Lindsey Champlin counsels US and international companies on a range of antitrust issues, with a particular focus on securing antitrust clearances for all types of M&A transactions.

Drawing on her vast cross-border experience, Ms. Champlin assists leading companies on their most significant antitrust matters. She represents clients doing business in diverse industries, from the energy and automotive sectors to industrial equipment and machinery, advertising, and live entertainment.

Ms. Champlin helps clients secure antitrust approvals from competition authorities around the world, including the US Department of Justice (DOJ), the US Federal Trade Commission (FTC), the Canadian Competition Bureau, Mexico’s Comisión Federal de Competencia Económica, and China’s State Administration for Market Regulation.

In the US, Ms. Champlin regularly handles merger matters through Second Request substantial compliance as well as merger remedy negotiations with the agencies. She represents third parties in FTC and DOJ merger investigations, including through federal court and FTC Part III litigation. Ms. Champlin brings additional experience arbitrating mergers against the DOJ, as well as in handling other FTC and DOJ antitrust investigations, including conduct and consent decree compliance investigations.

Ms. Champlin’s practice extends to a range of other complex antitrust issues, such as competitor collaborations, information sharing, and sales and marketing practices, including price discrimination. She also conducts economic analyses of mergers and other complex antitrust issues.

In addition to her commercial work, Ms. Champlin advises clients on a pro bono basis. Her experience includes representing the Polaris Project, an anti-human trafficking organization, and a tenant association in litigation involving housing code violations in Washington, D.C.

Ms. Champlin regularly writes and presents on topics related to antitrust law, including for law schools, academic journals, and the American Bar Association.

Ms. Champlin serves as a member of W@Competition, an organization for women competition professionals. Additionally, she is a member of Latham's Pro Bono Committee.

Ms. Champlin’s experience includes advising:

  • Agrium in its US$36 billion merger of equals with PotashCorp
  • Avago Technologies in its US$37 billion acquisition of Broadcom
  • Custom Sensors & Technologies  in its US$1 billion sale of its sensing portfolio to Sensata Technologies
  • Energy Transfer LP in its US$7 billion acquisition of Enable Midstream Partners
  • Energy Transfer Partners in its US$18 billion combination with Regency Energy Partners
  • Ensco in its US$850 million acquisition of Atwood Oceanics
  • Entercom Communications in its US$105 million acquisition of Lincoln Financial Media
  • EssilorLuxottica in its US$6 billion acquisition of GrandVision
  • Live Nation Entertainment in extending a consent decree with the DOJ for the company’s merger with Ticketmaster
  • Nissan in its acquisition of a US$2.2 billion controlling stake in Mitsubishi Motors, winning 14 unconditional clearances globally
  • Novelis in its US$2.8 billion acquisition of Aleris, including through the first-ever US merger arbitration
  • NRG in its US$3.6 billion acquisition of Direct Energy
  • Rowan Companies in its US$2.4 billion merger with Ensco
  • Siemens in its US$7.6 billion acquisition of Dresser-Rand
  • Veyance Technologies in its US$1.9 billion acquisition by Continental AG
  • Weatherford in the sale of its US hydraulic fracturing business to Schlumberger
  • Xerium Technologies in its acquisition by Andritz AG

Bar Qualification

  • District of Columbia
  • Virginia


  • JD, George Mason University School of Law, 2011
    magna cum laude
  • BA in Economics, Colgate University, 2008
    magna cum laude