| Otre AB | OTSUKA CHEMICAL CO., LTD. ( Osaka-shi , Osaka, JP ) | Otsuka Foods Co., Ltd. ( Osaka, JP ) |
| Otre AB( Solna ) | Otsuka Chemical Company, Limited ( Osaka, JP ) | Otsuka Hirotaka( Chiba ) |
| Otre Ab ( Solna, SE ) | Otsuka Chemical Holdings Co., Ltd.( Osaka ) | Otsuka Kagaku Kabushiki Kaisha |
| Otre AB( Stockholm ) | Otsuka Electric Co., Ltd.( Kanagawa-ken ) | Otsuka Kagaku Kabushiki Kaisha( CA ) |
| Ot''s Engineering Corporation ( Carrollton, TX ) | Otsuka Electric Co., Ltd. ( Kanagawa-ken, JP ) | Otsuka Kagaku Kabushiki Kaisha( Osaka ) |
| Otsubo; Takehiro( Kumamoto ) | Otsuka Electronic Co., Ltd. ( Osaka, JP ) | Otsuka Kagaku Kabushiki Kaisha ( Osaka, JP ) |
| Otsuka America Pharmaceutical, Inc. | Otsuka Electronics | Otsuka Kagaku Kabushiki Kaisha( Osaka-fu ) |
| Otsuka America Pharmaceutical, Inc. ( Rockville, MD ) | OTSUKA ELECTRONICS CO., LTD | Otsuka Kagaku Kabushiki Kaisya( Osaka ) |
| OTSUKA CHEMCIAL CO., LTD. ( Osaka-shi, JP ) | Otsuka Electronics Co., Ltd( Osaka ) | Otsuka Kagaku Kasbushiki Kaisha ( Osaka, JP ) |
| Otsuka Chemical Co., Ltd( Osaka ) | Otsuka Electronics Co., Ltd ( Osaka, JP ) | Otsuka Kanji |
| Otsuka Chemical Co., Ltd. | OTSUKA ELECTRONICS CO., LTD. | OTSUKA Kanji ( Gifu, JP ) |
| OTSUKA CHEMICAL CO., LTD. ( Kawaguchi-shi, Saitama, JP ) | Otsuka Electronics Co., Ltd.( Hirakata ) | Otsuka Kanji( Higashiyamato ) |
| Otsuka Chemical Co., Ltd.( Osaka ) | Otsuka Electronics Co., Ltd. ( Hirakata-shi, JP ) | Otsuka Kanji( Tokyo ) |
| Otsuka Chemical Co., Ltd. ( Osaka, JP ) | Otsuka Electronics Co., Ltd.( Osaka ) | Otsuka Kanji ( Tokyo, JP ) |
| Otsuka Chemical Co., Ltd.( Osaka-shi ) | Otsuka Electronics Co., Ltd. ( Osaka, JP ) | Otsuka Koki Co., Ltd.( Yokohama-shi ) |
| Otsuka Chemical Co., Ltd. ( Osaka-shi, JP ) | Otsuka Foods Co., Ltd. ( all of, JP ) | Otsuka Koki K.K.( Kanagawa-ken ) |
| Otsuka Chemical Co., Ltd. ( Osaka-Shi, Osaka ) | Otsuka Foods Co., Ltd.( Osaka ) | |