Japan Stock of the Day | Kabutaro & Friends

On October 6, 2026, the most talked-about Japanese stock online was BroadBand Security <4398>.
Background: With a series of personal data leaks at major companies, cybersecurity stocks were bought across the board on October 6. On September 28, car-sharing service Times Car announced that up to about 6.6 million member records had been leaked through unauthorized access detected on September 25, including images of driver's licenses and other documents for about 1.6 million accounts. The stock of the company, which provides information security services such as vulnerability assessments and monitoring, hit its daily limit and closed up 400 yen (+26.28%) at 1,922 yen, a year-to-date high. That day's top gainers included other security-related stocks such as GRCS, S&J, SecuAvail, and Cyber Security Cloud, and security stocks led the TSE Growth Market. Its market capitalization is 8.9 billion yen.