The company has its origins in a firm of toolmakers, W. Tyzack Sons & Turner, which was established in Sheffield, in around 1867.

[3] After the Sheffield works had been sold to a rival in 1987, the listed company, which was by then known as Tyzack Turner Group plc, was acquired by new management and was renamed TT Group plc in 1988.

[8] The company bought New Chapel Electronics, a manufacturer of interconnection systems for the aerospace industry, in 2008[9] and the Power and Control business of Ferranti Technologies, a manufacturer of mission-critical power and control sub-assemblies, in 2022.

[10] The company engineers and manufactures sensors, power modules, resistors, magnetics, semiconductors, connectors and optoelectronics for the industrial, aerospace and defence, medical and transportation markets.

[11] Product brands are AB Connectors, Aero Stanrew, BI Technologies, Cletronics, IRC, Optek Technology, Roxspur Measurement and Control, Semelab and Welwyn Components.