| 08/1973 | Established for the purpose of trade as a rental recording studio etc |
| 12/1974 | Began studio work with the completion of the Heibon Trading Co., Ltd. Onkio building |
| 12/1976 | Installed the VTR editing research room |
| 10/1979 | Commenced postproduction work in annexed picture room, as well as moved and increased equipment there. |
| 12/1986 | Installed a CD mastering room |
| 04/1999 | Started video production work and established a production planning room. |
| 04/2000 | Began DVD authoring work |
| 04/2003 | Set up INHAUS RECORDS and began music production work |
| 05/2009 | Started Blu-ray authoring |
| 10/2011 | Opened In-Flight Entertainment Production Center
With MPAA inspection completed, our in-flight entertainment production technology office has been opened. |
| 12/2012 | Added the 5th editing room |
| 10/2017 | Launched online delivery service for TV commercials |
| 11/2020 | Our feature film Onkio Haus Melody-Go-Round begins showing in Japan |
| 03/2022 | Opens refurbished mastering room with Dolby Atmos/Sony 360 AR support in Studio No. 7 |
| 10/2022 | Launches Onkio Acoustics plug-in software |
| 08/2023 | Celebrates 50th Anniversary |
