HOYO SEIKO Co.,Ltd.
| Head Office | 873-0223 454-1, Osoe, Akimachi, Kunisaki-shi, Oita-ken |
| Osoe Factory | 873-0223 454-10, Osoe, Akimachi, Kunisaki-shi, Oita-ken |
| number of employees: 98 (2020.3) | |
| Hasama Factory | 879-5521 16-1, Onigase, Hasama-machi, Yuhu-shi, Oita-ken |
| number of employees: 103 (2020.3) | |
| Fukuoka Factory | 838-0824 2194-1, kouno, harazizou, chikuzen-machi, Asakura-gun, Fukuoka-ken |
| number of employees: 98 (2020.3) | |
| Kitakyushu Factory | 822-1211 4735-7, ikata, fukuchi-machi, Tagawa-gun, Fukuoka-ken |
| number of employees: 76 (2020.3) |
Associated Company
| HOYO Met | 879-0614 2736-1, Kunawa, Bungotakada-shi, Oita-ken tel 0978(22)1177 / fax 0978(22)1178 |
| number of employees: 99 (2020.3) | |
| HOYO Shoji | 873-0212 219-1 Shioya Akimachi Kunisaki-shi Oita-ken tel 0978(67)3336 / fax 0978(67)3336 |
| Shinshia | 870-0309 1-9-12 Sakanoichi-Nishi Oita-shi Oita-ken tel 097(586)6331 / fax 097(586)6332 |
| number of employees: 212 (2020.3) | |
| Koyo Green Foods | 873-0224 3434-65Yamaguchi Aki-machi Kunisaki-shi Oita-ken |
| HOYO SEIKO(HUBEI) | 441004 No.17 TIANLAI ROAD. GAO XIN QU. XIANG YANG CITY. HUBEI PROVINCE. CHINA tel 0710-3211139 / fax 0710-3211736 |
| number of employees: 101 (2019.12) |
