Nikkei press reported 2015 prescription-only drug market share in Japan. According to it, the top supplier was Takeda (7%).
Figure: 2015 Medicine Market Share in Japan
| Manufacturer | Market share (%) |
| Takeda | 6.4 |
| Astellas | 6.1 |
| Daiichi Sankyo | 5.8 |
| Chugai | 4.4 |
| Pfizer | 4.4 |
| Others | 72.9 |
Source is Nikkei Sangyo Shimbun newspaper, the article on 2016 July 25th.
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