Aaron S. Hantman

Tourmaline Partners LLC (Tourmaline) is a trading solutions firm headquartered in Stamford, Connecticut. The firm was founded in 2011 by Daniel DiSpigna, Jon Goldstein, Henry Higdon, Daniel Groff and Aaron Hantman. Tourmaline provides outsourced, supplemental and customized trading services to asset managers of all sizes. They deliver buy-side execution offers in global equites, derivatives and ETFs on behalf of hedge funds, mutual funds, RIAs, family offices, sovereign wealth funds and asset owners.

Susquehanna International Group LLP engages in the provision of investment and other financial services. It offers institutional brokerage, trading, research, and market making services for equities. The company was founded by Lon Taylor and Gordon Apple in 1987 and is headquartered in Bala Cynwyd, PA.