US Stocks End Week Lower on Fears of Another ‘DeepSeek Mo…

US stocks closed the week lower, primarily due to a decline in semiconductor shares following the announcement of an AI model by a Chinese startup. The Nasdaq 100 Index fell 1.5%, marking its worst weekly performance in nearly a month, with Meta Platforms Inc. contributing significantly to the downturn. The Philadelphia Stock Exchange Semiconductor Index also dropped by 1.6%, reaching a total decline of 20% since its June peak, thereby entering bear market territory.

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By Joel Leon

July 17, 2026 at 8:13 AM UTC

Updated on July 17, 2026 at 8:28 PM UTC

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US stocks finished the week lower as semiconductor names dipped following the reveal of an artificial-intelligence model from a Chinese startup.

The tech-heavy Nasdaq 100 Index closed down 1.5%, finishing its worst week in almost a month. Meta Platforms Inc. led the Magnificent Seven cohort lower. The Philadelphia Stock Exchange Semiconductor Index fell 1.6%, widening its drop from a June record to 20%, which meets a definition of a bear market.

Read Original at Bloomberg.com →

US Stocks End Week Lower on Fears of Another ‘DeepSeek Moment’