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Siemens AG is a German multinational engineering and electronics conglomerate company headquartered in Berlin and Munich. It is Europe's largest engineering company and maker of medical diagnostics equipment and its medical health-care division, which generates about 12 percent of the company's total sales, is its second-most profitable unit behind the industrial automation division.

Siemens' principal activities are in the fields of industry, energy, transportation and healthcare. It is organized into four main divisions: Industry, Energy, Healthcare, and Infrastructure & Cities. Siemens and its subsidiaries employ around 360,000 people across nearly 190 countries and reported global revenue of approximately ?78.3 billion in 2012. The company has been the subject of a number of controversies in its history.