币界网报道:On June 20, Citi estimated that $5.8 trillion in notional equity open interest would expire on Friday, including $4.2 trillion in index options, $708 billion in U.S. ETF options and $819 billion in individual stock options. The event could add to stock market volatility beyond the relatively mild moves seen in recent weeks. Every quarter, a group of different exchange-traded derivatives contracts expire on the same day, an event sometimes referred to by market watchers as "triple witching." Experts don't expect the event itself to add additional volatility on Friday, but it could open the way for more sudden moves in stocks next week.