Nikkei press reported 2015 synthetic rubber market share in Japan. According to it, the top supplier was JSR (28%).
Figure: 2015 Synthetic Rubber Market Share in Japan

| Manufacturer | Market share (%) |
| JSR | 28.4 |
| Zeon | 18.2 |
| Asahi Kasei | 16.1 |
| Ube Industries | 7.9 |
| Sumitomo Chemical | 5.8 |
| Others | 23.6 |
Source is Nikkei Sangyo Shimbun newspaper, the article on 2016 July 25th.
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