A $4.5 Trillion Triple-Witching Gives Investors Yet Another Test

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US stocks’ rebound off of last week’s lows will face a new test on Friday, when a pile of options contracts are set to expire in a quarterly event that often stoked volatility in the past.

The so-called “triple-witching” will see about $4.5 trillion of contracts tied to stocks, indexes and exchange-traded funds mature, estimates compiled by Citigroup Inc. show.