Nikkei press reported 2015 carbide tool market share in Japan. According to it, the top supplier was Panasonic (11%).
Figure: 2015 Carbide Tool Market Share in Japan
|Manufacturer||Market share (%)|
|Sumitomo Electric Industries||16.6|
Source is Nikkei Sangyo Shimbun newspaper, the article on 2016 July 25th.