Nikkei Press estimated the market share of ad agencies in Japan in 2015. According to it, Dentsu has the biggest share (25.3%). The industry-wide sales in 2015 were 6 million yen.
Figure: 2015 Ad Agency Market Share in Japan
| Agency | Market share (%) |
| Dentsu | 25.3 |
| Hakuhodo | 10.8 |
| Asatsu-DK | 5.0 |
| Daiko | 1.9 |
| East Japan Marketing & Communications | 1.7 |
| Others | 55.3 |
Source is Nikkei Sangyo Shimbun newspaper, the article on 2016 July 25th.
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