三共第一

Daiichi Sankyo Company Limited (第一三共株式会社, Daiichi Sankyō Kabushiki-gaisha?) (TYO: 4568) is a joint holding company established in 2005 by Sankyo Co., Ltd. (三共株式会社, Sankyō Kabushiki-gaisha?) and Daiichi Pharmaceutical Co., Ltd. (第一製薬株式会社, Daiichi Seiyaku Kabushiki-gaisha?), which are pharmaceutical companies based in Japan. Its main offices are located in Chūō-ku, Tokyo.