| 1871 | First year of modern business |
|---|---|
| 1904 | Company symbol created Koizumi Unlimited Partnership established |
| 1943 | Goko Seiki Kogyo Co., Ltd., Osaka aircraft gauge manufacture and sales business, purchased Capital ¥190 thousand (Koizumi Sangyo Corporation predecessor established) |
| 1945 | Factory closed at the end of the war and transferred to affiliated company Koizumi Co., Ltd. |
| 1946 | Name changed to Koizumi Sangyo Corporation Operations restarted with focus on the manufacture and wholesaling of electrical, gas and petroleum instruments |
| 1953 | Tokyo sales office opened |
| 1957 | Lighting business focus begun |
| 1961 | Hiroshima and Fukuoka sales offices opened |
| 1962 | Nagoya sales office opened |
| 1965 | Capital increased to ¥250 million |
| 1967 | Furniture business focus begun |
| 1972 | Soka distribution center opened in Soka-shi, Saitama |
| 1973 | Capital increased to ¥1 billion |
| 1974 | Capital increased to ¥1.5 billion |
| 1976 | Lighting Creative Room (LCR) established |
| 1978 | Osaka Chamber of Commerce and Industry recognized Koizumi for an “Enterprise Century” |
| 1979 | Capital increased to ¥1.575 billion |
| 1981 | New Sendai sales office building completed MATEC Corporation, Hello Living Co., Ltd. established |
| 1982 | Lighting Caravan mobile showroom started |
| 1986 | CI strategy initiated and New Wave business focus begun Facility lighting business emphasized (Change from Hikari brand to Koizumi brand) |
| 1987 | Construction industry certification (electrical installation) received Ordinary type 2 electrical transmission certification (Ministry of Posts and Telecommunications) received Koizumi International Lighting Design Competition for Students started |
| 1990 | Koizumi lifestyle showroom IZML Osaka opened Tokyo Branch completed Koizumi Lighting Theater IZM opened |
| 1991 | Koizumi Technology Development Center opened Koizumi Lighting Corporation established as a directly managed lighting fixture manufacturing plant |
| 1993 | 50th anniversary of the establishment of the Koizumi Sangyo Group Birdhouse exhibition sponsored |
| 1994 | New Higashi-Osaka office building completed (product development investigation office and photography studio opened) Koizumi Lightworks Studio izm ATC opened |
| 1995 | Koizumi Lighting Square izmL Yokohama opened |
| 1996 | Koizumi Lightworks Studio izm Hiroshima opened Milan office opened |
| 1997 | New head office building completed |
| 1999 | Koizumi Lighting Square IZML ATC opened |
| 2000 | Dongguan, China office opened |
| 2001 | Dalian, China office opened ISO9001 certification received |
| 2002 | ISO14001 certification received Koizumi Sangyo (H.K.) Co., Ltd. established |
| 2003 | Koizumi Sangyo Group 60th anniversary |
| 2005 | Koizumi Lighting showroom Nagoya renewal opened |
| 2006 | In April, Koizumi Lighting Technology Corporation (capital ¥300 million) founded as an independent company from Koizumi Sangyo Corporation |
| 2007 | Koizumi Lighting showroom Fukuoka renewal opened Koizumi Lighting showroom Tokyo renewal opened A base office of marketing strategy “OBAL” opened |
| 2008 | LED light product series “cledy” placed on the market Koizumi Lighting showroom Osaka renewal opened |
| 2009 | Capital increased to ¥450 million High color rendering LED (Ra97) products announced in Lighting Fair |
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