Meta Jumps 11% as Muse AI Agent Demand Lifts Chip Stocks

Bloomberg·21 Sep 2026·

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Summary · why it matters

Meta Platforms surged 11% in its biggest one-day gain since April 2025, as excitement over its Muse AI agent reignited demand for the chips needed to run inference workloads. Intel rose 12% and Advanced Micro Devices climbed almost 10%, with AMD entering the $1 trillion market cap club on the move. The broader market closed higher, with the Dow Jones industrial average adding roughly 370 points, or about 0.7%, to close above 52,000, the S&P 500 up more than 100 points, or 1.5%, and the Nasdaq composite up 2.2%. Warner Brothers Discovery jumped almost 11% after Paramount moved into settlement talks with California officials and other states suing to block its planned acquisition of the company, a deal that would pave the way for one of the largest mergers in Hollywood history. Critical Metals soared about 38% after President Trump said he reached an agreement with Denmark over Greenland that would give the US permanent control over security of the Arctic island. On the losing side, CF Industries fell 3.5% as the president said the US is working on a Belarus potash deal, UPS dropped 4.4% after Bank of America cut its price target and 2026 estimates on declining domestic volumes, and Novo Nordisk ADRs fell about 8% as investors were disappointed by the drugmaker's turnaround plans.

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