Meta's new Muse AI agent set off a rally in semiconductor shares, and AMD crossed the $1 trillion market capitalization mark, Barron's reported on Monday, September 21, 2026.
Intel and other chipmakers climbed alongside AMD, according to Barron's. Yahoo Finance also reported gains in Intel, Arm and other AI chip stocks. Bloomberg reported that Korean semiconductor shares rose as enthusiasm over Muse spread.
The Muse agent's downloads have been climbing quickly, CNBC reported, which compared its traction with ChatGPT, Grok and Claude. Meta also released a dedicated Mac app for the assistant, according to Hypebeast.
The moves point to investor expectations that a widely used AI agent will lift demand for the processors that power it. AMD's trillion-dollar valuation places it among a small group of companies at that level.
What to watch next: whether Muse's download momentum holds and whether chip demand follows the stock reaction.
