Photo of Margaret T. Segall

Margaret T. Segall

Partner, Cravath

212-474-1231msegall@cravath.com

Two Manhattan West
375 Ninth Avenue
New York, NY 10001

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Maggie Segall is a member of Cravath's Antitrust Practice. Her practice focuses on transactional matters, antitrust regulatory approval, and government investigations, including civil conduct investigations brought by both federal and state antitrust authorities, as well as general antitrust counseling and critical antitrust litigation.

Lawdragon Honors

Honor Year Practice
The 2026 Lawdragon 500 Leading Litigators in America 2026 Antitrust inc. M&A, Litigation
The 2025 Lawdragon 500 Leading Litigators in America 2025 Antitrust inc. M&A, Litigation
The 2025 Lawdragon 500 Leading Global Antitrust & Competition Lawyers 2025 Antitrust inc. M&A, Litigation
The 2024 Lawdragon 500 Leading Litigators in America 2024 Antitrust inc. M&A, Litigation
Lawdragon 500 Leading Litigators in America 2022 Antitrust inc. M&A, Litigation

Segall has represented clients on antitrust issues in connection with numerous proposed or completed deals. These representations include:

  • Flowserve’s proposed $19 billion merger of equals with Chart Industries;
  • PepsiCo’s $1.95 billion acquisition of poppi;
  • Viatris’s divestitures totaling $6.94 billion in value, including the $3.335 billion combination of its biosimilars portfolio with Biocon Biologics and the divestitures of its Over‑the‑Counter, Women’s Healthcare and Active Pharmaceutical Ingredients businesses;
  • Aon plc’s $13 billion acquisition of NFP;
  • Cisco’s $28 billion acquisition of Splunk;
  • Biogen’s $7.3 billion acquisition of Reata Pharmaceuticals;
  • Deutsche Börse AG’s €3.9 billion recommended takeover offer for SimCorp A/S;
  • Altra Industrial’s $5 billion acquisition by Regal Rexnord;

  • RWE AG’s $6.8 billion acquisition of Con Edison Clean Energy Businesses;

  • ADT’s $1.2 billion equity investment from State Farm;

  • Micro Focus’s $6 billion acquisition by OpenText;

  • Global Blood Therapeutics’s $5.4 billion acquisition by Pfizer;

  • Afterpay Limited’s $29 billion acquisition by Block;
  • GW Pharmaceuticals plc’s $7.2 billion acquisition by Jazz Pharmaceuticals plc;
  • National Grid’s £7.8 billion acquisition of Western Power Distribution from PPL and the $3.8 billion sale of Narragansett Electric to PPL;
  • AerCap Holdings N.V.’s $30 billion acquisition of GE Capital Aviation Services and $5.4 billion acquisition of International Lease Finance Corporation;
  • DiaSorin S.p.A.’s $1.8 billion acquisition of Luminex Corporation;
  • Centrica plc’s $3.625 billion divestiture of its North American energy supply, services and trading business (Direct Energy) to NRG Energy;
  • Mylan N.V.’s $50 billion combination with Upjohn, a division of Pfizer, to form Viatris; its $9.9 billion acquisition of Meda; and its $5.6 billion acquisition of Abbott Laboratories’s non‑U.S. developed markets specialty and branded generics business;
  • Occidental Petroleum Corp.’s $57 billion acquisition of Anadarko Petroleum Corp.;
  • US Foods Holding Corp.’s $1.8 billion acquisition of five operating companies of Services Group of America;
  • Pinnacle Foods Inc.’s $10.9 billion acquisition by Conagra Brands, Inc.;
  • Time Warner Inc.’s $109 billion sale to AT&T;
  • DreamWorks Animation SKG, Inc.’s $4.1 billion sale to NBCUniversal, LLC, a division of Comcast Corporation;
  • Anheuser-Busch InBev’s $123 billion acquisition of SABMiller and the $12 billion sale of SABMiller’s U.S. and global Miller-branded businesses to Molson Coors;
  • Alere’s $8 billion acquisition by Abbott Laboratories;
  • H.J. Heinz Company’s $60 billion merger with Kraft Foods Group to create The Kraft Heinz Company;
  • Unilever’s acquisitions of Murad and Dermalogica and its $2.15 billion sale of its North America pasta sauces business under the Ragú and Bertolli brands to Mizkan Group;
  • Integrys Energy Group’s $9.1 billion acquisition by Wisconsin Energy Corporation;
  • InterMune’s $8.9 billion acquisition by Roche;
  • Grupo Modelo’s $20.1 billion acquisition by Anheuser-Busch InBev;
  • Zale Corporation’s $1.4 billion acquisition by Signet Jewelers; and
  • Life Technologies’s $15.8 billion sale to Thermo Fisher Scientific.

In addition, Segall regularly handles civil conduct investigations and complex antitrust litigation. Some of her recent and notable litigations include:

  • Representing Corteva in antitrust litigation brought by the Federal Trade Commission (FTC) and 12 state attorneys general challenging certain of its rebate pricing programs as anticompetitive, as well as more than two dozen related putative class actions, centralized in North Carolina federal court, filed in the wake of the FTC’s complaint.
  • Representing Epic Systems, a large provider of health information technology, in an action filed by Particle Health asserting monopolization, among other claims, arising out of alleged conduct in an alleged market for “payer platforms.”
  • Represented Amgen in successfully defending against an FTC challenge to its $27.8 billion acquisition of Horizon Therapeutics, the largest in Amgen’s history. Segall was part of the team that secured a consent order that ended all litigation and cleared the path for the deal to close. In connection with this victory, the Cravath team was recognized as The Am Law Litigation Daily’s “Litigators of the Week.”
  • Represented Time Warner Inc. in winning the lawsuit filed by the Department of Justice (DOJ) seeking to block Time Warner’s $109 billion sale to AT&T, which culminated in a six‑week trial.