RELX plc is a corporate group comprising companies that publish scientific, technical and medical material, and legal textbooks; provide decision-making tools; and organise exhibitions. It operates in 40 countries and serves customers in over 180 nations. It was previously known as Reed Elsevier, and came into being in 1992 as a result of the merger of Reed International, a British trade book and magazine publisher, and Elsevier, a Netherlands-based scientific publisher.
The company is publicly listed, with shares traded on the London Stock Exchange, Amsterdam Stock Exchange and New York Stock Exchange. About 55 per cent of the company's revenues are generated from the US, with 23 per cent from Europe and 22 per cent from the rest of the world. The company is one of the constituents of the FTSE 100 Index, Financial Times Global 500 and Euronext 100 Index.