Costain chair Kate Rock increases stake with share purchase

Costain ( (GB:COST) ) has issued an update.

Costain Group PLC has disclosed that its non-executive chair, Kate Rock, acquired 10,000 ordinary shares in the company at £1.822 per share on 31 March 2026. Following this purchase, Rock’s total holding has risen to 135,000 shares, representing approximately 0.05% of Costain’s issued share capital.

The transaction, conducted on the London Stock Exchange, underscores further personal financial commitment by the company’s chair and may be interpreted as a signal of confidence in Costain’s prospects. The dealing was notified in accordance with U.K. Market Abuse Regulation requirements for persons discharging managerial responsibilities.

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.-based engineering and construction company focused on infrastructure solutions across transportation, water, energy and defense. The group delivers complex, large-scale projects for public and private sector clients, positioning itself as a key contractor in the U.K. infrastructure and engineering services market.

Average Trading Volume: 1,523,033

Technical Sentiment Signal: Buy

Current Market Cap: £482.9M

See more insights into COST stock on TipRanks’ Stock Analysis page.