Money Simplified

The Weekly Market Update

10 October to 16 October 2026

This week the bill for expensive energy finally showed up in America’s inflation figures, and investors began asking who is paying for the AI boom.

Inflation jumped to 3.7%, with petrol doing most of the damage. American shares had a bad week, led by the technology companies that had carried them to a record only ten days earlier. Yet the interest rate on government debt fell, because frightened money went looking for somewhere safe.

Elsewhere, two ships sank in the Strait of Hormuz, a missile strike on Riyadh’s airport killed twelve people, and oil touched $110 a barrel. Tesla unveiled a car that briefly hovers. And in Britain, better than expected growth made a November rate rise more likely, with the Budget now eleven days away.

Markets at a glance

Figures as at the close on Friday 16 October 2026. The Week column is measured from the previous Friday’s close, 9 October 2026. Yearly changes are the 12 month change from Trading Economics, except the mortgage rate, which is Freddie Mac’s year-ago figure. For interest rates and bond yields, both change columns are shown in percentage points, so a move from 5.24% to 5.10% is −0.14 points. A bond yield is simply the yearly return a lender earns for lending money to the government, and it falls when more people want to buy the bonds. Green means the number went up, red means it went down, grey means it did not move, whatever that means for your wallet.

01 · Markets & Rates

Inflation jumped to 3.7%, shares fell, and borrowing costs went down anyway

What happened. On Wednesday the American government reported that prices in September were 3.7% higher than a year earlier, up from 3.4% in each of the two months before and more than the 3.6% forecasters expected. Prices rose 0.6% in the month alone. Petrol was the main culprit, up 9.1% in a single month and 34% over the year, with energy as a whole up 20% and airline fares up 22%. More worrying for the Federal Reserve, the measure that strips out food and energy also rose, to 2.6% from 2.4%, a sign that dear fuel is seeping into the price of other things. Thursday brought more of the same. Prices charged by producers rose 1.3% in a month against a forecast of 0.5%, and although shoppers spent 0.8% more than in August, most of the extra went on petrol. Take out petrol stations and spending rose just 0.2%. The stock market had a bad week. The S&P 500, the index that tracks 500 of America’s biggest companies, closed Friday at 7,659, down 1.9% on the week, and the technology-heavy Nasdaq lost 4.5%. Chip makers fell for eight days in a row, their longest losing run since the 2008 financial crisis. The bond market did the opposite of what you might expect. The interest rate on 10 year government debt briefly topped 5.3% on Wednesday morning, then fell to end the week at 5.10%, down from 5.24%, as investors sold shares and bought the safety of government bonds. On Friday the Fed’s chair, Kevin Warsh, speaking at the IMF meetings in Bangkok, said the economy “has broadly conformed to our expectations” and would not be drawn on whether rates go up again this month: “I don’t prejudge meetings.” Mortgages did not budge. Freddie Mac’s average 30 year rate stayed at 7.40%, against 6.27% a year ago.

Why it matters. For most households the number that matters is the gap between pay and prices. Wages are growing about 3% a year and prices 3.7%, so the average pay packet buys less than it did twelve months ago. Heather Long, chief economist at Navy Federal Credit Union, put it plainly: “Inflation has wiped out wage gains for 6 months now. It’s a financial squeeze.” The fall in bond yields is less comforting than it looks. Rates came down because people were afraid, not because inflation is beaten, and that kind of relief can reverse quickly. The odds of a rate rise at the Fed’s meeting this month jumped to about one in two straight after the inflation report, then drifted back to roughly one in four by Thursday as Fed officials sounded cautious. A rise by December is still the clear expectation, at around three in four.

What to watch. The Fed decides on Tuesday 27 and Wednesday 28 October. Before then, the big technology companies start reporting their summer profits, with Tesla on Wednesday 21 October, and the market will be looking for proof that their huge AI spending is earning money. If the bond market’s nerves settle and shares steady, expect the 10 year rate to drift back up towards 5.3%.

02 · AI & Technology

The AI boom’s borrowing got its first real test, and one company took the brunt

What happened. CoreWeave rents out computing power to AI companies. It has borrowed about $50 billion to build data centres, has never made a profit, and lost $1.2 billion last year on sales of $5.1 billion. On Wednesday its shares closed down 15.5%, and by Friday they had lost about a quarter of their value over the week, their worst week in almost a year. Two things landed on the same day. The hot inflation report raised the chance of higher interest rates, which makes heavy debts dearer to carry. And the research firm Gartner published a warning that four in five of the so-called neoclouds, companies like CoreWeave that borrow to build AI computing and only earn once customers start paying, could stop operating independently by 2030. It ranked CoreWeave as the most exposed of about 100 such firms. The company’s debt told the same story. The yield on one of its bonds briefly rose above 16% on Thursday, and the cost of insuring its debt against default climbed to a record. Rivals followed it down. Nebius lost 10% over the week, and Applied Digital and IREN 9% each. On Friday the selling spread to the wider sector. The Nasdaq fell 2.1% on the day, and Goldman Sachs said hedge funds were selling AI shares at close to the fastest pace in over a year. CoreWeave’s chief executive, Michael Intrator, told staff in a memo that markets can “misunderstand and act irrationally”, pointing to $104 billion of signed customer contracts. Nvidia, its second-largest shareholder, backed him. “CoreWeave’s financial strength is improving every day,” said its chief executive, Jensen Huang. The shares kept falling anyway.

Why it matters. Until now the AI boom has mostly been paid for out of the enormous profits of a few giant companies. Increasingly it is being paid for with borrowed money, and borrowed money has a price that moves. Every rise in interest rates makes the sums harder for a company that spends $35 billion or more a year on equipment and only earns it back over years of leases. Some investors think CoreWeave will need fresh capital. Others, including the ratings agency Moody’s, point out that it does not buy chips on spec and has several ways to raise money. What everyone agrees is that the mood has changed. Investors are asking about cash and debt rather than growth, and they are doing it just as the Fed may be about to raise rates again. It is worth keeping the scare in proportion. On Wednesday the Dutch firm ASML, which makes the machines that make chips, reported record quarterly sales of 11.7 billion euros and said customers are already talking about what they will need in 2029. Demand for AI computing is real. The question this week was who can afford to finance it.

What to watch. CoreWeave’s share price and bond yields, which have become a thermometer for the whole sector. The spending plans the big technology companies announce with their results over the next few weeks. And the Fed on 28 October, because the companies with the most debt have the most to lose from higher rates.

03 · Geopolitics & Energy

Two ships sank in the Strait of Hormuz, Riyadh’s airport was hit, and oil touched $110

What happened. A week after President Trump promised not to strike Iran before the elections, the war widened on two fronts. On Saturday 10 October a projectile struck a passenger terminal at Riyadh’s main airport, killing at least twelve people, among them an American, and injuring more than 300. A second strike hit the airport on Sunday, and Dammam’s airport was attacked the same day. Saudi Arabia blamed Yemen’s Houthis, who are backed by Iran, called the attack a “war crime” and promised to “respond decisively”. Asked whether America would join the fight against the Houthis, Trump said: “We may. We’re gonna look at it.” Mohsen Rezaei, who heads Iran’s national security council, called Washington’s latest offer “insufficient”. At sea it was the worst week of the war for merchant shipping. At least six vessels were struck on Sunday alone. On Tuesday the GFS Pride, a Singapore-flagged container ship, was hit by a projectile in the strait, caught fire and sank. All 21 crew were rescued. It is the second large ship to be sunk since the war began, and the International Maritime Organization now counts more than 100 attacks and at least 24 seafarers killed. Oil flowing through the strait in the week to 13 October averaged 11.6 million barrels a day, against 17.2 million before the war. On Thursday the International Energy Agency agreed to speed up the release of the last 100 million barrels of the emergency stocks its members promised in March, more than 20 million of them diesel. Brent crude, the main international oil price, still closed Friday at $109.86 a barrel, its highest finish since May, after touching $110 during the day. It rose 4.9% over the week, and the American benchmark closed above $100 for the first time since September.

Why it matters. This is the link between story three and story one. Oil at $110 is why American petrol costs a record $4.33 a gallon and why inflation is 3.7% rather than falling. Trump’s promise not to strike Iran bought a calmer week on Wall Street last week, but it did nothing to stop the Houthis, the attacks on ships or Iran’s hardening line, and there is now a real possibility of American forces joining a new front in Yemen. The IEA’s release is mostly a speeding up of oil already promised, not new supply, and the agency says the world’s oil stocks are already 509 million barrels below where they were before the war. Its own assessment is that the diesel shortage could last into 2027.

What to watch. Whether America joins Saudi strikes on the Houthis. Israel’s election on 27 October and America’s on 3 November, the two dates everyone in the region is working around. Any reply from Iran to the American proposal. And whether Brent holds above $110, which would feed straight into October’s inflation figures on both sides of the Atlantic.

04 · Business & Economy

Tesla showed off a car that hovers, and Wall Street started pricing a merger with SpaceX

What happened. On Thursday night in Waco, Texas, Elon Musk finally unveiled the new Tesla Roadster, a sports car first promised in 2017. The headline feature is a set of thrusters built by SpaceX, Musk’s rocket company. In the demonstration the car left a curved ramp, steadied itself in mid-air and landed. Tesla is taking $50,000 deposits in America, Canada and China, has not announced a price, and says production will not start until 2028. “You’re going to see the results of what happens when you have a collaboration with the world’s best car company,” Musk said. The car was only half the story. SpaceX’s president, Gwynne Shotwell, said combining the two companies “might make Elon’s life a little easier”. Dan Ives of Wedbush, a long-standing Tesla bull, said the Roadster strengthened the case for the two operating as a single engineering platform and has put the chance of them coming under one roof in 2027 at 80%. Dan Levy at Barclays said a deal could be announced before Tesla’s annual shareholder meeting, which he expects by 6 December, most likely with SpaceX buying Tesla in shares. Prediction markets now put the odds of a merger by early 2027 above 50%. The shares were not swept along. Tesla closed down 2.1% on Friday and SpaceX 1.7%, and Tesla is still about 19% lower than at the start of the year.

Why it matters. For anyone who owns Tesla shares, directly or through a fund, a merger would mean swapping them for shares in SpaceX, a company valued at around $2.2 trillion that only joined the stock market in June and is also trying to borrow $40 billion for AI chips. That is a very different investment from a car maker. Supporters say Musk’s companies already share engineers, ideas and now hardware, and one company would be simpler. Sceptics, including Gene Munster of Deepwater Asset Management, called the demonstration an engineering showcase with little commercial value for Tesla, whose car sales have been under pressure all year. A flying stunt does not change that. It does make clear where Musk thinks the value lies.

What to watch. Tesla’s results on Wednesday 21 October, the first chance to see how the car business is actually doing. Any formal announcement before the shareholder meeting. And SpaceX’s own share price, since a deal paid in SpaceX shares is worth whatever those shares are worth on the day.

05 · Personal Finance

Britain’s economy grew when it was expected to shrink, which makes a rate rise more likely

What happened. On Thursday the Office for National Statistics said the economy grew 0.1% in August. Forecasters had expected it to shrink by that much. Compared with a year earlier the economy is 2.1% bigger, the strongest annual growth since August 2022, and Deutsche Bank’s Sanjay Raja said Britain “remains the fastest-growing G7 economy”. The detail was less cheerful. Factories did the work, with production up 0.8%, while services were flat, construction fell 0.2% under the weight of high mortgage rates, and spending in pubs and restaurants dropped 2.7%. The government’s cost of borrowing had a nervous week. The interest rate on 10 year gilts rose to 5.46% on Wednesday as American inflation spooked bond markets everywhere, then fell back and ended the week at 5.38%, a little below last Friday’s 5.42%. Mortgage rates edged down. Rightmove’s average two year fixed deal is 5.53% and the five year 5.51%, each a fraction lower than last week but about a full percentage point higher than a year ago, and NatWest and HSBC both announced cuts on Thursday. Markets still expect the Bank of England to raise its rate from 3.75% to 4% on 5 November, and are pricing in three more quarter-point rises next year.

Why it matters. Stronger growth sounds like good news, and it is, but with inflation at 3.1% and expected to rise it also removes the Bank of England’s main excuse for waiting. A rate rise in November now looks more likely, not less. The split in the figures matters too. The parts of the economy that depend on borrowing, building and going out are already shrinking, which is what high rates are designed to do, while manufacturing and business investment in technology are carrying growth. If your fixed mortgage deal ends in the next few months, the rate you are offered is likely to be about one percentage point higher than the one you are leaving. On a £200,000 loan over 25 years, one extra point costs roughly £115 a month.

What to watch. A heavy week of British data. Jobs and wages on Tuesday 20 October, then September’s inflation figure and the government’s borrowing numbers on Wednesday 21 October. The September inflation rate is traditionally used to set next April’s increase in many benefits and in business rates, so it matters beyond the headline. Then the Budget on Wednesday 28 October and the Bank of England on Thursday 5 November.

Also worth knowing

America’s big banks made a lot of money, and set more aside for bad loans. JPMorgan’s quarterly profit rose 6% to $15.3 billion and Goldman Sachs’s jumped 29% to $5.3 billion, helped by a 72% rise in income from trading shares in a volatile market. Wells Fargo put aside $1.03 billion for loans that may go bad, up from $681 million a year earlier, even as its chief executive said customers are “doing well”.

Gold and bitcoin both slipped. Gold ended the week 0.7% lower at $4,166 an ounce, and bitcoin fell 1.3% to about $81,500, its second weekly fall in a row and about 28% below where it was a year ago.

American pensioners get a 3.6% rise in January. Social Security payments, the American state pension, will go up 3.6% in 2027, worth about $75 a month on the average payment. The increase is set by the inflation figures published this week, so this year’s dear petrol is paying for it.

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This newsletter is for educational purposes only and does not constitute financial advice. Figures as at the close on 16 October 2026.