Quadrant’s predecessor firm was founded in 1978, with headquarters in New York.  For over 40 years, Quadrant has invested  in companies around the world. 

Quadrant has an opportunistic investment philosophy and invests primarily in control positions of private companies. Quadrant's portfolio includes investments in manufacturing, healthcare, logistics and infrastructure, education, insurance and financial services, neurotechnology, telecommunications, oil and gas services, business services, and alternative energy. Quadrant has a global portfolio, with active investments in the US, South America, East and Southeast Asia and Europe.