Carillion plc 's a British-based construction-services business headquartered in Wolverhampton, West Midlands. It's listed on the London Stock Exchange and's a constituent of the FTSE 250 Index. History Carillion was created in July 1999 by a demerger from Tarmac, which was founded in 1903. In March 2005, Carillion acquired Planned Maintenance Group for circa £40 million. In February 2006, Carillion went on to acquire Mowlem, another UK support-services firm, for circa £350 million an… (More on Carillion)