AI chip stocks have been selling off all month. This week the rout went global. South Korea's Kospi triggered an automatic circuit breaker on Tuesday after falling more than 8%, with Samsung and SK Hynix, two of the world's biggest chipmakers, each losing roughly 9-11% of their market value intraday. The immediate trigger was a report from The Information, published Monday, that Shanghai Yuliangsheng Technology — a Chinese startup linked to Huawei and the SiCarrier equipment group — had begun mass-producing its own deep ultraviolet lithography machines, the specialized tools used to etch circuits onto chips. ASML, which has held a near-monopoly on those machines for decades, lost roughly €8 billion in market value in a single session. The broader selloff had already hit hundreds of billions of dollars across chipmakers since early July, when Micron dropped 13% in one session.

1. The Trade Isn't Over (Dan Ives, Wedbush Securities; Morgan Stanley; Goldman Sachs)

The selloff looks bad, but the underlying numbers still argue for AI chips.

Semiconductor earnings just grew 131%. FactSet reports that's the sector-wide figure for Q2 2026, and Nvidia alone posted $62.31 billion in data-center revenue last quarter — up 75% year-over-year. Those numbers reflect real revenue, not speculation.

The valuations aren't stretched the way they look. Goldman Sachs noted that Nvidia's forward price-to-earnings ratio is currently 21.7 — below its own five-year average of 72. Even Samsung, which fell hard on Tuesday, just reported operating profit up more than 1,800% year-over-year.

The people writing the biggest checks haven't blinked. Amazon, Microsoft, Alphabet, and Meta are together on track to spend roughly $725 billion on AI infrastructure in 2026 — up 77% from 2025. Dan Ives, managing director at Wedbush Securities, called this moment "the 3rd inning, 1 out in a 9-inning game." Morgan Stanley characterized the decline as "a mid-cycle reset rather than a top."

2. But the Bubble Warning Signs Are Real (Michael Hartnett, Bank of America; Mike Bailey, FBB Capital Partners)

The spending numbers are enormous — and they're starting to detach from what the technology can actually deliver.

Bank of America's bubble meter just hit dot-com levels. Michael Hartnett, Bank of America's chief investment strategist, flagged a Bubble Risk Indicator reading of 0.91 for the semiconductor sector — well above the broader Nasdaq 100's 0.69 — and drew a direct comparison to the conditions that preceded the June 2000 tech crash.

The free-cash-flow math is getting hard to ignore. Amazon is on track to burn more cash than it brings in this year, according to analysts, as it pours money into AI infrastructure. Morgan Stanley estimates the hyperscalers collectively will need to issue more than $400 billion in new debt to cover their 2026 spending plans. Mike Bailey, director of research at FBB Capital Partners, put it plainly: "Expectations are up, and fundamentals are struggling to meet these sky-high demands."

The run-up itself is part of the problem. The Philadelphia Semiconductor Index gained more than 130% over the prior 12 months, and the VanEck Semiconductor ETF gained 71% in Q2 2026 alone. When stocks rise that fast, the correction risk becomes structural — not just sentiment.

3. China Just Changed the Conversation, Though (The Information; TrendForce)

The China DUV story isn't about AI ROI — it's about whether Western chip export controls are working.

China started making the machines that print chips. Shanghai Yuliangsheng targets around 5 DUV systems shipped in 2026 and 20 in 2027, with SMIC, Hua Hong Semiconductor, and CXMT as first customers. SMIC has been trialing the machine since September 2025. That's still small — ASML ships hundreds per year — but it's the first time China has made commercial immersion DUV tools at all.

That growth trajectory spooked the market. Analysts compare Yuliangsheng's machine to an ASML system from 2008 — it's a generation behind in throughput and precision. But TrendForce has been tracking China's step-by-step lithography push since at least late 2025, and the market has underestimated each step. The MATCH Act, a bipartisan U.S. bill to block China from buying DUV machines, exists precisely because lawmakers already saw this coming.

ASML lost €8 billion in a single day. Investors now think its grip on lithography — the foundation of Western chip-export controls — may be weaker than they assumed.

Where This Lands

Ives and Morgan Stanley say the fundamentals haven't cracked — earnings grew 131% last quarter and hyperscalers are spending more, not less. Hartnett and Bailey say the spending itself is the problem: the sector's valuation just hit territory last seen before the dot-com collapse, and Amazon is burning cash. Either way, China's DUV push may make the valuation debate secondary. If Yuliangsheng's production scales, the West's export-control strategy has a hole in it — and that matters more than where chip stocks are trading.

Sources