Caitlin G. Coslett is a Shareholder and Co-Chair of the Firm’s Antitrust Department. She also serves on the Firm’s Diversity, Equity, and Inclusion Task Force and as the Work Assignment Coordinator. Ms. Coslett concentrates her practice on complex litigation, including antitrust and mass tort litigation.

Ms. Coslett represents classes of direct purchasers of pharmaceutical drugs who allege that drug manufacturers have violated federal antitrust law by wrongfully keeping less-expensive generic drugs off the market and/or by wrongfully impeding generic competition. Her work on generic suppression cases has contributed to significant settlements totaling hundreds of millions of dollars, including in the cases of In re Solodyn (Minocycline Hydrochloride) Antitrust Litigation (for which Ms. Coslett served as Co-Lead Counsel), In re Lidoderm Antitrust Litigation, and In re Skelaxin (Metaxalone) Antitrust Litigation. Ms. Coslett is currently litigating several similar antitrust pharmaceutical cases, such as In re Effexor XR Antitrust LitigationIn re Bystolic Antitrust LitigationIn re Intuniv Antitrust LitigationIn re Lamictal Antitrust LitigationIn re Novartis and Par Antitrust LitigationIn re Opana ER Antitrust Litigation, and In re Suboxone (Buprenorphine Hydrochloride and Naloxone) Antitrust Litigation. She was honored for “Outstanding Antitrust Litigation Achievement by a Young Lawyer” for her work in In re Lidoderm Antitrust Litigation.

Ms. Coslett’s experience litigating antitrust class actions also includes In re CRT Antitrust LitigationIn re Domestic Drywall Antitrust Litigation, In re Payment Card Interchange Fee and Merchant Discount Antitrust LitigationIn re Steel Antitrust Litigation, and In re Urethane [Polyether Polyols] Antitrust Litigation.

Ms. Coslett also played a significant role in the post-trial litigation in Cook v. Rockwell International Corporation, a mass tort class action brought on behalf of thousands of property owners near the Rocky Flats nuclear plant in Colorado. The case settled for $375 million following a successful appeal to the Tenth Circuit and, in ruling for the plaintiffs on appeal, then-Judge Neil Gorsuch (who is now a Supreme Court Justice) praised Class Counsel’s successful “judicial jiu-jitsu” in litigating the case through the second appeal.

Ms. Coslett was named a “Next Generation Lawyer” by The Legal 500 United States 2019 in the Civil Litigation/Class Actions: Plaintiff category and was selected as a Rising Star by Super Lawyers every year from 2014 – 2021. She has served as pro bono counsel for clients referred by the AIDS Law Project of Pennsylvania and Philly VIP and is a member of the National LGBT Bar Association.

A Philadelphia native, Ms. Coslett graduated magna cum laude from Haverford College with a B.S. in mathematics and economics and graduated cum laude from New York University School of Law. At NYU Law, Ms. Coslett was a Lederman/Milbank Fellow in Law and Economics and an articles selection editor for the NYU Review of Law and Social Change. Prior to law school, she was an economics research assistant at the Federal Reserve Board in Washington, D.C. Ms. Coslett was formerly one of the top 75 rated female chess players in the U.S.

Professional Leadership

  • Co-Chair of the Antitrust Committee of the Philadelphia Bar Association
  • Panelist for “What’s New in Antitrust Doctrine, Procedure, and Research?,” Bar Association of San Francisco, April 2022.
  • Panelist at “15th Annual Private Enforcement Conference,” American Antitrust Institute, November 2021.
  • Panelist for “Civil Justice Fest: A Month of Dialogues on the Most Pressing Civil Justice Issues,” Law & Economic Center, George Mason University Law School, November 2020.
  • Panelist at “13th Annual Private Enforcement Conference,” American Antitrust Institute, November 2019.

Business and Community Leadership

  • Ms. Coslett serves on the Board of Directors of Community Legal Services and on the Board of Directors of AccessMatters. She previously served on the Board of Directors of New Directions for Women (2013-2019), which was dedicated to empowering female ex-offenders to become independent and participating community members.
  • Ms. Coslett is a longtime volunteer tournament director with After School Activities Partnerships, organizing chess tournaments for Philadelphia public school students and clubs, including an annual tournament at her alma mater, Haverford College
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Honors & Awards


  • Member – Pennsylvania Bar
  • Member – New Jersey Bar
  • Admitted – Eastern District of Pennsylvania
  • Admitted – District of New Jersey
  • Admitted – Tenth Circuit Court of Appeals