U.S. AI names rallied together on September 21st, pushing the Nasdaq Composite to another record close. AMD rose nearly 10% to an all-time high, taking its market cap above $1 trillion for the first time, while Arm Holdings and Intel gained more than 17% and 12% respectively.
The composition of this move is worth noting: the leaders were CPU-related names rather than GPUs, reflecting a market starting to trade inference compute and server CPU demand driven by AI agents — a different thread from the training-compute narrative that dominated earlier. The catalysts came from the application layer, with Meta's Muse topping the U.S. App Store free chart and OpenAI reportedly building new features to counter Grok Bot while discussing a personal AI assistant of its own.
Two drivers should be separated here, though. Alongside the agent narrative, falling oil prices and Treasury yields are also at work — and that second factor eases valuation pressure across the entire tech complex, making it macro rather than AI fundamentals. If the rate environment turns, that support is the first part to go.
Do you see agents becoming AI's killer application? Does inference compute or the application layer look more attractive?
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