Keio confirms data publication claim before Keio stock results

Published on 10/20/2026 at 01:10 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS

The listed railway operator confirmed data publication claims on October 16, 2026, while its probe continues. Keio stock had JPY 496.9 billion revenue in fiscal 2026.

Cyber incident and financial calendar

Keio confirmed a data publication claim on October 16, 2026, after 27 sample images appeared online.
Fiscal year 2026 revenue reached JPY 496.9 billion, while operating income was JPY 52.3 billion.
Keio is scheduled to report its second-quarter results on November 10, 2026.

Keio, JP3277800003, Illustration mit AI erstellt.

Keio Corporation (JP3277800003) confirmed on October 16, 2026, that an organization claiming responsibility for a ransomware attack said it had published part of Keio Group information, according to Security Measures Lab. The company is checking the claim with outside experts while railway operations continue normally.

October claim adds pressure

BigGo Finance reported that Keio confirmed the claim while investigators examine whether customer information was exposed and whether the published material is genuine. The company has established a response headquarters and is working with police and external specialists.

What does the probe mean?

The operational risk is concentrated in group business systems rather than train control. Keio disclosed the initial ransomware attack on September 26, 2026, after disruptions affected some group companies. The company said the railway network continued operating, limiting the immediate effect on passenger services.

Three incident dates and figures

On September 26, 2026, Keio identified a ransomware attack and system failures affecting group servers. On October 15, 2026, a leak-site page carried the Keio name and showed 27 images, according to Security Measures Lab. On October 16, 2026, Keio said it was examining the publication claim rather than confirming the material as authentic.

Next reporting date

Keio is scheduled to report its second-quarter results on November 10, 2026, according to Simply Wall St. The latest full-year figures cited by Paasa show fiscal year 2026 revenue of JPY 496.9 billion, up from JPY 452.9 billion in fiscal year 2025, while operating income fell from JPY 54.1 billion to JPY 52.3 billion.

Stock context before results

The latest available Tokyo Stock Exchange quote was JPY 757.30 on October 19, 2026 at 3:30 p.m. JST. Keio's market capitalization was JPY 438.4 billion, and its 52-week range was JPY 711.30 to JPY 849.30 on the same market-data snapshot. The figures put the upcoming results date alongside a concrete valuation reference for investors following the cyber investigation.