Healthcare of Ontario Pension Plan, an independent provider of pensions specifically tailored to Ontario's healthcare sector, and AustralianSuper, a fund, agreed to acquire a 45% stake in Greencross, an operator a chain of veterinary clinics, from TPG. a private equity firm, for $1.17bn. “Both AustralianSuper and HOOPP are high calibre shareholders and their decision to invest in our business is an affirmation of the quality of our team, our strategy and our long-term vision," George Wahby, Greencross CEO.