| 1898 | Inventor Eiichi Okuma founded his own business, the Okuma Noodle Machine Co., to manufacture and sell noodle-making machines |
| 1904 | Manufacture and sales of machine tools started |
| 1918 | Okuma Machinery Works Ltd established, Sales of OS lathe launched |
| 1937 | Okuma's machine tool production (value) of machine tools became No.1 in Japan |
| 1963 | Developed the Okuma Control (OSP) with absolute position feedback encoder, Became Japan's only comprehensive manufacturer of both Machine & Control |
| 1966 | Manufacture of LA-N NC lathes and MDB double-column machining centers started |
| 1974 | Manufacture of MCM double-column machining centers (5-sided applications) started |
| 1975 | Manufacture of LS-N NC lathes started |
| 1976 | USA and Europe liaison offices opened |
| 1980 | Main operations relocated from the old headquarters plant (Nagoya) to Oguchi |
| 1982 | Manufacture of LB15 NC lathes started |
| 1987 | Okuma Machine Tools Inc established in the US (manufacturing) |
| 1990 | Okuma Singapore Branch set up |
| 1991 | Corporate name changed to Okuma Corporation |
| 1995 | Okuma America Corporation established in the US |
| 1997 | Okuma Nanjing office opened Okuma South Germany Resource Center opened Okuma Latino Americana Ltda established Tatung-Okuma Co., Ltd established (Taiwan, manufacturing) |
| 1998 | Manufacture of SPACE TURN series NC lathes started |
| 2000 | The IT PLAZA was launched, a new IT manufacturing system, Okuma Techno (Thailand) established |
| 2001 | Manufacture of ACE CENTER MB-V series vertical machining centers started, Okuma Australia Pty established (liaison since 1973), Okuma Machinery (Shanghai) Co. Ltd established |
| 2002 | BYJC-OKUMA (Beijing) Machine Tool Co. Ltd established (manufacturing) |
| 2003 | Received Japan Society of Mechanical Engineers Award for "Thermal Deformation Compensation System," the core of the Thermo-Friendly Concept |
| 2005 | 3-company integration (Okuma, Okuma & Howa and Okuma Engineering) |
| 2006 | 4-company merger (Okuma Holdings, Okuma, Okuma & Howa and Okuma Engineering) |
| 2007 | Okuma India Pvt Ltd established |