 Beam was a daughter of Mistrella (foaled 1907), a British broodmare whose other descendants included Light Brocade, Lady Capulet and the Ascot Gold Cup winners Foxhunter and Trimdon.As a two-year-old in 1926, Beam ran four times and recorded her only success on her final appearance when she won the Houghton Stakes at Newmarket Racecourse winning by a short head from Cartona.She had earlier finished third to the colt Shian Mor in the Molecomb Stakes at Goodwood.