Why Is the Stock Market Down? AI Spending, Oil and a Crypto Hack

Alphabet lost $482 billion on Thursday, Intel had its worst day since 1974 on Friday and Reddit fell as much as 30%, while hackers linked to North Korea walked off with $6.3 billion from Binance in between, so for two days the US stock market traded more like a meme coin than the safest market in the world.

Most of it traces back to a question investors had been happy to ignore for two years, which is who is paying for all this AI and when the money comes back.

Quick Answer

Several pressures hit the market in the same week, starting with Big Tech's AI spending, which has begun eating into cash at Alphabet and Amazon, and Google's AI answers, which are cutting traffic to the rest of the web and sank Reddit. Expensive memory chips are killing PC sales, which dragged down Intel, Dell and the chip sector, while the US-Iran war has pushed Brent crude above $110, inflation is back at 3.7% and Fed officials are talking about raising rates, and Binance's record hack hit crypto at the same time.

By the close on Friday, October 30, about $1.8 trillion had been wiped from US stocks in a single day, with the Nasdaq down roughly 3.3%, the S&P 500 about 2.1% and the Dow about 1.3%. All moves in the table are from Friday apart from Alphabet's fall on Thursday.

Big Tech's AI Spending Is Burning Through Cash

Back in July, Alphabet fell 7% even after record earnings, and this quarter went much further, with revenue up 25% to $127.6 billion and Google Cloud more than doubling to $30.7 billion while earnings per share came in at $2.12 against the $3.02 analysts expected. Part of that gap was an $8.2 billion paper loss on Alphabet's SpaceX stake, and the rest is the classic difference between revenue and profit: the company spent $51.4 billion on infrastructure in a single quarter, kept its 2026 budget at $195 billion to $205 billion and promised more in 2027. Cash flow turned negative for only the second time since Alphabet listed in 2004, and the stock fell 12%, the worst day in its history.

Amazon told a similar story a day later, with free cash flow over the past 12 months sinking past minus $42 billion, a record outflow, on about $77 billion of property and equipment spending in one quarter. Investors cheered these budgets for two years, and this week they started asking when the money comes back.

The scale is hard to picture until you see J.P. Morgan's estimate that this year's AI spending by Amazon, Alphabet, Meta, Oracle and Microsoft roughly matches everything they spent since ChatGPT launched in November 2022. Meta is planning a record $97.5 billion raise and Microsoft is reportedly lining up a $25 billion bond sale, and Nvidia, which sells them the chips, fell about 5% on worries that they will overspend now and pull back in 2027.

Google's AI Search Is Cutting Traffic to Reddit and Other Sites

Reddit beat its third-quarter forecasts and still fell as much as 30%, heading for its worst day as a public company, because of a soft outlook and one blunt line from CEO Steve Huffman about Google's AI Mode: "AI Mode does not drive traffic. Not for us, and not to anybody as far as I know." Reddit lost more than a million Google search referrals a week in October, and it is moving more of its forums behind a login.

That line connects straight back to Alphabet, whose search ad sales came in at $63.35 billion against the $64.85 billion investors expected. Google admits AI Mode searches currently earn less than normal ones, because when the answer sits on Google's own page, nobody clicks through to Reddit, a news site or a shop, and fewer people see the ads that used to sit beside those links. Every publisher on the open web is watching that number, and so are we, which is why we looked at how sites can opt out of AI Overviews and AI Mode without leaving normal search.

Expensive Memory Chips Hit Intel, Dell and Other PC Stocks

Intel's fourth-quarter forecast fell short, and the stock dropped about 30.5% on Friday after CEO Lip-Bu Tan said PC buyers are refusing to pay the higher prices that expensive memory chips have pushed onto laptops and desktops, with a factory accident in Israel making a bad day worse. Intel now expects PC sales to fall about 12% this year and another 10% in 2027, and it says the slump will last "until memory availability and prices begin to normalize."

AI data centres have soaked up memory supply for months, and Gartner says DRAM costs rose about fivefold over the year to the second quarter, while worldwide PC shipments fell 22.4% in the third quarter. That cost has now reached the person buying a laptop, who looked at the price tag and walked away. Dell fell about 11.8% and HP almost 10% on Intel's warning. Arm dropped about 12.7% and AMD about 12.1% as the whole chip sector sold off, and Sandisk lost about 15% even after beating its forecasts, because investors now suspect memory prices are near their peak. If the chip names blur together, our guide to computer processors explains who makes what.

The Iran War Pushed Oil Above $110 and Inflation Up

Away from tech, tanker attacks and mine strikes in the Strait of Hormuz pushed Brent crude above $110 a barrel on Friday, leaving it up roughly 12% in October with no clear end to the US-Iran war. President Trump said the war is "going to end soon" without giving details, while reports suggest US strikes could resume after next week's midterm elections.

The oil price shows up everywhere else, with consumer prices up 3.7% in the year to September, gasoline up 34.2% and PCE, the Fed's preferred gauge, climbing to 3.6%. The Fed held rates this week in a split vote, and St. Louis Fed President Alberto Musalem and Richmond Fed President Tom Barkin have both signalled that rates may need to rise, which is about the last thing a nervous market wants to hear.

Binance Lost $6.3 Billion in a Hack

Crypto took its own hit when Binance revealed that hackers had drained about $6.3 billion, the largest crypto theft on record, which blockchain analysts at TRM Labs and Elliptic have linked to North Korea. Around $3 billion has been frozen with help from Tether and Circle, and Binance says it will cover customer losses and expects withdrawals to resume by Sunday.

Bitcoin fell about 5% to roughly $76,000, and crypto-linked stocks such as Coinbase, Robinhood and Strategy slid with it. If this week has you checking where your own coins sit, our guide on how to tell if a crypto platform is legit covers what to look at before you send money anywhere.

Roblox and Illumina Fell for Their Own Reasons

Roblox and Illumina fell for reasons that had nothing to do with AI. Roblox dropped about 20% after daily users fell 9% from a year ago to 138 million, well short of forecasts, and it guided holiday bookings down 10% to 15%, partly blaming the November 19 launch of Grand Theft Auto VI. Illumina lost about 19% after results showed the damage from being placed on China's Unreliable Entities List, even though it beat profit forecasts and raised its full-year guidance.

Why Prices Still Feel High at the Supermarket

Officially, grocery inflation has cooled, with food at home up 1.8% over the year, the smallest rise of 2026, but an annual figure only compares this year with last year and does nothing to undo the price jumps of the years before. It also sits beside gasoline up a third and laptop buyers who have simply stopped buying.

In the supermarkets we walk into, older shoppers count every coin at the till, and that says more about how this year feels than any monthly index. When everyday life is this tight, it gets harder to believe that a few companies spending around $200 billion a year each on data centres will turn it all into profit on schedule. If your own budget feels the squeeze, we tested the best free budgeting apps for people who hate budgeting.

Is the AI Bubble Bursting?

The answer depends on which half of the quarter you believe, because Google Cloud grew 103% with a $561 billion backlog of signed work, and JPMorgan Asset Management's John Bilton says "we have an insatiable and growing demand for data," so the demand behind AI is very real.

The trouble is the cost of building for that demand, which is running ahead of the revenue it brings in and turning cash flow negative at the biggest companies, while SpaceX has lost more than $400 billion since its October 6 peak as a lockup released about 1.3 billion shares. Much of the money also travels in circles, as we explained in how AI circular financing works and in Nvidia's possible $250 billion guarantee for OpenAI. Taken together, that looks like a correction in the most crowded trade on the market.

Our Take

This week the market started pricing AI as a bill that has to be paid, after two years of pricing it on promise. The technology is real, the demand is real and the companies building it are not going anywhere, but investors paid for years of profit in advance, and this quarter showed how long that payback could take. We said in September that AI valuations look like a bubble even though the products are useful, and nothing this week changed our mind. While that resets, Google's AI answers are quietly cutting off the traffic that feeds the rest of the web, and expensive memory is pricing ordinary people out of a new laptop.

We would not be surprised if the selling has further to run, because the things that started it are all still in place: oil above $110, inflation heading the wrong way and spending plans for 2027 that are bigger, not smaller. Anyone who tells you exactly where it stops is guessing, including the people on TV who sound most certain, and there is an old internet rule about doing the opposite of whatever Jim Cramer says that weeks like this keep alive.

What to Watch Next Week

• The US midterm elections on Tuesday, November 3, and whether strikes on Iran resume afterwards.
• Brent crude, and whether it stays above $110.
• Fed speakers and the next inflation data ahead of the December meeting.
• Binance, and whether withdrawals reopen on Sunday as promised.
• Big Tech guidance, for any sign that the 2027 spending plans are being trimmed.

FAQ

Why is the stock market down today?

Weak earnings and guidance from Intel, Reddit and Amazon added to fears that Big Tech's AI spending will not pay back soon, while expensive memory chips hit PC makers and the chip sector. On top of that, oil is above $110 because of the US-Iran war, inflation is rising and a $6.3 billion Binance hack hit crypto.

Why did Alphabet stock fall 12%?

Earnings per share missed estimates by about 30%, cash flow turned negative on $51.4 billion of quarterly AI spending, and search ad revenue came in below forecasts as AI Mode searches earn less than normal ones.

Why did Reddit stock crash?

Reddit gave a soft outlook after losing more than a million Google search referrals a week in October, and CEO Steve Huffman said Google's AI Mode does not drive traffic to anybody.

Why did Intel and Dell stock drop so much?

Intel's fourth-quarter forecast missed because PC buyers are refusing prices pushed up by expensive memory chips, and it now expects PC sales to fall about 12% this year and 10% in 2027. Dell fell about 11.8% on that warning, and Intel had its worst day since 1974.

Is the AI bubble bursting?

AI demand is real, with Google Cloud up 103%, but spending is running ahead of the money it brings back and investors have started punishing that. It looks like a correction in a crowded trade, and how far it goes is anyone's guess.

Should I buy the dip?

That depends on your timeline and how much more of a drop you could live with, and it is a decision for you or a licensed adviser rather than a news article.