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The Wall Street Journal

Oct. 1, 2020, 12:10 a.m. EDT

Trading halted on Tokyo Stock Exchange after system error

Day’s entire session called off; exchange’s operator says no signs of hacking

By Suryatapa Bhattacharya and Kosaku Narioka


AFP/Getty Images
A pedestrian walks past an electronic quotation board displaying share prices of the Tokyo Stock Exchange, center, and other markets in Tokyo on Sept. 17.

The Tokyo Stock Exchange halted all stock trading for Thursday’s session due to a system problem, a rare glitch that market participants said could undermine trust in the exchange.

After trading was halted for the morning session, the exchange said at midday that no trading would take place for the rest of the day. It said it didn’t know yet whether trading could resume Friday.

A spokesman for the exchange’s operator, Japan Exchange Group Inc. (TKS:JP:8697)  , said it didn’t see signs of hacking. In August, a cyberattack from overseas caused four days of shutdowns at New Zealand’s stock market.

The Tokyo problem, which involved the part of the system that distributes price information, was discovered at about 7 a.m. local time, two hours before the stock market normally opens. “We apologize to investors and market participants for causing disruption,” the exchange said in a statement.

It said Thursday’s problem marked the first time an entire day of stock trading was halted since the exchange moved to a fully computerized trading system in 1999.

An expanded version of this report appears on WSJ.com.

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