IQ-EQ, the Luxembourg-based investor services provider, has acquired Greyline Partners, LLC, a U.S. provider of governance and regulatory compliance solutions for private capital, hedge funds and investors. Founded in 2016, Greyline has 56 people across its six offices located in San Francisco, Dallas, New York, Chicago, Boston and London. Also part of Greyline is GCM Advisory, an outsourced CFO, finance and accounting business launched in 2021.