Comprehensive Security Assurance Co., Ltd. was established in July 1965 (Showa 40).
Establishment of Sōgō Keibi Hoshō Co., Ltd.
Obtained Security Industry Law Certification No. 1 (Tokyo Metropolitan Public Safety Commission) in March 1983 (Showa 58).
Security Business Act certification No. 1 (Tokyo Metropolitan Public Safety Commission)
Listed on the First Section of the Tokyo Stock Exchange in October 2002 (Heisei 14).
Listing on the First Section of the Tokyo Stock Exchange
In April 2003 (Heisei 15), the on-site security division of Comprehensive Security Assurance was spun off into an independent company, establishing Sojo On-Site Security Co., Ltd. (Headquarters: Nishi Gotanda, Shinagawa-ku, Tokyo).
The on-site security division of Sōgō Keibi Hoshō was spun off into an independent company, establishing Sōkeijōjū Keibi Co., Ltd.
Security Business Act certification No. 2716 (Tokyo Metropolitan Public Safety Commission)
In July 2003 (Heisei 15), the corporate brand was changed to ALSOK.
Corporate brand changed to ALSOK
Obtained ISO 9001 certification in September 2003 (Heisei 15).
ISO 9001 certification obtained
In March 2004 (Heisei 16), the headquarters was relocated to Nakai-Koshimachi, Chiyoda-ku, Tokyo.
Headquarters relocation (Nakai-Koshimachi, Chiyoda, Tokyo)
In October 2005 (Heisei 17), the Osaka branch was spun off and ALSOK Kinki Co., Ltd. was established.
Separation of Osaka branch and establishment of ALSOK Kinki Co., Ltd.
In March 2008 (Heisei 20), obtained Security Business Act certification No. 30002716 (Tokyo Metropolitan Public Safety Commission).
Security Business Act certification No. 30002716 (Tokyo Metropolitan Public Safety Commission)
In July 2008 (Heisei 20), the headquarters was relocated to Kinshi, Sumida-ku, Tokyo.
Headquarters relocation (Kinshi, Sumida, Tokyo)
In January 2015 (Heisei 27), ISO 27001 certification was obtained.
ISO 27001 certification obtained
In July 2015 (Heisei 27), the company name was changed from Sōkeijōjū Keibi Co., Ltd. to ALSOK Jōjū Keibi Co., Ltd.
Company name change from Sōkeijōjū Keibi Co., Ltd. to ALSOK Jōjū Keibi Co., Ltd.
Six members from our company, representing the ALSOK Shogi Club, participated in the occupational group shogi tournament hosted by the Japan Shogi Association at the Tokyo Gymnasium. They advanced to the top four in Class A, making it a meaningful day that strengthened camaraderie among employees.
On October 28, 2026, at the award ceremony of the Tokyo Security Association, three of our employees received the Excellent Security Officer Award and five received the Security Officer Excellence Award. We will continue to strive to improve security quality and provide even greater safety and peace of mind.
On November 6, our company participated in the 20th ALSOK Group Kendo Tournament held at the Tokyo Budokan. In the first round of Division 1, we narrowly lost to the Ibaraki branch, but in the retention decision tournament, we defeated ALSOK Fukushima 2-1 to secure a place in Division 1.
On October 27, 2026, an employee working at a facility contracted by our company in Chiyoda Ward received a Fire Safety Award from the Tokyo Fire Department. The award was given in recognition of the employee’s rapid and appropriate rescue efforts during an emergency incident that occurred within the security‑protected facility.
Dialogue Session for New Graduates of Fiscal Year 2026
An announcement stating 'Hold the Offer Acceptance Ceremony' was published on October 1, 2026.
This article reports that ALSOK Stationary Security Co., Ltd. received an appreciation letter from the Tokyo Fire Department's Emergency Division Director.
Participated in the 68th All Japan Industrial and Commercial Kendo Tournament.
Shiba District Self-Defense Firefighting Drill Contest
This is an announcement dated September 11, 2026. ALSOK Security Co., Ltd. informs that it received a Fire Chief Appreciation Letter from the Tokyo Fire Department.