Andrew Davies will step down as chief executive of UK construction property services firm Wates Group to join Carillion as its new boss on 22 January, instead of 2 April as announced in October.
Shares rose 1.5% to 16.50p in morning trading.
READ: Carillion inks definitive sale agreement for disposal of bulk of its UK healthcare facilities business
Carillion chairman Philip Green said: "We are very grateful to the board of Wates Group and to James Wates CBE, their chairman, for their facilitation of Andrew's earlier appointment. It is a demonstration of how the sector is willing to cooperate and collaborate to ensure the long term sustainability of UK industry."
His appointment comes about five months after Richard Howson stepped down as chief executive as the company issued a profit warning.
READ: Carillion shares up as stock overhang cleared after biggest shareholder, Kiltearn halves stake
The company has issued three profit warnings this year due to its failure to improve profit margins across UK support service contracts, delays to asset disposals and to the start of a significant project in the Middle East.