Nikkei Press estimated the market share of credit card firms in Japan in 2015. According to it, Mitsubishi UFJ NICOS has the biggest share (12.3%). The industry-wide total billings were 43 trillion yen in 2015.
Figure: 2015 Market Share of Credit Card Firms in Japan
| Firm | Market Share % |
| Mitsubishi UFJ NICOS | 12.3 |
| Sumitomo Mitsui Card | 11.7 |
| Rakuten Card | 10.0 |
| Credit Saison | 9.9 |
| AEON Financial | 9.3 |
| Others | 46.8 |
Source is Nikkei Sangyo Shimbun newspaper, the article on 2016 July 25th.
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