京成建設株式会社

Keisei Construction Co., Ltd., also known as 京成建設株式会社, is a construction company headquartered in Japan. The firm operates within the Japanese construction sector, providing building and infrastructure services as indicated by its corporate name. Its primary market is domestic, serving clients across various regions of Japan. The organization’s core activities revolve around construction projects, though specific project types or portfolio details are not disclosed in the available sources. The company’s headquarters location in Japan situates it within one of the world’s largest economies and a major hub for construction activity.

In April 2022, Keisei Construction Co., Ltd. experienced an unauthorized access incident that affected its network infrastructure. The company issued technical remediation guidance advising users to verify physical network connections, restart routers and modems, and adjust firewall or antivirus permissions to allow Chrome access. Users were also instructed to reconfigure proxy server settings via browser controls or disable proxy use entirely for local networks if unintended. The response focused on restoring connectivity through device reboots and network configuration checks without detailing the incident’s origin or broader operational impacts. No further information about the scale of the breach, data compromised, or long‑term consequences has been made public.