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Johnson Matthey Plc is a British specialty chemicals and sustainable technologies company focused on clean air, catalyst, hydrogen, and platinum group metals services. Johnson Matthey develops automotive catalysts and emission-control solutions for light- and heavy-duty vehicles, while its Catalyst Technologies business supports lower-carbon chemical and fuel value chains. The company also provides platinum group metals recycling, refining, and materials management services, helping customers secure and reuse critical metals across industrial applications. Its Hydrogen Technologies segment supplies catalyst-coated membranes and related components used in fuel cells and electrolyzers. Johnson Matthey serves energy, chemicals, automotive, and industrial customers across Europe, North America, and Asia, positioning the company as a key supplier of advanced materials and process technologies in the global sustainability market.