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Costain Group PLC (GB:COST)
LSE:COST

Costain (COST) AI Stock Analysis

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GB:COST

Costain

(LSE:COST)

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Outperform 78 (OpenAI - 5.2)
Rating:78Outperform
Price Target:
230.00 p
▲(25.96% Upside)
Action:ReiteratedDate:03/12/26
The score is driven primarily by improved financial stability and earnings quality (higher margins, low leverage, solid cash conversion), supported by strong technical uptrend signals. Valuation is reasonable but not deeply compelling, and the key risk tempering the score is the multi-year revenue contraction, which could limit future growth if it persists.
Positive Factors
Balance-sheet strength
Very low leverage and rising equity after the turnaround provide durable financial flexibility. This reduces refinancing and covenant risk, supports bidding on large public programmes, and gives headroom to absorb delivery overruns or invest in capabilities over the next 2–6 months.
Cash generation / FCF conversion
High FCF-to-net-income conversion and consistent operating cash flows strengthen liquidity and fund operations without heavy external financing. This supports sustainable project delivery, working-capital needs, and selective reinvestment or shareholder distributions over the medium term.
Improving profitability & margins
Material margin recovery since the loss years signals better project selection, pricing discipline and cost control. Sustained higher margins improve earnings quality and ROE, making future profits less dependent on volume and more resilient to moderate revenue swings.
Negative Factors
Multi-year revenue decline
A prolonged top-line contraction erodes scale benefits and can cap future margin expansion. If revenue trends persist, it could limit reinvestment, reduce bidding competitiveness on large frameworks, and ultimately pressure returns and the durability of the recent turnaround.
Earnings tied to mix, not volume
Profitability gains appear partly driven by improved mix and cost actions rather than sustained revenue growth. That makes earnings vulnerable if higher-margin work lapses or mix shifts, meaning margins could reverse absent a recovery in underlying contract volumes.
Historical cash-flow volatility
Despite recent strong FCF, past negative OCF shows sensitivity to project timing, working capital and client payments. Recurring volatility can strain liquidity around large programme deliveries and limit predictable capital allocation over the medium term.

Costain (COST) vs. iShares MSCI United Kingdom ETF (EWC)

Costain Business Overview & Revenue Model

Company DescriptionCostain Group PLC provides smart infrastructure solutions for the energy, water, transportation, and defense markets in the United Kingdom. The company operates through two segments, Transportation and Natural Resources. The Transportation segment operates in the road, rail, and integrated transport markets. The Natural Resources segment operates in the water, energy, and defense markets. It offers future shaping strategic consultancy, consultancy and advisory, digital technology, asset optimization, and complex program delivery solutions and services. The company was founded in 1865 and is headquartered in Maidenhead, the United Kingdom.
How the Company Makes MoneyCostain primarily makes money by winning and delivering contracts to design, manage, and deliver infrastructure projects and long-term programmes for government bodies, regulated utilities, and other large infrastructure owners/operators. Revenue is generated through (1) project and programme delivery services, where the company is paid for engineering, construction management, systems integration, and delivery of defined works packages; and (2) longer-term service/operational support arrangements, where it provides asset support, maintenance, and performance improvement services over multi-year periods. Depending on the specific contract structure, earnings may come from reimbursable project costs plus a fee/margin, fixed-price or target-cost arrangements with incentives/penalties tied to cost, schedule, safety, and performance outcomes, and time-and-materials or service-fee based arrangements for consultancy and support. Costain’s results are influenced by its ability to maintain a strong order book, manage delivery risk (cost overruns, delays, and contract performance), and secure repeat work from strategic frameworks and alliance-style delivery models used in UK infrastructure markets. Specific significant partnerships or client names: null.

Costain Financial Statement Overview

Summary
Strong post-2021 turnaround with consistent profitability (2022–2025), improving margins, low leverage (debt-to-equity ~0.10 in 2024–2025), and solid cash generation with high FCF-to-net-income conversion. The main constraint is a three-year revenue decline (2023–2025), including a sharper drop in 2025, which raises risk to sustained earnings growth.
Income Statement
74
Positive
Profitability has improved materially since the 2020–2021 loss period, with the business now delivering consistent positive earnings (2022–2025) and steadily stronger margins (gross margin ~3.4% in 2021 to ~10.8% in 2025; net margin ~2.4% in 2024 to ~3.6% in 2025). However, revenue has contracted for three straight years (2023–2025), including a sharper decline in 2025, which tempers the quality of the earnings recovery and signals potential demand or project mix headwinds.
Balance Sheet
82
Very Positive
The balance sheet looks conservatively positioned with low leverage: debt is modest and the debt-to-equity ratio has improved significantly from 2020–2021 to ~0.10 in 2024–2025. Equity has grown over time and returns on equity are healthy in recent years (roughly 10%–14% from 2023–2025), supporting the view that the turnaround has been accompanied by improved capital efficiency. The main drawback is that balance-sheet strength does not fully offset the top-line decline, which can pressure returns if it persists.
Cash Flow
78
Positive
Cash generation is solid and has strengthened recently, with operating cash flow positive in each of the last five years and a notable rebound in 2025. Free cash flow is also strong and closely tracks earnings (free cash flow running at ~87%–100% of net income from 2021–2025), which supports earnings quality. That said, cash flow has been somewhat volatile historically (including negative operating cash flow and free cash flow in 2020), and year-to-year free cash flow growth has been uneven despite the strong 2025 jump.
BreakdownDec 2025Dec 2024Dec 2023Dec 2022Dec 2021
Income Statement
Total Revenue1.05B1.25B1.33B1.42B1.14B
Gross Profit112.70M103.30M103.50M82.20M39.10M
EBITDA60.00M52.60M50.90M47.20M4.60M
Net Income37.30M30.60M22.10M25.90M-5.80M
Balance Sheet
Total Assets561.90M547.20M468.60M482.20M532.40M
Cash, Cash Equivalents and Short-Term Investments215.30M158.50M164.40M123.80M159.40M
Total Debt25.00M25.80M24.30M29.50M66.20M
Total Liabilities303.70M311.50M249.20M271.00M333.40M
Stockholders Equity258.20M235.70M219.40M211.20M199.00M
Cash Flow
Free Cash Flow49.90M37.20M55.60M13.60M27.30M
Operating Cash Flow51.30M42.70M55.70M14.10M29.50M
Investing Cash Flow-2.80M-9.00M-100.00K-1.30M-2.20M
Financing Cash Flow-30.10M-25.60M-15.00M-48.40M-18.80M

Costain Technical Analysis

Technical Analysis Sentiment
Neutral
Last Price182.60
Price Trends
50DMA
180.61
Positive
100DMA
167.59
Positive
200DMA
155.79
Positive
Market Momentum
MACD
1.81
Positive
RSI
46.90
Neutral
STOCH
41.07
Neutral
Evaluating momentum and price trends is crucial in stock analysis to make informed investment decisions. For GB:COST, the sentiment is Neutral. The current price of 182.6 is below the 20-day moving average (MA) of 186.62, above the 50-day MA of 180.61, and above the 200-day MA of 155.79, indicating a neutral trend. The MACD of 1.81 indicates Positive momentum. The RSI at 46.90 is Neutral, neither overbought nor oversold. The STOCH value of 41.07 is Neutral, not indicating any strong overbought or oversold conditions. Overall, these indicators collectively point to a Neutral sentiment for GB:COST.

Costain Peers Comparison

Overall Rating
UnderperformOutperform
Sector (63)
Financial Indicators
Name
Overall Rating
Market Cap
P/E Ratio
ROE
Dividend Yield
Revenue Growth
EPS Growth
80
Outperform
£1.36B8.2323.46%3.08%-1.17%12.31%
78
Outperform
£486.73M11.4913.06%1.88%-12.98%5.51%
73
Outperform
£1.98B12.5024.53%2.49%6.93%21.50%
72
Outperform
£501.42M7.1027.48%3.65%5.78%-6.80%
71
Outperform
£3.55B13.4916.34%1.80%9.97%-15.46%
71
Outperform
£866.35M9.8111.69%3.19%4.40%31.59%
63
Neutral
$10.79B15.437.44%2.01%2.89%-14.66%
* Industrials Sector Average
Performance Comparison
Ticker
Company Name
Price
Change
% Change
GB:COST
Costain
182.60
78.91
76.09%
GB:BBY
Balfour Beatty
745.00
303.16
68.61%
GB:GFRD
Galliford Try
510.00
179.09
54.12%
GB:KLR
Keller Group plc
1,980.00
660.34
50.04%
GB:KIE
Kier Group plc
203.50
85.29
72.15%
GB:MGNS
Morgan Sindall
4,210.00
1,283.14
43.84%

Costain Corporate Events

Business Operations and StrategyStock Buyback
Costain launches £20m share buyback after pension overhaul
Positive
Mar 10, 2026

Costain Group has launched an on-market share buyback of up to £20m, following a recent overhaul of its pension arrangements that removed constraints on shareholder distributions. The board says the programme is a value-enhancing use of surplus cash that preserves financial flexibility to invest in its growth strategy while leaving the existing dividend policy unchanged.

The buyback, to be executed in two £10m tranches by Panmure Liberum and Investec acting as riskless principals, could see the company repurchase up to 20,481,508 shares for cancellation, reducing its share capital from the current 266,714,895 shares. The second tranche is expected to complete by the end of 2026 subject to market conditions, and the company cautions there is no guarantee the full amount will be deployed or that all authorised shares will be bought back.

Purchases will be made on the open market under the authority granted at the 2025 AGM and in line with UK listing and market abuse regulations, with transactions disclosed within seven market sessions. The move underscores Costain’s confidence in its cash generation and capital position, signalling a stronger focus on capital returns that could support the share price while maintaining funding capacity for its infrastructure-focused growth plans.

The most recent analyst rating on (GB:COST) stock is a Buy with a £206.00 price target. To see the full list of analyst forecasts on Costain stock, see the GB:COST Stock Forecast page.

Business Operations and StrategyStock BuybackDividendsFinancial Disclosures
Costain boosts profits, cash and shareholder returns on record £7bn order book
Positive
Mar 10, 2026

Costain reported another year of profit growth despite lower revenue, with adjusted operating profit up 9.3% to £47.1m and margins improving to 4.5% as it exited lower-margin road contracts and benefited from strong performances in natural resources and integrated transport. Net cash rose to £189.3m on robust free cash flow, enabling a higher dividend and further share buybacks as the group returns to the FTSE 250.

The company’s forward work position climbed 30% to a record £7bn, nearly seven times annual revenue, driven by contract wins and extensions across all sectors, giving strong visibility on future workloads. Management said this pipeline, combined with growth opportunities from the UK’s 10-year infrastructure strategy in water, energy and aviation, underpins expectations for continued revenue and profit growth in 2026 and a step change in performance from 2027 onward.

The most recent analyst rating on (GB:COST) stock is a Buy with a £206.00 price target. To see the full list of analyst forecasts on Costain stock, see the GB:COST Stock Forecast page.

Business Operations and StrategyStock BuybackDividendsFinancial Disclosures
Costain lifts profits and cash as record £7bn order book fuels shareholder payouts
Positive
Mar 10, 2026

Costain reported a strong full-year 2025 performance, with adjusted operating profit up 9.3% to £47.1m and margins rising to 4.5%, despite a 16.4% revenue decline to £1,045.7m as legacy road contracts completed and HS2 work was rescheduled. Growth in natural resources, improved contract mix and lower adjusting items lifted reported operating profit by 44.1% and boosted earnings, while robust cash generation increased net cash to £189.3m.

The company’s forward work position surged 30% to a record £7bn, nearly seven times annual revenue, supported by contract wins and extensions across all sectors and growing activity at Heathrow. This strengthened backlog, combined with solid cash flow, underpins higher shareholder returns through a larger dividend and a £20m share buyback in 2026 and is expected to support revenue and profit growth, reinforcing Costain’s position as a key beneficiary of the UK’s long-term infrastructure spending plans.

The most recent analyst rating on (GB:COST) stock is a Buy with a £206.00 price target. To see the full list of analyst forecasts on Costain stock, see the GB:COST Stock Forecast page.

Executive/Board Changes
Costain chair Kate Rock takes senior independent role at Chemring
Positive
Mar 4, 2026

Costain Group PLC has announced that its Non-Executive Chair and Chair of the Nomination Committee, Kate Rock, has been appointed as an Independent Non-Executive Director at Chemring Group PLC, effective 1 April 2026. Upon joining the London-listed defence technology company, she will also serve as Senior Independent Director and sit on Chemring’s Audit, Nomination and Remuneration Committees, signalling an expanded governance role for Rock while she continues to lead Costain’s board.

The cross-board appointment underscores the growing demand for experienced non-executive leadership across UK-listed industrial and engineering groups, and may enhance Costain’s boardroom connectivity and insight into adjacent sectors such as defence and technology. For stakeholders, the move highlights the increasing emphasis on robust governance and committee oversight at both companies, though Costain has not indicated any changes to Rock’s responsibilities within its own leadership structure.

The most recent analyst rating on (GB:COST) stock is a Buy with a £206.00 price target. To see the full list of analyst forecasts on Costain stock, see the GB:COST Stock Forecast page.

Business Operations and StrategyDelistings and Listing ChangesFinancial Disclosures
Costain Reclaims FTSE 250 Spot After Two-Decade Absence
Positive
Mar 2, 2026

Costain Group has rejoined the FTSE 250 index for the first time in more than two decades, reflecting sustained improvement in its financial performance. The company cites increased profitability, positive cash generation and a growing pipeline of high-quality work in its target markets as key drivers behind its renewed mid-cap status.

Management framed the index return as a validation of Costain’s long-term strategy and the execution capabilities of its workforce. The move is likely to enhance the group’s visibility among institutional investors and could support further shareholder returns ahead of its forthcoming full-year 2025 results.

The most recent analyst rating on (GB:COST) stock is a Buy with a £206.00 price target. To see the full list of analyst forecasts on Costain stock, see the GB:COST Stock Forecast page.

Business Operations and StrategyExecutive/Board Changes
Costain discloses external board moves of non-executive director Fiona MacAulay
Neutral
Feb 24, 2026

Costain has announced board changes involving non-executive director Fiona MacAulay, who also serves as chair of its remuneration committee and sits on its audit, risk and nomination committees. MacAulay has retired from the board of defence technology company Chemring Group after choosing not to seek re-election at its annual general meeting on 20 February 2026.

Costain also disclosed that, following the merger of Dowlais Group into U.S.-based Dauch Corporation, MacAulay has joined the combined group as an independent director. Her appointment to the dual London and New York-listed Dauch board under UK listing rules underscores her growing external governance profile while maintaining her non-executive responsibilities at Costain.

The most recent analyst rating on (GB:COST) stock is a Buy with a £206.00 price target. To see the full list of analyst forecasts on Costain stock, see the GB:COST Stock Forecast page.

Business Operations and StrategyFinancial Disclosures
Costain schedules investor Q&A on 2025 full-year results
Neutral
Feb 9, 2026

Costain Group has scheduled an investor Q&A session to discuss its full-year 2025 results, to be hosted by chief executive Alex Vaughan and chief financial officer Helen Willis via the Investor Meet Company platform on 11 March 2026. The event, open to existing and potential shareholders, allows questions to be submitted in advance or during the live presentation, underscoring Costain’s efforts to enhance transparency and engagement with the investment community as it prepares to publish its 2025 results on 10 March 2026.

The most recent analyst rating on (GB:COST) stock is a Buy with a £206.00 price target. To see the full list of analyst forecasts on Costain stock, see the GB:COST Stock Forecast page.

Business Operations and Strategy
Costain wins £100m contract for new M5 junction serving UK EV gigafactory
Positive
Jan 27, 2026

Costain Group has secured a contract worth about £100m over five years to design and build a new M5 motorway junction, 22A, in Somerset, awarded through the Regional Delivery Partnership framework. The junction will provide access to the Gravity Smart Campus and Agratas’s planned £4bn gigafactory, set to be Britain’s largest electric vehicle battery manufacturing facility, positioning Costain as delivery integration partner and main works contractor responsible for design, engineering, programme delivery and supply chain management, and underlining its role in critical national infrastructure that supports regional economic growth and the UK’s clean-energy industrial ambitions.

The most recent analyst rating on (GB:COST) stock is a Buy with a £197.00 price target. To see the full list of analyst forecasts on Costain stock, see the GB:COST Stock Forecast page.

Business Operations and StrategyStock BuybackDividendsFinancial Disclosures
Costain frees up capital for higher shareholder returns after pension deal and strong FY25 trading
Positive
Jan 26, 2026

Costain has reached a new agreement on its defined benefit pension scheme that removes a long‑standing dividend parity constraint and eliminates the need for further cash contributions until 2031, freeing up capital to enhance shareholder returns. In light of a strong balance sheet, surplus in the scheme and robust trading in FY 25, the board intends to move to a 3.0x dividend cover policy that would almost double cash dividends in FY 26 and to launch a £20m share buyback next year, while continuing to review the capital structure for potential additional returns. Operationally, FY 25 performance is expected to be in line with market profit expectations, with adjusted operating margins exceeding the 4.5% target and year-end net cash of £190m ahead of consensus, supported by timing benefits in working capital. The company has also secured a series of significant long-term contracts, including a utilities delivery partner role for Sellafield worth up to £1bn over 15 years and major nuclear and highways work, underpinning management’s confidence in further progress in FY 26 and a ‘step change’ in performance from FY 27 onwards.

The most recent analyst rating on (GB:COST) stock is a Buy with a £177.00 price target. To see the full list of analyst forecasts on Costain stock, see the GB:COST Stock Forecast page.

Business Operations and StrategyFinancial Disclosures
Costain Sets Dates for 2025 Trading Update and Full-Year Results
Neutral
Dec 19, 2025

Costain Group has scheduled a trading update for the year ending 31 December 2025 to be released on 26 January 2026, with full-year results to follow on 10 March 2026. The timetable underlines the company’s efforts to provide timely visibility on its financial performance to investors and other stakeholders as it pursues its strategy of delivering sustainable infrastructure solutions across key UK sectors.

The most recent analyst rating on (GB:COST) stock is a Buy with a £177.00 price target. To see the full list of analyst forecasts on Costain stock, see the GB:COST Stock Forecast page.

Glossary
BuyA stock rated as a "Buy" is expected to perform better than the overall market or a specific benchmark over the near-to-medium term. This rating suggests the stock is likely to deliver higher returns compared to other stocks in the same sector or market index. Note: This is not investment advice; please consult a financial advisor before making investment decisions.
HoldA stock rated as a "Hold" is expected to perform in line with the overall market or a specific benchmark. This rating indicates that the stock is neither particularly compelling nor unfavorable for investment. Note: This is not investment advice; please consult a financial advisor before making investment decisions.
SellA stock rated as a "Sell" is expected to perform worse than the overall market or a specific benchmark over the near-to-medium term. This rating suggests the stock may deliver lower returns compared to other stocks in the same sector or market index. Note: This is not investment advice; please consult a financial advisor before making investment decisions.

Disclaimer

This AI Analyst Stock Report is automatically generated by our AI systems using advanced algorithms and publicly available financial, technical, and market data. While the information provided aims to be accurate and insightful, it is intended for informational purposes only and should not be considered financial advice. Any content created by an AI (Artificial Intelligence) system may contain inaccuracies and/or contain errors. Investing in stocks carries inherent risks, and past performance is not indicative of future results. This report does not account for your personal financial circumstances, objectives, or risk tolerance. Always conduct your own research or consult with a qualified financial advisor before making investment decisions. The analysis and recommendations provided are based on historical and current data and may not fully reflect future market conditions or unexpected developments. Neither the creators of this report nor its affiliated entities guarantee the accuracy, completeness, or reliability of the information presented. Use this report at your own discretion and risk.Date of analysis: Mar 12, 2026