Just before Christmas in 2017, management at Mercury Engineering finalised a deal to acquire the country’s largest mechanical and electrical contractors from the family of its founder Frank O’Kane. The purchase price was not disclosed, but documents filed at the Companies Registration Office later showed that Mercury Enterprises, a new company based in the Isle of Man, invested €147.4 million cash in Mercury Holdings, the parent company of the engineering group, on December 19. For that, Mercury Enterprises has acquired the entire share capital of the group apart from one deferred share. Four years later, it is looing liked an…