Quadrant Private Equity (also simply known as Quadrant) is an Australian private equity investment firm based in Sydney, Australia. The company was founded as Quadrant Capital in 1996 by Chris Hadley.

Quadrant hosts multiple investment funds which invest in businesses across a wide array of industries and sectors, specifically targeting management buyouts and growth capital transactions. The first three Quadrant funds delivered a collective 37% return between 1996 and 2006. 

The firm owns or co-owns a number of well-known Australian companies including Darrell Lea, Journey Beyond, Barbeques Galore, Timezone and is Australia's largest fitness centre operator through acquisitions of brands including Fitness First and Jetts Fitness.

Quadrant has floated a number of its interests on the Australian Stock Exchange (ASX) including Kathmandu, Virtus Health, Isentia, APN Outdoor, Bapcar (previously Burson Auto Parts) and Estia Health.

According to en.wikipedia