www.jpx.co.jp/derivatives/rules/others/01.html
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ノンキャンセル・ピリオド | 日本取引所グループ
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About this page
This page explains the Non-Cancel Period (NCP) implemented by Japan Exchange Group for futures and options trading. To prevent excessive price fluctuations caused by order corrections and cancellations just before board auctions, NCP prohibits correction and cancellation orders for one minute before opening and closing auctions for multiple products including Nikkei 225 futures, commodity futures, and power futures. NCP times are 8:44-8:45 (daytime session opening) and 5:59-6:00 (night session opening). New orders are accepted during NCP.
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