Keio stock: Keio confirms ransomware claims. What it means for Keio stock

Published on 10/23/2026 at 01:47 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS

Qilin listed Keio on October 16, 2026. Keio stock posted JPY 496.9 billion revenue in fiscal 2026, up 9.72 percent year over year.

Cybersecurity and earnings dates

Qilin listed Keio on October 16, 2026, while the company examined the alleged data release.
Fiscal 2026 revenue reached JPY 496.9 billion, an increase of 9.72 percent.
Keio Corporation is scheduled to publish its second-quarter fiscal 2027 results on November 10, 2026.

Keio, JP3277800003, Illustration mit AI erstellt.

Keio Corporation (ISIN JP3277800003) last stood at JPY 759.10 on the Tokyo Stock Exchange on October 22, 2026 at 3:30 p.m. JST. The latest company risk centers on a claimed data release linked to the ransomware incident that disrupted parts of the group.

On October 16, 2026, Japan Cyber Watch reported that Qilin had listed Keio on its leak site. Keio said a group claiming responsibility had published part of the information held by the group and that the authenticity of the material was being examined with outside experts.

Claims add a new risk

The incident began on September 26, 2026, when a ransomware attack caused system failures at parts of the Keio Group. TechTarget reported that Keio isolated affected networks and that customer-facing delays reached Keio Plaza Hotel Tokyo, while train operations continued normally.

The October 16 claim therefore raises a separate question from the original outage: whether the published material is genuine and whether customer information was exposed. The company response described by Japan Cyber Watch involved a group-wide response headquarters, police cooperation and external specialists.

What does the incident mean?

For the stock, the financial cushion remains material but does not remove execution risk. Keio reported JPY 496.9 billion in fiscal 2026 revenue, up 9.72 percent, according to El Fondo. That scale gives investors a concrete operating benchmark as the group works through system restoration and the investigation.

November results set the next test

The next scheduled reporting date is November 10, 2026. TradingView identifies that date for Keio's second-quarter fiscal 2027 results. The release should give investors a further quantified view of revenue, profitability and any financial effect from the cyber incident.

Keio's valuation context is also measurable. El Fondo lists a market capitalization of JPY 439.4 billion and a 52-week range of JPY 711.30 to JPY 849.30 as of October 22, 2026. The JPY 759.10 price sits inside that band, leaving the November report and the cyber investigation as separate reference points for the stock.

Stock and valuation context

Keio stock last stood at JPY 759.10 on the Tokyo Stock Exchange on October 22, 2026 at 3:30 p.m. JST. The Tokyo listing uses ticker 9008, and the company operates railway, real estate, retail and hotel businesses.