Finding forgotten or old paper shares requires a systematic search through personal documents, safety deposit boxes, or contacting deceased relatives' estates if the shares belonged to family members. If you suspect you own electronic shares or old certificates, you can utilize asset reunification services, check the UK government's Unclaimed Assets Register, or contact the company's official registrar—such as Computershare, Equiniti, or Link Group—by providing full historical names, previous residential addresses, and corporate identifiers to trace missing holdings.