| January 15, 2021: |
Mita Asset Management Co., Ltd. is established with a five-million-yen capital and Mr. Masamichi Idemitsu is appointed President and Representative Director |
| February 2021: |
Head office moved to Freund MITA 804, 14-5 Mita 2-chome, Minato-ku, Tokyo, Japan. Increased capital to 100 million yen |
| March 2021: |
Registered trade name changed to Mita Kosan Co., Ltd. and head office moved address to Freund MITA 606, 14-5 Mita 2-chome, Minato-ku, Tokyo |
| October 2021: |
Deetex Shokai K.K. became a group company (currently Idemitsu Shokai Co., Ltd.) |
| October 2021: |
Powerlink Co., Ltd. became a group company |
| April 2022: |
Head office moved to 9F Ichigo Mita Building, 5-13-18 Shiba, Minato-ku, Tokyo |
| August 2022: |
Signed sponsorship agreement with professional tennis player Naoki Tajima |
| Oct. 2022: |
Purchased Mitsuwa Mita Building (now MA Building Mita II) office building |
| November 2022: |
Signed sponsorship agreement with professional tennis player Naho Sato |
| March 2023: |
MA Building Mita Nichome newly completed [Design Company: APA Associates, Construction Company: Koukensha Co.] |
| April 2023: |
MA Building Shiba newly completed [Design Company: Okada Sogo Keikaku, Construction Company: Hyuga Kouhatsu Corporation] |
| September 2023: |
Dedication ceremony and party for MA Building Mita (at Okura Tokyo, Heian Room) |
| November 2023: |
MA Building Mita newly completed [Design/Construction Company: Takamatsu Construction Co.] |
| February 2024: |
Japan Dates Enterprise Co., Ltd. became a group company (currently Idemitsu Shokai Co., Ltd.) |
| June 2024: |
MA Building Shiba II newly completed [Design Company: Okada Sogo Keikaku, Construction Company: Watanabe Construction Co.] |
| August 2024: |
Office expanded to additional floors (second floor of Ichigo Mita Building) due to business growth |
| September 1, 2024: |
Idemitsu Shokai Co., Ltd. established |
| December 1, 2025: |
Idemitsu Shokai Holdings Co., Ltd. established |
