Executive Summary
October 2026 started with a celebration and ended with a reckoning. On October 6, the S&P 500 closed at a record high. By the last day of the month, the Nasdaq had suffered its worst month since March 2025, and some of the biggest names in the market had just had their worst days in years.
The trigger was not a recession scare or a Fed shock. It was a question investors suddenly started asking out loud: when does all the money being spent on AI start paying for itself? JPMorgan analysts estimate that Amazon, Alphabet, Meta, Oracle and Microsoft will spend roughly as much on AI this year as they have in total since ChatGPT launched in late 2022. In October, investors looked at the bills and flinched. Alphabet lost roughly $500 billion in market value in a single day on October 29, its worst session as a public company. Intel fell almost 29% the next day.
But this was not a market-wide sell-off. It was a rotation. The S&P 500 fell just 0.93%, while the Dow rose 1.70% and the small-company Russell 2000 edged higher. The equal-weight S&P 500, which gives every company the same weight instead of letting the giants dominate, rose about 4.9%, beating the regular index by the widest margin since 2009. Energy, consumer staples, utilities and health care all gained around 10% or more, while technology and communication services fell 8% to 10%.
The backdrop stayed tense. September’s inflation reading came in hot at 3.7%, the jobs market added just 29,000 jobs, and the Fed held rates steady on October 28, with two officials voting for another hike. In the Strait of Hormuz, attacks on tankers surged and Brent crude climbed to about $117 a barrel, its highest level since April. One piece of good news: bond yields, which hit their highest level since 2002 early in the month, fell sharply after that, giving borrowers some relief.
October did not end the AI story. Microsoft’s cloud business grew 48%, and memory-chip maker SK hynix posted a record quarter. It did show that investors are now separating the companies selling the picks and shovels of AI from the companies paying for them.
What Actually Happened in October: The Big Picture
Index Performance
October looked quiet at the index level and dramatic underneath. Money moved out of the large technology and internet companies that dominate the S&P 500 and the Nasdaq, and into the parts of the market that had been left behind for most of the year: energy producers, consumer staples, utilities, health care and banks. Because the giants carry so much weight, their losses pulled the headline indices down even as most stocks rose.
| Index | October 30 Close | October Return | YTD Return |
|---|---|---|---|
| S&P 500 | 7,580.07 | -0.93% | +10.72% |
| Nasdaq | 25,437.00 | -5.30% | +9.45% |
| Dow Jones | 51,770.31 | +1.70% | +7.72% |
| Russell 2000 | 2,811.84 | +0.54% | +13.29% |
The S&P 500 is weighted by company size, so a handful of giants such as Nvidia, Microsoft, Apple, Alphabet, Amazon and Meta make up a large share of it. When those few stocks fall, the whole index falls, even if hundreds of smaller companies are rising. That is exactly what happened in October. The equal-weight version of the index, which gives each of the 500 companies the same weight, rose about 4.9% while the regular index slipped about 0.9%. Technology alone knocked roughly 3 percentage points off the S&P 500, while energy rose about 14% but added only about half a point, because it is a much smaller part of the index. For investors, the lesson is that a portfolio’s return depends heavily on how concentrated it is in the biggest names.
Earnings: The Market Starts Asking for Receipts
Third-quarter earnings season was strong on paper. Companies beat forecasts at a higher rate than usual, and profit growth stayed above 25% for a third straight quarter. But the market’s reaction was the real story. Companies spending heavily on AI were punished unless they could show the spending was already paying off, while the suppliers of AI hardware were rewarded.
What the Numbers Mean
- 30.2%: the blended year-over-year earnings growth rate for S&P 500 companies in the third quarter (FactSet, October 30), with 60% of companies reported. That is up from 29.1% expected at the end of September and would be the third quarter in a row above 25%.
- Smaller beats: 82% of companies beat estimates, above the long-term average, but by only 1.9% on average, against a five-year average of 7.5%. If that holds, it would be the smallest earnings surprise since late 2022. Companies are clearing the bar, but only just.
Alphabet (GOOGL): A Record Day, for the Wrong Reason (October 29)
Google’s parent reported revenue up 25% to $127.6 billion, and its cloud business more than doubled, up 103% to $30.7 billion. Investors focused on everything else. Earnings of $2.12 per share fell well short of the roughly $3.02 expected, largely because of an $8.2 billion hit from investment losses, mainly a markdown of its stake in SpaceX. Search revenue grew 12% to $63.3 billion, below forecasts, raising fears that AI chatbots are starting to eat into Google’s core business. Alphabet spent $51.4 billion on capital projects in the quarter, more than double a year ago, and free cash flow turned negative at minus $9.1 billion. Management said spending will rise significantly again in 2027. The stock fell about 12.6% on October 29, wiping out roughly $500 billion in market value, the second-largest one-day loss for any US company on record.
Meta (META): Strong Sales, First Cash Outflow in a Decade (October 21)
Meta’s revenue rose 26% to $64.6 billion, ahead of expectations, but a $9.89 billion legal charge cut reported profits, and free cash flow turned negative at about minus $2.1 billion, its first cash outflow in more than a decade. Meta narrowed its 2026 spending forecast to $135 billion to $145 billion and outlined plans to issue a new class of non-voting shares, which investors read as a sign it may raise large amounts of new equity to fund AI. The stock fell 7% on October 22, erasing roughly $124 billion in value.
Microsoft (MSFT) and Amazon (AMZN): Proof the Spending Can Pay (October 28 and 29)
Microsoft was the month’s reassurance. Revenue rose 19% to $92.3 billion, and its Azure cloud business grew 48% to $33.2 billion, evidence that AI demand is turning into real sales. It still spent $39.4 billion on equipment in the quarter, roughly double a year earlier. Amazon’s results were more mixed: revenue of $201.9 billion and earnings of $1.89 per share came in just below forecasts, but its AWS cloud unit grew 39% to $46 billion. The catch is cash: Amazon’s free cash flow over the past 12 months was minus $42.4 billion, as it heads for about $220 billion of capital spending this year. CEO Andy Jassy said AWS could grow more than 40% in each of 2027 and 2028.
Intel (INTC): A Beat, Then a 29% Plunge (October 29)
Intel beat third-quarter forecasts, with revenue up 21% to $16.51 billion and adjusted earnings of $0.52 per share against $0.40 expected. Its data center and AI business grew 78%. But its forecast for the final quarter, revenue of $15 billion to $16 billion against $17.1 billion expected, disappointed badly. Management warned that a slump in PC sales could last into 2027, and a disruption at a factory in Israel will cost about $300 million in revenue in each of the next two quarters. The stock, which had risen about 150% this year, fell 28.6% on October 30, its worst day in decades. It is a reminder of how quickly a stock that has run up can reverse when the outlook changes.
SK hynix: Selling the Shovels (October 28)
The contrast came from South Korea. SK hynix, one of the world’s biggest makers of the high-speed memory chips used in AI data centres, reported record quarterly revenue of about $79 billion and an operating profit of about $63 billion, keeping roughly 80 cents of every dollar of sales as operating profit. It said its AI memory is effectively sold out through 2029 and announced a shareholder return plan of up to 100 trillion won, about $75 billion. Its US-listed shares jumped about 13% on October 28. The message for investors: the companies supplying the AI build-out are being paid today, while the companies doing the building are still waiting for their payoff.
JPMorgan (JPM): Banks Open the Season Quietly (October 13)
The big banks kicked off the season. JPMorgan’s adjusted earnings of $5.75 per share fell short of the $5.92 expected, its first miss in six quarters, and it cut share buybacks by 84% from the previous quarter. CEO Jamie Dimon framed the buyback cut as good news, saying the bank has attractive ways to put the capital to work as loans grow 10% from a year ago. It also raised its full-year forecast for net interest income, the money it earns from lending. The stock slipped about 0.9%, and financial stocks went on to gain about 5.8% for the month.
Macro and Federal Reserve
September ended with a cooler inflation reading and hopes that the Fed could pause after its first hike since 2023. October delivered a pause, but not much comfort: the jobs market weakened, inflation picked up again, and the Fed made clear the door to another hike is still open.
September Jobs Report: Barely Growing (Released October 2)
The economy added just 29,000 jobs in September, far below the 84,000 economists expected. Earlier months were revised down too: July now shows a loss of 10,000 jobs, and August’s gain was cut to 133,000 from 162,000. The unemployment rate rose to 4.2% from 4.1%. Private employers added 46,000 jobs, while government payrolls fell by 17,000. Health care and construction have kept hiring, but finance, information and computer services have lost a combined 259,000 jobs over the past year.
September CPI: Inflation Back Up to 3.7% (Released October 14)
Consumer prices rose 0.6% in September, pushing annual inflation up to 3.7% from 3.4% and above the 3.6% economists expected. Core inflation, which strips out food and energy, rose 0.3% on the month and 2.6% over the year, up from 2.4%. Fuel was again the main cause: gasoline prices rose 9.1% in a single month and are up 34.2% from a year ago, while airfares are up 22.4%. After the report, markets put the odds of an October rate hike at about 50%, up from 20% beforehand.
The Fed Holds, but Two Officials Want to Hike (October 28)
The Federal Reserve kept its benchmark rate at 3.75% to 4%, as expected, but the vote was split 10 to 2: Governor Lisa Cook and Cleveland Fed President Beth Hammack both wanted another quarter-point hike. The Fed upgraded its description of the economy from “solid” to “strong” and noted that “energy and related prices have moved higher again in recent weeks.” Chair Kevin Warsh said inflation “remains elevated,” declined to give any guidance on the next move, and said that, with the midterm elections days away, “politics played no role in the decision.” By month end, futures markets saw roughly a 70% to 76% chance of a hike at the December 8 to 9 meeting.
Bond Yields: From a 24-Year High to a Rally (Through October)
Bonds had a dramatic month. On October 5, the 10-year Treasury yield closed at 5.31%, its highest since May 2002. Then it reversed. Weak jobs data, softer housing figures and money fleeing technology stocks for the safety of government bonds pushed the yield down to about 4.93% by October 30. That is a drop of roughly 0.36 percentage points, the biggest monthly decline since December 2023, and it partly undid September’s sell-off. Lower yields mean slightly cheaper borrowing for mortgages and companies, which helped rate-sensitive sectors such as utilities and real estate bounce back.
PCE Inflation: Moving the Wrong Way (October 29)
The Fed’s preferred inflation measure confirmed the CPI message. Headline PCE inflation rose to 3.6% in September from 3.4%, and core PCE rose to 3.1% from 3.0%. On a monthly basis, prices rose 0.5%, with core up 0.3%. After September’s encouraging reading, this showed that higher energy costs are still feeding through to everyday prices.
When the Fed leaves rates unchanged but signals it is still more worried about inflation than about growth, markets call it a “hawkish hold.” October’s decision fits that description: two officials wanted to hike, the Fed described the economy as strong, and Chair Warsh refused to rule anything out. For investors, it means borrowing costs are unlikely to fall soon, even though job growth has slowed sharply. That combination, rising prices with a cooling jobs market, is uncomfortable for the Fed and explains why markets still expect another hike in December. The sharp fall in bond yields during October suggests investors also see a growing chance that the economy slows enough to change the Fed’s mind next year.
The Geopolitical Backdrop
US-Iran: Attacks Surge, Oil Climbs Again
The war between the US and Iran, now in its ninth month, intensified around the Strait of Hormuz, the narrow channel that normally carries about a fifth of the world’s oil and gas. On October 4, Iran’s top negotiator, parliament speaker Mohammad Bagher Ghalibaf, said the Strait “will not open until our seven conditions” are met. Attacks on shipping then surged: about 10 tankers were struck between September 28 and October 4, and roughly 15 more between October 6 and 14. Crude passing through the Strait collapsed from about 20.8 million barrels on October 8 to 2.9 million on October 11, against a pre-war average of about 17 million a day.
Brent crude touched $110 on October 16, and on October 22, Iran-backed Houthi rebels struck targets in Saudi Arabia. In the final days of the month, two more tankers were hit within 24 hours, one by a mine and one by explosives attached to its hull from a small boat. President Trump said he expected the war to “end soon,” and Qatari mediators returned to Tehran, but investors were also bracing for possible US strikes after the November 3 midterm elections. Brent ended October at about $117.64 for the expiring December contract, its highest level since April and up roughly 14% for the month, a fourth straight monthly gain. WTI, the US benchmark, settled at $104.12.
Who Gains From $117 Oil
Expensive oil hurts consumers and airlines, but it is a windfall for producers and refiners. Energy was the best-performing sector of the month, up about 13.8%, and Exxon Mobil and Chevron both hit all-time highs on strong refining profits. The energy sector is now a small part of the S&P 500, under 3%, so its gains did little to offset the slide in technology. For investors, it is a reminder that a diversified portfolio holds companies that benefit from the same shock that hurts others.
Major Corporate Activity
Deals: Software, Gas and Groceries
Dealmaking stayed busy. On October 5, French industrial group Schneider Electric agreed to buy US engineering-software maker PTC for about $22.6 billion in cash, or $205 a share, a 42% premium. It is Schneider’s largest acquisition ever and a bet on software that helps factories design and run equipment. On October 26, EQT agreed to buy Range Resources in an all-stock deal worth about $12.8 billion, creating the largest natural gas producer in the US. And on October 29, DoorDash agreed to buy grocery-delivery rival Instacart for about $17 billion, or $65 a share, a 26% premium. The deal is expected to face antitrust scrutiny and may not close until 2028.
Anthropic Files to List, and GM Switches Exchanges
On October 26, Anthropic, the AI company behind the Claude chatbot, publicly filed to go public on the Nasdaq under the ticker ANT, the first of the leading AI labs to do so. Its filing showed first-half 2026 revenue of $16.3 billion, up from about $1.2 billion a year earlier, alongside large accounting losses, most of them non-cash. Share price and offering size have not yet been set, but reports point to a listing in Thanksgiving week. Its last private funding round, in May, valued it at $965 billion.
A day later, General Motors said it will move its stock listing from the New York Stock Exchange to the Nasdaq on November 17, joining Walmart, Hilton and others in recent switches. The main attraction is eligibility for the Nasdaq-100 index: inclusion forces funds that track it, such as the large QQQ ETF, to buy the stock.
Key Themes that Shaped Markets in October
The Aging theme was one of October’s clear winners, as investors rotated out of technology and into health care, a sector whose demand does not depend on the economic cycle. The health care sector rose about 9.7% for the month. Eli Lilly led the way on October 29: third-quarter revenue jumped 39% to $24.4 billion, well above the $22.6 billion expected, as its diabetes and obesity drugs Mounjaro and Zepbound brought in more than $16 billion between them. Lilly raised its 2026 revenue forecast to $91 billion to $92 billion, and the stock rose 6.6% to a one-year high on a day the S&P 500 fell. Merck and Johnson & Johnson rose alongside it.
Health insurers joined in. UnitedHealth beat third-quarter forecasts, with adjusted earnings of $4.69 per share against $4.14 expected, and raised its 2026 outlook to at least $20.50 per share, sending the stock up about 11% in a week. For investors, an ageing population means steady, long-term demand for drugs and care. The caution is that insurers’ profit margins remain well below where they were two years ago, and policy changes on drug pricing can move the sector quickly.
Digital Cash held up well in a difficult month for anything technology-related, helped by solid results from the big payment networks. Visa reported revenue up 13% to $12.1 billion and adjusted earnings up 17% to $3.48 per share, with total payments volume rising 9% to $4.1 trillion and cross-border volume, its most profitable business, up 14%. Mastercard followed on October 29 with revenue up 14% to $9.81 billion, adjusted earnings up 21% to $5.31 per share, and cross-border volume up 11%. PayPal’s revenue of $8.58 billion fell short of forecasts, but its profit beat expectations and it raised its full-year earnings forecast to $5.60 per share.
Payment networks earn a small fee on almost every card and digital transaction, so they benefit when people spend more, and even when higher prices simply make each purchase bigger. That makes them a steadier way to own the digital economy than many growth stocks. For investors, the risk is valuation and regulation: these companies trade at premium prices, and fee caps or competition from new payment systems could pressure margins over time.
Blockchain Ecosystem was October’s biggest loser, hit from two directions at once. Bitcoin fell about 7.3% to around $77,400, from a high of $86,513 on October 5, and Ether fell 16.1%. Crypto-linked stocks fell much harder. Several bitcoin miners have started renting out their data centres for AI computing, so they now trade partly as AI stocks, and they were caught in heavy hedge-fund selling of AI names between October 8 and 14. From September 30 to October 30, Cipher fell about 54%, IREN 41%, MARA 40% and Riot 36%, while exchanges and brokers such as Coinbase, Robinhood and Galaxy fell between 23% and 30%.
Then, on October 29, hackers stole about $6.3 billion from Binance, the world’s largest crypto exchange, the biggest crypto theft on record and more than four times the previous record, the $1.5 billion taken from Bybit in 2025. Investigators linked the attack to North Korea. Binance said customer funds were not touched, froze about $3 billion of the stolen assets and paused withdrawals, but Bitcoin fell below $77,000 and Coinbase, Strategy and Robinhood fell 7% to 12% the next day. For investors, the month was a reminder that blockchain stocks can fall far more than the coins themselves, and that the safety of the platforms that hold digital assets matters as much as their price.
Looking Ahead: What to Watch in November
The Midterms and the Strait of Hormuz
Americans vote in the midterm elections on November 3. Beyond the political outcome, investors are watching what happens in the Gulf afterwards: President Trump had said the US would not strike Iran before the vote, and Qatari mediators are pushing for a deal. Either a breakthrough or an escalation could move oil prices sharply, and with them inflation and interest rates.
October Inflation, Jobs, and the December Fed Meeting
The October jobs and inflation reports land in the first half of November, ahead of the Fed’s December 8 to 9 meeting. Markets currently see a roughly 70% to 76% chance of another hike. A cooler inflation reading or another weak jobs report could change that quickly, while oil above $110 makes it harder for inflation to fall.
Nvidia and the AI Spending Debate
Nvidia, the biggest supplier of AI chips, reports later in November. After October’s sell-off, its results and outlook will be the next big test of whether AI spending is still accelerating, and whether investors are willing to keep paying for it.
Anthropic’s IPO and GM’s Move
Anthropic’s listing, expected in Thanksgiving week, will be one of the largest technology IPOs ever and a test of investor appetite for AI after October’s wobble. GM begins trading on the Nasdaq on November 17, ahead of the Nasdaq-100’s annual reshuffle in December.
Three things will shape the next few weeks: whether the US and Iran find a way to reopen the Strait of Hormuz after the midterms, whether inflation cools enough for the Fed to skip a December hike, and whether Nvidia and the AI IPO pipeline can restore confidence in the AI spending boom. October showed that the market does not need Big Tech to rise in order to hold up: most stocks gained even as the giants fell. November will show whether that rotation is the start of a broader, healthier market or a short pause before the leaders take over again.
Conclusion
October 2026 was the month the market stopped taking AI spending on faith.
For most of the past two years, investors rewarded technology giants for spending more on AI. In October, they started asking for proof. Alphabet’s record one-day loss, Meta’s first cash outflow in a decade and Amazon’s negative cash flow all pointed to the same concern: the bill for the AI build-out is arriving faster than the revenue. Microsoft and SK hynix showed the other side of the story, that AI demand is real and, for some, already very profitable.
Meanwhile, the rest of the market quietly had a good month. Energy, staples, utilities, health care, financials and real estate all rose, the average S&P 500 stock gained around 5%, and the equal-weight index beat the regular one by the widest margin since 2009. That happened despite inflation rising back to 3.7%, a jobs market that barely grew, a Fed that is still leaning toward hiking, and oil at its highest since April.
For long-term investors, the lesson from October is about concentration. An index that looks flat can hide very different experiences depending on how much of a portfolio sits in a few large technology names. Spreading risk across sectors, paying attention to valuations, and understanding which holdings depend on cheap money or cheap oil matter more than any single headline. The Fed, the Strait of Hormuz and the AI spending debate all head into November unresolved.
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