Leighton was founded in 1949, listed on the Australian Securities Exchange in 1962 and is based in Sydney, Australia. The Group owned and operated through a number of diverse and independent operating companies: Leighton Contractors; Thiess; John Holland; Leighton Asia, India and Offshore; and Leighton Properties. Some of these Operating Companies have been in existence since the 1930s. The Leighton Group also had a 45% investment in the Habtoor Leighton Group. In April 2015 Leighton Holdings changed its name to CIMIC Group following the sale of its John Holland subsidiary.
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