Catherine Koh Stillman

Catherine Koh Stillman

Baker & McKenzie LLP


Catherine Koh Stillman is a partner in the Firm’s Antitrust & Competition Practice Group. She is global co-lead of the Firm’s Competition Litigation Task Force.

Catherine is the leader of the New York office’s BakerWomen Initiative and is a member of the BakerWomen Steering Committee. She serves on the New York office’s Associate Recruiting Committee. Catherine has mentored numerous associates throughout her career at Baker McKenzie, and has maintained an active pro bono practice, focusing primarily on advocacy issues related to children and public international law.

Practice Focus

Catherine has extensive experience representing companies in government investigations and private litigations. Her work has encompassed all areas of antitrust including cutting-edge federal antitrust class actions, criminal and civil investigations, merger clearance, vertical distribution issues, competitor collaborations, monopolization, and counseling clients on how to manage antitrust risk in daily business activities.

Catherine’s antitrust practice spans a wide variety of industries, including, in particular, technology, healthcare, fashion and luxury goods, rail, automotive, and financial services.

She is admitted to practice in New York and California.

Representative Legal Matters

  • Representing a US environmental data provider against antitrust counterclaims alleging monopolization, standard manipulation, exclusive dealing, product bundling, and sham litigation.

  • Defended a German rail equipment manufacturer in In Re Railway Industry No-Poach Antitrust Litigation in the Western District of Pennsylvania, and defended client in related investigation and litigation by US DOJ’s Antitrust Division.

  • Defended a Japanese capacitors manufacturer in In re Capacitors Antitrust Litigation in the Northern District of California, which alleged price-fixing in the capacitors market, and took the lead on a significant dispositive motion that triggered favorable settlements.

  • Defended Chinese manufacturers of vitamin C in first price-fixing class actions brought in US courts against Chinese defendants involving landmark foreign sovereign compulsion issues (In re Vitamin C Antitrust Litigation), and was a key member of the trial team.

  • Defended a US manufacturer of filtration products in over 50 class actions, consolidated in the Northern District of Illinois, alleging price fixing in the aftermarket filters market.

  • Defended a global healthcare products company in an antitrust class action against claims relating to alleged monopolization, restraint of trade, civil conspiracy and restrictive contract clauses in the urological catheter market.

  • Defended a global healthcare products company in a lawsuit regarding alleged market manipulation of pulse oximetry products, including the use of sole-source contracts, market share discounts, co-marketing agreements and bundled rebates.

  • Defended a German medical device manufacturer in a federal antitrust lawsuit in the Eastern District of Texas challenging aftermarket service support, software and replacement parts distribution policies.

  • Represented global technology companies in various multibillion-dollar transactions.

  • Obtained FTC clearance for an American manufacturing company on its USD 602.5 million acquisition of a manufacturer of specialty glass and commercial display equipment.

  • Assisted in obtaining FTC clearance for the largest provider of dialysis services in relation to its USD 2 billion acquisition of another healthcare company.

  • Represented a supplier of medical waste collection and treatment services in investigations conducted by the Antitrust Division of the Department of Justice and selected state attorney general offices concerning multiple acquisitions.

  • Represented a global financial services company in a class action brought by merchant-plaintiffs alleging antitrust violations related to merchant discount and interchange fees.

  • Served as antitrust counsel on secondment at a multinational bank.

Professional Associations and Memberships

  • American Bar Association, Antitrust Section - Member
  • New York State Bar Association, Antitrust Section - Vice Chair, Cartel and Criminal Practice Subcommittee
  • New York City Bar Association, Antitrust Section - Member

Corporate Responsibility

  • Drafted the fundamental rights section of a draft Constitution presented to the legislature of Nepal, and co-authored a report on truth and reconciliation commissions presented to the legislature of Nepal.

  • Managed several teams on drafting an online database documenting laws affecting homeless youth in Nicaragua and Georgia as part of the global Legal Atlas for Street Youth.

  • Drafted amicus curiae brief on behalf of medical bioethicists regarding the medical ethics of a Florida mandatory delay law.

  • Helped represent a group of detainees challenging detention at Camp Delta, Guantánamo Bay, Cuba in a habeas corpus action.

  • Together with the Center for Constitutional Rights, organized a national conference and provided legal training for attorneys representing other detainees.


  • U.S. District Court, Southern District of New York~United States (2004)
  • U.S. District Court, Eastern District of New York~United States (2004)
  • California~United States (2007)
  • New York~United States (2003)


  • University of Michigan (2002)
  • Yale University (1999)


  • English
  • French
  • Spanish
  • Speaker on M&A Due Diligence, “Must-Haves for Pre-Transactional and Third-Party Due Diligence,” Association of Corporate Counsel of New Jersey, 23 May 2018.
  • Speaker on no-poach antitrust enforcement, “ABA Cartel Update: Recent Trends in Cartel Enforcement,” 27 February 2017
  • Moderator of “U.S. v. U.K. Cartel and Class Action Panel,” New York State Bar Association, 6 October 2016
  • Contributor, Antitrust Law Developments, Section of Antitrust Law of the American Bar Association, 2009-2014
  • Contributor, Chapter on State Immunity: Selected Materials and Commentary, Oxford University Press, 2003