Gregory M. Sergi
Senior Counsel
T: 949.476.8700
F: 949.476.0900
gsergi@kelleranderle.com
PRACTICE AREAS
Trials
Commercial Litigation
Intellectual Property
Antitrust
Legal Malpractice
Trusts & Estates Litigation
EDUCATION
Duke University School of Law, J.D. and LLM in International and Comparative Law, magna cum laude, Order of the Coif
SDA Bocconi School of Management, Milan, Italy, Masters in International Economics and Management
Northwestern University, B.A., Economics
CLERKSHIPS
Law Clerk, The Honorable Pamela A. Rymer, U.S. Court of Appeals for the Ninth Circuit
Law Clerk, The Honorable D. Brock Hornby, U.S. District Court for the District of Maine
EXTERNSHIP
Extern, General Counsel for the United States Trade Representative

Gregory M. Sergi is an experienced litigator whose practice focuses on complex civil litigation in federal and state courts. Greg has helped clients navigate litigation matters involving antitrust, class action, constitutional, consumer protection, contract, false advertising, legal malpractice, trademark and trade dress, trusts-and-estates, and unfair competition issues. Greg’s clients have included companies in the aviation, entertainment, financial services, legal, medical device, online retail, pharmaceutical, and shipping industries.
In 2024, Greg was an integral member of the trial team that won one of the largest Lanham Act false advertising verdicts in history, in Guardant Health Inc. v. Natera Inc. The jury trial verdict was a complete sweep for Guardant Health: $75 million for corrective advertising, $42 million for disgorgement of profits and $175.5 million in punitive damages. The trial was held in the United States District Court for the Northern District of California.
In 2023, Greg represented MGA Entertainment against trademark and intellectual property claims brought by Rapper, TI Harris. TI Harris and the other plaintiffs were seeking over $100 million in damages. Greg single-handedly destroyed their damages’ expert helping to secure a complete jury verdict in favor of MGA in less than two hours. The Los Angeles and San Francisco Daily Journals recognized this win as a Top Defense Verdict in 2023.
MoreLos Angeles Magazine, Southern California Super Lawyers®, Antitrust Litigation, Appellate, Intellectual Property Litigation, Business Litigation, Class Action/Mass Torts: Defense (2022-2025)
The Los Angeles and San Francisco Daily Journals, “Top Verdicts” (2024)
Los Angeles Magazine, Southern California Super Lawyers, Rising Star in Antitrust Litigation (2014-2018)
Order of the Coif
Integral member of the trial team that won one of the largest Lanham Act false advertising verdicts in history, in Guardant Health Inc. v. Natera Inc. The jury trial verdict was a complete sweep for Guardant Health: $75 million for corrective advertising, $42 million for disgorgement of profits and $175.5 million in punitive damages. The Los Angeles and San Francisco Daily Journals recognized this win as a Top Verdict in 2024.
Representing a cutting-edge medical device manufacturer in claims of false advertising against a competitor.
Representing a national law firm in trusts-and-estates litigation involving the administration of a multi-billion dollar estate.
Representing BNSF as part of a national team against antitrust conspiracy allegations involving fuel surcharges.
Represented MGA Entertainment against trademark and intellectual property claims seeking over $100 million in damages under the Lanham Act. The jury returned a complete verdict in favor of MGA in less than two hours. The Los Angeles and San Francisco Daily Journals recognized this win as a Top Defense Verdict in 2023.
Represented CashCall, Inc. (an Orange County-based consumer financial company) in a landmark legal malpractice case seeking nearly $1 billion in damages against a major international law firm. The case settled on the eve of trial.
Represented a prominent online retailer in federal district court and the court of appeals in successfully defeating a challenge by three large medical device companies to the constitutionality of a state’s pricing and distribution regulations under the dormant Commerce Clause.
Represented a pharmaceutical company in defending against antitrust, unfair competition, consumer protection, and unjust enrichment claims, including successfully opposing motions for class certification by two different proposed classes.
Represented an aviation company in obtaining dismissal of antitrust and tort claims challenging exclusivity provisions with an aircraft manufacturer.
Represented a private equity firm in obtaining a preliminary injunction in federal district court to enforce “change in control” provisions of a joint venture agreement.
Represented a large financial institution in successfully obtaining the dismissal of securities claims relating to the acquisition of a major provider of residential mortgages.
Represented an online retailer in administrative proceedings, including trial, brought by the Federal Trade Commission relating to trademark litigation settlement agreements that allegedly restrained keyword advertising on Internet search engines.
Represented a large pharmaceutical company in a nationwide MDL in the defense of antitrust, unfair competition, consumer protection, and unjust enrichment claims challenging an alleged “reverse-payment” settlement of prior patent litigation.

Gregory M. Sergi
Senior Counsel
T: 949.476.8700
F: 949.476.0900
gsergi@kelleranderle.com
EDUCATION
Duke University School of Law, J.D. and LLM in International and Comparative Law, magna cum laude, Order of the Coif
SDA Bocconi School of Management, Milan, Italy, Masters in International Economics and Management
Northwestern University, B.A., Economics
CLERKSHIPS
Law Clerk, The Honorable Pamela A. Rymer, U.S. Court of Appeals for the Ninth Circuit
Law Clerk, The Honorable D. Brock Hornby, U.S. District Court for the District of Maine
EXTERNSHIP
Extern, General Counsel for the United States Trade Representative
EXPERIENCE
Gregory M. Sergi is an experienced litigator whose practice focuses on complex civil litigation in federal and state courts. Greg has helped clients navigate litigation matters involving antitrust, class action, constitutional, consumer protection, contract, false advertising, legal malpractice, trademark and trade dress, trusts-and-estates, and unfair competition issues. Greg’s clients have included companies in the aviation, entertainment, financial services, legal, medical device, online retail, pharmaceutical, and shipping industries.
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