Up to 1,500 staff employed by the £65m turnover John Laing Integrated Services have transferred over to Carillion.
Adrian Ewer, Chief Executive of John Laing, said: “Our decision to dispose of JLIS underlines our commitment to our principal investment and asset management activities.
“JLIS has made significant progress over the last few years, but it no longer fits within our core strategy.
“We are confident that under its new ownership, the business will see future growth within the public sector and benefit from being a part of an integrated support services company.”