Costain Group (COST) Fair Value & Analysis
Industrials · GB · Market cap 513M GBX
Fair value as of: Jun 24, 2026
From 24 valuation models · updated 5 days ago
Fair value updated Jun 24, 2026 — revised from £2.88 to £3.00 (+4.2%) since Jun 23, 2026. Share price +6.0% over the past month.
Price vs Fair Value (12 months)
12‑month range £1.24 – £2.13 · fair‑value band £2.31 – £3.69 · the £2.06 price screens below the £3.00 fair value. As of Jun 24, 2026.
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Costain Group (COST) currently trades at £2.06, while our model-based Fair Value estimate is £3.00 — implying the stock looks roughly 45.6% undervalued today. We read business quality at 95/100 (high quality), in the Industrials sector. Bull case: trading below our estimate, it may offer upside if the fundamentals hold. Bear case: a low price can be a value trap when quality is weak or the data is thin (evidence: high) — always confirm before acting.
Over the trailing twelve months, Costain Group generated revenue of £1.0B at a net margin of 3.6%. Revenue declined 15.0% year over year. It earns a return on equity of 15.1%. The balance sheet holds a net cash position of £190M. Fundamentals as of Jun 24, 2026
Key figures & financial health
More key figures
Figures from reported company fundamentals (EODHD) · as of Jun 24, 2026. TTM = trailing twelve months.
About the company
Costain Group PLC provides infrastructure solutions for the transportation, energy, water, and defense sectors in the United Kingdom. The company operates in two segments, Transportation and Natural Resources. It operates in the road, rail, and integrated transport markets, as well as in the water, energy, defense, and nuclear energy markets. The company also provides engineering, construction, maintenance, renewals, advisory, design, and consulting services, as well as solutions. Costain Group PLC was founded in 1865 and is headquartered in London, the United Kingdom.
Revenue & earnings trend
FY2021 – FY2025 · reported fiscal years
Costain Group reported revenue of £1.0B in FY2025 versus £1.1B in FY2021, a compound −2.0%/yr. Reported net income was £37.3M in FY2025.
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How we calculate Fair Value
Each company is valued through a stack of independent intrinsic-value models (DCF variants, residual-income, multiples and more), blended into one family-balanced consensus and weighted by how much trustworthy data backs it. A separate quality layer scores the fundamentals. Every input is real reported data — nothing guessed.
Educational research only · not financial advice · no buy/sell recommendation. Model-based estimates are not certainties; their reliability depends on data quality and assumptions.