First run in 2007, the Kempton Mares' Hurdle was won by Refinement who was trained by Jonjo O'Neill and ridden by AP McCoy. The race, originally called Friends of Nigel Clark Mares' Only Hurdle, was set up in memory of the course's steward Nigel Clark. Since 2008 the race has had a number of sponsors including Starlight Children's Foundation, Ladbrokes and Coolmore Stud until 2012 when OLBG.com became the race sponsors and the race became known as the OLBG Mares' Hurdle. Racing TV have sponsored the race since 2019.
