Nikkei Press estimated the market share of leasing companies in Japan in 2015. According to it, Sumitomo Mitsui Finance and Leasing has the biggest share (13.8%). The industry-wide total sales were 5 trillion yen in 2015.
Figure: 2015 Market Share of Leasing Companies in Japan
|Company||Market share (%)|
|Sumitomo Mitsui Finance and Leasing||13.8|
|Century Tokyo Leasing||12.7|
|Mitsubishi UFJ Lease & Finance||11.8|
Source is Nikkei Sangyo Shimbun newspaper, the article on 2016 July 25th.