Shares of the sector’s biggest AI‑linked chip makers fell sharply on Monday, 14 Sept 2026, after Anthropic chief executive Dario Amodei called for an industry‑wide slowdown in AI development over the weekend. By the New York close, Nvidia was down 3.3%, AMD slid 4%, Micron and Sandisk each fell 5%, and ASML dropped 6% on the Euronext Amsterdam exchange.
What triggered the sell‑off?
On 12 Sept 2026, Anthropic’s CEO Dario Amodei warned that “reckless” AI development could soon outpace societal controls. The appeal was covered by The Guardian, which noted that the call prompted a market‑wide reaction the following day.
Stock moves by the close
The Guardian’s market‑day recap recorded the following percentage declines, all measured "by market close on Monday, 14 Sept 2026":
| Company | Percentage Change | Exchange |
|---|---|---|
| Nvidia (NVDA) | -3.3% | Nasdaq |
| AMD (AMD) | -4% | Nasdaq |
| Micron Technology (MU) | -5% | Nasdaq |
| Sandisk (SNDK) | -5% | Nasdaq |
| ASML (ASML) | -6% | Euronext Amsterdam |
| Source: The Guardian, 14 Sept 2026 | ||
In addition, the tech‑heavy Nasdaq index fund was down 0.5% by the end of the day, SoftBank shares – a major backer of OpenAI – slumped 13%, the South Korean Kospi index fell 3%, and Taiwan Semiconductor Manufacturing Company (TSMC) shares dropped 1.2%.
Company snapshots
Nvidia (NASDAQ:NVDA) is headquartered in Santa Clara, California, and is led by Jensen Huang. The firm reported $177.8 bn of revenue and $118.0 bn of net income for the fiscal year ending 31 Jan 2027, according to its Form 10‑Q filed 26 Aug 2026 (SEC). It has 24.304 bn shares outstanding as of 25 Jan 2026.
Advanced Micro Devices (NASDAQ:AMD) is also based in the United States and trades on Nasdaq. Its most recent filing shows $3.913 bn of revenue for the quarter ending 30 Sep 2017 and a net income of $3.68 bn for the fiscal year 2026, filed 5 Aug 2026.
Micron Technology (NASDAQ:MU) is headquartered in Boise, Idaho. The company’s Form 10‑Q filed 25 Jun 2026 disclosed $47.268 bn of net income for the fiscal year ending 28 May 2026 and $134.112 bn of total assets.
Sandisk (NASDAQ:SNDK) is a subsidiary of Western Digital and trades on Nasdaq. The Guardian’s report groups its 5% decline with Micron’s, but no separate filing data are needed for the price move.
ASML Holding (Euronext:ASML) is a Dutch lithography equipment maker, Europe’s most valuable tech firm. Its 6% slide was recorded on the same day, again sourced from The Guardian.
Why the sector is sensitive
The semiconductor and equipment market is tightly linked to AI model training demand. When leading AI firms signal a slowdown, investors anticipate reduced orders for high‑performance GPUs, memory chips and lithography tools, prompting a rapid price correction. The 0.5% dip in the Nasdaq index underscores that the reaction was not limited to the five named stocks but spread across the broader tech market.
SoftBank’s 13% plunge reflects its exposure to OpenAI through a sizable equity stake, while the 3% drop in South Korea’s Kospi index shows the ripple effect on regional markets that host major memory manufacturers.
What remains unknown
The Guardian article does not disclose the exact timing of the appeal’s public release, nor does it provide forward‑looking guidance from the affected companies. Neither Nvidia nor AMD have issued statements on how the slowdown call will affect their product roadmaps or capital spending. Investors will be watching the next earnings releases – Nvidia’s fiscal year ends 31 Jan 2027 and AMD’s fiscal year ends 26 Dec 2026 – for any guidance on demand trends.
Looking ahead
If the AI‑slowdown appeal gains traction among regulators, the sector could see a longer‑term moderation in chip orders, especially for high‑end GPUs and memory modules used in large‑scale model training. Conversely, a quick resolution or a lack of policy action could see the stocks rebound, as the sell‑off may have been driven more by sentiment than by a material shift in demand.
For now, the market’s immediate reaction provides a clear data point: AI‑linked semiconductor and equipment stocks can move 3%‑6% in a single day when regulatory risk spikes. Traders and analysts will likely use this episode as a benchmark for future policy‑driven volatility in the AI supply chain.