Sigma is headquartered in Hinckley in Leicestershire and has four UK based facilities and two facilities in China – Xi'an and Chengdu. Sigma recently acquired the rigid pipe operations of Rolls Royce, which formed part of the sales process and ultimate sale to Silverfleet Capital. The transaction is conditional on competition clearance and Avingtrans plc shareholder approval and is expected to close shortly.

Silverfeet Capital is a leading, independent, European private equity firm specialising in mid-market buyouts with an investment team based in London, Munich and Paris.

Avingtrans plc, the parent company of Sigma, is an AIM listed engineering company focussing on highly engineered components, systems and services to the aerospace, energy, medical and traffic management industries worldwide.

Steen Associates acted as exclusive financial adviser to the board of Avingtrans plc.