- Quadruple Witching. Investopedia. [2021-03-19]. （原始內容存檔於2021-06-18）.
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This daylong event, which is sometimes referred to as 「Freaky Friday,」 is an important day for short-term investors because the markets tend to be turbulent and unpredictable, shifting erratically as traders attempt to offset their orders before the closing bell rings.