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Two decades of innovation Leaders from Yamanouchi and Fujisawa shake hands, marking the 2005 merger that formed Astellas and shaped a patient-first global strategy. In April 2025, Astellas celebrated our 20th Anniversary as a company. Astellas was established in April 2005 through the merger of two companies – Yamanouchi Pharmaceutical (founded in 1923) and Fujisawa Pharmaceutical (founded in 1894). The merger brought together Yamanouchi's strengths in urological medications and chemical synthesis and Fujisawa's excellence in the transplant/immunology area and fermentation technology, forming an ideal complementary partnership. Today, Astellas has more than 13,500 employees around the world. Since our founding, we have reached more than 172 million patients in 103 countries and areas with therapies that have helped to transform their lives. The story of our name The name ‘Astellas’ expresses the idea of ‘aspired stars’ and ‘advanced stars’ and derives from the Latin word ‘stella,’ Greek ‘aster,’ and English ‘stellar,’ which all refer to ‘stars.’ The name is also connected to the Japanese phrase, ‘Make tomorrow shine.’
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