Chronology
| 1915 | Apr. | Koito Genrokuro Shoten founded. (Kyobashi, Tokyo) Production and sales of Fresnel Lenses for railway signal lamps begin. |
| 1935 | Feb. | Shinagawa Plant opens. (Tokyo, Japan) |
| 1936 | Apr. | KOITO MANUFACTURING CO., LTD. incorporated. (capital ¥2.5 million) |
| 1943 | Apr. | Shizuoka Plant opens. (Shizuoka, Japan) |
| 1949 | May | Koito Manufacturing listed on both the Tokyo and Osaka Stock Exchange. |
| 1957 | Aug. | Koito Electric Manufacturing Co., Ltd. established. |
| Oct. | Production and sales of All Glass Sealed Beam Headlamps begin. | |
| Dec. | Osaka Branch opens. (Osaka, Japan) | |
| 1962 | Jan. | Koito Electric absorbed and merged. |
| 1967 | Apr. | Part of the business spun off to Koito Industries, Limited. |
| 1968 | Aug. | Chicago Representative Office opens. (Illinois, U.S.A.) |
| 1970 | Mar. | Headquarters building completed. (Minato Ward, Tokyo) |
| Oct. | Toyota Branch opens. (Aichi, Japan) | |
| 1971 | Feb. | Production and sales of Marine Lamps begin. |
| 1972 | Jul. | Aircraft equipment and electronics plant opens. (Shizuoka, Japan) |
| Dec. | Hiroshima Branch opens. (Hiroshima, Japan) | |
| 1974 | Oct. | Production and sales of Miniature Bulbs for automobiles begin. |
| 1975 | Aug. | Production and sales of Headlamp Cleaners begin. |
| 1977 | Aug. | Haibara Plant opens. (Shizuoka, Japan) |
| 1978 | Jul. | Production and sales of Halogen Headlamps begin. |
| 1979 | Jun. | Production and sales of Aerodynamic-type Headlamps begin. |
| 1980 | Apr. | Seattle Representative Office opens. (Washington, U.S.A.) |
| 1982 | Apr. | Production and sales of Automotive Halogen Bulbs begin. |
| 1983 | Apr. | North American Lighting, Inc. established. (Illinois, U.S.A.) |
| 1984 | May | Swiss franc-denominated, privately placed, unsecured convertible bonds issued. (SFR 50 million) |
| 1985 | Apr. | 70th anniversary.
“Conception and Execution” corporate slogan introduced. |
| 1986 | Aug. | THAI KOITO COMPANY LIMITED established. (Bangkok, Thailand) |
| Sep. | Kikkawa Plant opens. (Shizuoka, Japan) | |
| Dec. | Sagara Plant opens. (Shizuoka, Japan) | |
| 1987 | Mar. | Second convertible bonds issued. (¥10 billion) |
| Jul. | North American Lighting, Inc. Salem Plant opens. (Illinois, U.S.A.) | |
| 1988 | Mar. | Koito Industries, Limited listed on the second section of the Tokyo Stock Exchange. |
| Apr. | Capital interest in Ta Yih Industrial Co., Ltd. acquired. (Tainan, Taiwan) | |
| 1989 | Feb. | Shanghai Koito Automotive Lamp Co., Ltd. established. (Shanghai, China) |
| 1992 | May | Fujikawa Tooling Plant opens. (Shizuoka, Japan) |
| 1993 | Feb. | North American Lighting, Inc. Technical Center opens. (Michigan, U.S.A.) |
| 1996 | May | Capital interest in Britax Vega Limited acquired. (Droitwich, U.K.) |
| Jul. | Production and sales of Gas Discharge Headlamps begin. | |
| 1997 | Mar. | Technical Center in Shizuoka Plant opens. (Shizuoka, Japan) |
| Apr. | INDIA JAPAN LIGHTING PRIVATE LIMITED established. (Tamil Nadu, India) | |
| Oct. | Ta Yih Industrial Co., Ltd. listed on the Taiwan Stock Exchange. | |
| 1998 | Jul. | THAI KOITO COMPANY LIMITED becomes a KOITO subsidiary. |
| Jul. | Britax Vega Limited becomes a KOITO subsidiary. | |
| Oct. | North American Lighting, Inc. becomes a KOITO subsidiary. | |
| 1999 | Apr. | Britax Vega Limited becomes Koito Europe Limited. |
| 2000 | Jul. | Certified ISO14001. |
| Aug. | Production and sales of High/Low Switchable Discharge Headlamps begin. | |
| 2001 | Jan. | Certified QS-9000/ISO9001. |
| Mar. | Koito Czech s.r.o. established. (Zatec, Czech Republic) | |
| 2002 | Jul. | North American Lighting, Inc. Paris Plant opens. (Illinois, U.S.A.) |
| 2003 | Feb. | Production and sales of the world’s first swivel AFS (Adaptive Front Lighting System) begins. |
| Apr. | Production and sales of Discharge Bulbs begins. | |
| 2004 | Jul. | Production and sales of the world’s first Mercury-free Discharge Headlamps begins. |
| Nov. | Koito Europe NV established. (Leuven, Belgium) | |
| 2005 | Sep. | FUZHOU TAYIH INDUSTRIAL CO., LTD. becomes a KOITO subsidiary. (Fuzhou, China) |
| Nov. | KOITO KYUSHU LIMITED established. (Saga, Japan) | |
| Nov. | GUANGZHOU KOITO AUTOMOTIVE LAMP CO., LTD. established.(Guangzhou, China) | |
| 2006 | May | Certified ISO/TS16949. |
| Jul. | Production of All Glass Sealed Beam Headlamps ends. (Production TTL: 430 million units) | |
| Oct. | KOITO KYUSHU LIMITED Plant opens. (Saga, Japan) | |
| 2007 | Mar. | GUANGZHOU KOITO AUTOMOTIVE LAMP CO., LTD. Plant opens. (Guangzhou, China) |
| May | Production and sales of the world’s first LED Headlamps begins. | |
| Jul. | North American Lighting, Inc. Alabama Plant opens. (Alabama, U.S.A.) | |
| Sep. | INDIA JAPAN LIGHTING PRIVATE LIMITED Bawal Plant opens.(Haryana, India) | |
| 2008 | Feb. | FUZHOU TAYIH INDUSTRIAL CO., LTD. becomes FUZHOU KOITO TAYIH AUTOMOTIVE LAMP CO., LTD. |
| Sep. | KOITO KYUSHU LIMITED Second Plant opens. (Saga, Japan) |
| 2010 | Jun. | PT. INDONESIA KOITO established. (West Java, Indonesia) |
| 2011 | Apr. | PT. INDONESIA KOITO Plant opens. (West Java, Indonesia) |
| Aug. | Koito Industries, Limited. becomes KI HOLDINGS CO., LTD. | |
| 2012 | Jan. | North American Lighting, Inc. Alabama Second Plant opens. (Alabama, U.S.A.) |
| Mar. | North American Lighting, Inc. Indiana Tooling Plant opens. (Indiana, U.S.A.) | |
| Apr. | THAI KOITO COMPANY LIMITED Prachinburi Plant (Prachinburi, Thailand) and Technical Center (Bangkok, Thailand) open. | |
| Dec. | North American Lighting Mexico, S.A. de C.V. established. (San Luis Potosi, Mexico) | |
| 2013 | Mar. | INDIA JAPAN LIGHTING PRIVATE LIMITED Chennai Second Plant opens. (Tamil Nadu, India) |
| Sep. | GUANGZHOU KOITO AUTOMOTIVE LAMP CO., LTD. Second Plant opens. (Guangzhou, China) | |
| 2014 | Jan. | North American Lighting, Inc. Alabama Plant expanded. (Alabama, U.S.A.) |
| Mar. | North American Lighting, Inc. Paris Plant expanded. (Illinois, U.S.A.) | |
| Sep. | North American Lighting Mexico, S.A. de C.V. Plant opens. (San Luis Potosi, Mexico) | |
| Sep. | Hubei Koito Automotive Lamp Co., Ltd. established. (Hubei, China) | |
| Nov. | Production and sales of the world's first LED Compact-Bi-function begins. | |
| 2015 | Apr. | Koito celebrates its 100th anniversary. |
| 2016 | Jun. | Hubei Koito Automotive Lamp Co., Ltd. Plant opens. (Hubei, China) |
| 2017 | Jan. | NAL do Brasil Indústria e Comércio de Componentes de Iluminação Ltda. established. (São Paulo, Brazil) |
| Apr. | R&D Lab in Silicon Valley opens. (California, U.S.A.) | |
| Oct. | KOITO MALAYSIA SDN. BHD. established. (Negeri Sembilan, Malaysia) | |
| 2018 | Mar. | KOITO Sells all portions of shares of Shanghai Koito Automotive Lamp Co., Ltd. and dissolved joint venture. |
| May | NAL do Brasil Indústria e Comércio de Componentes de Iluminação Ltda. Plant opens. (São Paulo, Brazil) | |
| Nov. | FUZHOU KOITO TAYIH AUTOMOTIVE LAMP CO., LTD. Plant expanded. (Fuzhou, China) | |
| 2019 | Mar. | PT. INDONESIA KOITO Plant expanded. (West Java, Indonesia) |
| Jun. | Capital interest in BrightWay Vision Ltd. acquired. (Haifa, Israel) | |
| Jul. | North American Lighting Mexico, S.A. de C.V. Plant expanded. (San Luis Potosi, Mexico) | |
| Aug. | KI HOLDINGS CO., LTD. becomes a wholly-owned subsidiary. | |
| Aug. | Production and sales of the world's first BladeScan TM ADB (Adaptive Driving Beam) begins. | |
| Nov. | KOITO MALAYSIA SDN. BHD. Plant opens. (Negeri Sembilan, Malaysia) | |
| Dec. | INDIA JAPAN LIGHTING PRIVATE LIMITED becomes a wholly-owned subsidiary. |
| 2020 | Apr. | KI HOLDINGS CO., LTD. absorbed and merged. |
