Colin Kass

Proskauer (Washington)
Lawyer (Partner)

Colin Kass is a partner in the Litigation Department at Proskauer Rose, and co-chair of the Firm’s Antitrust Practice Group. Colin is a trial lawyer and litigates antitrust cases before federal and state courts and agencies throughout the United States. His practice involves a wide range of industries and spans the full-range of antitrust and unfair competition-related litigation, including class actions, competitor suits, dealer/distributor termination suits, price discrimination cases, criminal price-fixing investigations, and merger injunctions. Colin also has extensive experience dealing with the Federal Trade Commission and Department of Justice in obtaining clearance for competitively-sensitive transactions and handling anticompetitive practices investigations. His practice also includes counseling clients on their sales, distribution, and marketing practices, strategic ventures, and general antitrust compliance.


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Squire Patton Boggs (Washington)
Proskauer (Washington)
Proskauer (Washington)
Proskauer (New York)
Proskauer (Washington)
Proskauer (London)


243 Bulletin

Stephen Chuk, Jade-Alexandra Fearns, Colin Kass The US DoJ announces its intention to continue to hold businesses accountable for per se criminal violations of antitrust laws during the COVID-19 situation


As businesses across the globe grapple with the changing realities presented by the COVID-19 pandemic, U.S. and international antitrust enforcers have warned that business should continue to mind the antitrust laws. Global enforcers are also focusing on the role competition laws play as (...)

Alicia J. Batts, Christopher E. Ondeck, Colin Kass, David Munkittrick, John R. Ingrassia The U.S. District Court for the Northern District of Ohio denies the FTC bid for a preliminary injunction in a merger case (Steris / Synergy)


This article has been nominated for the 2016 Antitrust Writing Awards. Click here to learn more about the Antitrust Writing Awards. "Prophesy is a good line of business, but it is full of risks." Mark Twain could have been speaking about the FTC’s recent challenge to a merger between the (...)

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