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ProfessionalsBrette Tannenbaum

Brette Tannenbaum

Tel: +1-212-373-3852
Fax: +1-212-492-0852

Tel: +1-212-373-3852
New York

1285 Avenue of the Americas
New York, NY 10019-6064
Fax: +1-212-492-0852

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Bar Admissions 

A partner in the Litigation Department, Brette serves as Co-Chair of the Investment Management Litigation Practice Group and Deputy Co-Chair of the Antitrust Practice Group. She represents clients in a broad range of complex commercial disputes, with particular focus on litigation involving investment advisors and their portfolio companies, as well as antitrust and unfair competition litigation.


Brette’s significant representations include:

  • Blackstone and its hedge fund division in the successful appeal in the Kentucky Court of Appeals of an adverse decision in Kentucky state court in a ground-breaking $50 billion derivative claim alleging that Blackstone and other hedge funds unlawfully encouraged the plaintiff pension fund to invest in supposedly unduly risky funds of hedge funds while the state fund’s financial condition was deteriorating;
  • General Electric in a billion dollar trade secrets misappropriation lawsuit against a direct competitor in the gas turbine industry;
  • The Ultimate Fighting Championship in a high-profile antitrust class action involving monopsony and exclusive dealing claims brought by a class of 1,200 former mixed martial artists;
  • News Corporation and certain subsidiaries in the favorable resolution of multiple antitrust litigations, including class action and competitor lawsuits involving claims of exclusive dealing and monopolization, as well as the dismissal of unlawful bundling and tying claims following an evidentiary hearing before a panel of antitrust expert special masters;
  • Mastercard in several of the largest antitrust litigations nationally, including successfully defending a $5.6 billion settlement in a massive class action regarding the fees and rules governing merchants’ acceptance of payment cards;
  • The National Football League and six of its teams in a putative class action alleging racial discrimination in the hiring and retention of head coaches and senior executives;
  • Major League Baseball in a putative antitrust class action involving the sale of MLB licensed products in third-party online marketplaces; 
  • The Philadelphia 76ers in an internal investigation relating to the use of certain anonymous Twitter accounts to post information concerning the club, its personnel and related topics;
  • Wafra Inc. in a variety of matters, including the favorable resolution of multiple employment discrimination actions brought by former employees;
  • Chip Wilson, the founder and former CEO of lululemon athletica, in the dismissal of securities fraud class action and derivative litigation concerning disclosures of product recalls.

Brette earned her A.B. from Princeton University, with honors, and her J.D. from Columbia Law School, where she was a James Kent Scholar and notes editor of the Columbia Law Review.

Brette was most recently recognized as a “Lawyer of the Year – Under 40” finalist by the Global Competition Review.  In 2023, she was named an “Up and Coming” lawyer by Chambers in the Litigation: General Commercial (NY) category and as a Law360 “Rising Star” for Sports & Betting.  Benchmark Litigation recognized Brette on its “40 and Under Hot List” in 2020, 2021, and 2022, most recently calling her an “emerging talent in antitrust litigation.”  The New York Law Journal named Brette a “Rising Star” in its 2021 New York Legal Awards.  Brette is a member of the New York State Bar Association’s Antitrust Law Section and the Federal Bar Council First Decades Committee.  She also serves on the Board of Trustees of the Randall’s Island Park Alliance.

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