Atlas Copco (Copco from Compagnie Pneumatique Commerciale) is a Swedish industrial company that was founded in 1873. It manufactures industrial tools and equipment. The Atlas Copco Group is a global industrial group of companies headquartered in Nacka, Sweden. In 2017, global revenues totaled SEK 86 billion, and by the end of that year the company employed about 34,000 people. The company manufactures products at about 100 production sites in more than 20 countries.[citation needed] As of 2016, the United States is the company's largest single market, followed by China.The firm's shares are listed on the OMX Stockholm exchange and both 'A' and 'B' classes form part of the benchmark OMXS30 index. Atlas Copco companies develop, manufacture, service, and rent industrial tools, air compressors (of which it is the world's leading producer), construction and assembly systems. The Group operates in four areas: Compressor Technique, Vacuum Technique, Construction Technique and Industrial Technique.