Carillion plc (LSE: CLLN) is a British-based construction-services business headquartered in Wolverhampton, West Midlands.

It is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index.

Carillion was created in July 1999 by a demerger from Tarmac, which was founded in 1903.

In September 2001, Carillion acquired the 51% of GT Rail Maintenance it did not already own thereby creating Carillion Rail. In August 2002, Carillion bought Citex Management Services for £11.5 million. Then in March 2005, Carillion acquired Planned Maintenance Group for circa £40 million. After that, in February 2006, Carillion went on to acquire Mowlem, another UK support-services firm, for circa £350 million and in February 2008, Carillion acquired Alfred McAlpine, another UK support-services firm, for £572 million.

Source: Wikipedia