Japan's financial markets suffered another sharp setback on October 22 as heavy selling in semiconductor and artificial intelligence-related stocks sent the Nikkei 225 down 1,713.40 points, or 2.65%, to 62,907.84, its lowest closing level since July 30.
Japan's trade deficit nearly doubled in the first half of fiscal 2026 to 2.8184 trillion yen, driven largely by surging crude oil prices following turmoil in the Middle East, while the value of oil imports from the United States increased nearly ninefold as Japan sought alternative sources of supply.
A growing wave of cyberattacks across Japan has raised concerns over the possible use of Chinese-developed artificial intelligence in hacking operations, with personal information belonging to tens of thousands of police employees potentially exposed and major companies forced to suspend online services, while cybersecurity experts warn that slow decision-making within Japanese organizations is allowing damage to spread.
Tokyo stocks rebounded on October 21, with the Nikkei 225 closing 545.82 points higher at 64,621.24, a gain of 0.85%, as stronger U.S. equities, renewed buying in technology shares and encouraging Japanese export figures helped the market recover from two consecutive sessions of losses.
Japanese banks and securities firms are moving to stop using facial photographs from driver's licenses to verify customers opening accounts online, following a series of personal information leaks that have raised concerns about fraudulent account applications.
Japan's Nikkei 225 Stock Average closed at 64,075.42 on October 20th, falling 841.28 points, or 1.30%, as renewed selling in semiconductor and artificial intelligence-related shares, rising oil prices and concerns over inflation pushed Tokyo stocks lower for a second consecutive session.
Nearly one in three large companies in Japan have experienced a data leak or a suspected breach, according to a survey released by Teikoku Databank on October 19th, highlighting growing concerns over corporate information security as unauthorized access incidents continue to affect businesses across the country.
Japan's Nikkei Stock Average closed 407.59 points lower at 64,916.70 on October 19, a decline of 0.62%, recovering from an intraday plunge of more than 1,400 points as concerns over artificial intelligence investment weighed on semiconductor and technology shares, while buying in banks, utilities and other domestic sectors helped the broader TOPIX index finish slightly higher.