What happened
Brent crude, the global oil benchmark, surged about 6.1 percent to roughly 99.78 dollars a barrel on 23 July 2026, briefly topping 100 dollars, after Houthi forces attacked Saudi oil tankers in the Red Sea. It was the highest level for oil in months.
The spike rippled straight into equity markets. The Dow Jones Industrial Average fell more than 600 points, US stock futures pointed lower, and the London FTSE 100 edged back after a strong run that had lifted it to a 20 week high near 10,717 the day before.
Short-term US government bond yields climbed to a 17 month high as investors bet that dearer energy would keep inflation sticky and central banks cautious. The sell-off landed on the same day the European Central Bank held its interest rates steady.
Traders described the mood as risk-off, with money moving out of shares and into the dollar and safe-haven assets as the Middle East tensions escalated.
Why it matters
Oil is the raw material behind an enormous share of the modern economy. It fuels lorries, planes, and ships, powers factories, and feeds into the price of plastics, fertiliser, and countless everyday products. When oil jumps, those costs tend to follow.
A sudden move above 100 dollars a barrel therefore threatens to push up inflation just as central banks were hoping it would keep falling. That is why the attack sent bond yields higher and share prices lower on the same day.
For ordinary households, the most immediate effect is at the petrol pump, where higher crude prices usually show up within a couple of weeks. Airlines, hauliers, and manufacturers also face steeper bills that can be passed on to customers.
The timing is awkward for policymakers. A fresh energy shock complicates the case for interest rate cuts, meaning the relief of cheaper borrowing could be delayed if oil stays high.
Explained simply
Think of oil as the blood supply of the global economy. When a shock cuts off part of the flow, every organ from your local petrol station to a factory in Germany feels the pressure at once.
Most of the oil in the world travels by sea, and some of the busiest routes pass through narrow chokepoints like the Red Sea. When ships on those routes come under attack, traders fear that supply could be disrupted, so they bid up the price to secure the barrels that are still moving.
The price you see is not just supply and demand today. It also reflects fear about tomorrow. Even if no single cargo is actually lost, the risk that future shipments might be delayed is enough to push prices sharply higher.
That is why a relatively contained event can move the global oil price by billions of dollars in a matter of hours. Markets are pricing in the possibility of worse to come, not just the here and now.
What it means for you
The clearest hit will be at the pump. If Brent holds near 100 dollars, UK drivers could see petrol and diesel rise by several pence per litre within two to three weeks, adding a few pounds to the cost of filling an average tank.
Household energy bills can follow with a longer lag, since wholesale gas prices often move alongside oil. Anyone on a variable energy tariff should keep an eye on the next price cap update rather than assume bills will keep falling.
Investors with FTSE 100 trackers may notice mixed effects. Big oil producers such as Shell and BP tend to gain when crude rises, which can cushion the index, while airlines and consumer-facing firms usually suffer. A broad global tracker will feel the wider market wobble.
If you were counting on falling inflation to bring a mortgage rate cut soon, a sustained oil spike could push that relief further out, so it is worth stress-testing your budget against slightly higher costs for a few more months.
The bigger picture
Oil shocks have a long history of derailing otherwise improving economies, and central banks watch them closely. The key question is whether this spike is a brief spasm or the start of a sustained climb.
If diplomacy calms the Red Sea tensions and shipping resumes normally, prices could fall back as quickly as they rose. If the conflict widens, 100 dollar oil could become a floor rather than a ceiling, with knock-on effects for inflation everywhere.
Watch three things in the coming days: the security situation around the Red Sea, whether major producers signal any increase in supply, and how bond markets read the inflation risk. Those signals will shape petrol prices and interest rates alike.