Senior plc Senior plc is an international engineering group that designs, manufactures and markets high-technology components and systems for principal original equipment manufacturers in the aerospace, defence, land vehicle and power and energy markets; its operations span 12 countries with approximately 26 manufacturing sites and approximately 6,800 employees. The company operates through two main divisions: Aerospace, which provides fluid conveyance systems including ducts and hoses, gas turbine components, and structures for commercial and military aircraft; and Flexonics, which supplies emission control products such as exhaust gas recirculation systems, thermal management solutions including flexible hoses and expansion joints, and industrial process control components for automotive, heavy-duty truck and energy applications. Senior plc maintains a global footprint with key facilities in the United Kingdom, United States, Mexico, Czech Republic, South Africa and Malaysia, targeting OEMs in civil aerospace, defence platforms, light and heavy-duty vehicles, and power generation sectors. Founded in 1933 and headquartered at 59/61 High Street, Rickmansworth, Hertfordshire, United Kingdom, the company listed on the London Stock Exchange in 1947 as Senior Economisers Limited. Recent developments include securing two major contracts valued at approximately 200 million euros in May 2025 from leading land vehicle manufacturers for high-technology components in internal combustion engine and hybrid powertrains as well as exhaust gas recirculation coolers compliant with Euro 7 emissions standards, with production ramping up from late 2026 across sites in the Czech Republic, South Africa and Mexico; additionally, in July 2025 Senior plc agreed to sell its loss-making Aerostructures business, which produces airframe and engine components, to private equity firm Sullivan Street Partners for up to 200 million pounds to streamline operations, reduce debt and fund share repurchases while pursuing value-enhancing mergers and acquisitions; these moves follow a strong Q1 2025 trading update with 3% revenue growth, a book-to-bill ratio of 1.34 and 4% Aerospace revenue increase driven by civil aerospace recovery.