The sister companies of Siemens are best understood as the companies that are part of the broader Siemens ecosystem through ownership, spin-offs, and significant shareholdings, rather than traditional sister companies under one parent. Siemens AG in Munich is the parent, and its most important sister or affiliated companies include Siemens Healthineers, which is a separately listed medical technology company that makes MRI and CT scanners and is majority owned by Siemens AG with about 75 percent ownership, Siemens Energy, which was spun off in 2020 and makes gas turbines, grid technology, and wind turbines through Siemens Gamesa and is about 25 percent owned by Siemens AG, and Siemens Mobility, which is not separate but is a core division that makes trains and rail infrastructure. Other closely related companies include Siemens Financial Services, which provides financing for Siemens projects, and various software companies Siemens has acquired that operate under Siemens Digital Industries Software, such as Mentor Graphics now Siemens EDA and Mendix. Historically, Siemens also created Osram for lighting and Infineon for semiconductors, which are now independent but were once sister companies. In 2026, the Siemens family of companies is best described as Siemens AG plus its major stakes in Healthineers and Energy, which together form a broader industrial network.
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