www.jpx.co.jp/derivatives/rules/margin/index.html

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https://www.jpx.co.jp/derivatives/rules/margin/index.html

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This page explains margin requirements for futures and options trading on the Japan Exchange Group. Margin is required to ensure settlement when losses occur from changes in underlying asset prices. In futures trading, both sellers and buyers must post margin. In options trading, sellers must post margin as losses can expand, but buyers do not need to post margin since losses are limited to the premium. Required margin amounts are calculated using the VaR method.