Meet the Partners
Aaron S. Hantman
CHIEF EXECUTIVE OFFICER
Aaron is a founding partner and CEO of Tourmaline Partners. In addition to his management responsibilities, he was responsible for the supervision, build-out and expansion of the listed derivatives business.
Prior to co-founding Tourmaline Partners, Aaron built a distinguished twelve-year career at Susquehanna International Group (SIG), as the CEO and President of Susquehanna Financial Group, while also holding the position of Global Head of Institutional Sales. During his earlier years at SIG, he served as Head Trader and manager of SIG’s NYSE operations, and began his career in equity derivatives and OTC trading.
Aaron earned his B.S. in Biology from Yale University.
HENRY G. Higdon III
CO-HEAD OF GLOBAL EQUITY TRADING
Henry is a founding partner and co-head of global equity trading at Tourmaline Partners. In addition to providing US trading coverage for domestic and international domiciled clients, he also focuses on the development and supervision of all equity trading activity at the firm. He has over 15 years of experience in the outsourced trading space, including 5 years spent in the firm's London office overseeing the build-out and expansion of its UK presence and trading team.
Henry began his career at Merrill Lynch in New York, as an Analyst on both the Equity Capital Markets and US Cash Equity Trading desks. He went on to work as a Principal at Williams Trading, and a Managing Director at Greenwich Prime Trading Group.
Henry graduated from Harvard College with a B.A. in Economics.
Daniel M. “Ike” Groff
CO-HEAD OF GLOBAL EQUITY TRADING
Ike is a founding partner and co-head of global equity trading at Tourmaline Partners. With more than 20 years of trading experience, he focuses on the development and supervision of all equity trading activity at the firm, and as the primary point of contact for clients trading domestic equities.
Prior to the formation of Tourmaline, Ike held similar roles at Greenwich Prime Trading Group. In his earlier years, he was a Principal and Senior Equity Trader at Williams Trading, and a Senior International Equity Trader at Merrill Lynch, where he began his career.
Ike earned his M.B.A. from the Stern School of Business at New York University, and his B.S. in Finance from Western Michigan University.
Jonathan H. Goldstein
CHIEF FINANCIAL OFFICER
Jon is a founding partner and CFO of Tourmaline Partners, with over 20 years of financial industry experience.
As a Certified Public Accountant, he transitioned to the buy side as Controller of Morgens, Waterfall, Vintiadis & Co., subsequently became CFO at Red Coat Capital Management, and later helped found Stadia Capital.
Just prior to founding Tourmaline Partners, Jon spent two years at Greenwich Prime Trading Group, after spending 8 years at Williams Trading as Chief Financial Officer, Chief Operating Officer, and Financial and Operations Principal.
Jon earned his B.S. in Accounting and Business Administration from the State University of New York at Albany.
CHIEF OPERATIONS OFFICER
With over 20 years of experience in trading and operations, Dan built Tourmaline's operations architecture, and currently supervises all settlement processes across the firm's domestic and international desks.
Prior to forming Tourmaline Partners, Dan was Head of Operations at Greenwich Prime Trading Group, after spending 11 years as a Principal of Williams Trading, in a similar supervisory position.
Dan began his career as an Operations Clerk at Morgan Stanley, soon after graduating from Villanova University with a B.S. in Finance and Business Administration.