A glassware forming machine comprises a carriage, a blank station at which parisons are formed in upwardly open parison moulds from gobs of molten glass, and a further station, the carriage being reciprocable in a straight line between the blank station and the further station in order to transfer parisons from the blank station to the further station. The carriage has a neck ring mould comprising neck ring parts and a guide ring which defines the sealing surface of the finish of each parison. The guide ring is biased upwardly by spring-loaded members which raise the guide ring when the carriage is at the further station in order that the guide ring should clear the released parisons on return movement of the carriage to the blank station.