The vehicle has received a $50m commitment from Apax Global Alpha and will provide growth capital on a global basis.
The Nordic lower mid-market firm has invested in Swedish company IVBAR Institute, Norway's Documaster and UK-based Qlearsite.
The vehicle will back global private equity funds that demonstrate a positive environmental or social impact.
Arnold Suhr is the world’s second largest trader in quinine.
Park Square currently manages approximately $7bn of capital. The debt provider was founded in 2004 and has offices in London and New York.
An added £1m under EIS will be invested in the summer to complete the £2.3m funding.