Kier surged to the top of the February leagues after it bagged two prison jobs worth a combined £800m.
The contractor signed contracts worth a total of £961.9m, more than three times the value of deals won by its nearest competitor, according to construction data provider Glenigan.
Of the 11 contracts Kier signed in February, the largest was a £683.8m job to build the new HMP Glasgow as a replacement for the ageing HMP Barlinnie.
Kier expects to complete the job in 2028, and had been carrying out early works on the site since October. The new prison will have capacity for 1,344 inmates.
The tier one contractor also bagged a second prison job worth £116m last month – to build two houseblocks, a workshop and storage buildings at HMP Lancaster Farms in Lancashire.
Royal Bam and Graham took second and third spots respectively, largely thanks to a £389m job to build a new hospital in Belfast.
The new facility will replace an existing children’s hospital at the city’s Royal Victoria Hospital.
A joint venture between Graham and Bam Ireland, called GBHP, began the five-year job in February. The 10-floor hospital will have 155 beds in total and 10 theatres, plus an emergency department that the Northern Ireland Executive said will be able to treat up to 45,000 children every year.
In total, Royal Bam snapped up six projects in February, with a total value of £281.9m.
That took it above Graham, which secured three jobs valued at £249.2m.
Galliford Try came in at fourth place, with £155m worth of work in February from six jobs. The biggest of those was a £63m contract to build accommodation at RAF Digby in Lincolnshire.
The contractor will build four new three-storey single living accommodation buildings. Each building will contain 69 individual bedrooms.
Galliford Try said the site will feature photovoltaic panels and air source heat pumps. It is also planning a system to recover heat from wastewater.
Vinci took fifth place with five jobs worth a combined £123m, including the first £100m phase of a £350m mixed-use neighbourhood in Stockport.
The work will include demolishing a Stagecoach depot on the site and replacing it with 435 new homes and 880 square metres of commercial space.
Overall, the 10-year regeneration project will deliver more than 1,200 homes and 1,400 square metres of commercial space.
Another JV featured in the February league table. Ferrovial and Alpine BeMo were together named on a £230m job to build a 2.2km-long tunnel for National Grid under the River Thames.
Work is set to last until the first quarter of 2029. The Grain to Tilbury scheme will include two 35-metre-deep shafts, along with headhouses and cable sealing end compounds.
Glenigan has split the value of the contract in half for the purposes of the league tables.
Morgan Sindall continued its dominance of the rolling annual league tables, signing 270 contracts in the year between March 2024 and February 2025. That took it to a total of £2.9bn, just £50m ahead of second-placed Kier, which moved one place up the ranks.
Winvic also moved up one place to fourth, with £1.7bn worth of contracts.
Ferrovial and John Sisk rose one place each to sixth and seventh spots respectively. There were no new additions to the top 10 firms in the rolling annual league table.
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Joshua Stein