日經225指數5月20日（週三）開盤下跌122.45點，跌幅0.20%，報60428.14點。

The Korea Exchange is planning to introduce weekly options on individual stocks in June, with contracts set to expire on Thursdays, according to people familiar with the matter. The move is aimed at giving investors more tools to trade volatility in South Korea’s equity market. The exchange is also preparing to expand derivatives trading later this year, including monthly and weekly options on ETFs, as well as additional expiry days—Tuesday, Wednesday and Friday—for weekly contracts linked to the Kospi 200 and Kosdaq 150 indexes, which currently expire only on Mondays and Thursdays.

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