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On July 1, 1949 the forerunner of the present company, Kyowa Hakko Kogyo Co., Ltd. is established. Following the merger with Kirin Pharma Co., Ltd., on October 1, 2008 the company changed its name to its present.
On July 11, 2014, the KHK subsidiary, ProStrakan Group , acquired Archimedes Pharma from the Novo Nordisk Foundation for $394 million In 2019, the entity was renamed "Kyowa Kirin Co., Ltd.", replacing its prior name of Kyowa Hakko Kirin Co., Ltd.
In November 2022, Kyowa Kirin announced plans to spin its international established medicines portfolio into a new joint venture with German company Grünenthal.