Siemens AG
Industrial Conglomerate / TechnologyFounded 1847- Updated July 2025
Reviewed by Swet Parvadiya
Last reviewed: July 2025
CorpDigest
Siemens AG
Company History
Founded 1847 in Munich, Germany
Last reviewed: 2025-07-15 · By Swet Parvadiya
The first Siemens & Halske contract was a telegraph line from Berlin to Frankfurt — 500 kilometers of copper wire strung across Prussian farmland in 1848, the first long-distance electrical communications infrastructure on the European continent. Werner von Siemens didn't just win the contract; he redesigned the needle telegraph itself to make it reliable enough to run that distance without signal degradation. The technology came first. The business followed the technology.
Werner von Siemens was a Prussian military officer with a physics obsession and a patent for a dial telegraph he'd built while serving time in military prison for acting as a second in a duel. He partnered with Johann Georg Halske, a precision instrument maker, in a converted apartment workshop in Berlin's Schöneberger Strasse. Their combined capital was 6,842 thalers. Within three years they had contracts to wire Russia.
The 1866 discovery of the self-exciting dynamo changed the company's trajectory permanently. Werner demonstrated that an electromagnetic generator could sustain itself without an external magnetic source — a principle that made large-scale electrical power generation economically viable. Siemens & Halske went from building telegraph systems to building the infrastructure that would electrify cities. The company laid the first transatlantic telegraph cable, built the first electric tram in the world in Berlin in 1879, and supplied the electrical systems for some of the earliest American utilities in the 1880s.
By the time the company reorganized as Siemens AG through the 1966 merger of Siemens & Halske and Siemens-Schuckertwerke, it had already survived two world wars, the hyperinflation of the 1920s, and the Allied dismantling of German industrial capacity after 1945. Rebuilding from the rubble of Munich — the company relocated its headquarters there from Berlin during the war — proved that the institutional knowledge embedded in the workforce was more durable than the physical assets that had been destroyed.
Werner von Siemens (1816-1892) was a German inventor, engineer, and entrepreneur whose scientific contributions and business acumen placed him among the most consequential figures of the Industrial Revolution. His 1866 discovery of the self-exciting dynamo principle — demonstrating that an electrical generator could create its own magnetic field — is considered one of the foundational insights of electrical engineering, enabling the practical generation of large-scale electrical power for the first time. As co-founder and driving force of Siemens & Halske, he built the company from a Berlin workshop employing a handful of craftsmen into a global enterprise operating on four continents with thousands of employees. He was elected to the Prussian Academy of Sciences in 1873 and was ennobled by Kaiser Wilhelm I in 1888, adding the aristocratic 'von' to his surname. He published an autobiography in 1892, the year of his death, which remains one of the most candid and analytically precise accounts of entrepreneurship and technical development in the nineteenth century. His model of integrating original scientific research with commercial engineering application directly anticipated the R&D-driven industrial model that characterizes Siemens AG today.
Johann Georg Halske (1814-1890) was the co-founder of Siemens & Halske and the manufacturing backbone of the company's early success. While Werner von Siemens provided the scientific vision and entrepreneurial drive, Halske brought the precision craftsmanship and practical manufacturing discipline that transformed Werner's electrical inventions into reliable, commercially deployable products. His workshop capabilities were essential to the company's ability to fulfill its early contracts for the Prussian telegraph network, where the reliability of individual components — many hand-made to tolerances that strained early industrial manufacturing — was critical to system performance. Halske grew increasingly uncomfortable with the company's rapid expansion into speculative electrical ventures as the business grew in the 1860s, and he retired from the partnership in 1867, selling his stake back to Werner and his brothers. Though he played no further role in the company's development after his departure, his contribution to establishing Siemens' reputation for manufacturing quality in its formative years was foundational. He lived out his retirement in Berlin until his death in 1890, witnessing the company he had helped build transform into one of the great enterprises of the electrical age.
Werner von Siemens and Johann Georg Halske establish Telegraphen-Bauanstalt von Siemens & Halske in Berlin with initial capital of 6,842 Prussian thalers, employing three people in a converted apartment workshop. The company immediately receives its first significant contract from the Prussian government to construct a telegraph line from Berlin to Frankfurt.
Werner von Siemens announces the self-exciting dynamo principle to the Berlin Academy of Sciences — a discovery that makes practical large-scale electricity generation economically viable for the first time and positions Siemens & Halske to lead the coming electrification revolution. This single scientific contribution is arguably the most consequential in the company's history.
Siemens demonstrates the world's first electric railway at the Berlin Industrial Exhibition, running a 300-meter track powered by a central electrical station. The demonstration attracts enormous public attention and establishes Siemens as the world leader in electric traction technology, a position it retains 145 years later.
The company converts from a partnership to a joint-stock corporation — Siemens & Halske Aktiengesellschaft — enabling broader capital raising and professional management structures as the founding generation ages. This reorganization sets the template for Siemens' twentieth-century corporate structure.
The merger of Siemens & Halske, Siemens-Schuckertwerke, and Siemens-Reiniger-Werke creates the modern Siemens AG, consolidating the company's electrical engineering, power, and medical technology businesses into a unified corporate structure with approximately 300,000 employees and revenues comparable to the largest American industrial corporations.
Siemens acquires the power engineering operations of Allis-Chalmers, establishing a significant U.S. Manufacturing base for large power generation equipment and initiating the company's transformation into a major American industrial employer. This acquisition accelerates Siemens' penetration of the American utility and industrial markets.
Siemens acquires UGS Corp., a leading product lifecycle management software company, for 3.5 billion dollars — the largest acquisition in the company's history at that time and the foundational transaction of its industrial software portfolio strategy. UGS's Teamcenter, NX, and Tecnomatix platforms become the nucleus of what will eventually become the Xcelerator software portfolio.
Siemens lists Siemens Healthineers on the Frankfurt Stock Exchange in the largest German IPO since Deutsche Telekom in 1996, raising approximately 4.2 billion euros at a company valuation near 28 billion euros. The IPO establishes Healthineers as an independently capitalized medical technology company while Siemens AG retains a majority stake, enabling differentiated strategic and financing strategies.
Siemens completes the spinoff of its gas and power generation businesses as Siemens Energy AG, which is separately listed on the Frankfurt Stock Exchange in September 2020. Siemens AG retains approximately 35% of Siemens Energy at spinoff, subsequently reducing to approximately 26% through secondary offerings. The transaction simplifies Siemens AG's portfolio and focuses the company on automation, digitalization, and smart infrastructure.
Roland Busch succeeds Joe Kaeser as CEO and introduces the DEGREE strategic framework, accelerating Siemens' positioning as a technology company with core competencies in automation and digitalization. Busch launches the process to reorganize Siemens' software portfolio under the unified Xcelerator brand and explicitly commits to growing software and digital revenue to 10 billion euros by 2027.
Siemens launches Xcelerator as a unified cloud-based open digital business platform at its inaugural Xcelerator conference, consolidating the company's industrial software, IoT, and marketplace ecosystem under a single commercial and technical architecture. The platform is designed to provide an open ecosystem for third-party developers, directly challenging Dassault Systèmes' 3DEXPERIENCE platform and PTC's Industrial Internet of Things offerings.
Siemens' Smart Infrastructure segment delivers record EBITA margins near 15.5% in FY2024, driven by surging demand for electrical grid modernization infrastructure tied to data center construction and the energy transition. The segment generates approximately 20.9 billion dollars in revenue, validating management's thesis that electrification megatrends provide a multi-year structural growth tailwind.
Siemens acquired UGS Corp. — a leading product lifecycle management and industrial software company — for 3.5 billion dollars to create the nucleus of what would become the world's most comprehensive industrial software portfolio. UGS brought Teamcenter (PLM), NX (CAD/CAM), Tecnomatix (manufacturing simulation), and Solid Edge (mid-market CAD) to Siemens, capabilities the company lacked entirely before the acquisition. The purchase reflected CEO Klaus Kleinfeld's recognition that factory automation value was shifting from hardware control systems toward software-defined product development and manufacturing optimization.
Siemens acquired Mentor Graphics — the world's leading electronic design automation (EDA) software company — for 4.5 billion dollars to extend its industrial software portfolio into the electronic systems design domain, addressing the growing importance of electronics content in manufactured products. Mentor's suite included tools for printed circuit board design, integrated circuit verification, embedded software development, and thermal management simulation that had no parallel in Siemens' existing UGS-derived portfolio. The acquisition reflected the reality that in automobiles, aircraft, and industrial machinery, software-defined electronics now constitute the primary source of product differentiation and development risk.
Siemens acquired Supplyframe, a digital marketplace and data analytics platform for the global electronics components supply chain, for approximately 700 million dollars to add supply chain intelligence capabilities to its industrial software portfolio. Supplyframe's platform provided real-time visibility into component availability, pricing, and supply risk across the global electronics supply chain — a capability that became extraordinarily valuable during the semiconductor shortage crisis of 2020-2022. The acquisition extended Siemens' software footprint upstream into product sourcing and component engineering workflows.
Siemens acquired Brightly Software — a leading cloud-based asset management and operations software provider for educational institutions, government facilities, healthcare organizations, and sports venues — for approximately 1.575 billion dollars to strengthen its Smart Infrastructure segment's software and digital services capabilities. Brightly's asset management platform serves over 12,000 customers managing facilities operations, work order management, and infrastructure asset lifecycle for tens of thousands of buildings across North America and Australia. The acquisition aligned with Siemens' strategy of building recurring software revenue streams on top of its physical infrastructure installed base.
Siemens divested its Yunex Traffic intelligent transportation systems business (traffic management systems, smart city infrastructure) to Atlantia SpA for approximately 950 million dollars as part of its portfolio simplification strategy focused on core automation and digital industries businesses. This transaction, while a divestiture rather than acquisition, represents a defining strategic pivot that illustrates how Siemens has used asset sales as actively as acquisitions to sharpen its portfolio focus. The decision to exit the traffic systems business — despite its profitable operations — reflected CEO Roland Busch's conviction that Siemens' strategic energy and capital should be concentrated in industrial automation software and smart electrical infrastructure where the company has the most defensible competitive positions.
Siemens was founded on October 12, 1847 in a Berlin courtyard workshop under the name Telegraphen-Bauanstalt von Siemens & Halske. Werner von Siemens, a Prussian artillery officer with engineering training, had patented an improved pointer telegraph that used a needle to indicate letters instead of Morse code. Together with the precision mechanic Johann Georg Halske, he set up a ten-person workshop on Schöneberger Strasse with seed capital of 6,842 thaler from a cousin, Johann Georg Siemens. The first major contract came in 1848 to build a telegraph line between Berlin and Frankfurt am Main, the longest in Europe at the time, which carried news of the German National Assembly. Within two decades the firm had built the Indo-European Telegraph Line connecting London to Calcutta, completed in 1870, and laid transatlantic cables. The 1866 invention of the dynamo-electric principle by Werner von Siemens unlocked industrial-scale electricity generation and pushed the company beyond telegraphy into power engineering. By 1897 the firm had been renamed Siemens & Halske AG and was a stock corporation. The Berlin workshop origin remains the symbolic foundation for what became one of the world's largest industrial conglomerates.
Siemens internationalized almost from inception. Werner's brother Wilhelm Siemens (later Sir William Siemens) opened a London office in 1850 that became Siemens Brothers, and another brother Carl established a Saint Petersburg branch in 1853 that won major telegraph contracts from the Russian government. The Indo-European Telegraph Line, completed in 1870, linked London to Calcutta and demonstrated the firm's ability to manage transnational engineering projects. By the early 20th century Siemens had operations across Europe, the Russian Empire, China, Japan, and South America, with subsidiaries handling local sales and manufacturing. The two world wars devastated the company. Most foreign assets were expropriated, the Berlin headquarters was destroyed, and the workforce dropped from 244,000 in 1944 to 47,000 by the end of 1945. Postwar reconstruction relocated headquarters to Munich, with significant operations remaining in Erlangen. The 1966 merger of Siemens & Halske, Siemens-Schuckertwerke, and Siemens-Reiniger-Werke created the modern Siemens AG. International expansion resumed aggressively from the 1970s, with the company now operating in more than 190 countries and employing approximately 312,000 people as of fiscal 2024.
Siemens's role during the Third Reich is one of the darkest chapters in its history. As Germany rearmed in the 1930s, Siemens & Halske and Siemens-Schuckertwerke became major suppliers to the Wehrmacht and the Luftwaffe, manufacturing communications equipment, switchgear, and components for armaments. During the war the company used tens of thousands of forced laborers, including concentration camp prisoners from Auschwitz, Ravensbrück, and Buchenwald, in plants in Berlin, Nuremberg, and elsewhere. Estimates from later historical research place the number of forced and slave laborers at Siemens facilities at roughly 80,000 to 100,000. After the war the company was Allied-targeted for dismantling but retained much of its core German operations and quickly resumed civilian production. In 1998 Siemens paid 12 million Deutsche marks into a fund for surviving forced laborers, and in 2000 it joined the Foundation Initiative of German Industry that contributed 5 billion Deutsche marks to a Remembrance, Responsibility and Future Fund. Siemens has commissioned and published independent historical research on this period and acknowledges these events as central to the company's modern compliance and ethics commitments.
Vision 2020, announced in May 2014 by then-CEO Joe Kaeser, was the most consequential portfolio overhaul in modern Siemens history. The strategy organized the company around the electrification, automation, and digitalization value chains, and committed to divesting or carving out businesses that did not fit those themes. Major moves included the 2015 sale of the hearing aid business to private equity for €2.15 billion, the 2017 merger of the wind power business with Spanish company Gamesa to form Siemens Gamesa, the 2017 IPO of Healthineers, the 2018 sale of the airport logistics and postal automation business, and the 2020 spin-off of Siemens Energy, which carved out the oil and gas, power generation, and grid businesses into a separately listed company with Siemens AG retaining a 35.1 percent stake initially. The strategy was succeeded by Vision 2020+ in 2018 and refined by Roland Busch after he became CEO in 2021. The result is that Siemens AG today is structured around four core operating units: Digital Industries, Smart Infrastructure, Mobility, and a separately listed but majority-owned Siemens Healthineers, with the Siemens Energy stake reduced to about 17 percent and treated as a financial holding.
Roland Busch took over as CEO of Siemens AG on February 3, 2021, succeeding Joe Kaeser. Under Busch the company has accelerated the shift toward software, digital industries, and grid infrastructure. The most consequential moves include the August 2024 announcement of the $10.6 billion all-cash acquisition of Altair Engineering, a US simulation and high-performance computing software vendor, the largest software deal in Siemens history and a centerpiece of the Industrial AI strategy. Earlier acquisitions included Brightly Software for $1.575 billion in December 2022 and the merger of Mentor Graphics (acquired in 2017 for $4.5 billion under Kaeser) into the Siemens EDA business. Busch has also overseen the partial deconsolidation of Siemens Healthineers as a strategic priority, the sale of large parts of the Innomotics motor business to KPS Capital Partners for €3.5 billion in 2024, and the planned partial divestiture of Siemens Logistics. The Mobility business has expanded through major orders including the German ICE high-speed rail contract worth approximately €8 billion. Vision 2020+ has become the more granular operational program, and Busch has continued the trajectory of converting Siemens into a higher-margin, software-and-automation-focused industrial company rather than a sprawling electrical conglomerate.