On October 1, 2020, a system failure stopped trading on the Tokyo Stock Exchange for the whole day. At 4:30 in the afternoon, its president, Miyahara Kōichirō, held a press conference with the group’s chief information officer, who answered the technical questions.
Asked whether responsibility would be discussed with Fujitsu, which had supplied the equipment, Miyahara said that the responsibility as market operator lay entirely with the exchange. He resigned at his own wish at the end of November.
The later investigation report found that errors in a product manual were the responsibility of Fujitsu, which had written it.