According to Mars Finance, on June 20, Citigroup estimated that on Friday, there will be notional value of $5.8 trillion in stock open contracts expiring, including $4.2 trillion in index options, $708 billion in US ETF options, and $819 billion in individual stock options. This event may increase the fluctuation of the stock market, surpassing the relatively mild changes in recent weeks. Every quarter, a batch of different exchange-traded derivation contracts expires on the same day, which market watchers sometimes refer to as "Triple Witching Day" event. Experts predict that the event itself will not increase additional fluctuations on Friday but may pave the way for more sudden fluctuations in the stock market next week. (Jin10)