U.S. stocks closed October with sharp losses as disappointing earnings from Amazon AMZN and Alphabet GOOG, GOOGL reignited concerns over the mounting costs of Big Tech's artificial intelligence (AI) investments and the potential returns on such massive spending (read: Top ETF Stories of October). Nasdaq Suffers Its Worst Monthly Performance Since March 2025 Despite the Dow's resilience, October proved challenging for the broader market. The Dow advanced 1.5% for the month, but the Nasdaq Composite and S&P 500 lost 5.2% and 1.2%, respectively. The Nasdaq recorded its steepest monthly decline since March 2025, as quoted on Yahoo Finance.
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