Japan Stock of the Day | Kabutaro & Friends

On October 22, 2026, the most talked-about Japanese stock online was Trend Micro <4704>.
Background: Two critical vulnerabilities were found in PHP, a programming language widely used to build websites, that could allow outsiders to execute programs without authentication, and fixed versions were released late on the night of the 21st Japan time. Attacks were observed even before the fix, and in Japan Sakura Internet and others carried out emergency maintenance, so buying gathered in security-related stocks on the Tokyo market on the 22nd. Among them, Trend Micro closed at 7,314 yen, up 585 yen (+8.69%) from the previous day, with turnover swelling to about 25.2 billion yen and market capitalization reaching about 1.03 trillion yen. The stock rose against the trend as the Nikkei Stock Average fell sharply by 1,713 yen, following the rise in cybersecurity stocks in the US the previous day. Peers FFRI Security and NEC also rose.