Amberley Group has been quoted on the USM, the Main Market and now on Aim. It started out as a damp proofing business and was effectively a shell when it moved to Aim on 16 January 2004. The transfer price was 7.25p a share. Amberley's only ongoing asset is an investment in smartcard company Fortress (GB). A £1.2m investment in February 2008 took the stake in Fortress to 23.9%.