Company summary
Costain is a UK infrastructure engineering and construction group. It provides consultancy, design, programme management and complex project delivery across transport, water, energy and defence.
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COST
Costain Group
Engineering and Construction
- Index
- FTSE 250
- ISIN
- Not specified
- Book status
- 2026 edition — current
Key activities
Engineering consultancy, project and programme management, construction, infrastructure upgrades, maintenance and specialist technical services for major public and regulated infrastructure customers.
Key markets
The United Kingdom, particularly National Highways, rail and transport authorities, water companies, energy and nuclear operators and government defence clients.
Key drivers
UK infrastructure investment, AMP8 water spending, transport programmes, energy transition and nuclear work, defence investment, contract wins, margins and conversion of the forward work position into revenue.
Key risks
Project execution, fixed-price contract exposure, delays in public spending, skilled-labour shortages, customer concentration, cost inflation, working-capital swings and disputes on complex infrastructure contracts.
Recent Developments
15 July 2026: Costain secured a three-year extension to its United Utilities managed-services contract, extending the partnership to ten years and supporting AMP8 water and wastewater investment across North West England.
Dividend notes
Pays interim and final dividends. The 2025 final dividend of 3.2p went ex-dividend on 16 April 2026 and was paid on 26 May. The 2026 interim dividend should be checked against the August half-year results once the full timetable is published.
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