Shari Ross Lahlou

Shari-Ross, Lahlou

Shari Ross Lahlou


Washington, D.C. | 1900 K Street, NW, Washington, DC, United States of America 20006-1110
+1 202 261 7923 | +1 202 261 3333


Shari Ross Lahlou is an experienced trial lawyer who focuses her practice on antitrust and complex litigation matters. Her clients include Fortune 500 companies from the tech, healthcare and chemicals industries. In addition to providing legal counsel on a variety of antitrust issues, Ms. Lahlou has obtained trial court and appellate victories for her clients across a range of antitrust matters, including: cartels, monopolization, tying, exclusive dealing and other anticompetitive conduct. 

Ms. Lahlou is recognized as a leading litigation lawyer, having been named Global Competition Review's 2018 “Litigator of the Year” and a 2016 National Law Journal “M&A-Antitrust Trailblazer.” 

Prior to joining Dechert, Ms. Lahlou was a partner at another global law firm.

  • Dickinson College, B.A., cum laude
  • The George Washington University Law School, J.D., Order of the Coif, with highest honors
  • District of Columbia
  • Maryland
  • CSX Transportation in the defense of Sherman Act Section 1 multidistrict class action litigation alleging conspiracy to fix fuel surcharge prices. Prevailed in defeating class certification on remand from the D.C. Circuit’s prior opinion vacating the district court’s previous ruling certifying the class.
  • Marriott in a class action antitrust lawsuit against the major hotel companies alleging the companies engaged in a conspiracy regarding keyword advertising.
  • Humana in antitrust litigation regarding allergy testing and allergen immunotherapy.
  • AT&T as antitrust counsel in its proposed US$85 billion acquisition of Time Warner.
  • Chemours (and legacy entity DuPont) in defense of Sherman Act Section 1 class action litigation alleging conspiracy to fix the price of titanium dioxide. Prevailed in federal district court on summary judgment in an opt-out case brought by Valspar; summary judgment affirmed by the Third Circuit.
  • Owens & Minor, the nation’s leading distributor of medical and surgical products, in litigation alleging tying and exclusive dealing. Prevailed in federal district court on summary judgment, which was affirmed by the Tenth Circuit.
  • Humana as lead trial counsel in connection with the U.S. Department of Justice’s challenge of the company’s proposed merger with Aetna, valued at approximately US$39 billion.
  • AT&T in its proposed acquisition of T-Mobile.
  • AT&T in litigation over exclusive service provider relationship for iPhones.
  • A major copier company in a case alleging violations of Sherman Act Section 2 using an aftermarket theory, and RICO.
  • DuPont in its prosecution of trade secrets claims and its defense of a Sherman Act Section 2 counterclaim.

Includes matters handled at Dechert or prior to joining the firm.