The deal follows Ardian buying a 10 per cent stake in CLH in 2011, when the buyout house was known as AXA Private Equity.
Ardian said the purchase was the latest from its third generation Infrastructure Fund, which it added was seeing an exceptionally high number of deal opportunities within European infrastructure.
The firm’s infrastructure team, which manages or advises €3.1bn of assets, recently completed the acquisition of London Luton Airport as well as an investment in Enel Rete Gas.
Ardian head of infrastructure Mathias Burghardt said, “The investments recently completed by our team demonstrate the quality of the current European deal pipeline in infrastructure.
“We will continue to focus on core infrastructure assets and securing proprietary deal flow through our extensive European network.
“This additional investment in CLH is further evidence of Ardian’s long-term commitment to supporting quality and successful companies.
“CLH is one of the largest and most technologically advanced private companies in the sector.
“We look forward to working together with the management and other shareholders to continue to help CLH reach its ambitious development targets.”
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