Keller plc shares rallied 16.7%, closing at 3,128.96p, after the specialist geotechnical contractor published a trading update for the first half of 2026 that substantially exceeded market expectations. Management said full-year revenue and underlying operating profit are now expected to be materially ahead of the prevailing consensus of £3.15bn in revenue and £223m in underlying operating profit.
The firm attributed the upside predominantly to stronger trading in North America, where a pronounced increase in data centre construction and infrastructure activity lifted volumes well beyond its earlier forecasts. Keller also reported a record order book of £1.9bn, which the company said provides enhanced forward visibility for future activity.
Analyst responses were swift. Berenberg lifted its price target to GBP 31.50 from GBP 25.50 while keeping a Buy rating. RBC Capital moved Keller from Sector Perform to Outperform, increased its price target to GBP 31.00 from GBP 22.70 and raised adjusted EPS estimates for fiscal years 2026 through 2028. Those broker actions, combined with the companys upgraded outlook, created a reinforcing dynamic that propelled the stock to an intraday 52-week high of 3,142p.
The wider UK equity market offered little support for the move. The FTSE 250 - the mid-cap index that includes Keller - was expected to trade in a range close to its prior close near 23,538 points, while the FTSE 100 was forecast to open only marginally higher. In that context, Kellers surge was driven primarily by company-specific developments rather than a broad market rally.
Macroeconomic indicators cited in the trading update environment remained modestly cautious. Inflation is running at 2.80% and the Bank of England base rate is set at 3.75%, conditions that leave limited scope for substantive monetary easing that could otherwise provide a broader boost to construction-sector equities.
Market participants described the price action as a classic company-specific re-rating: an unscheduled, materially positive trading update released ahead of the scheduled H1 results on August 4 took the market by surprise and necessitated a rapid reassessment of Kellers valuation. With analyst targets revised sharply upward and the stock approaching its revised 52-week high, the companys exposure to North American data centre and infrastructure buildouts has become a notable differentiator for its outlook.
Investors should note that the recent move appears concentrated around the companys operational beat, the size of its order book and concurrent broker endorsements rather than a broad shift in UK market or macro conditions.