Caisse de dépôt et placement du Québec and French private equity firm Ardian have acquired a “significant” stake in Alvest SAS, a Paris-based developer, producer, distributor and supporter of airport ground support equipment. No financial terms were disclosed. The seller of the interest was Sagard Private Equity Partners, which acquired Alvest in 2015. Established in 2006, Alvest operates 10 factories in the United States, Canada, France and China. Stéphane Etroy, executive vice president and head of private equity at the Caisse, said the Canadian pension fund and Ardian will back the company’s future growth in new and existing markets.