Money Simplified

The Weekly Market Update

5 September to 11 September 2026

For a few weeks now this newsletter has been saying that interest rate rises were on their way back. This week they arrived.

The European Central Bank raised its rates on Thursday and called the decision a “no brainer”. In America, Friday’s inflation figures all but sealed a rate rise next week. And the reason behind both, the price of oil, went back above $100 a barrel for the first time since May after the biggest week of attacks on shipping since the war with Iran began.

Next week is a big one. The Federal Reserve decides on Wednesday, the Bank of England on Thursday and the Bank of Japan on Friday.

Markets at a glance

Figures as at the close on Friday 11 September 2026. The Week column is measured from the previous Friday’s close, 4 September 2026. Yearly changes are the 12 month change from Trading Economics. For interest rates and bond yields, both change columns are shown in percentage points, so a move from 4.79% to 4.97% is +0.18 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

American inflation refused to budge, and a rate rise next week is now close to certain

What happened. Figures published on Friday showed prices in America were 3.4% higher in August than a year earlier, exactly the same as in July. Prices rose 0.4% in the month alone, and more than a third of that came from petrol, which is 27% dearer than a year ago. Strip out food and energy and prices still rose 0.3% in the month, a touch more than the 0.2% economists expected. Traders now put the chance of the Federal Reserve raising rates on 16 September at close to 90%, up from about 70% the day before. The interest rate on 10 year American government debt climbed to 4.97%, its highest since October 2023. Shares fell for four days in a row before bouncing on Friday, and the S&P 500 finished the week down 0.8%.

Why it matters. A rise would take the Fed’s main rate to between 3.75% and 4%, and that feeds through to mortgages, credit cards and car loans. The average American 30 year mortgage rate has already climbed to 6.76%. The awkward part is that this inflation is coming from fuel, not from an economy running too hot, so higher rates do not fix the cause. Kathy Bostjancic, chief economist at Nationwide, put the worry plainly: “The renewed march higher in oil, gasoline and diesel prices adds to concerns that higher energy prices could spill over to other goods and services.” Greg Daco of EY-Parthenon switched his forecast from no change to a rise within hours of the report.

What to watch. The Fed’s decision on Wednesday 16 September. Deutsche Bank now expects two rises this year and Bank of America three. The thing to listen for is not this month’s move but how many more chair Kevin Warsh hints are coming.

02 · Geopolitics & Energy

Oil went back above $100 after the worst week for shipping since the war began

What happened. Overnight on 8 to 9 September the United States destroyed five Iranian oil tankers, saying Iran’s Revolutionary Guard had twice tried to hit an American warship. Iran hit back, claiming attacks on ten ships near the Strait of Hormuz and firing 20 ballistic missiles at an American base in Jordan, 18 of which were shot down. On Thursday Houthi forces in Yemen took the port of Mocha near the southern entrance to the Red Sea, and the number of ships passing through Hormuz fell to seven in a day, against a recent average of about 15. Brent crude oil rose above $100 a barrel for the first time since May, touched roughly $108 on Thursday, and settled at $104.61 on Friday, up 9.5% on the week. In America the average price of diesel passed $6 a gallon for the first time ever.

Why it matters. Before the war, roughly a fifth of the world’s oil and gas passed through Hormuz. The International Energy Agency now expects the world to use 2.5 million fewer barrels of oil a day this year than last, the biggest fall since the pandemic, not because anyone wants less oil but because they cannot get it. Diesel is the fuel of lorries, trains, ships and farms, so a record diesel price works its way into the cost of almost everything on a shelf. As Patrick De Haan of GasBuddy put it: “Every truck, every delivery, every package, every grocery run just got more expensive.”

What to watch. On Monday 14 September Iran meets the Gulf states and Iraq in Oman to discuss a temporary shipping lane through the strait and clearing mines. Oil fell 2.8% on Friday on the news of that meeting alone. A deal there is the single quickest way for oil, inflation and interest rates to calm down at the same time.

03 · Business & Economy

Europe raised interest rates and called it a “no brainer”

What happened. On Thursday 10 September the European Central Bank raised its three main interest rates by a quarter of a percentage point, taking the deposit rate, the one that matters most, to 2.50%. It is the bank’s second increase this year after one in June, and every policymaker voted for it. President Christine Lagarde called the decision a “no brainer”. The bank now expects inflation across the euro area to average 3.0% this year and 2.5% next year, and said it would stay above the 2% target well into 2027 because of the conflict in the Middle East. Investors now price at least one more rise by December.

Why it matters. A year ago the world’s big central banks were all cutting. Now they are moving together in the opposite direction: the ECB on Thursday, the Fed almost certainly next Wednesday, and the Bank of Japan expected to raise on Friday 18 September. When borrowing costs rise everywhere at once there is nowhere for the effect to hide. Companies pay more to invest, governments pay more on their debt, and mortgage rates rise on both sides of the Atlantic. Lagarde’s own summary: “We are determined to deliver on our target.”

What to watch. Lagarde refused to say what comes next: “Can’t anticipate what will be the next move.” The next euro area inflation figures arrive at the start of October. If energy keeps pushing them up, the talk will turn to another rise before Christmas.

04 · AI & Technology

Oracle has $664bn of orders in the book, and investors still sold the shares

What happened. Oracle, the database company that has turned itself into one of the biggest builders of AI data centres, reported on Thursday evening. Revenue rose 30% to $19.3bn, and sales from renting out computing power more than doubled, up 121% to $7.4bn. Its backlog, the value of signed contracts it has yet to deliver, reached $664bn, up $209bn in a year, including more than $30bn of new AI deals signed in the quarter. The catch: it spent $28.5bn on data centres and equipment in three months, more than three times the $8.5bn of a year earlier. It burned $5.4bn more cash than it took in, and its debt stands at $125bn. Shares jumped 8.5% at the open on Friday, then closed down 1.7% at $150.28.

Why it matters. The AI boom rests on companies like Oracle borrowing and spending enormous sums before the revenue arrives. Roughly half of that $664bn backlog is reported to be with a single customer, OpenAI, so Oracle’s fortunes now depend heavily on one company’s ability to keep paying. Friday’s reversal is a sign that investors no longer reward growth on its own. They want to know when the cash comes back.

What to watch. Oracle has promised more detail on when it will stop burning cash at an investor day in October. Until then, every quarterly report from the big AI spenders will be read the same way: not “how much did you sell” but “how are you paying for it”.

05 · Personal Finance

UK mortgage rates are creeping up again, before the Bank of England has done anything

What happened. HSBC and NatWest raised the prices of their fixed rate mortgages at the start of the month, and others followed. By Monday the average two year fixed deal had risen to 5.63% and the average five year deal to 5.68%, its highest since May, according to Moneyfacts. The reason is swap rates, the wholesale rates lenders pay to fund fixed deals, which follow where markets think Bank Rate is heading, and they have jumped along with the oil price. Governor Andrew Bailey told MPs on Wednesday that the Bank has no plan to raise rates come what may: “What I want to dispel is the idea that we’ve really got a secret plan, we know where we’re going to go to and it’s unconditional.” Traders expect no change at 3.75% on Thursday, but price in at least two rises by March 2027.

Why it matters. Fixed mortgage rates move before the Bank does, not after. A quarter point rise on a £250,000 mortgage over 25 years adds roughly £38 a month, or about £456 a year. Nicholas Mendes of broker John Charcol: “For buyers, the risk is that the rate they have based their budget around disappears while still searching.” And with the economy growing faster than expected in July, there is one less reason for the Bank to come to the rescue with a cut.

What to watch. Thursday 17 September. The decision itself is expected to be a hold. The number that matters is how many of the nine policymakers vote for a rise. Only a fortnight ago the argument was about when to cut.

Also worth knowing

Anthropic may be heading for the biggest stock market listing in history. Reuters reported on Friday that Nvidia is in talks to put up to $10bn into the AI company’s share listing as an anchor investor. The listing could raise as much as $100bn at a value of around $2 trillion, and is expected before America’s November elections. Anthropic declined to comment and the talks are described as preliminary, so treat it as a report rather than a done deal.

The UK economy grew when it was expected to stand still. Output rose 0.4% in July against forecasts of no growth at all, and was 1.6% higher than a year earlier. Services did the heavy lifting, helped by AI and cloud computing, and the FTSE 100 rose 0.7% on Friday.

Gold fell for a third week running and bitcoin slipped. Gold ended the week at $4,350 an ounce, down 1.9%, as higher bond yields made an asset that pays no interest less attractive. Bitcoin finished around $77,100, down 3.3% on the week and roughly 39% below its record of about $126,000 set last October.

Money Simplified

Finance in plain English.

We take complicated ideas about money, markets and personal finance and make them easier to understand — without the jargon.

If this newsletter made you think, share it with someone who might find it useful.

And if there’s a financial topic you’ve always wanted explained in plain English, just reply to this email and tell me.

Until next time,

Money Simplified

Finance in plain English · moneysimplified.uk

Want to take this further?

I built SimpleMarket to make financial markets easier to understand — with simple explanations, market tools and AI assistance designed for people who don’t speak “finance”.

simplemarket.app

This newsletter is for educational purposes only and does not constitute financial advice. Figures as at the close on 11 September 2026.