$5.8 trillion Options expire on Friday, and the Triple Witching could trigger market Fluctuation.

It is estimated that $5.8 trillion in notional stock open interest will expire on Friday, June 20, including $4.2 trillion in index options, $708 billion in U.S. ETF options, and $819 billion in individual stock options. The event is likely to increase equity volatility beyond the relatively modest moves of recent weeks.

Each quarter, a batch of different exchange-traded derivative contracts expire on the same day, which market observers sometimes refer to as the “Triple Witching Day” event. Experts expect that the event itself will not increase additional fluctuations on Friday, but it may pave the way for more sudden fluctuations in the stock market next week.