Why is Arm Holdings stock sliding today?

Investing.com -- Arm Holdings ADR stock slid 7.25% in morning trading today, hitting $220.10, after the company’s fiscal Q4 2026 earnings call revealed that management had not secured the manufacturing capacity needed to meet demand beyond the initial $1 billion tranche of orders for its newly launched AGI CPU chip. Arm delivered quarterly results and guidance that beat expectations and touted strong demand for its new AI data center chip, but shares soared as much as 13% after-hours before reversing to fall over 6% after executives disclosed the company had not secured the necessary supply to meet an additional $1 billion in demand for its new AGI CPU. CEO Rene Haas and CFO Jason Child noted in their shareholder letter that customer demand had more than doubled to over $2 billion, but management clarified on the call that supply commitments had only been secured for the first $1 billion, adding, "For the $2 billion [of demand] we are now in the process of securing supply to support that."

For fiscal Q4 2026, Arm posted adjusted earnings of 60 cents per share on revenue of $1.49 billion, beating analyst expectations of 58 cents per share and revenue of $1.47 billion, with licensing revenue climbing 29% year-over-year to $819 million, while royalty revenue increased 11% to $671 million. However, management also predicted slightly negative numbers in smartphones during the call, and a shortage of memory chips has weighed on smartphone sales — a segment where Arm powers most devices globally. Raymond James analyst Simon Leopold wrote in a note that "supply constraints led management to withhold raising its revenue forecast," reinforcing investor caution around the stock’s near-term revenue trajectory. Analysts had also flagged a highly stretched technical condition and a very expensive valuation at a P/E of approximately 130, with rising operating expenses as additional watchpoints.

Arm Holdings tumbled on Thursday on investor worries about the company’s ability to secure sufficient supplies for its new AI chip to meet demand, with U.S.-listed shares falling in premarket trading after executives said late Wednesday they had not secured enough supplies to meet demand for the new chip. The broader market offered little offset, with the S&P 500 essentially flat at -0.05%, the Dow Jones down -0.04%, and the NASDAQ marginally higher at +0.11% — a stark contrast to the prior session’s record-setting rally driven by AI earnings and U.S.-Iran peace hopes. Taiwan Semiconductor had also recently sold its Arm Holdings stake, yet ARM stock had held firm as Wall Street kept betting on AI, data centers, and fresh chip ambitions — a dynamic that left the stock exposed once execution risk emerged.

Investors are now likely to focus on how Arm manages the reported supply constraints and turns the more than $2 billion in chip demand into sustained revenue, with the company’s ability to balance smartphone softness with newer AI-driven streams central to the story from here. While CEO Rene Haas revealed that customer demand for the AGI CPU doubled to over $20 billion within six weeks of launch, the company maintained a conservative $10 billion revenue outlook due to supply chain bottlenecks, and Haas predicted Arm will hold the largest CPU market share by 2030. The combination of a supply-constrained near-term outlook, a royalty revenue miss, and a stretched valuation converged to drive today’s sharp decline despite the headline earnings beat.

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