Senior plc (Senior) designs, manufactures, and markets high technology components and systems. The company provides high technology products and systems for demanding applications in aerospace, defense, land vehicle, power, energy, and adjacent markets. Its product portfolio includes fluid conveyance and thermal management components and sub-systems, as well as complex structural and precision-machined parts. The company also provides a wide range of products including high-pressure and low-pressure ducting systems, control bellows, sensors, assemblies, thermal insulations, hydraulic fittings, couplings, flanges, clamps, engine build-up ducting, control products, and interiors passenger service units. Senior serves industries such as aerospace, defense, land vehicle propulsion, petrochemical, and renewable energy.

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Senior's R&D arm focuses on designing and engineering products tailored to individual customer specifications and investigating specific manufacturing processes. The company's R&D team focuses on sustainability by developing technologies that support customers in reducing energy consumption and carbon emissions. R&D plans to develop new thermal management technology, such as components for fuel cells, advanced heat exchanger solutions, and laser welding for battery cooling plates. The company continues to invest in R&D to provide long-term solutions for its customers. In FY2025, the company incurred an R&D expenditure of GBP15.7 million, which as a percentage of revenue stood at 2.1%.