Mount Engineering was set up as a shell to take over CISX-quoted engineering company Mount (York) Ltd in a deal worth £10.85m. Shareholders were offered 70p cash per share or one new Mount Engineering share. Mount Engineering raised £12.5m at 70p a share at the same time. It joined Aim on 6 July 2007. Mount (York) joined the CISX in December 2005 following the acquisition of Redapt, which makes thread converting adaptors and reducers for explosive and hazardous environments such as oil refineries, and Hi-Flow, a distributor of valves and actuators for the oil and petrochemical industries. It subsequently bought Raxton, which is in a similar business to Redapt.