Tokyo Stock Exchange Crashed in 2005: A 4.5-Hour Software Bug

Sun, 01 Nov 2026 05:00:00 -0300

On Tuesday, November 1, 2005, operators at the Tokyo Stock Exchange switched on the trading system at 6:30 a.m., like any other business day. The system read a file, decided something was wrong and stopped. Asia's largest bourse went four and a half hours without trading stocks. There was no intruder, no ransomware, no attack: it was a bug sleeping in the code that woke up on the worst possible day.

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Tokyo Stock Exchange Crashed in 2005: A 4.5-Hour Software Bug