehorse who competed in Ireland and England.-Background:Roberto was bred by Galbreath at his Darby Dan Farm near Lexington, Kentucky. The son of the successful sire Hail To Reason out of the dam Bramalea, Roberto's grandsire was Turn-To, a...

.

A success in racing at age two, Playful Act had notable wins in the 2004 Fillies' Mile

Fillies' Mile

The Fillies' Mile is a Group 1 flat horse race in Great Britain which is open to two-year-old thoroughbred fillies. It is run at Newmarket over a distance of 1 mile , and it is scheduled to take place each year in late September....

 and May Hill Stakes

May Hill Stakes

The May Hill Stakes is a Group 2 flat horse race in Great Britain which is open to two-year-old thoroughbred fillies. It is run at Doncaster over a distance of 1 mile , and it is scheduled to take place each year in September....

 and was voted the British Champion Two-Year-Old Filly of 2004. She raced at age three with her best result a win in the Group 2

Conditions races

Conditions races are horse races where the weights carried by the runners are laid down by the conditions attached to the race. Weights are allocated according to; the sex of the runners, with female runners carrying less weight than males; the age of the runners, with younger horses receiving...

 Lancashire Oaks

Lancashire Oaks

The Lancashire Oaks is a Group 2 flat horse race in Great Britain open to thoroughbred fillies and mares aged three years or older. It is run at Haydock Park over a distance of 1 mile, 3 furlongs and 200 yards , and it is scheduled to take place each year in early July.-History:The event was...

 and a second place finish to Shawanda in the Irish Oaks

Irish Oaks

The Irish Oaks is a Group 1 flat horse race in Ireland open to three-year-old thoroughbred fillies. It is run at the Curragh over a distance of 1 mile and 4 furlongs , and it is scheduled to take place each year in July....

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Retired to broodmare duty, Playful Act was put up for sale in November 2007 and was purchased by Sheikh Mohammed's

Mohammed bin Rashid Al Maktoum

Mohammed bin Rashid Al Maktoum , also Sheikh Mohammed, , is the Prime Minister and Vice President of the United Arab Emirates , and absolute monarch of Dubai.-Personal life and education:...

 Darley Stud

Darley Stud

Darley Stud is a Thoroughbred breeding operation owned by HH Sheikh Mohammed bin Rashid Al Maktoum, ruler of Dubai and vice-president of the United Arab Emirates. Darley breeds horses in the United Kingdom, Ireland, the United States, Dubai, Japan and Australia....

 operation at the Keeneland breeding stock sale

Keeneland Sales

The Keeneland Sales is an American Thoroughbred auction house in Lexington, Kentucky founded in 1935 as a nonprofit racing/auction entity on 147 acres of farmland west of Lexington, which had been owned by Jack O. Keene...

for a world record price of US$10.5 million.