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ProfessionalsBrette Tannenbaum

Brette Tannenbaum

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

New York

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

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A partner in the Litigation Department, Brette Tannenbaum represents clients in a broad range of complex commercial litigation matters, with particular focus on antitrust, unfair competition, securities, and other investment management litigation. She has significant experience litigating cases in state and federal courts at both the trial and appellate levels, as well as before arbitration tribunals.


Significant representations include:

  • The Blackstone Group and its hedge fund division in a multi-billion dollar derivative lawsuit brought by beneficiaries of the Kentucky Retirement Systems alleging breach of trust and fiduciary duties;
  • General Electric in a billion dollar trade secrets misappropriation lawsuit against a direct competitor in the gas turbine industry;
  • News Corporation and certain subsidiaries in a putative class action and competitor lawsuits involving claims of exclusive dealing and monopolization, one of which Brette tried successfully to a jury in the Southern District of New York, 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 multiple antitrust class action litigations, including the so-called “interchange” multidistrict litigation brought by putative classes of U.S. merchants and related opt-out actions brought by nearly 100 of the largest merchants in the U.S., challenging payment card “interchange” fees and certain rules governing merchants’ acceptance of payment cards, as well as class action litigation brought by U.S. merchants alleging that major payments networks, together with card-issuing banks, conspired to shift fraud costs for certain card transactions from the issuing banks onto merchants in connection with the roll-out of EMV-chip cards in the U.S.;
  • Investment Technology Group, Inc. in the favorable resolution of a FINRA arbitration brought by a former employee who claimed that the company had disparaged him and tortiously interfered with his business relationships;
  • A major investment firm in the litigation and favorable resolution of multiple employment discrimination actions brought by former employees;
  • 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;
  • 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.

The New York Law Journal named Brette a "Rising Star" in its 2021 New York Legal Awards. In 2020 and 2021, Brette was recognized by Benchmark Litigation on its “40 and Under Hot List.” 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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