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Wall Street is looking to an 800-year-old mathematical concept to make a forecast based on the 50 percent Fibonacci retracement level of where the ongoing changes in the S&P 500 correction may pull back to.

This is a tool that is based on the 13th-century Leonardo Fibonacci sequence, which indicates that the index may wipe off all the profits achieved between the lows of April 2025 and the records of January 2026 and bottom out. The critical level is approximately 5,980, which is approximately 9 percent lower than the current closing levels and is associated with the mid-June low.

Fibonacci retracements are commonly used by chart watchers to determine favorable buying points during pullbacks since Fibonacci levels are commonly used as psychological support areas where the selling pressure might be reduced. The 50% retracement is not a guarantee, but the 50 percent retracement has in the past attracted interest when the market was going on a rampage.

With the S&P 500 enduring four consecutive weeks of losses against the backdrop of greater uncertainties, the ratio will be keenly watched by most investors to see when the downward spiral may come to an end and allow the index to begin to stabilize or recover.