グループ企業
| Company Name | Tohoku Rinkai Kogyo Co., Ltd. |
| Representative | President Takayuki Sawafuji |
| Head Office | 3-6-13 Numadate, Hachinohe, Aomori Pref.031-0071 |
| Business | Building construction & Factory field works |
| Company Name | Higashi Nihon Tug Boat Co., Ltd. |
| Representative | President Takayuki Sawafuji |
| Head Office | 3-11, Toyosu, Hachinohe, Aomori Pref.039-1162 |
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| Business | Tug boat oparation |
| Company Name | Hachinohe Rinko Warehouse Co., Ltd. |
| Representative | President Takayuki Sawafuji |
| Head Office | 36-12 Kaigan, Kawaragi, Hachinohe, Aomori Pref.039-1161 |
| Business | Warehousing |
| Company Name | Rintora Co., Ltd. |
| President | President Takayuki Sawafuji |
| Head Office | 3-18 Toyosu, Hachinohe, Aomori Pref.039-1162 |
| Business | Truck hauling |
| Company Name | Hachinohe Rinko Services Co., Ltd. |
| Representative | President Kenichi Settai |
| Head Office | 29 Kaigan, Kawaragi, Hachinohe, Aomori Pref.039-1161 Phone:81-178-28-5615 Fax:81-178-20-4966 E-MAIL:rinkosv@hi-net.ne.jp |
| Business | Janitorial works and other services for ferry boats |
| Company Name | Mutsu-ogawara Marine Services Co., Ltd. |
| Representative | President Akihiro Tanaka |
| Head Office | 133-66 Hacchazawa, Takahoko, Rokkasho, Kamikita, Aomori |
| Business | Tanker mooring/unmooring operations |
| Company Name | Kitanihon Port Services Co., Ltd. |
| Representative | President Yasuo Sakanakura |
| Head Office | 16-4 Kaigan, Kawaragi, Hachinohe, Aomori-Pref. 031-8608 JAPAN |
| Business | Stevedoring in the port of Mutsu-ogawara |
| Company Name | Maruhachi Shoji Co., Ltd. |
| Representative | President Kenichi Settai |
| Head Office | 1-1-62,Chikukougai, Hachinohe, Aomori Pref.031-0831 |
| Business | Sales of oil and office supplies etc. |
| Company Name | Hachinohe Kowan Kanren Kigyo Kanri Co., Ltd. |
| Representative | President Takayuki Sawafuji |
| Head Office | 16-4 Kaigan, Kawaragi, Hachinohe, Aomori Pref.031-8608 |
| Business | Computer business |
| Company Name | Hakko Auto Co., Ltd. |
| Representative | President Kenichi Settai |
| Head Office | 3-7-20 Numadate, Hachinohe, Aomori Pref.031-0071 |
| Business | Automobile maintenance and inspection |
| Company Name | Maruhachi Kensetsu Kogyo Co., Ltd. |
| Representative | President Yasuya Kudou |
| Head Office | 16-4 Kaigan, Kawaragi, Hachinohe, Aomori Pref.039-1161 |
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| Business | Building construction & canalization work & paving work & civil work |
| Company Name | Marutake Distribution Co., Ltd. |
| Representative | President Takayuki Sawafuji |
| Head Office | 3-20, Toyosu, Hachinohe, Aomori Pref.039-1162 |
| Business | Truck hauling |
| Company Name | Rinkai Unyu Co., Ltd. |
| Representative | President Yasuo Sakanakura |
| Head Office | 3-6-13 Numadate, Hachinohe, Aomori Pref.031-0071 |
| Business | Truck hauling |