Read More General business news Costain Group (LSE: COST) raises dividend 75%, launches £20m buyback as FTSE 250 return underlines turnaround Costain Group COST reports record GBP7bn forward work, 4.5% operating margin, and a GBP20m buyback. Read our full FY 2025 executive analysis. byVenkateshMarch 16, 2026