MaryAnn J. Sung represents individuals and corporations in government investigations, regulatory enforcement and criminal proceedings, and corporate internal investigations.


Ms. Sung has extensive experience representing clients in complex regulatory investigations, including those brought by the Securities and Exchange Commission (SEC) and the Department of Justice (DOJ), concerning securities laws, insider trading, and tax and accounting laws. Prior to joining Skadden in 2016, Ms. Sung practiced at a litigation boutique and another international law firm in New York where she represented individuals and corporations in criminal and civil matters.

Ms. Sung’s representative matters include representation of:

  • public corporations in connection with SEC investigations of accounting restatements;
  • a senior executive of an investment adviser in SEC and DOJ antitrust investigations;
  • an individual in an SEC insider trading investigation;
  • senior executives of an investment adviser and broker dealer in an SEC investigation of trading practices and whistleblower retaliation;
  • a mutual fund senior executive in an SEC enforcement action relating to a bond fund’s investment in mortgage-backed securities;
  • an investment bank in Commodity Futures Trading Commission inquiry regarding cross-border foreign exchange options trading;
  • a private equity firm and its chief executive officer in an SEC investigation relating to management of investment funds; and
  • a hedge fund manager who was acquitted in the first federal criminal trial arising out of the financial crisis.



  • J.D., New York University Law School, 2002 (magna cum laude; Order of the Coif; Notes Editor, New York University Law Review)
  • B.A., Wesleyan University, 1993


  • New York
  • U.S. District Court for the Southern and Eastern Districts of New York


Member, Advisory Board, Immigrant Defense Project


Law Clerk to the Hon. Wilfred Feinberg, U.S. Court of Appeals for the Second Circuit (2002-2003)

MaryAnn J. Sung

Counsel, Government Enforcement and White Collar Crime