| 1930 |
Established Dai-ichi Mutual Housing Co., Ltd. in 1930 |
| 1930 |
Established Daiichi Mutual Housing Co., Ltd. |
| 1930 |
Founded in 1930 |
| 1943 |
Renamed to Dai-ichi Architecture Co., Ltd. in 1943 |
| 1943 |
Renamed to Daiichi Kenchiku Co., Ltd. |
| 1946 |
Renamed to Dai-ichi Construction Co., Ltd. in 1946 |
| 1946 |
Renamed to Daiichi Kensetsu Co., Ltd. |
| 1956 |
Renamed to Dai-ichi Kensetsu Kogyo Co., Ltd. in 1956 |
| 1956 |
Renamed to Daiichi Kensetsu Kogyo Co., Ltd. |
| 1963 |
Opened Tokyo branch in 1963 and listed our shares on the Tokyo and Osaka Stock Exchanges and the Second Section of the market |
| 1963 |
Opened Tokyo Branch |
| 1963 |
Listed our shares on the Tokyo and Osaka Stock Exchanges, and the Second Section of the Tokyo Stock Exchange |
| 1970 |
Opened Daiei Senbon Store, Red Dragonfly Plaza Shopping Center, and Shin-Kobe Oriental Hotel/OPA in 1970 |
| 1979 |
Formed a business alliance with Daiei Inc. in 1979 |
| 1979 |
Business alliance with Daiei Inc. |
| 1982 |
Opened Fukuoka Sales Office (now Kyushu Branch) in 1982 |
| 1982 |
Established Fukuoka Sales Office (now Kyushu Branch) |
| 1985 |
Merged with Tateno Development Co., Ltd. and established Tateno Development Office (former Red Dragonfly Plaza Shopping Center) in 1985 |
| 1985 |
Merged with Tatsuno Development Co., Ltd. and established Tatsuno Development Office (former Akatonbo Plaza Shopping Center) |
| 1986 |
Opened Okinawa Sales Office in 1986 |
| 1986 |
Established Okinawa Sales Office |
| 1988 |
Opened Sapporo Sales Office (now Sapporo Branch) in 1988 |
| 1988 |
Established Sapporo Sales Office (now Sapporo Branch) |
| 1988 |
Relocated head office to Chuo-ku, Kobe City |
| 1989 |
Changed the company name to Ichiken Corporation and moved the head office to Chuo-ku, Kobe in 1989 |
| 1989 |
Changed trade name to Ichiken Co., Ltd. |
| 1989 |
Changed head office to Chuo-ku, Kobe City |
| 1989 |
Established Osaka Sales Office (now Kansai Branch) |
| 1990 |
Listed our shares on the Tokyo and Osaka Stock Exchanges and the First Section of the market in 1990 |
| 1990 |
Listed our shares on the Tokyo and Osaka Stock Exchanges, First Section Market |
| 1994 |
Opened Sendai Sales Office and Nagoya Sales Office (now Nagoya Branch) in 1994 |
| 1994 |
Established Sendai Sales Office and Nagoya Sales Office (now Nagoya Branch) |
| 1996 |
Relocated the headquarters office to Minato Ward, Tokyo, Hamamatsucho, in 1996 |
| 1996 |
Relocated head office to Minato-ku, Tokyo, to Hamamatsucho |
| 2000 |
Established Chuo Gakuen Ryutsu Science University, Wo City Misato, and QizMALL Ryugasaki in 2000 |
| 2004 |
Formed a capital alliance with Maruhan Corporation in 2004 |
| 2004 |
Capital alliance with Maruhan Co., Ltd. |
| 2008 |
Changed the main office location from Chuo Ward, Kobe City, to Taito Ward, Tokyo, in 2008, and delisted from the Osaka Securities Exchange |
| 2008 |
Changed head office location from Chuo-ku, Kobe City to Taito-ku, Tokyo |
| 2008 |
Discontinued listing on the Osaka Securities Exchange |
| 2010 |
Opened iTeras Ochiai Minami Nagasaki, BMW GROUP Tokyo Bay, and Hainan City New Government Building in 2010 |
| 2015 |
Relocated the headquarters office to Minato Ward, Tokyo, in 2015, and changed the main office location to Hamamatsucho, Minato Ward, Tokyo |
| 2015 |
Relocated head office to Minato-ku, Tokyo, and changed head office location to Hamamatsucho, Minato-ku, Tokyo |
| 2017 |
Established Hiroshima Sales Office in 2017 |
| 2017 |
Established Hiroshima Sales Office |
| 2018 |
Opened Hanoi Office (Vietnam) in 2018 |
| 2018 |
Established Hanoi Office (Vietnam) |
| 2020 |
Established a subsidiary in Vietnam, ICHIKEN Vietnam Construction Co., Ltd., in 2022, and opened Ho Chi Minh City Sales Office in 2023 |
| 2022 |
Transitioned from the First Section of the Tokyo Stock Exchange to the Prime Market in 2022 due to market classification review |
| 2022 |
Established a subsidiary in Vietnam, "ICHIKEN Vietnam Construction Co., Ltd." / (now Hanoi City Headquarters) |
| 2022 |
Moved from the First Section to the Prime Market of the Tokyo Stock Exchange due to market segment review |
| 2023 |
Chose the Tokyo Stock Exchange Standard Market in 2023 |
| 2023 |
Selected the Tokyo Stock Exchange Standard Market |
| 2024 |
Made Katayama Kogyo Co., Ltd. a subsidiary in 2024 |
| 2024 |
Made Kataoka Industries Co., Ltd. a subsidiary |
| 2025 |
Relocated the headquarters office to Shinagawa, Minato Ward, Tokyo, in 2025, and opened Ho Chi Minh City Sales Office for the subsidiary ICHIKEN Vietnam Construction Co., Ltd. |
| 2025 |
Relocated headquarters to Minato Ward, Tokyo, to Shinagawa (current Tokyo headquarters) |
| 2025 |
Established subsidiary "ICHIKEN Vietnam Construction Co., Ltd." / Ho Chi Minh City Sales Office |
| 2026 |
Opened Tokyo Sales Office for the subsidiary Katayama Kogyo Co., Ltd. in 2026 |
| 2026 |
Established subsidiary "Kataoka Industries Co., Ltd." / Tokyo Sales Office |
