The simple answer is no, at least, not yet. The first lady jockey to ride…
Has the Grand National ever resulted in a dead heat?
The Grand National may be the most celebrated steeplechase in the world but is still, essentially, a handicap, in which each horse is allocated a weight according to its ability. In other words, the official rating of each horse represents, in Imperial pounds, the ability of the horse in the eyes of the handicapper.
According to their previous form, which is assessed on a regular, typically weekly, basis, more capable horses are allotted higher official ratings than their less able counterparts, and carry correspondingly higher weights, such that every horse has an equal chance of winning. Consequently, in the eyes of the handicapper, the ideal result of the Grand National, or any other handicap, is a dead-heat among all the participants. Of course, the countless imponderables governing the outcome of any horse race, not least the Grand National, render any such notion completely infeasible in practice.
Indeed, the first official running of the Grand National took place in 1839 and after 172 attempts the race has yet to result in a dead-heat between two horses, never mind more than two. Nevertheless, in 2012, Neptune Collonges edged out Sunnyhillboy by a nose or, in other words, the narrowest possible margin, in the closest finish ever seen at Aintree.