| Year | Month | Event |
|---|---|---|
| 1918 | 3 | Shokosha Watch Research Institute established, the forerunner of Citizen Watch Co., Ltd. |
| 1924 | 12 | First pocket watch completed. |
| 1930 | 5 | Citizen Watch Co., Ltd. established. Yosaburo Nakajima appointed president. |
| 1931 | 6 | First wrist watch completed. |
| 1936 | 5 | Tanashi Factory constructed. |
| 1941 | 7 | Production of machine tools begins. |
| 1945 | 10 | Shinji Nakajima appointed president. |
| 1946 | 3 | Eiichi Yamada appointed president. |
| 1949 | 6 | Citizen Trading Co., Ltd. established. |
| 1952 | 3 | First Japanese-made watch with a calendar introduced. |
| 1953 | 3 | Rhythm Watch Co., Ltd. becomes an affiliate. |
| 1955 | 12 | Export of wrist watches begun. |
| 1960 | 3 | Import-export agreement concluded with the U.S. Bulova Watch Co. Technical assistance agreement with India. |
| 1964 | 8 | Technology research laboratory established. |
| 12 | Citizen Business Machines established. | |
| 1965 | 3 | Production of business machines begun. (Adding machines, camera shutters) |
| 10 | Office opened in former West Germany, start of full-fledged exports to Europe. | |
| 1966 | 3 | First Japanese-made electronic watch “X-8” introduced. |
| 1970 | 3 | CNC automated lathe “Cincom” developed. |
| 1971 | 6 | Precision Machinery Division established. |
| 1976 | 3 | Production of quartz oscillators begun. |
| 1978 | 2 | Head Office moved to Shinjuku Mitsui Bldg. in Tokyo. |
| 1980 | 6 | Industry's first microcomputer controlled line impact printer introduced. |
| 1981 | 6 | Rokuya Yamazaki appointed president. |
| 10 | Systems and Peripherals Division established. | |
| 1982 | 9 | Special Sales Division established, full-fledged sales of watch components started. |
| 1983 | 3 | Chip LED lamp CL Series developed. |
| 5 | IC sensor electronic thermometer introduced. | |
| 1987 | 6 | Michio Nakajima appointed president. |
| 1990 | 1 | Citizen of the Year annual award established. |
| 1992 | 2 | Acquired German machine tool company, Boley GmbH. |
| 1993 | 5 | World's first multizone “Radio-Controlled Watch” introduced. |
| 1996 | 4 | Solar-powered Eco-Drive received the Eco Mark the first for a watch. |
| 1997 | 6 | Hiroshi Haruta appointed president. |
| 2001 | 3 | Head Office moved to Nishi-Tokyo. |
| 2002 | 3 | Sales of white LED as a backlight for color LCDs started. |
| 6 | Makoto Umehara appointed president. | |
| 2003 | 6 | World's first full metal case radio-controlled watch with built-in antenna introduced. |
| 2004 | 1 | Implemented Citizen Code of Conduct. |
| 10 | Merged with Citizen Trading Co., Ltd. | |
| 2005 | 4 | Citizen Systems Japan Co., Ltd. established. |
| 10 | Five consolidated companies (Citizen Electronics, Miyota, Cimeo Precision, Sayama Precision Industries, Kawaguchiko Precision) become wholly owned subsidiaries. Names of Citizen Group companies changed. | |
| 2007 | 4 | Company name changed to Citizen Holdings Co., Ltd. |
| 2008 | 4 | Mitsuyuki Kanamori appointed president. |
| 7 | Citizen Miyota Co., Ltd. and Citizen Finetech Co., Ltd. merge. Citizen Finetech Miyota Co.,Ltd. established. |
|
| 10 | Miyano Machinery Inc. becomes a consolidated subsidiary. | |
| 2011 | 4 | Citizen Machinery Co.,Ltd. and Miyano machinery Inc. merge. Citizen Machinery Miyano Co., Ltd. estabilished. |
| 2012 | 4 | Toshio Tokura appointed president. |
