The FTSE 100 fell 0.6% to 10,417.63 points on Thursday, pressured by a sharp decline in pharmaceutical heavyweight AstraZeneca following disappointing late-stage trial results for its nerve disease drug Wainua. The domestically focused FTSE 250 edged up 0.1%, reflecting a mixed session across UK equities.

AstraZeneca Leads Pharma Sector Lower

Pharmaceutical stocks were the worst-performing sector, dropping 6.2%, largely due to AstraZeneca's 9.2% slide. The company reported that Wainua, developed in partnership with Ionis, failed to meet its primary endpoint of reducing cardiovascular deaths and recurrent heart-related events in a late-stage trial. Investors reacted swiftly, selling off shares and dragging the broader sector down. For more details, see our coverage: AstraZeneca Shares Tumble 9.5% as Wainua Fails Key Heart Disease Trial.

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Geopolitical Tensions Weigh on Sentiment

Investor caution persisted amid renewed US strikes on Iran, which kept Middle East tensions in focus. Oil prices edged slightly higher, but energy stocks fell 1%, making them one of the weaker sectors. US President Donald Trump downplayed the risk of a full-scale war, helping to limit broader market declines. Market participants continued to monitor geopolitical developments for their potential impact on inflation and interest rate expectations.

Gold Miners Shine on Safe-Haven Demand

Precious metal miners outperformed, gaining 2.6% as gold prices advanced. A weaker US dollar boosted bullion's appeal, while investors sought safe-haven assets amid geopolitical uncertainty. The gains in mining stocks partially offset weakness elsewhere in the market.

Playtech Surges on Strong Outlook

Among mid-caps, Playtech jumped 17.7% after forecasting adjusted core profit for 2026 above market expectations. The gaming company attributed its upbeat outlook to robust growth in the US and Latin America, lifting its shares to the top of the FTSE 250.

Computacenter Rises on AI Infrastructure Demand

Computacenter was a standout on the FTSE 100, rising over 7% after saying it expects annual results to exceed market expectations. The IT services provider cited stronger demand for AI-related infrastructure from hyperscale customers in North America and the UK. The update reinforced confidence in continued enterprise spending on artificial intelligence, helping the stock outperform the broader market. For context on AI-driven market moves, see: Nasdaq Futures Jump 190 Points as Oil Retreats and Chip Stocks Rebound.

Market Outlook

The FTSE 100's decline highlights the impact of sector-specific shocks and geopolitical risks on UK equities. While gold miners and select tech-related stocks provided some support, the broader market remains cautious. Investors will continue to watch for further developments in the Middle East and central bank policy signals. For more on market trends, read: Magnificent 7 Stocks Hit Decade-Low Valuation Premium Over S&P 500.

This article is for informational purposes only and does not constitute financial advice.