Quadruple Witching Hits Stock Market, Sparking Bursts of TradingBookmarkJun 19 2020, 2:40 AMJun 19 2020, 10:39 PMJune 19 2020, 2:40 AMJune 19 2020, 10:39 PM(Bloomberg) -- Traders struggling to keep up with gyrations in U.S. stocks just got jolted by a surge of trading volume.Disclaimer