As of the start of 2020
Tadashi Yanai
Masayoshi Son
Takemitsu Takizaki
Nobutada Saji
Hiroshi Mikitani
Yasumitsu Shigeta
Takahisa Takahara
Akira Mori
Shigenobu Nagamori
Hideyuki Busujima
Source: https://www.forbes.com/japan-billionaires/list/#tab:overall
Tadashi Yanai - Uniqlo
Fast Fashion Brand - 2nd largest in the World
Affordable clothes with decent quality. Mainly simple designs. Focuses on technology and sustainability
Sales down 2% YOY in Japan but growing by double digits in Asia and Australia.
2. Masayoshi Son - Softbank
Telecommunications, Financial Services
Popular advertisements / First carrier to offer the Iphone
Major investor in companies - Alibaba (29.5%), Wework (80%), Sprint mobile (85%), Oyo hotels (42%)
4. Nobutada Saji and Family - Suntory
Beverage and food maker
Popular products: Whiskey, Beer, Jim Beam, Ribena, Boss Coffee
5. Hiroshi Mikitani - Rakuten
online retailer / financial services
creates loyalty by offering points / membership program
businesses manage inventory/customer service/logistics by themselves
7. Takahisa Takahara - Unicharm
baby / hygiene / cleaning products
strong sales across Asia
Has just entered the pet goods market
8. Akira Mori - Mori Trust
Real Estate company that owns lots of office builidngs and hotels in prime locations
Conrad, Shangri-La, Marriot Hotels
10. Hideyuki Busujima - Sankyo
One of the big 3 Pachinko makers in Japan
One of the few forms of gambling allowed in Japan