Stock Market Today, Sept. 21: Meta Surges on Excitement Over Muse Personal AI Agent

Global AI trade roars back as Meta’s personal agent fuels optimism

Global AI stocks and chipmakers rallied following the strong debut of Meta's Muse AI agent. The surge boosted semiconductor shares like Samsung, SK Hynix, and MediaTek. Easing geopolitical tensions and lower oil prices further lifted market sentiment across Asian markets and US tech stocks. Shortest Generic

AI trade roars back as Meta’s personal agent fuels optimism

The rally followed Meta’s Muse AI agent climbing to the top of Apple’s free-app rankings shortly after its launch earlier this month

Stock Market Today, Sept. 21: Meta Surges on Excitement Over Muse Personal AI Agent

Wells Fargo's AI-driven upgrade reinforced investor confidence as Muse AI agent gained early traction on app stores, today, Sept. 21, 2026.