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An announcement from Costain ( (GB:COST) ) is now available.
Costain Group PLC has continued to execute its previously announced share buyback programme, repurchasing 359,777 ordinary shares between 18 and 24 March 2026 on the London Stock Exchange at volume-weighted average prices ranging from about 178 pence to 191 pence. The company plans to cancel these shares, bringing total repurchases under the programme to 517,878 ordinary shares and reducing the number of shares in issue to 266,197,017, a move that marginally enhances earnings per share and signals ongoing confidence in its capital position.
The latest tranche of purchases was carried out through broker Panmure Liberum across multiple trading venues, with detailed trade data disclosed in line with UK Market Abuse Regulation requirements. By shrinking its share capital while holding no shares in treasury, Costain is tightening its equity base, which may support shareholder value and underlines active capital management at a time when investors are closely watching infrastructure contractors’ balance-sheet discipline.
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 UK-based engineering and construction group that delivers infrastructure solutions across sectors such as transportation, water, energy and defence. The company focuses on complex infrastructure projects, combining consulting, design, construction and technology-led services for public and private sector clients.
Average Trading Volume: 1,492,204
Technical Sentiment Signal: Buy
Current Market Cap: £496.9M
For an in-depth examination of COST stock, go to TipRanks’ Overview page.

