Gontran de Quillacq, legal consultant / expert witness

Gontran de Quillacq has over 20 years of Securities experience specializing in Portfolio Management, Equity Derivatives Trading, Proprietary Trading and Investment Research. He has worked with top-tier banks and hedge funds in both London and New York.

Background Experience - A proprietary and derivatives trader, Mr. de Quillacq traded derivatives, from vanillas to exotics. As a portfolio manager, he researched and managed investment strategies, delivered both in hedge fund and in structured note formats. He actually initiated the distribution of investment strategies with derivatives, an activity now called 'portable alpha' and 'smart beta'. For five years, Mr. de Quillacq then ran due diligence on investments strategies and selected senior investment personnel for some of the world’s most famous and most demanding hedge funds and asset managers - portfolio managers, analysts, quants, CIOs, CROS. In 2017, he co-founded a quantitative activity deploying the latest machine learning techniques in global long/short equities.

Litigation Support - Mr. de Quillacq's investment experience and cross-sectional review of other professionals give him unique experience on what can be done, what should be done, what should not be done, and the grey areas in-between. During a personal case against HSBC, his legal team was so impressed by his wide and thorough knowledge in finance, his capacity to explain complicated ideas in simple terms, and his strong performance on the stand, that they strongly recommended he expand his litigation support services. Mr. de Quillacq is now a FINRA/NFA arbitrator, a member of the Securities Expert Roundtable and an IMS Elite Expert. He has consulting affiliations with Barrington Financial Consulting Group and Ankura (Navigant).

Mr. de Quillacq's services are available to attorneys representing plaintiff and defendant and include written reports, deposition, arbitration, mediation, and trial testimony as needed.

Areas of expertise

  • Investments and trading: Securities and derivatives (stock options, swaps, exotics...), structured products, complex financial instruments, benchmark manipulations (Libor, FX, indices, VIX), liquidity management, statistical arbitrage and algorithmic trading, portfolio construction and risks, management fees, broker dealers, hedge funds
  • Due diligence and selection: Strategy review, selection and employment of front-office personnel: portfolio managers, traders, quants, analysts, broker-dealers, compensation, due diligence, U5.
  • Supported practice areas: Financial fraud & litigation, commodities & securities manipulation, white-collar crime, broker-dealers, hedge funds, investigations, enforcement, whistleblowing, alternative dispute resolution, FINRA.


  • Lycee Faidherbe, Classes Preparatoires, 1989
  • Ecole d'Application du Train, Military Academy, Lieutenant, 1991
  • Ecole Normale Superieure de Lyon, MS Theoretical Physics, alumnus ("ancien élève"), 1992
  • Ecole Superieure d'Electricite, DEA (doctoral degree), 1993
  • HEC, MS Management, alumnus ("diplomé d'HEC"), 1995


  • SFA: Trader, 1997, General Representative, 2001
  • DTB, Eurex, Xetra, EuroNext, Saxess, StocholmBorsen, HEX, SWX, Registered Trader, 1997-2002
  • FINRA Series 7, Series 55, Series 63, 2006 (lapsed)
  • FINRA non-public arbitrator, 2018
  • NFA Arbitrator, 2018

Resume, introduction video and cases