Britain's final Group One of the Flat season will be run under the new title of the Vertem Futurity Trophy.
Vertem Stockbrokers, founded by prominent racehorse owner John Dance, will back the one-mile contest at Doncaster, which has been staged since 1989 as the Racing Post Trophy.
Established in 1961, the juvenile feature was originally run as the Timeform Gold Cup and, after being the Observer Gold Cup from 1965 to 1975, became the William Hill Futurity in 1976, before again changing its title 29 years ago.
Run in October, five winners of the race have gone on to win the following year's Derby, the most recent of which was Camelot, trained by Aidan O'Brien. The horse also won the 2000 Guineas and was narrowly denied a historic Triple Crown back at Doncaster in the 2012 St Leger.
Announcing a five-year deal, Dance, owner of Group One-winning filly Laurens, said: "Vertem Stockbrokers is all about building something for the future, in our business we aim to provide growth and protection to clients' assets, and in terms of this sponsorship deal not only are we supporting the future stars of the sport, but we are equally delighted to be helping Doncaster develop the future heritage of this historic race by reinstating 'Futurity' in its title.
"We believe this sponsorship, just like our investment aims, will deliver a high quality, long-term relationship with Doncaster and we look forward to a very exciting future working with them."
