Shares of Arm Holdings (Nasdaq: ARM), the British company that designs the processor architectures used in nearly all of the world’s smartphones, jumped 17.16% on Monday, closing at $322.90 and pushing the company’s market capitalization to roughly $345 billion — a gain estimated at about $49 billion in a single session.
Demand for the AGI CPU “tops $2 billion”
The move was triggered by comments from chief executive Rene Haas, who during the earnings call for the first quarter of fiscal 2027 (ended July 29, 2026) said customer demand for the company’s proprietary AGI CPU — a semi-custom processor built for AI infrastructure — represented an initial opportunity of $1 billion over the fiscal 2027-2028 period, with production capacity already secured through supply-chain partners.
«Demand for the Arm AGI CPU has continued to exceed our initial expectations», Haas said at the time. In the days that followed, in an interview picked up on September 16 by CNBC, the CEO said his confidence in beating that target — now set at $2 billion in total demand — «has grown over the past 90 days». It was this renewed confidence, combined with a wave of price-target revisions from analysts, that set off Monday’s rally.
Wall Street raises its estimates, but views are split
The stock’s run-up has been accompanied by a series of analyst moves over the past two weeks. Piper Sandler initiated coverage on September 10 with an Overweight rating and a $320 price target, forecasting IP licensing revenue of up to $12 billion by fiscal 2031 (roughly 20% annual growth) and AGI CPU chip revenue of up to $15 billion over the same period.
Raymond James raised its target on September 21 to $272 (Outperform rating), citing growth in server royalties and the company’s new “fabless” chip business, while calling the $15 billion 2031 revenue goal «too ambitious». Bernstein (September 15, Buy, $480 target) and Mizuho (August 26, Buy, $400 target) remain among the most bullish, while Morgan Stanley (September 18, Equal-weight) has a target of just $212 — implying more than 30% of downside from current levels. It’s an unusually wide spread of opinion for a stock of this size.
A new chip platform and speculation over a Meta tie-in
The rally comes roughly two weeks after the September 8 launch of the new Arm Neoverse CSS N4 platform, a semi-custom compute subsystem for data centers that supports up to 128 cores on TSMC’s N3P manufacturing process and is designed for next-generation AI infrastructure. Arm’s server architecture — of which the AGI CPU is only the latest iteration — has already been adopted or is under evaluation at major cloud operators including Oracle, Meta and ByteDance, and has drawn market speculation, not confirmed by any official announcement, about a possible link to Meta’s “Muse” AI-agent initiative.
Arm is not listed in Milan or anywhere else in Europe; investors there get indirect exposure mainly through SoftBank Group, which trades in Tokyo. According to market estimates, SoftBank controls about 87% of Arm’s capital after cumulative investments of roughly $40 billion in 2016 and 2023, meaning Arm’s swings tend to show up — often amplified — in the Japanese stock.
The risks to watch
The stock now trades at a price-to-earnings multiple above 270 times earnings (per Piper Sandler’s September 10 estimate, when shares were still at $264), and the average analyst target tracked by StockAnalysis.com — $288.71 across 43 analysts — remains about 10-11% below Monday’s closing price, a sign the broader analyst consensus has not yet fully caught up with the rally.
Editor’s note
This article was originally published in Italian on money.it by Money.it Research Office on September 22, 2026 as «Arm Holdings vola a +17%. Wall Street scommette sui chip su misura per l’AI agentica». It has been translated and adapted for an international audience by the Money.it International desk.
