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Guides Aug 18, 2026

Why Is the UK Stock Market Down Today? FTSE 100 Faces Pressure as Oil Rises Above $91

UK Stock Market Down: The UK stock market remained under pressure on Tuesday, August 18, with the FTSE 100 struggling to recover after six consecutive sessions of losses. Rising crude oil prices, renewed geopolitical concerns and persistent inflation worries continued to weigh on investor sentiment. Brent crude moved above $91 a barrel, adding to concerns about higher costs for businesses and consumers.

The weakness comes after the FTSE 100 fell for a sixth straight session on Monday. The index closed at around 10,720, down roughly 0.3%, its lowest level in more than three weeks. The FTSE 250 also declined, falling 0.7% to about 24,704.

Why is the FTSE 100 falling?

The biggest concern for investors is the sharp rise in oil prices. Brent crude climbed above $91 a barrel as uncertainty surrounding the Middle East and disruptions to oil supplies increased. Higher energy prices can put fresh pressure on inflation and potentially complicate the outlook for interest rates.

The latest market moves also came against a backdrop of growing concerns over government borrowing costs and inflation. Investors are watching economic data closely for clues about the Bank of England's next policy decisions.

At the same time, the UK labour market has shown signs of cooling, with unemployment at 4.9% and job vacancies continuing to decline. Slower private-sector wage growth could potentially ease some inflation pressure, although higher energy prices remain a major risk.

FTSE 100's six-day losing streak

The latest decline extended a difficult run for London's blue-chip index. On Monday, the FTSE 100 fell 0.28% to close at 10,720.30, marking its sixth consecutive daily decline. Consumer-facing companies were among the biggest drags on the index.

Market data showed Howden Joinery, Diageo and J Sainsbury among the notable decliners on Monday. On the other hand, Endeavour, Anglo American and GSK were among the stronger performers.

Oil prices become a key market trigger

The jump in crude prices has become a central concern for global equity markets. Brent crude approached and moved above the $91 level as the temporary US-Iran ceasefire expired without a lasting agreement. The uncertainty has raised fears of further disruption to energy supplies.

For the UK market, higher oil prices create a mixed picture. Energy companies and some commodity-linked stocks can benefit from higher crude prices, while airlines, retailers and other businesses exposed to fuel and operating costs can face pressure.

Investors watching Bank of England and inflation

Investors are now closely watching inflation data, wage growth and the Bank of England's policy outlook. A sustained rise in energy prices could make the fight against inflation more difficult and reduce expectations for aggressive interest-rate cuts.

At the same time, evidence of a cooling labour market could provide some relief to policymakers. This tension between weaker economic activity and higher energy costs is likely to remain an important theme for UK stocks in the near term.

What investors should watch next

The direction of the FTSE 100 will likely depend on several factors, including crude oil prices, developments in the Middle East, inflation data, UK economic indicators and corporate earnings.

After six straight sessions of losses, investors will be watching closely to see whether the index can stabilize or whether rising energy costs trigger another round of selling pressure.

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