The Philadelphia Semiconductor Index (SOX) has fallen to its lowest level relative to the S&P 500 since April 2026, with the ratio dropping to 1.45 and a 24% decline from its mid-June peak. The index logged eight consecutive losing sessions, its longest streak since October 2008, shedding approximately 16% during that period. On October 16, 2026, the index closed at 11,137.29, with all 30 components finishing lower and major names like Broadcom, Micron, AMD, Intel, Lam Research, and KLA down about 5%. This correction has erased more than $1 trillion in market value across semiconductor and AI-linked companies.
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