Interlock Equity, a private equity firm, completed the investment in Investor Group Services, a Boston-based consulting firm serving the private equity industry. Financial terms were not disclosed. "The team at Interlock has deep expertise and a fantastic track record of successfully scaling top-notch professional services firms. They are the perfect partner for IGS as we prepare for our next chapter of growth," Mindy Berman, Investor Group Services Co-Founder and Senior Managing Director.