Grant Petrosyan

Grant Petrosyan is an associate in the New York office of Constantine Cannon. His practice is focused on antitrust litigation and counseling, and commercial litigation in both state and federal courts. Grant is also active in the firm’s e-discovery practice.

Since joining the firm in 2015, Grant has represented clients across various industries including payments, health care, aviation, and retail. He has experience in both plaintiff- and defense-side antitrust and commercial matters.

Grant’s recent litigation experience includes:

  • Representation of 65 of the largest retailers in an antitrust case against payment card networks and banks;
  • Representation of a Japanese airline in a price-fixing antitrust matter;
  • Representation of a putative class against a large hospital system concerning tying arrangements and anti-steering provisions;
  • Representation of three whistleblowers in a federal False Claims Act case alleging a military defense contractor violated international sanctions; and
  • Representation of the State of New York in several lawsuits in federal and state courts challenging certain regulations promulgated by the New York State Department of Health.

Grant graduated from Brooklyn Law School in 2014 and received a degree in Economics from Fordham University in 2011. During law school, he interned at the Federal Trade Commission and completed two judicial internships at the Kings County Supreme Court in New York and the Bergen County Superior Court in New Jersey.

Grant is admitted to practice in New York and New Jersey. He is a member of the American Bar Association, the Federal Bar Council, and the Armenian Bar Association,  where he is Co-Chair of the Young Lawyers Committee.

Grant has published the following articles:

  • Will Apple’s Crackdown on Third-Party Apps Continue With iOS 13?, Antitrust Today, May 16, 2019
  • The Airbus and Boeing Duopoly, Competition Policy Journal, April 23, 2019
  • NCAA May Have Lost Antitrust Case to Student Athletes, But How Much Did It Really Lose?, Concurrences, March 21, 2019
  • DOJ Clarifies How it Analyzes No-Poach Agreements, Antitrust Today, March 15, 2019
  • NCAA May Have Lost Antitrust Case to Student-Athletes, But How Much Did It Really Lose?, Antitrust Today, March 13, 2019




J.D., Brooklyn Law School, 2014

B.A., Fordham University, Economics, 2011

Grant Petrosyan's Publications & Speeches

The Airbus and Boeing Duopoly

Grant Petrosyan published in Competition Policy International.  Click here to read the article.

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NCAA May Have Lost Antirust Case to Student-Athletes, But How Much Did It Really Lose?

Concurrences publishes article by Grant Petrosyan. Click here to read the article.

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Antitrust Merger Remedies Should Address Potential Ills

Law360 publishes article by partners Matthew Cantor and Ankur Kapoor.  Click here to read the article.

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