Money Simplified

The Weekly Market Update

19 September to 25 September 2026

This week the bond market took charge.

Diplomats talked in New York for five days, about Iran and about China, and produced deadlines rather than deals. Investors did not wait. The interest rate the American government pays to borrow for ten years closed at its highest since 2007, Britain’s equivalent is near a two-decade high, and the average American mortgage went back above 7% for the first time since early 2025.

Shares still rose, helped by a Meta rally and by oil ending the week almost where it started after a wild ride in between. Below is what moved, why, and what it means for the Budget on 28 October.

Markets at a glance

Figures as at the close on Friday 25 September 2026. The Week column is measured from the previous Friday’s close, 18 September 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 5.00% to 5.17% is +0.17 points. A bond yield is simply the yearly return a lender earns for lending money to the government, and it rises when the price of the bond falls. Green means the number went up, red means it went down, whatever that means for your wallet.

01 · Markets & Rates

America’s borrowing costs hit their highest since 2007, and the Fed says more rate rises are coming

What happened. The interest rate on 10 year American government debt closed at 5.19% on Thursday, its highest closing level since July 2007, and ended the week at 5.17%. The 30 year rate reached 5.50%, a level last seen in 2004. The trigger was the Federal Reserve’s vice chair, Michael Barr, who said on Wednesday: “In my base case, further policy adjustments are likely to be needed to ensure inflation comes down to target in a timely fashion.” Three other Fed officials, Susan Collins, Alberto Musalem and John Williams, said much the same. On the same day a closely watched survey of American businesses showed activity growing at its fastest pace in more than five years, with firms reporting their steepest rise in costs since October 2022 because of fuel, freight and wages. Traders now put the chance of another rate rise at the Fed’s meeting on 27 and 28 October at about 71%, up from roughly 64% at the start of the week. The selling spread: government bond yields in Britain, Japan and Germany all hit fresh highs during the week.

Why it matters. A bond yield is the return investors demand for lending to a government, and almost every other borrowing cost is built on top of it. When it rises, mortgages, business loans and credit cards follow. The average American 30 year mortgage rate rose to 7.03% this week, according to Freddie Mac, the first time it has been above 7% since January 2025. Rick Rieder of BlackRock, one of the world’s biggest bond investors, called the move “not a crisis but an eye-opener”. What makes this episode unusual is that shares kept rising anyway. The S&P 500 finished the week up 1.2% and within about 1% of its record, because company profits are expected to grow around 29% this quarter and that is enough, for now, to outweigh dearer money.

What to watch. The Fed decides on 28 October, and the September inflation figure in the middle of the month will settle whether that 71% becomes a certainty. The bigger question is how long shares can shrug this off. JPMorgan’s analysts note that in past periods of strong profit growth, 10 year yields have been able to rise to around 5% before share prices started to suffer. We are now above that line.

02 · Geopolitics & Energy

America and Iran talked at the UN about a step-by-step deal to reopen Hormuz, and oil went on a rollercoaster

What happened. On Monday President Trump told the United Nations General Assembly that Iran was “the bully of the Middle East, but they are the bully no more”, and asked out loud whether to “annihilate the Islamic Republic and do it quickly”. The same day his envoys Steve Witkoff and Jared Kushner spent three hours with Iranian officials, which Trump called “a very good meeting, a very productive meeting” with “a lot of momentum”. Iran’s foreign minister, Abbas Araghchi, set three conditions for reopening the Strait of Hormuz within seven days: lift the American naval blockade of Iranian ports, release frozen Iranian money, and stop military operations across the region. On Tuesday the Treasury shut all Iranian airlines out of the American system, and Iran’s president, Masoud Pezeshkian, told the UN that Tehran “would never surrender” but “still believes in diplomacy”. By Thursday, Reuters and Bloomberg reported the two sides were exploring a deal in stages: Iran reopens the strait, America lifts the blockade, wider talks follow. Oil swung with every headline. Brent settled below $100 a barrel on Tuesday for the first time since early September, jumped about 7% over Wednesday and Thursday to $106.60, then eased on Friday to settle at $104.32, just 0.4% higher than a week earlier.

Why it matters. This is the first time since the war began that both sides have described the same shape of deal. The sticking point is old and simple: who moves first. A senior Iranian official put it this way: “One way forward would be to solve the crisis in stages. The first would be to end the blockade and reopen Hormuz.” A Trump administration official replied that “Iran is desperate for a deal, President Trump holds all the cards”. Meanwhile the physical picture improved a little. Saudi Arabia restarted its East-West pipeline, shut after the drone attack on 11 September, and shipments through Hormuz reached 33.7 million barrels this week, about the same as the week before. For anyone filling up a car, though, the relief has not arrived: American diesel is around $6.50 a gallon and petrol around $4.50.

What to watch. Trump has said a settlement is more likely after America’s midterm elections on 3 November, and Dennis Ross, a veteran American negotiator, puts the chance of a deal before then at about 30%. Qatari and Omani mediators are still shuttling between the two sides in New York. If the phased deal firms up, the first thing that will move is the oil price, and it will move before you read about it.

03 · AI & Technology

Meta’s Muse became the most downloaded app in America, and Meta’s shares ended the week about 13% higher

What happened. Muse is Meta’s personal AI assistant. It plugs into your email and calendar, books appointments, shops for you and, on Apple computers, can operate other programs on your behalf. It went on general release in America in early September and by this week was the top free app on both Apple’s App Store and Google Play, with about 560,000 daily users after 11 days according to the research firm Sensor Tower. On Monday Meta’s shares closed up 11.4% at $741.25. At its Connect event on Wednesday the company showed a $1,299 pair of virtual reality glasses due next spring, a small Muse Charm pendant for the holidays, and a plan to give Muse its own email address so you can forward it jobs. Mark Zuckerberg explained how it will pay for itself: “We believe that Muse will make you money. And we are standing behind this by making Muse free for a huge number of tokens with the expectation that over time we will profit by taking a small fee from transactions.” The shares hit a record $779.82 on Thursday, fell about 3% on Friday, and still finished the week roughly 13% higher. Chip maker AMD had its own moment on Monday, closing up 10% and passing $1 trillion in stock market value for the first time.

Why it matters. Meta spends tens of billions a year on AI and until now had no product to show for it, so investors were paying for a promise. Rich Greenfield of LightShed Partners said the company now has a “true right to win in AI”, and JPMorgan’s Doug Anmuth said Muse “has the potential to become the most widely used consumer AI application since ChatGPT”. The business model matters too. If an assistant does your shopping, the shop pays Meta a cut and you never see an advert. That worried other companies: shares in gym chains and subscription businesses fell this week on the thought that an assistant which cancels things you no longer use is bad for them. A note of caution: several of the usage figures doing the rounds this week are unconfirmed, and Meta will not publish its own until its quarterly results in late October.

What to watch. Three tests. Whether the free tier survives contact with the electricity bill, since running these assistants is expensive. Whether the retailers already signed up, including Walmart, Best Buy, Expedia and Instacart, actually see sales through Muse. And whether the 13% jump survives the first set of official numbers.

04 · Business & Economy

Trump and Xi met for three days in Washington and came away with two new deadlines

What happened. China’s president, Xi Jinping, spent Wednesday to Friday in Washington for a state visit that included a state dinner and a closing ceremony at the National Archives. The trade truce the two countries agreed last October, which put a round of tariff rises on hold, was extended by two months, with negotiators due back at the table by 10 January 2027. Trade representative Jamieson Greer said the two sides had agreed to cut tariffs on a “subset” of less sensitive goods, with details promised on Monday. On artificial intelligence, the two leaders agreed to meet again at a safety summit in Shenzhen in November and set up what the American ambassador David Perdue called “a crisis mechanism” so the two governments can alert each other if something goes wrong. Trump called it “a tremendous visit” with “great strides” for both countries.

Why it matters. These are the world’s two largest economies, and tariffs between them end up in the price of almost everything on a shelf, so a truce that holds is worth more to your shopping basket than any single announcement. But the research firm Capital Economics summed up the mood: the visit offered “little beyond a short reprieve”. Nothing was settled on the hard questions, such as advanced chips or a new 7.5% tariff Washington is considering on Chinese goods it says are made in excess. The AI part is telling too. Two weeks after the heads of the biggest AI labs asked for the race to slow down, neither government showed any appetite for rules that would limit the most powerful models. Greer said the coming months would decide “whether or not to continue this period of relative peace on the economic front”.

What to watch. Monday’s tariff list will show whether anything you buy gets cheaper. Then the Shenzhen summit in November, and the 10 January deadline, which lands just as the American midterm results have settled and a new Congress is arriving.

05 · Personal Finance

Britain’s Budget is a month away, and the bond market has already spent half of the Chancellor’s room to manoeuvre

What happened. The interest rate on 10 year British government debt, known as a gilt, closed the week at 5.36% after touching 5.4%, a level not seen in almost two decades. Chancellor John Healey delivers his first Budget on Wednesday 28 October, and each quarter point rise in gilt yields adds roughly £2.5 billion a year to the government’s interest bill, which is already around £200 billion a year. Analysts estimate that more than half of the £24 billion cushion the Chancellor had against his own borrowing rules has now gone. Bank of England officials added to the pressure: Governor Andrew Bailey said persistently high energy prices would make it harder to keep rates on hold, and two of his colleagues, Sarah Breeden and Clare Lombardelli, said they were moving closer to voting for a rise. Markets put the chance of a rate rise on 5 November at about 80%.

Why it matters. Nigel Green of deVere Group put it bluntly: “Britain’s budget is being written in the bond market right now.” Less room means more tax rises or spending cuts, and the Budget is where you will feel it. The government has already confirmed some measures aimed at household bills: VAT taken off electricity bills, a £2 cap on bus fares, and a ban on “pretend prices” with easier subscription cancellation from January. The measures being talked about but not confirmed include changes to capital gains tax, a lower threshold for the mansion tax, and a review of the personal allowance, the amount you can earn before paying income tax. For anyone with a mortgage, the gilt yield is the number that lenders price fixed deals from, so higher gilts mean dearer fixes even before the Bank of England moves.

What to watch. The Office for Budget Responsibility takes its snapshot of gilt yields in a confidential window before the Budget, so where yields sit over the next few weeks decides how much money Healey has to play with. If your fixed rate ends within the next year, most lenders let you lock a new deal three to six months early, and this is a week in which that option got more valuable, not less.

Also worth knowing

Bitcoin climbed to its highest since January. It briefly topped $87,000 in the middle of the week after American bitcoin funds took in more than $2.1 billion over three days, including $999 million on Monday alone, the biggest day of the year. It ended the week at $84,013, up 3.6%, and is still about a third below its record of around $126,000 set last October.

Gold fell 2.2% to $4,285 an ounce. When bond yields rise, gold, which pays no interest, looks less attractive by comparison, and this week traders also priced a roughly 70% chance of a Fed rate rise in October and 95% for December. Gold is still 13.7% higher than a year ago.

American shoppers are gloomier than at any time since the spring. The University of Michigan’s consumer sentiment index fell to 48.1 in September, a four-month low and 15% below where it started the year. Households now expect prices to rise 4.6% over the coming year, the highest reading since June and up from 3.4% before the Iran war began.

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This newsletter is for educational purposes only and does not constitute financial advice. Figures as at the close on 25 September 2026.