Matt Tabas' practice focuses on federal and state government reviews of mergers and acquisitions, civil antitrust litigation, civil and criminal government investigations, and antitrust counseling. He has represented clients in a number of industries in all phases of merger clearance, including pre-merger business counseling, before the US Department of Justice, Antitrust Division, the Federal Trade Commission (FTC), and state antitrust enforcement authorities, as well as before federal courts in litigated challenges by the government.

Mr. Tabas previously served as a Counsel to the Director in the FTC's Bureau of Competition where he advised two Bureau of Competition Directors on a wide range of antitrust issues. Mr. Tabas also worked as an attorney in the Mergers IV Division of the FTC, investigating and analyzing combinations in the supermarket, healthcare, and funeral home industries. Among other assignments, he led two investigations into mergers of healthcare providers and played an integral role in the trial teams that successfully challenged several high profile mergers, including In re Pinnacle Entertainment, Inc. and Ameristar Casinos, Inc.; FTC v. Whole Foods Market, Inc.; and three of the Federal Trade Commission's hospital merger challenges: FTC v. OSF Healthcare System; FTC v. Phoebe Putney Health System, Inc.; and FTC v. ProMedica Health System, Inc. While at the FTC, Mr. Tabas participated in a staff exchange with Canada's Competition Bureau, where he worked as a Competition Law Officer in the Competition Bureau's Mergers Branch.


  • Fitbit Inc. in its $2.1 billion sale to Google.
  • Bristol Myers Squibb in its $90 billion acquisition of Celgene and the related $13.4 billion divesture of Celgene's OTEZLA® program to Amgen.
  • Kroger in its sale of YouTechnology, its digital coupon and digital rebate publishing unit, to Inmar.
  • NxStage Medical, Inc. in connection with its $2 billion sale to Fresenius Medical Care Holdings, Inc.
  • AT&T Inc. in its successful $85.4 billion stock-and-cash acquisition of Time Warner Inc. After a DOJ investigation and the first vertical merger trial/appeal in decades, the transaction was approved with no finding of liability.
  • BP in its $10.5 billion acquisition of BHP's US shale oil and gas assets.
  • BP in its $155 million acquisition of the upstream portion of Clean Energy's renewable natural gas business and establishment of a longterm supply contract with Clean Energy to support the firm's continuing downstream renewable natural gas business.
  • General Electric in connection with the proposed sale of its appliances business to AB Electrolux, including the DOJ's litigation challenging the transaction.
  • General Electric in connection with the $5.6 billion sale of its appliances business to Qingdao Haier Co., Ltd.
  • Class 1 railroad, serving as co-counsel, in a nationwide class action antitrust lawsuit against major US railroads alleging collusion to fix fuel surcharges on freight shipments. In Re Rail Freight Fuel Surcharge Antitrust Litigation.
  • Koito Manufacturing Co., Ltd. in a multidistrict antitrust litigation involving automotive lamps and HID ballasts.
  • Leading global pharmaceutical manufacturers in antitrust compliance issues.


Understanding the Biden Administration's Potential Impact on Consumer Products
Arnold & Porter Webinar Series
Developments in US Antitrust Litigation—2020 Year in Review
Global Overview (pdf)
Intellectual Property & Antitrust, Lexology
Global Overview (pdf)
Intellectual Property and Antitrust 2021, Lexology
Federal Court Rejects Antitrust Challenge to AbbVie's Humira "Patent Thicket"


Best Lawyers
"Ones to Watch"– Antitrust Law (2021)
Janet D. Steiger Award
Awarded by the Federal Trade Commission (2012, 2013)


  • JD, St. John's University School of Law, 2008
  • AB, Colby College, 2003, cum laude
  • District of Columbia
  • New York
  • US District Court, District of Columbia
  • US District Court, Eastern District of Michigan
Government & Military Service
  • Counsel to the Director, Bureau of Competition, Federal Trade Commission
  • International Exchange Competition Law Officer, Mergers Branch, Competition Bureau, Canada
  • Attorney, Mergers IV, Bureau of Competition, Federal Trade Commission
  • Member, ABA Section of Antitrust Law

  • Associate Editor, ABA Section of Antitrust Law Media & Technology Committee’s e-Bulletin
  • Young Lawyer Representative, Agriculture & Food Committee, ABA Section of Antitrust Law, 2014-2015


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