Tokyo Stock Exchange resumes trading after technical outage

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Koichiro Miyahara, center, President and CEO of Tokyo Stock Exchange, Inc. (TSE), and other officers attend a press conference at the Tokyo Stock Exchange Thursday, Oct. 1, 2020, in Tokyo. Trading on the Tokyo Stock Exchange was suspended Thursday because of a problem in the system for relaying market information. Most other Asian markets were closed for national holidays. (AP Photo/Eugene Hoshiko)

TOKYO – Tokyo Stock Exchange resumed normal operations Friday after repairs of malfunctions in its computer systems that halted trading for an entire day in the worst such outage ever.

The Nikkei 225 index jumped 0.7% to 23,354.51 shortly after opening following reports Japan is considering fresh stimulus for the economy.

There was no indication that the outage at the world's third-largest exchange resulted from hacking or other cybersecurity breaches.

“We are extremely sorry for the troubles we have caused,” exchange President and Chief Executive Koichiro Miyahara told reporters late Thursday.

Miyahara and other exchange officials said a computer hardware device they called “machine one” failed and the backup “machine two” didn’t kick in, so stock price information was not being relayed properly.

The officials characterized the problem as a memory malfunction and said that rebooting the system during a trading session would have caused confusion for investors and other market participants.

Perplexed passers-by studied quote-less electronic screens in Tokyo's financial district and newspapers' evening editions carried listed company's names, but blank prices.

Brokerages were fielding a flood of calls from frustrated investors.