Nikkei press reported 2015 hydraulic shovel market share in Japan. According to it, the top supplier was Komatsu (24%).
Figure: 2015 Hydraulic Shovel Market Share in Japan
|Manufacturer||Market share (%)|
|Hitachi Construction Machinery||20.8|
|Kobelco Construction Machinery||19.9|
|Sumitomo Construction Machinery||11.9|
Source is Nikkei Sangyo Shimbun newspaper, the article on 2016 July 25th.