KOIKE SANSO KOGYO postponed its interim earnings announcement for the fiscal year ending March 2027 due to a cyberattack, withdrawing the announcement date originally scheduled for 9 November. The ransomware group Exitium claims to hold approximately 5.8 TB of data. A new announcement date has yet to be determined, with the company expected to assess the status of recovery.
On 21 October 2026, KOIKE SANSO KOGYO announced that it would postpone its interim earnings announcement due to the impact of a cyberattack that occurred on 5 October. Because recovery work and the processing of financial results had been delayed, the originally scheduled date of 9 November was cancelled, and a new date after the postponement has not been determined.
The disclosure dated the same day also confirmed that electronic files suspected of having been leaked had been made public on the internet. Exitium claims to hold approximately 5.8 TB of information, but the company's announcement does not substantiate the actual volume of data or identify the perpetrators.
The company explained that the earnings announcement is expected to fall more than 45 days after the statutory filing deadline, and that the postponement and the filing status of the semiannual report are being treated as separate matters. No accounting irregularities have been indicated at this time, but the system outage is being treated as a significant factor behind the delay in processing the financial results.