Nikkei published their 2018 interchangeable lens camera market share report:
All other companies combined have less than a 13% market share (the top 3 camera manufacturers gained 6.2% in 2018 to a total of 87.3%). While Canon and Sony gained market share (3.9% and 2.9%), Nikon lost 0.6%.
The compact (fixed lens) digital camera market share is similar:
Related – Canon is #1 in the mirrorless market in Japan for 2018
BCN Ranking Japan: Canon is #1 in the mirrorless market for 2018
Also – the top 11 spots taken by Nikon and Canon in June’s BCN ranking camera sales report:
June’s BCN ranking camera sales report: the top 11 spots taken by Nikon and Canon
Source: Nikkei