Tiffany Rider
{ Bio Portrait }

Tiffany Rider has over 20 years of experience focusing on criminal antitrust cartel investigations; follow-on antitrust class action litigation; and complex mergers and acquisitions.

Regarded as a prominent antitrust advisor, Tiffany has been ranked by Chambers USA as an "Antitrust: Litigation Specialist" and recognized in Legal 500 United States. Tiffany has represented companies and individuals in consequential domestic and international cartel cases, advocating before the Department of Justice and European Commission, among a number of other global enforcement agencies. She also has extensive experience in civil follow-on MDLs, civil litigation and arbitration.

In her counseling and compliance practice, Tiffany designs and implements global competition compliance programs tailored to meet the diverse needs of clients in a wide array of industries, including technology, manufacturing, transportation, food and beverage, health care and financial services. Additionally, Tiffany has extensive experience representing clients on significant mergers and acquisitions, including before both the Department of Justice and Federal Trade Commission.

Tiffany is a frequent speaker on panels on criminal antitrust and civil litigation issues. She has held several key ABA leadership roles, including on the International Cartel Task Force, Civil Practice and Procedure Committee, and the Diversity Plan Task Force. She served by invitation from the U.S. DOJ as a non-governmental advisor (NGA) for the International Competition Network (ICN) at the 2021 Annual Conference.

Prior to joining Axinn, Tiffany practiced in the antitrust department of a large, global law firm.

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Professional Activities

  • American Bar Association, International Cartel Task Force
  • American Bar Association, Section of Antitrust Law: Former Co-Chair, Civil Practice & Procedure Committee
  • American Bar Association, "Perspectives in Antitrust" Newsletter, Founder & Former Editor
  • American Bar Association, Women.Connected Advisory Board, Founder
  • American Bar Association, Diversity Plan Task Force
  • American Bar Association, Section of Antitrust Law, Membership Vice Chair
  • American Bar Association, Antitrust Law Student Ambassador Program, Leadership


  • Currently, lead counsel defending Tyson Foods in multiple major treble-damage class action litigations and regulatory investigations alleging industry-wide conspiracies to raise the prices of pork and turkey.
  • Represented a company and obtained leniency in a DOJ no-poach investigation.
  • Represented several individuals successfully in a DOJ no-poach investigation.
  • Represented Corning Incorporated in the auto part criminal investigation and follow-on civil MDL.
  • Successfully closed a no-poach investigation.
  • Successfully closed a bid-rigging investigation of a defense contracting firm.
  • Successfully closed a price-fixing investigation of an international shipping company.
  • Represented Horizon Lines in the cabotage shipping criminal investigation and follow-on civil MDL, as well as its transactions valued at $610 million with Pasha and Matson.
  • Represented EQT Corporation in its $720 million sales of its natural gas distribution business to Peoples Natural Gas.
  • Represented Sprint in its opposition to AT&T’s proposed acquisition of T-Mobile. This case was recognized in the 2012 Financial Times “U.S. Innovative Lawyers” report.
  • Represented BHP Billiton in its proposed $150 billion acquisition of Rio Tinto (received Department of Justice clearance). 

* Includes matters handled prior to joining Axinn


  • Chambers USA – District of Columbia: Antitrust: Litigation Specialists (2018 – 2024)
  • Named to Business Today's Top 10 DC Antitrust Litigation Specialists to Watch in 2023
  • Lawdragon, 500 Leading Litigators in America (2023-2024)
  • Named to "Women Worth Watching 2019" by Profiles in Diversity Journal
  • The Legal 500 United States (2022-2024)

Thought Leadership



  • JD, magna cum laude – Indiana University School of Law (2002)
  • BA, Theatre Arts – University of California, Los Angeles (1992)


  • District of Columbia
  • Indiana
  • U.S. District Court Northern District of Indiana
  • U.S. District Court Southern District of Indiana
  • U.S. District Court District of Columbia
  • U.S. District Court Eastern District of Michigan

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