Diploma PLC is a group of specialist businesses that provide critical products and value-added services to customers across a wide range of markets – where quality, reliability and expertise matter most. We help our customers run smarter, safer and stronger. We provide the bolts that hold planes and race cars together, design the seals that make wind turbines work and help surgeons find the best solutions to save lives.
Advanced technologies for critical applications in aerospace, energy, infrastructure, medical and rail. Our Controls businesses provide wires and cables, connectors and automation parts for use in high-tech industries and equipment, from aircraft and F1 cars to data centres and medical devices.
Reliable, high-performance sealing solutions that protect equipment, power innovation and drive uptime across industries. Our Seals businesses provide gaskets, hydraulic hoses and fittings for maintaining heavy machinery and vehicles, from tractors to wind turbines.
Smart solutions that advance diagnostics, drive better patient outcomes and improve lives. Our Life Sciences businesses provide medical instruments, diagnostics equipment and lab products for use by doctors and scientists.
We deliver more than just products. Value-add is at the heart of our customer relationships. From bespoke solutions and exceptional customer service, to technical support and supply chain management, our businesses deliver value-add solutions that make customers' lives easier.
Here are some of the ways Diploma businesses add value for customers
Download our latest Annual Report for the year ended 30 September 2025
Hear from our CEO Johnny Thomson
Today we announced a strong set of full year results for Diploma PLC which reflect the strength of our diverse businesses and the dedication of our teams across all of our markets.
Diploma's Half Year Results 2025 - CEO's message
20 May 2025 - Our Group CEO, Johnny Thomson, shares the key messages from our Half Year Results.
Diploma has a strong track record of delivering sustainable, compounding financial performance. We believe that this comes from a balance of ambition with discipline.
Building high-quality, scalable businesses for sustainable organic growth
We are committed to tackling climate change, empowering our people and creating a positive impact on society and the environment.
Our colleagues are the foundation of our success. Each of our businesses has its own unique culture and values. However, our Group values reflect the shared beliefs and behaviours of the Diploma Group.