Triple Witching Event This Friday Could Lead to Market Volatility
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Triple witching options event on Friday has historically caused stock market turbulence
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$4 trillion in derivatives contracts expiring could spur volatility and index rebalancing
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September triple witching weeks have seen S&P 500 falls 79% of time historically
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Traders watch dealers who buy/sell stocks to hedge options, shifting "gamma" exposure
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Investors optimistic on equities, may allocate more money in Q4 rally after cash buildup