Closing Time: The chip that broke the market
CNBC reports that Intel shares fell 29.2%, their worst day since the 1970s, after the chipmaker issued weaker-than-expected guidance tied to a plant shutdown in Israel and a soft PC market.
Good afternoon. One weak forecast from Intel turned a nervous week for AI stocks into a rout on Friday, and chipmakers took the worst of it. Here is what mattered today.
Intel shares fell 29.2%, their worst day since the 1970s, after the chipmaker issued weaker-than-expected guidance tied to a plant shutdown in Israel and a soft PC market, CNBC reports.
The selloff put the Nasdaq 100 on course to erase more than $1.5 trillion in value, and so-called neocloud stocks Nebius and CoreWeave each dropped about 11%, according to NBC News.
The Nasdaq slid to a three-month low as results from Intel and Amazon deepened worries about whether AI spending will pay off, Reuters, via Mint reports.
OpenAI says it will honor a shared signal in robots.txt that lets websites tell multiple AI companies at once whether their content can be used for training.
The chip that broke the market
For most of this year, Intel was the comeback story of the chip world. Its shares were up about 150% heading into Thursday’s report, lifted by demand for the central processors that AI agents lean on, CNBC notes. On Friday that story cracked, and the stock closed down 29.2%.
The problem was the forecast. Intel expects adjusted earnings of 25 cents a share this quarter on revenue of $15 billion to $16 billion, while analysts had been looking for 43 cents and $17.1 billion. Finance chief David Zinsner said he sees the PC slowdown lasting at least through the first half of next year, and an explosion at an Intel plant in Israel earlier this month, which killed two workers, will cost about $600 million in lost revenue over two quarters.
Chief executive Lip-Bu Tan said he was disappointed Intel could not meet strong customer demand, pointing to manufacturing problems, supply shortages and what he called an unprecedented memory crunch that is hurting PC sales, as NBC News reports. Soaring memory prices make every computer more expensive to build, and buyers are pulling back.
The damage spread well beyond Intel. The Philadelphia semiconductor index fell 9.1%, with AMD, Qualcomm, Arm and Sandisk all posting double-digit losses, and Nvidia gave up 5.0%. Investor’s Business Daily tied the slide directly to Intel’s warning. The U.S. government’s 10% stake in Intel lost about $12 billion in value on the day, and Nvidia’s stake shed about $6 billion, according to CNBC.
The bigger reason the drop hurt so much is timing. Alphabet had its worst day on record on Thursday over its cash burn, and Amazon’s report kept its $220 billion spending plan while free cash flow stayed negative. Investors are now asking every AI company the same question: when does all this spending start paying for itself?
Intel still has an answer it hopes will land. Tan says a couple of outside customers for its new chip factories will be ready to announce over the next two quarters. Until they do, the market has made clear it will not pay for promises alone.
Elsewhere in AI today
Website owners may soon need only one line to opt out of AI training. OpenAI says it will honor a common robots.txt signal developed through an internet standards working group, so publishers no longer have to write separate rules for each AI company’s crawler. OpenAI plans to put the signal in place over the coming months and says its existing crawler controls will keep working.
OpenAI is also tightening how ChatGPT handles violence. The company says ChatGPT will give less detail about past mass attacks and the people behind them, including the weapons used, no matter the user’s age, and it will publish its first Community Safety Report in early 2027, with updates every six months.
The cartoon faces on new AI assistants are drawing scrutiny. Meta’s Muse agent defaults to a furry character named Jolly, and OpenAI’s Dots use soft, colorful shapes, which critics worry will appeal to children, Bloomberg Law reports. Meta says Muse has passed 7 million downloads and that it blocks people it detects may be under 18.
Markets
Chip stocks led a broad tech selloff on Friday after Intel’s forecast. The Nasdaq fell 2.8%, the S&P 500 dropped 2.0% and the Dow lost 1.1%. The Philadelphia semiconductor index sank 9.1%. Of the 86 AI and tech stocks we track, only 3 closed higher.
The few gainers came from software and consulting. Accenture rose 4.7%, Intuit added 3.1% and Adobe gained 1.1%.
Chips and the parts that go into them filled the losers list. Intel plunged 29.2% and memory maker Sandisk fell 15.3%. Optical parts maker Coherent dropped 13.5%, chip equipment maker Axcelis slid 12.8% and AMD lost 12.2%.
Biggest winners
Biggest losers
| Ticker | Name | Price | Day |
|---|---|---|---|
| INTC | Intel | 65.17 | -29.22% |
| SNDK | Sandisk | 1,126.54 | -15.30% |
| COHR | Coherent | 205.18 | -13.50% |
| ACLS | Axcelis | 97.69 | -12.79% |
| AMD | AMD | 497.52 | -12.16% |
Prices are Friday’s U.S. closing prices, October 30, 2026, versus Thursday’s close. Market data is a snapshot, not live.
Watch
Y Combinator — What Happens When Everyone Can Build Software
On YC’s Lightcone podcast, the hosts sit down with Paul Copplestone, the co-founder and chief executive of Supabase, the database company that has grown to 13 million users and more than 50 million databases since it joined YC in 2020.
Copplestone explains how Supabase is preparing for a world where everyone writes their own software, billions of people have personal databases, and AI agents do much of the building.
Watch this for a builder’s view of where software demand is heading, even on a day when Wall Street lost its nerve about AI.
The AI Daily Brief — New Leading AI Models as Benchmarks Shift
Host Nathaniel Whittemore walks through the fifth version of the Artificial Analysis Intelligence Index, a popular scorecard that ranks AI models, and how its new tests reshuffled the leaderboard.
He explains why private test data and agent-style tasks make the rankings harder to game, and why the new results show a wider gap between top U.S. models and open-weight ones.
Watch this if you want to know which models actually lead right now and why the scores moved.
The AI Advantage — ChatGPT & Grok Bot: 7 Useful Updates for Everyday Life
This episode of The AI Advantage shows how to use ChatGPT and Grok Bot to handle everyday admin, connect your apps and get things done from your phone.
It covers the latest updates, including ChatGPT’s Dots and its iCloud connection, and is honest about what works well and what still needs improving.
Watch this for practical, hands-on ideas you can try with the assistants you already have.