Key Highlights

  • Semiconductors fell more than 4% on the week ending October 9, 2026, and a semiconductor index dropped as much as 3.4% on the OpenAI revenue report, making chips the weakest part of the market.
  • Nvidia (NASDAQ:NVDA) is quoted near USD 229 despite reportedly guiding to USD 108 billion of October-quarter revenue and 89% growth, figures from one weekly report that should be verified against its last company release.
  • iShares Semiconductor ETF (NASDAQ:SOXX) holds many of the largest chip designers and makers, so the weekly decline reflects the group and not a single company, though no fund price move is cited here.
  • Advanced Micro Devices (NASDAQ:AMD) also sits in the AI chip group, and investors are weighing the OpenAI revenue clarification as a read-through for demand for its accelerators.

The Weakest Group in the Market

Chip stocks lost more than 4% over the week of October 5 to 9, 2026, while the S&P 500 finished higher. The semiconductor index fell as much as 3.4% during the session when OpenAI's revenue was questioned, then partly stabilized after the company clarified that its annualized revenue was USD 50 billion. iShares Semiconductor ETF (NASDAQ:SOXX) is built around such an index, so it reflects the sector's swings. Money appeared to rotate from chips toward software and cybersecurity names on Friday. That rotation matters because chips had led the market for a long stretch, and a leader that lags can weigh on index-level sentiment and on investors who hold concentrated technology positions.

Big Guidance Versus Nervous Buyers

Nvidia (NASDAQ:NVDA) reportedly guided to USD 108 billion of revenue for the October quarter, with growth of 89%. Those numbers come from one weekly report, and they should be checked against the company's last release before anyone relies on them. Even if accurate, guidance does not remove the question of who pays for the chips. OpenAI is a private customer whose spending shapes expectations across the group, and doubts about its funding reach every supplier. Advanced Micro Devices (NASDAQ:AMD) competes in the same accelerator market and shares that sensitivity. Strong forecasts can coexist with falling prices when investors fear that demand growth may slow from very high levels.

Risks and Upcoming Tests

The main risk is that the AI spending cycle proves less durable than guided figures imply. Higher Treasury yields near 5.35% raise the cost of financing data centers and reduce what investors will pay for long-dated growth. Supplier earnings offer the next evidence, including ASML on Wednesday, October 14, and Taiwan Semiconductor Manufacturing on Thursday, October 15, per the published earnings calendar. Inflation data on October 14 and the Federal Reserve meeting on October 27 and 28 could shift the mood. Holders of iShares Semiconductor ETF (NASDAQ:SOXX) should note that it is concentrated in a cyclical industry, and past leadership gives no assurance about future returns.

Where Things Stand

Chips are the weakest part of the market because investors are questioning whether AI customers can keep funding huge orders, even as suppliers report or guide to record sales. iShares Semiconductor ETF (NASDAQ:SOXX) reflects the whole group, so it carries both the upside of AI demand and the pressure of the recent fall. Nvidia's USD 108 billion figure is reported and unverified. ASML on October 14 and Taiwan Semiconductor Manufacturing on October 15 are the next clear tests of demand.