The most valuable company in the world changed hands on Monday — and the reason says everything about where the AI trade’s anxieties now live.
Nvidia tumbled 4.99% to close at $196.51, its steepest single-day drop since early June, ceding its title as the world’s most valuable public company to Apple, which rose more than 1% to a market capitalization near $4.95 trillion. The catalyst was a return of “circular financing” fears, and the sell-off rippled across the entire semiconductor complex, compounded by a separate shock out of China that hammered chip-equipment makers. Yet a pullback in oil, driven by a pause in US strikes on Iran and a pivot toward diplomacy, cushioned the broader market and kept the damage contained to the chip sector.
Index Performance
Nvidia and the “Circular Financing” Problem
The trigger was a Wall Street Journal report that Nvidia is in talks to backstop up to $250 billion in financing for OpenAI’s long-term lease of a 10-gigawatt data center being built in Ohio by SoftBank subsidiary SB Energy. The arrangement — in which Nvidia’s loan guarantees would help secure better debt terms, while the facility would be filled with Nvidia chips — crystallized a concern that has been building all year: the increasingly circular structure of AI deals, where the dominant chip supplier also invests in, or guarantees the debt of, its largest customers.
Bloomberg reported that Nvidia has already announced more than $540 billion of such deals in 2026 alone, excluding this potential new OpenAI arrangement. The market’s unease was visible in the credit market as much as the equity market: Nvidia’s five-year credit default swap surged to a record 82 basis points, its largest single-day intraday gain since the contract began actively trading in late 2025. Both the IMF and the Bank for International Settlements have flagged AI circular financing as a systemic downside risk in recent reports, lending institutional weight to what might otherwise be dismissed as a bearish talking point.
The mechanism at the heart of the worry is straightforward. When a supplier finances its own customers’ purchases, apparent demand can be inflated — and the model only holds so long as AI revenue growth continues to outpace the debt being layered on to fund it. CoreWeave is the archetype: Nvidia took a strategic stake, CoreWeave bought Nvidia chips to build data centers, and the resulting debt load traces back to the same supplier that spawned it. The sell-off spread to AMD, which fell more than 5%, while memory names Micron and SK Hynix dropped around 2% and 6%, respectively.
China’s DUV Breakthrough Slams ASML
The second blow landed on the chip-equipment group. According to a report from The Information, a Shanghai-based, state-backed company has begun mass-producing immersion deep-ultraviolet (DUV) lithography machines — the tool category long dominated by ASML and considered one of the last remaining chokepoints in conventional memory and logic production.
ASML erased early gains and fell more than 6%, touching its lowest level since early June, with US peers Applied Materials, Lam Research, and KLA sliding in sympathy as investors weighed the prospect of Chinese chipmakers gradually shifting procurement to domestic suppliers. The immersion DUV systems operate at a 193-nanometer wavelength and are expected to be delivered to China’s largest manufacturers, including SMIC and CXMT.
The caveats, however, are substantial. Early production volumes remain modest — roughly five machines expected in 2026 and around twenty more in 2027 — against ASML’s planned capacity of about 130 immersion systems this year. Analysts at SemiAnalysis cautioned that tool performance, production scaling, fleet reliability, and the surrounding ecosystem of masks, chemicals, and metrology all stack up against China’s effort, with scaling the machine’s own production being “the most underestimated part.” China accounted for just 14% of ASML’s net system sales last quarter, and export restrictions already bar the company from selling some immersion tools there. The threat is real but long-dated — a repricing of the total addressable market a decade out, not a near-term earnings hit.
CXMT’s Blockbuster Shanghai Debut
Compounding the mood in memory, China’s largest DRAM producer made a splashy market debut. ChangXin Memory Technologies (CXMT) listed on the Shanghai STAR Market on Monday in an $8.6 billion IPO — and rather than reassuring investors, the sheer scale of the listing stoked fears of future DRAM oversupply, adding pressure to Micron, Samsung, and SK Hynix.
Here too, the fundamentals argue for perspective. As of mid-2026, only about 2% of CXMT’s wafer capacity is allocated to HBM, and its roadmap targets mass production of HBM3E — a full generation behind the HBM4 that SK Hynix and Samsung are already shipping — no earlier than 2027. The competitive threat is a conventional-DRAM story for now, not a challenge at the high-bandwidth frontier where the AI margins actually sit.
Oil Retreats, Cushioning the Broader Market
The one clear positive came from the commodity pits. Oil prices fell as the United States paused its strikes on Iran and signaled a pivot toward diplomatic dialogue, easing the geopolitical premium that had driven crude sharply higher the previous week. The decline in energy costs offered a counterweight to the semiconductor-led selling, helping the broad market absorb the chip weakness without a wider risk-off cascade.
The divergence was the story of the day: a targeted unwind in the most crowded, most financially entangled AI names, set against a macro backdrop that was quietly improving as the war premium bled out of oil.
Bottom Line
Monday marked a symbolic passing of the torch — Apple reclaiming the market-cap crown from Nvidia — but the substance beneath it matters more than the symbolism. The two blows that hit the chip sector, circular-financing anxiety and China’s DUV breakthrough, are both fundamentally about the same question that has dominated the market for a month: is the AI buildout as durable and as clean as its valuations assume? Neither concern is fatal on its own — the OpenAI financing is unconfirmed, and China’s lithography effort is years from scale — but together they gave a nervous market fresh reasons to sell the names that had led the entire rally.
With Microsoft, Amazon, and Meta all reporting later this week, and their capex plans certain to draw intense scrutiny after Alphabet’s sell-off, the market’s tolerance for AI spending is about to be tested again — this time with the added overhang of wondering who, exactly, is financing all of it.
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