約定取消しルール | 日本取引所グループ

This page explains the executed trade cancellation rule of the Tokyo Stock Exchange. While securities trades normally cannot be cancelled once concluded, erroneous orders could result in unusually large trades that remain unsettled for extended periods, potentially disrupting market function. To address this risk, the exchange implemented a trade cancellation rule in September 2007, allowing cancellation only when erroneous orders cause extreme market confusion and long-term settlement delays. The page provides an overview of the rule and its historical development process.