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Costain ( (GB:COST) ) has issued an update.
Costain has continued to execute its previously announced share buyback programme, repurchasing 295,681 ordinary shares between 25 and 31 March 2026 on the London Stock Exchange at daily volume-weighted average prices ranging from about 181.66p to 191.22p. The company intends to cancel these shares, as it does not hold any in treasury, signalling an ongoing commitment to returning capital and potentially enhancing earnings per share.
In aggregate, Costain has now bought back 813,559 shares for cancellation under the programme, reducing its total shares in issue to 265,901,336 once the latest purchases settle. The additional reduction in share capital may support the share price and reflects management’s confidence in the business, while modestly increasing existing investors’ proportional ownership in the company.
The most recent analyst rating on (GB:COST) stock is a Hold with a £180.00 price target. To see the full list of analyst forecasts on Costain stock, see the GB:COST Stock Forecast page.
Spark’s Take on COST Stock
According to Spark, TipRanks’ AI Analyst, COST is a Outperform.
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.
To see Spark’s full report on COST stock, click here.
More about Costain
Costain Group PLC is a U.K.-listed engineering and construction company focused on delivering infrastructure solutions. It operates across sectors such as transportation, energy, water and defence, providing complex project delivery and consultancy services to public and private sector clients.
Average Trading Volume: 1,523,033
Technical Sentiment Signal: Buy
Current Market Cap: £482.9M
For detailed information about COST stock, go to TipRanks’ Stock Analysis page.