Quadruple Witching Day Expires Friday What exactly is Quadruple Witching Day? Why is it so important for Bitcoin? Quadruple Witching Day refers to the simultaneous expiration of four derivatives (stock index futures + options, individual stock futures + options). Quadruple Witching Day occurs four times a year and can cause significant volatility in the stock market as funds roll their positions. This volatility often spills over into Bitcoin ($BTC). The last two Quadruple Witching Days this year saw BTC prices fluctuate, consolidate, and then surge. We saw the same pattern in September 2021 (a year after the halving). Now, in September 2025—another year after the halving—the situation looks similar. If history repeats itself, Bitcoin will consolidate here before breaking out in October.