William Brennan

Chief Administrative Officer


In his role as Chief Administrative Officer, Bill oversees the day-to-day management of the business, responsible for the operations, finance, compliance and risk functions, ensuring the alignment with the company’s visions and policies.


Prior to joining Apex, Bill served as Managing Director and Global Co-Head of Clearing for Goldman Sachs where he was responsible for infrastructure and financial management as well as building out an international clearing platform. Prior to joining Goldman Sachs, Bill served as Chief Financial Officer at First Options of Chicago, Inc.

Bill graduated from the University of Illinois with a B.S. in Accounting. He became a C.P.A. in 1989 and received his J.D. from IIT-Chicago Kent College of Law in 1995.


In his free time, Bill indulges his love of classic television and finding new genres of music.

“Be kind to the people you meet on the way up, because you’re gonna meet the same people on the way down.”

  Wilson Mizner