Jonathan M. Grossman

Co-Chair, Antitrust

Jonathan advises clients on antitrust, consumer protection, and other government regulatory matters, including civil and criminal government investigations, mergers and acquisitions, counseling on antitrust, consumer protection and advertising issues, litigation, and legislative issues. He works with clients from a variety of industries, and has extensive experience in the health care, aviation, maritime, energy, high-tech, and financial services sectors.

Jonathan's merger practice includes involves advising on all aspects of a transaction, including advising on antitrust-related provisions in transaction agreements, conducting competitive analyses, preparing Hart-Scott-Rodino filings, representing clients in investigations by the Federal Trade Commission, the Antitrust Division of the U.S. Department of Justice, and state attorneys general, and counseling on pre-closing issues such as integration planning and gun-jumping.

Jonathan represents subjects, complainants, and third parties in government investigations by, among others, the U.S. Department of Justice, the Federal Trade Commission, the Consumer Financial Protection Bureau, the Federal Communications Commission, and state attorneys general. He also represents clients in proceedings before the National Advertising Division of the Advertising Self-Regulatory Council.

Jonathan's counseling work focuses on antitrust and consumer protection issues and includes providing advice to businesses, nonprofits, and trade associations on a wide variety of issues including, advertising claims, unfair or deceptive acts or practices, joint ventures and teaming arrangements, pricing and distribution issues, and exclusivity provisions. He also counsels clients on compliance issues related to a number of federal and state laws, including the Fair Debt Collection Practices Act, the Dodd-Frank Act, the Robinson-Patman Act, and the Consumer Product Safety Improvement Act.



Cozen O’Connor Serves as U.S. Counsel to Cogne Acciai Speciali SpA on Definitive Agreement to Acquire Capital Stock of Mannesmann Stainless Tubes GmbH

March 05, 2024

Mannesmann has operations and operating plants throughout the United States as well as in Germany, France, and Italy. The transaction is valued at €135 million.

Public Storage $11B Bid Would Likely Clear Antitrust Hurdles

February 08, 2023

Jonathan Grossman was quoted in an article published by Law360, which discusses Public Storage’s decision to broadcast its $11 billion takeover bid for Life Storage after not receiving a response from their board.

DOJ Focuses on Interlocking Directorates Reflects 'Shot Across the Bow' At PE – Analysis

December 21, 2022

Jonathan Grossman was quoted in an article published by Aldrin Brown, writer at Policy and Regulatory Report, that discusses the crackdown on interlocking directorates by the US Department of Justice’s Antitrust Division, forcing public companies to scrutinize their compliance with Section 8 of the Clayton Act.

Limited Resources Will Test DOJ Preference For Merger Suits

January 27, 2022

Jonathan Grossman was quoted in an article published by Law360, which discusses reactions to Jonathan Kanter, the U.S. Department of Justice's Antitrust Division chief, stating that merger settlements should be "the exception, not the rule."

Why Microsoft's $68.7B Activision Play Will Probably Succeed

January 20, 2022

Jonathan Grossman was quoted in an article published by Law360 which discusses how Microsoft's $68.7 billion deal to buy Activision Blizzard is sure to receive heavy scrutiny from U.S. antitrust and competition regulators.

Cozen O’Connor Serves as U.S. Counsel to the Owners of HEYDUDE® in Definitive Agreement on Its Sale to Crocs, Inc.

December 24, 2021

Cozen O’Connor acted as lead U.S. counsel to the owners of HEYDUDE®, a privately-owned casual footwear brand, in their definitive agreement to sell the companies comprising the HEYDUDE business to Crocs, Inc. (NASDAQ: CROX) for $2.5 billion. The consideration for the $2.5 billion acquisition will be $2.05 billion in cash and $450 million in Crocs shares.

4 healthcare antitrust issues to watch

March 01, 2021

Jonathan Grossman was featured in an article published by Healthcare Dive discussing four health care antitrust issues to watch.

FTC Orders Hospital, Health System, and Five Insurers in Two States to Share Vast Amounts of Data on Their Customers and on Past Acquisitions and Mergers

June 26, 2020

Jonathan Grossman was quoted in Dark Daily discussing how the Federal Trade Commission (FTC) is ready to look into hospital consolidation, as evidenced by the extent of data.

Punching In: The Latest COVID-19 Benefits, Liability Questions

April 20, 2020

Jonathan Grossman was featured in a Bloomberg Law article discussing how the feds are on the lookout for staffing agencies, recruiters, and businesses colluding to fix pay rates, limit hours or prevent workers from changing jobs, in violation of antitrust law.

Health Systems Unlikely to Prevail if they Challenge FTC's COPA Demands

October 24, 2019

Jonathan Grossman was quoted in Modern Healthcare discussing the Federal Trade Commission's demand for information on mergers.

Sutter Health settles class action antitrust lawsuit

October 16, 2019

Jonathan Grossman was featured in Modern Healthcare discussing his thoughts on the Sutter Health settlement.

Cozen O’Connor Names Jonathan Grossman, Robert Magovern, and Meridith Moldenhauer Washington, D.C. Office Leaders

August 27, 2019

Jonathan was promoted to office managing partner while Meridith and Robert will be co-vice chair, office managing partners.

Cozen O’Connor Promotes Eight New Shareholders

August 20, 2018

Cozen O’Connor is pleased to announce the promotion of eight members to shareholders: Marc Auberbach, Jonathan Grossman, Aaron Krauss, Daniel J. Luccaro, Barbara Muller, Joseph F. Rich, Nicole Sprinzen, and Paula Zecchini.


Repeal of McCarran-Ferguson Act — Ramifications for Insurance Clients

January 25, 2021

Jonathan Grossman discusses how the Competitive Health Insurance Reform Act will impact health insurance companies, as they are now no longer immune from antitrust scrutiny for activities previously found to be “the business of insurance.”

COVID-19 and the Risk of Anti-Competitive Employment Practices

May 11, 2020

Jonathan Grossman, Mark Jacobson and Max Kaplan published an article to Corporate Compliance Insights discussing how employers, staffers, and recruiters should be cautious of antitrust enforcement during COVID-19.

COVID-19 and Antitrust? An Announcement from the Department of Justice [Alert]

March 18, 2020

Jonathan Grossman discusses the DOJ's warning against violations of antitrust laws in the manufacturing, distribution, and sale of public health products such as face masks, respirators, and diagnostics.

A Series of Very Unfortunate Events [New York Law Journal]

October 31, 2016

Jonathan Grossman, Thomas Ingalls and Michael de Leeuw, members of Cozen O'Connor's Commercial Litigation department discuss the recent Caledonia matter in the New York Law Journal.

High Court Opens Door To Greater State Role In Energy [Law360]

May 01, 2015

Jonathan Grossman and Thomas Ingalls discuss the U.S. Supreme Court’s decision to uphold a lower court decision that will allow a greater role for state courts in regulating the energy sector.

Events & Seminars

Past Events

Health Law 2024

December 05, 2023 - Philadelphia, PA

Recent Developments in Antitrust Law

October 12, 2022 - Webinar

Health Law 2022

December 08, 2021 - Webinar

Health Law 2021

December 07, 2020 - Webinar

Health Law 2020

December 04, 2019 - Philadelphia, PA

ABA Business Law Section Annual Meeting

September 12, 2019 - Washington D.C.


  • Harvard Law School, J.D., 2000
  • Harvard University, John F. Kennedy School of Government, M.P.P., 2000
  • University of Michigan, B.A., 1992
  • District of Columbia
  • New York
  • U.S. District Court -- District of Columbia