Petra Funds Group, a U.S.-based fund administrator serving private investment firms, has entered into a definitive agreement to receive a majority growth investment from Charlesbank Capital Partners, a middle-market private investment firm based in the U.S. The Petra founders and management team remain significant shareholders alongside Charlesbank. Founded in 2021, Petra offers fund administration and related middle and back-office services to private equity and private debt managers with >USD110bn AuA.