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Stocks plunge on the final trading day of October as AI reckoning grips Wall Street

US stocks plunged in the final trading day of the month as earnings from Amazon ( AMZN ) and Alphabet ( GOOG , GOOGL ) this week rekindled concerns about the amount of money Big Tech is spending on its AI ambitions. The Nasdaq Composite ( ^IXIC ) tumbled 2.8% as a tech-fueled sell-off intensified. The Dow Jones Industrial Average ( ^DJI ) fell 1.2%, or over 650 points, while the S&P 500 ( ^GSPC ) dropped 2%. For the month, the Dow gained 1.5%, while the Nasdaq and S&P 500 gave up gains, falling