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AMD reaches a $1 trillion market cap as chip stocks drive rally

Sep 21, 2026, 6:42pm EDT
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AMD CEO Lisa Su
AMD CEO Lisa Su. Ann Wang/Reuters

AMD on Monday became the fourth US chipmaker to exceed a $1 trillion market cap, as traders piled into AI-related stocks.

The semiconductor rally came as key AMD customer Meta’s Muse AI assistant claimed the top spot among free downloads on Apple’s app store; Meta’s stock surged more than 11%, with the Nasdaq notching its first record-high close since June.

Semiconductor firms drove a broad advance as soaring AI-fueled demand for memory rippled across the globe: South Korea’s chip exports largely drove the country’s record early September exports, vindicating the Bank of Korea’s back-to-back interest rate hikes and bolstering the case for further tightening.

Chart of market capitalization across semiconductor industry leaders
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