AI Stocks Today (Dec. 18, 2025): Micron Ignites the AI Chip Rally as OpenAI Funding Talk and Data-Center Financing Fears Keep Wall Street on Edge
Micron shares jumped 13.5% to $255.95 by early afternoon Thursday after the company issued a strong profit outlook and highlighted high demand for AI memory chips. The Philadelphia SE Semiconductor Index rose about 3%. Nvidia, AMD, Microsoft, Alphabet, and Meta also posted gains. Softer U.S. inflation data further boosted sentiment, sending Treasury yields lower and supporting tech stocks.