Brent crude breached $100 a barrel on Thursday, its highest level since July, after fresh US‑Iran skirmishes in the Gulf and Houthi strikes on Saudi ports.

Market reaction to the spike

By 0900 GMT the benchmark rose more than 3% to $101.20, pushing futures on the New York Mercantile Exchange up a further 2% as investors priced in the risk of supply interruptions. European equities slipped, with energy‑intensive stocks such as airlines and chemicals posting losses of up to 1.5%.

Currency markets also felt the pressure; the pound fell 0.4% against the dollar as traders hedged against higher import bills, while the euro slipped 0.3% on similar concerns.

Geopolitical triggers

The price jump follows a reported exchange of fire between US warships and Iranian naval forces in the Strait of Hormuz, a chokepoint that handles roughly a fifth of global oil shipments. At the same time, Yemen’s Houthi rebels launched missile attacks on Saudi oil terminals, temporarily halting loading at the Ras Tanura refinery.

Analysts at the International Energy Agency warned that any prolonged closure of the Strait could shave off up to 2 million barrels a day from world supply, a shock that would reverberate through the market for weeks.

Implications for inflation and monetary policy

Higher oil prices feed directly into headline inflation, a key metric for central banks. The UK’s Office for National Statistics projects that a sustained $100‑plus barrel price could lift the consumer price index by 0.2‑0.3 percentage points in the next quarter.

London’s Bank of England, which has been signalling a cautious approach to rate hikes, may now face pressure to accelerate tightening. Similar dynamics are playing out in the United States, where the Federal Reserve has already hinted at a possible rate increase later this month to curb inflationary pressures.

Energy‑dependent economies such as India and Japan are also watching the market closely. Both countries have already signalled that a prolonged oil price surge could dent growth forecasts and force adjustments to fiscal subsidies for fuel.

OPEC+ chairmen have called for restraint, urging all parties to avoid actions that could further destabilise the market. Meanwhile, the US Energy Department warned that “any disruption to the Strait of Hormuz would have immediate repercussions for global supply chains.”

For consumers, the impact will likely be felt at the pump and in grocery bills, as transport costs feed through the supply chain. Retail analysts predict that gasoline prices in the UK could climb by up to 7p per litre in the coming weeks.

The coming days will test whether the price spike is a short‑lived reaction to the latest flare‑up or the start of a longer‑term upward trend driven by sustained geopolitical tension.