Marissa Troiano represents clients in connection with antitrust and other complex litigation matters, advisory matters, and mergers and acquisitions. She works with clients across a diverse range of industries, including sports, financial services, consumer products, health care and technology.

Ms. Troiano’s litigation experience includes defending clients in lawsuits involving price fixing, monopolization and other restraints of trade. She represented The Vitol Group in class actions alleging price fixing and market manipulation of North Brent Sea Crude Oil; JP Morgan Chase in antitrust class actions alleging that foreign currency dealers conspired to manipulate benchmark currency exchange rates; Pfizer Inc. in a class action alleging monopolization with respect to the drug Neurontin; Express Scripts, Inc. in a last-minute private antitrust challenge to its $29.1 billion acquisition of Medco Health Solutions, Inc.; CEMEX in a class action relating to alleged price fixing of cement and concrete; and Morgan Stanley in class actions and related investigations alleging bid-rigging relating to municipal derivatives.

Ms. Troiano also has experience representing professional sports leagues and teams on a variety of antitrust and sports law matters. She is representing the National Hockey League (NHL) in lawsuits brought by retired NHL players claiming injuries as a result of concussions and sub-concussive impacts purportedly sustained during their NHL playing careers. She represented the NHL in successfully defeating certification of a consumer class action antitrust lawsuit challenging the league’s exclusive broadcast territories. Ms. Troiano advised the National Collegiate Athletic Association in litigation brought by student-athletes challenging its eligibility rules and the National Basketball Association (NBA) in connection with the league’s imposition of discipline upon Los Angeles Clippers owner Donald Sterling. She also has counseled the NBA, NHL and NFL on various issues related to ticket sales and other antitrust issues.

Ms. Troiano has assisted in representing a number of clients with respect to major transactions, including Pacific Industrial, SGL Carbon, Express Scripts, Energy Solutions, Amerigroup, Rain CII Carbon, Robert Wood Johnson University Hospital and News Corporation.

Ms. Troiano actively works on pro bono matters. Her representations include successfully defending a nonprofit animal shelter in a dog bite litigation and working on not-for-profit mergers. She also is active in Skadden’s diversity and inclusion programs and serves on the Women Attorney Affinity Group’s steering committee.



  • J.D., Columbia Law School, 2009
  • A.B., Princeton University, 2006


  • New York

Marissa E. Troiano

Associate, Antitrust/Competition