Nikkei press reported 2015 cement market share in Japan. According to it, the top supplier was Taiheiyo Cement (47%).
Figure: 2015 Cement Market Share in Japan
| Manufacturer | Market share (%) |
| Taiheiyo Cement | 34.9 |
| Ube-Mitsubishi Cement | 24.6 |
| Sumitomo Osaka Cement | 19.6 |
| Tokuyama | 7.0 |
| Aso Cement | 4.6 |
| Others | 9.3 |
Source is Nikkei Sangyo Shimbun newspaper, the article on 2016 July 25th.
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