U.S. stocks set for wild swings as trillions in options contracts set to expire Friday

U.S. stocks could see increasingly wild swings in the coming days as option contracts tied to trillions of dollars in securities are set to expire on Friday, removing a buffer that some say has helped to keep the S&P 500 index from breaking out of a tight trading range.

Option contracts worth $2.8 trillion are set to expire during Friday’s “quadruple witching” event, according to figures from Goldman Sachs Group GS.