London Stock Exchange rises 0.64% on mining gains and lower UK debt

London's stock market closed with a notable gain of 0.64% on Friday, August 21, 2026. The upward trend was primarily fueled by strong performance in the mining sector and positive news regarding British national debt.

The FTSE 100 index advanced by 68.40 points, reaching 10,816.56. The secondary FTSE 250 index, which comprises smaller, typically British companies, also saw a substantial increase of 0.86%, closing at 24,718.82. This positive movement occurred despite the overall high levels of British national debt, which stood at 94.1% of the UK's gross domestic product (GDP) at the end of July. This figure represents a decrease of 0.8% from the previous month, according to the UK's Office for National Statistics.

Among the day's top performers was sportswear retailer JD Sports, which surged 5.57%. This recovery followed a significant drop of over 14% in the previous session after the company revised its profit forecasts downward. The mining sector was a major contributor to the day's gains, with companies like Antofagasta and Endeavour Mining rising by 5.37% and 4.09%, respectively.

Conversely, some companies experienced declines. Energy firm National Grid lost 1.31%, while military contractors Melrose Industries and Babcock International fell by 1.26% and 1.21%, respectively. These movements highlight the varied performance across different sectors of the London stock market.