The Nasdaq Composite surged to a record closing high on September 21, 2026, as a powerful rally in semiconductor and artificial-intelligence stocks revived investor enthusiasm across Wall Street. The technology-heavy index jumped 2.26% to 27,122.09, gaining nearly 600 points and posting its first record close since June 2, while the S&P 500 advanced 1.49% and the Dow Jones Industrial Average gained 0.71%. Semiconductor shares were among the strongest performers, with the PHLX Semiconductor Index rising 4.3%, while Intel climbed about 12.2% and Arm Holdings surged 17%. AMD became a major focus of the session after its shares gained roughly 10% and the company crossed the $1 trillion market-capitalization threshold for the first time, joining Nvidia, Broadcom and Micron among U.S. chipmakers to have reached that milestone. Nvidia also advanced 2.3%, while other technology and AI-linked companies participated in the broader rally. Investor sentiment was additionally supported by falling crude-oil prices and a retreat in the benchmark 10-year U.S. Treasury yield, which eased some of the pressure that higher energy costs and borrowing rates had recently placed on growth stocks. Despite the record Nasdaq close, market conditions remain sensitive to interest rates, inflation, geopolitical developments and the enormous capital spending required to support the global AI boom, meaning investors will continue watching semiconductor earnings and AI infrastructure demand closely for evidence that the sector's rapid growth can be sustained.
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