The pair have controlled ISS for almost a decade following a €3bn buyout deal in 2005.
Goldman Sachs and UBS are leading the IPO of ISS, which is one of the world’s largest private employers with 530,000 staff.
ISS previously considered listing in 2007 and 2011, but pulled back from the option both times amid turbulent stock market conditions.
EQT held about 55 per cent of the business at the time of the buyout, with Goldman Sachs owning the rest through its private equity arm.
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