Kildare-based Bernard Murphy (74) and family own this UK-based construction firm, where it works on major infrastructure projects including tunnels, bridges, pipelines, water and railway projects such as London's Crossrail. The firm also has operations in Canada and in this country.
The business, which has an iconic green logo, was established by Kerryman John Murphy in 1951 after his arrival in London in the 1930s, where he worked clearing bombed-out sites and rebuilding airfields.
Today it employs several thousand people and booked revenues of €809m in 2017, with a profit of €13.4m. There is an Isle of Man company which overarches the entire corporate structure.
The firm also has extensive property interests valued at €230m, mainly in north London, but is also developing a mixed-use project between Shoreditch and Liverpool Street, on the edge of the City business district. The assets generated a profit of €27.5m in 2017.