Zachary D. Caplan

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Zach Caplan concentrates his practice on antitrust litigation.

Since joining the firm, Mr. Caplan has worked on a variety of antitrust matters resulting in substantial settlements. E.g., Marchbanks Truck Service, Inc. v. Comdata Network, Inc., No. 07-cv-1078 (E.D. Pa.) ($130 million settlement plus significant prospective relief); In re Titanium Dioxide Antitrust Litigation, No. 10-cv-318 (D. Md.) (settlements totaling $163.5 million); In re High Tech Employee Antitrust Litigation, No. 11-cv-2509 (N.D. Cal.) (settlements totaling $435 million); Adriana Castro, M.D., P.A., et al. v. Sanofi Pasteur Inc., No. 11-cv-7178 (D.N.J.) ($61.5 million settlement); In re Celebrex Antitrust Litigation, No. 14-cv-361 (E.D. Va.) ($94 million settlement).

Mr. Caplan is currently involved in a number of antitrust and commodities class actions alleging manipulation of key financial benchmarks. E.g., In re Commodity Exchange, Inc., Gold Futures and Options Trading Litigation, No. 14-md-2548 (S.D.N.Y.); In re Libor-Based Financial Instruments Antitrust Litigation, No. 11-md-2262 (S.D.N.Y.). He also works on antitrust class actions on behalf of direct purchasers of prescription drugs. E.g., In re Generic Pharmaceuticals Pricing Antitrust Litigation, No. 16-md-2724 (E.D. Pa.); In re Loestrin 24 Fe Antitrust Litigation, No. 13-md-2472 (D.R.I.); In re Opana ER Antitrust Litigation, No. 14-cv-10151 (N.D. Ill.).

Mr. Caplan is a regular contributor to American Bar Association health care and antitrust publications.  He also has several other published articles including on,, and Law360.  While in law school, Mr. Caplan participated in the United States Department of Justice Antitrust Division’s Summer Law Intern Program (SLIP).

Professional Leadership

  • Member of the American Antitrust Institute’s Jerry S. Cohen Memorial Writing Award Committee

Judicial Praise:

From Judge Madeline Cox Arleo, of the U.S. District Court for the District of New Jersey:

I just want to thank you for an outstanding presentation. I don’t say that lightly . . . it’s not lost on me at all when lawyers come very, very prepared. And really, your clients should be very proud to have such fine lawyering. I don’t see lawyering like this every day in the federal courts, and I am very grateful. And I appreciate the time and the effort you put in, not only to the merits, but the respect you’ve shown for each other, the respect you’ve shown for the Court, the staff, and the time constraints. And as I tell my law clerks all the time, good lawyers don’t fight, good lawyers advocate. And I really appreciate that more than I can express.

Transcript of the September 9 to 11, 2015 Daubert Hearing in Ariana Castro, M.D., P.A., et al. v. Sanofi Pasteur Inc., No. 11-cv-07178 (D.N.J.) at 658:14-659:4.



Law School

University of Pennsylvania Law School, J.D.


New York University, B.S.

Honors & Awards:

  • Distinguished by The Legal Intelligencer as a “Lawyer on the Fast Track.”

  • Distinguished as a Super Lawyer “Rising Star,” 2016-2020.


Member – Pennsylvania and Illinois Bars

Admitted – Eastern District of Pennsylvania; Third and Seventh Circuits

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