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John Thompson (Wolverhampton) Ltd for many years was both the holding company and the principal operating company of the John Thompson group of companies. By 1914 the John Thompson firm had been divided into four departments:
1922 John Thompson (Gas Developments) Ltd, Chemical Engineers. Shared directors and representatives with John Thompson (Wolverhampton), Ltd. Designers and manufacturers of complete plants for the production of hydrogen having a purity of 99.9 per cent., exclusive of air or its components, complete oil-hardening installations and electrolytic hydrogen and oxygen plants.
Late 1940s, with the introduction of John Thompson Ltd as the holding company, the Wolverhampton company became the subsidiary focussed on shell-type boilers and associated heavy equipment.
1950s advert referred to 16 subsidiary companies which included: John Thompson (Wolverhampton) Ltd which designs, manufactures, delivers, erects on prepared foundations and commissions shell boiler plant anywhere in the world. Also superheaters, economizers, pipework. Coal and ash handling plant, chimneys, various types of mechanical stokers for burning various types of fuel, special furnaces for burning wood, combustible by-products or wastes. And pressure vessels, galvanizing baths, annealing covers.
1953 One of the largest makers of shell-type boilers in Europe. As well as making all types of Lancashire, economic, super-economic and vertical-type boilers, also made the heavy pressure parts, drums, etc required for water tube boilers to the specification of John Thompson Water Tube Boilers Ltd. Associated departments and companies made stokers, pulverizing plant, conveyors, boiler-house pipework, etc. Also made heavy pressure vessels for the chemical and oil refining industries, in mild steel and stainless steel. Important rearmament contracts had been undertaken for the Admiralty and other Ministries.