The exchange said Thursday afternoon that the technical problem was due to an issue with hardware. A backup device failed to work, making it impossible to distribute market information.
The issue also appeared to affect smaller Japanese stock exchanges in Nagoya, Fukuoka and Sapporo, which share the same trading system as the TSE.
The TSE said that it is replacing the hardware “to ensure normal trading” from Friday onward.
The exchange earlier said that it “sincerely apologizes for any inconvenience caused to investors and the people related to stock market.”
The suspension is “regrettable,” said Katsunobu Kato, Japan’s Chief Cabinet Secretary, at a press conference. He added that the country’s financial regulator has ordered the exchange and its operator, Japan Exchange Group, to investigate the cause of the glitch.
When asked about the possibility of a cyberattack, Kato said that he had “not heard about such information as of now.”
The problems shut down one of the only major exchanges operating in Asia on Thursday. Other countries are celebrating public holidays, including mainland China, Hong Kong and South Korea. Markets in mainland China will remain closed for several days for the Golden Week holiday.
September wasn’t rosy for the market. Wall Street’s major indexes all recorded losses, breaking a five-month winning streak and marking the first down month since March.
For the quarter overall, things were a bit better: All three indexes ended higher, making it the second straight quarter that stocks rose following the abysmal first three months of the year.
— Jazmin Goodwin and Anneken Tappe contributed to this report.