SDI Group is a systems integrator for materials handling systems for distribution centres. Products include box sorting systems and hanging garment systems. It has an international business which is particularly strong in the US and Europe. SDI came into existence when US business SDI Industries Inc and UK associate SDIGreenstone merged to form SDI Group prior to the Aim flotation SDI joined Aim on 2 July 2007 via a placing at 49p a share. SDI raised £3m, although £2.3m of that was eaten up costs, while £26.3m was raised by existing shareholders.