Members

Donn Stobierski
Managing Member

Donn Stobierski has 23 years of experience in options trading and portfolio risk management.  His career began at Hull Trading on the floor of CBOE trading equity options.  He relocated to Europe where he successfully developed and grew their electronic options market making business.  In 2003, he moved to Citadel Securities where he helped advance the high frequency trading business into one of the world's leading market makers.  In 2010, Donn became Managing Director and Desk Head in charge of day to day trading and risk management of the high frequency options portfolio.  Most recently, he led the Chicago office for Volant Trading, building and developing the trading team and improving profitability.  He received a BSc in Chemical Engineering from Purdue University and a MSc in Financial Markets and Trading from IIT University.

Thong Wei Koh
Managing Member

Thong Wei Koh has 20 years of experience in quantitative volatility modeling and more than 15 years of experience in
options trading and portfolio risk management. His career began at UBS where he developed proprietary pricing models for the Exotics derivatives businesses and the quantitative research and development for the automated options market making group in UBS.  In 2006-2007, he became Managing Director and the Global Co-Head of Electronic Volatility Trading group at UBS.  From late 2007, Thong Wei moved from market making to developing quantitative models and trading strategies for proprietary trading at trading firms.  In the period 2015 to 2018, he was a partner at Volant Trading where he built a proprietary research and trading group.  Thong Wei earned a DPhil from Oxford University, UK.