| OOCL (Infotech) Holdings Limited ( Tortola, GB ) | Oonagi LLC ( Grantsville, UT ) | Oorja Protonics ( Fremont, CA ) |
| Ooggieya Ltd. ( Wilmington, DE ) | OOnagi, LLC | Oorja Protonics ( Menlo Park, CA ) |
| Oogi Chemical Industry Co., Ltd. ( Osaka, JP ) | OOnagi, LLC ( Greenville, TX ) | OORJA PROTONICS, INC. ( Fremont, CA ) |
| Ooh La La!, Inc. ( Monterey Park, CA ) | Oonuma Mitsuru( Tokyo ) | Oosaka Yuuki Kagaku Kogyo Kabushiki Kaisha ( Oosaka, JP ) |
| Oohashi; Tsutomu | OOO " NAUCHNO-EXPERIMENTALNOE PROIZVODSTVO MIKROKHIRURGIYA GLAZA " | Oosaki Corporation( Tokyo ) |
| Oohiro Seisakusho Co., Ltd. | ooo "ANDANTE" ( St. Petersburg, RU ) | Oosterhof Franciscus Leonardus |
| Oohiro Works Co., Ltd.( Osaka ) | OOO "Dependable Electronic Converter Systems", RU( Moscow ) | Oosterhuis Ralph T.( Richmond Hill ) |
| Oohiro Works Ltd. | OOO "Gelios" ( Omsk, RU ) | Oosterkamp Oosterbeek Octrooien |
| Oohiro Works Ltd.( Osaka ) | OOO "MBF" ( Obninsk, RU ) | Oosterkamp Oosterbeek Octrooien( Oosterbeek ) |
| Oohiro Works, Ltd | OOO "NOVYE ENERGETICHESKIE TEHNOLOGII" ( Moscow, RU ) | Oosterkamp Oosterbeek Octrooien ( Oosterbeek, NL ) |
| Oohiro Works, Ltd. | OOO "SPORT TECHNOLOGY" ( Moscow, RU ) | ootsuki |
| Oohiro Works, Ltd.( Osaka ) | OOO DELSI ( St. Petersburg, RU ) | Ooya Asao( Kiryu-shi ) |
| Ooie; Tatsuhiko( Oita ) | OOO DIS PLUS LTD. ( Moscow, RU ) | Ooya; Asao ( Kiryu-shi, JP ) |
| Ooltewah Manufacturing, Inc. ( Ooltewah, TN ) | OOO MT Group( Moscow ) | Ooyama Tofu Co., LTD( Kanagawa ) |
| Ooma, Inc. | OOO PKF "Atlantis-Pak" | OP CONTROLS S.p.A. |
| Oon Yeong Kuang ( Scoresby, Victoria ) | OOO PKF "Atlantis-Pak"( WI ) | Op Controls S.p.A.( Pernumia ) |
| Oon; Yeong Kuang ( Scoresby, Victoria ) | Oops-Oops, Inc. ( Kansas City, MO ) | |
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