Dianne M. Nast

Attorney Profile

Top Rated Antitrust Litigation Attorney in Philadelphia, PA

NastLaw LLC
 | 1101 Market Street, Suite 2801
Philadelphia, PA 19107
Phone: 215-923-3000
Selected To Super Lawyers: 2004 - 2021
Licensed Since: 1976
Practice Areas:
  • Antitrust Litigation (80%),
  • Class Action/Mass Torts: Plaintiff (10%),
  • Personal Injury - Products: Plaintiff (10%)
  • Free Consultation
Attorney Profile

The founder of NastLaw LLC, Dianne M. Nast has more than 40 years of experience in complex civil litigation. From her office in Philadelphia, Pennsylvania, she provides representation to plaintiffs in antitrust cases involving pharmaceutical manufacturers, defective drug and medical device litigation, and insurance coverage lawsuits. Ms. Nast has served as lead or co-lead counsel in many class actions.

As an undergraduate, Ms. Nast attended The Pennsylvania State University and received a bachelor's degree magna cum laude. She pursued her legal studies at Rutgers Law School and was awarded her Juris Doctor.  Admitted to practice in Pennsylvania and New Jersey, Ms. Nast is also admitted to practice before the U.S. Courts of Appeals for the 3rd, 5th, 6th, 7th, 8th and 11th Circuits and the Supreme Court of the United States, many Federal District Courts and the Courts of Pennsylvania and New Jersey.

Ms. Nast has been appointed as lead counsel in multiple major lawsuits and has helped to obtain multimillion dollar awards or settlements in most of them. By way of example, in a multidistrict litigation case involving diet drugs, she assisted in obtaining a settlement in excess of $6 billion. In another case involving a pharmaceutical remedy for hemophilia, the defendants settled for approximately $600 million. She was one of settlement counsel in the NFL Concussion Litigation which settled for in excess of $1 billion.  Ms. Nast has been selected for inclusion in The Best Lawyers in America each year since 2003, and has received an AV Preeminent* peer review rating through Martindale-Hubbell.  She has received multiple Lifetime Achievement awards and has been invited to membership in numerous honorary organizations and associations.

An active participant in several legal organizations, including the American Association for Justice and the American Bar Association, Ms. Nast has also served on the board of directors of the Center for Research on Women and Newborn Health. She is frequently asked to give presentations on topics related to her practice area at continuing legal education seminars.

Ms. Nast, as noted above, has been appointed as Lead Counsel or as a member of the Executive Committees in scores of  Antitrust, Products Liability and Consumer cases. Most recently she has been appointed by The Honorable Cynthia Rufe to be Liaison and Co-Lead Counsel for Direct Purchaser Plaintiffs in the Generic Pharmaceuticals Pricing Litigation, MDL 2724 (E.D. Pa.), currently one of the largest antitrust MDLs in the United States.

Other cases where Ms. Nast has been appointed as Lead Counsel or Co-Lead Counsel include the following representative cases: Wellbutrin SR Antitrust Litigation, (SAJ Distributors, Inc., et al v. SmithKline Beecham Corp., Civil Action No. 04-5525 (E.D. Pa.)); Steel Drums Antitrust Litigation, MDL No. 887 (S.D. Ohio); Steel Pails Antitrust Litigation, Master File No. C-1-92-213 (S.D. Ohio);Waste Haulers Antitrust Litigation, Master File No. 87-3717 (E.D. Pa.); Comcast Corp. Set-Top Cable Television Box Antitrust Litigation, MDL No. 2034 (E.D. Pa.); Yaz/Yasmin/Ocella/Gianvi Products Liability Litigation, No. 1307 (Phila. C.C.P. No. 1307); Zoloft (Sertraline Hydrochloride) Products Liability MDL Litigation, Beechnut Consumer Litigation, Master File No. 86-6608 (E.D. Pa.); Augmentin Antitrust Litigation C.A. No. 04-CV-23 (E.D. Va.); Chrysler Motors Corporation Overnight Evaluation Program Litigation, MDL 740 (E.D. Mo.); Chrysler II Litigation, Master File No. 92-424-JPG (S.D. Ill.); Hertz Car Rental Litigation, Civil Action No. 88-0661 (E.D. Pa.); SmithKline Beecham Securities Litigation, (Phil. C.C.P. No. 2562); Nifedipine Antitrust Litigation, MDL No. 1515 (D.D.C.); and Paxil Antitrust Litigation (Nichols et al. v. SmithKline Beecham Corp.), Civil Action No. 00-6222 (E.D. Pa.).

Practice Areas
  • 80%Antitrust Litigation
  • 10%Class Action/Mass Torts: Plaintiff
  • 10%Personal Injury - Products: Plaintiff
Focus Areas

Antitrust & Trade Litigation, Class Actions, Medical Devices, Products Liability


Selected to Super Lawyers for 18 yearsbottom-image

Super Lawyers: 2004 - 2021

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About Dianne Nast

Admitted: 1976, Pennsylvania

Professional Webpage: https://nastlaw.com/about-nastlaw/lawyers/dianne-m-nast/


  • AV rating, Martindale-Hubbell
  • Selected in 2017 and 2018, Lifetime Achievement Award, Philadelphia Bar Association
  • Named by Philadelphia Magazine as One of Pennsylvania’s Top Fifty Women Attorneys
  • The National Law Journal, Selected as One of the Nation’s Top Fifty Women Litigators
  • Selected as Super Lawyer
  • Selected annually since 2003, Best Lawyers in America
  • Selected to Chambers USA

Bar/Professional Activity:

  • American Bar Association, Philadelphia Bar Association, American Association of Justice

Pro bono/Community Service:

  • Lancaster Catholic High School Board of Governors, member St Leo the Great Board of Education, Chair
  • Past President, Center for Research for Women and Newborn Health (“CROWN”), Chair, St. Leo the Great School Board; member, Lancaster Catholic High Board of Supervisors


  • Factor Concentrate Litigation, (N.D. Ill.), MDL No. 986
  • In re NFL Players'  Concussion Injury Litigation (E D Pa)   In re Dairy Farmers Antitrust Litigation (S D Ill)
  • Wellbutrin SR Antitrust Litigation $69 million settlement 
  • Diet Drugs Litigation, (E.D.P.A.), MDL. No. 1203
  • Serzone Products Liability Litigation, (S.D.W.V.), MDL No. 1477

Other Outstanding Achievements:

  • Selected for many years as a member of various Who's Who publications such as Who's Who, Who's Who in American Women.
  • Selected for membership in numerous Honorary Associations such a the National Association of Distinguished Counsel

Educational Background:

  • Rutgers University School of Law; Pennsylvania State University
Find Me Online
Website - www.nastlaw.com
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Office Location for Dianne M. Nast

1101 Market Street
Suite 2801
Philadelphia, PA 19107

Phone: 215-923-3000

Dianne M. Nast:

Last Updated: 3/10/2021

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