Stock Markets March 18, 2026 01:05 PM

London Market Closes Lower as Mining, Autos and Tobacco Stocks Weigh on Index

Investing.com United Kingdom 100 falls 0.90% as Diploma hits record high while several large-cap names lose ground

By Leila Farooq
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U.K. equities finished lower on Wednesday, with the Investing.com United Kingdom 100 ending the session down 0.90%. Losses were concentrated in the Mining, Automobiles & Parts and Tobacco sectors. Diploma PLC recorded a substantial gain and reached an all-time high, while 3I Group and WPP moved to multi-period lows. Commodity and currency moves were mixed, with gold down sharply and oil prices higher.

London Market Closes Lower as Mining, Autos and Tobacco Stocks Weigh on Index
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Key Points

  • Investing.com United Kingdom 100 closed down 0.90%, led lower by losses in Mining, Automobiles & Parts and Tobacco sectors.
  • Diploma PLC surged 17.80% to an all-time high, while 3I Group and WPP fell to 52-week and five-year lows respectively, highlighting divergence among large caps.
  • Commodities were mixed: gold futures dropped 2.35%, while May crude and Brent oil rose 1.72% and 4.91% respectively; currency moves were modest.

U.K. stocks closed lower on Wednesday as sector-level weakness in Mining, Automobiles & Parts and Tobacco pushed the benchmark down. At the close in London, the Investing.com United Kingdom 100 slipped 0.90%.

Market breadth on the London Stock Exchange tilted negative, with decliners outnumbering advancers by 1,043 to 771; 489 stocks finished unchanged.

Top performers

  • Diploma PLC (LON:DPLM) led gains, jumping 17.80% or 895.09 points to close at 5,925.09. The share price reached an all-time high during the session.
  • Weir Group PLC (LON:WEIR) added 2.03% or 58.00 points to finish at 2,920.00.
  • Standard Chartered PLC (LON:STAN) rose 1.68% or 27.00 points to end the day at 1,630.50.

Lagging stocks

  • 3I Group PLC (LON:III) was the weakest name listed, falling 4.80% or 145.00 points to 2,875.00 and registering a 52-week low.
  • Compass Group PLC (LON:CPG) declined 4.54% or 103.00 points to close at 2,164.00.
  • WPP PLC (LON:WPP) slid 4.09% or 9.70 points to 227.40, a move that marked a five-year low for the stock.

The session included notable intra-market milestones: Diploma’s shares reached an all-time peak, 3I Group traded down to its 52-week low, and WPP moved to a five-year low.

Commodities and currencies

Gold futures for April delivery fell 2.35% or 117.94 to $4,890.26 a troy ounce. In energy markets, crude oil for May delivery climbed 1.72% or $1.64 to $97.17 a barrel, while the May Brent contract rose 4.91% or $5.08 to $108.50 a barrel.

Currency moves were modest: GBP/USD was essentially unchanged at 1.33, moving 0.20%, while EUR/GBP was unchanged, shifting 0.09% to 0.86. The US Dollar Index Futures closed up 0.31% at 99.64.


This trading day reflected a divergence between select large-cap winners and broader market weakness, and left several stocks testing long-term support levels while commodities showed mixed directionality.

Risks

  • Sector concentration risk: losses concentrated in Mining, Automobiles & Parts and Tobacco could weigh further on sector-exposed portfolios.
  • Company-specific downside: several large-cap stocks moved to extended lows, introducing uncertainty for investors exposed to those names.
  • Commodity volatility: sharp moves in gold and notable gains in oil introduce market sensitivity that can affect broader equity sentiment.

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