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Zach Deaton


Zach's current practice focuses on antitrust, securities, and white collar litigation, as well as government and internal investigations, and regulatory compliance.

Zach has represented corporate clients in cases in federal and state courts in connection with securities and antitrust class actions and has represented individual clients in federal court in insider trading enforcement actions.

Zach also has experience representing and advising clients in connection with investigations by the United States Department of Justice, Securities and Exchange Commission, and other regulators.

Zach is actively involved in pro bono work. He has successfully represented clients in asylum proceedings in Immigration Court and assisted clients in obtaining their release from detention by Immigration and Customs Enforcement. Zach also contributes to the firm's Need-to-Know Litigation Weekly regarding M&A and Corporate Governance.



Representative matters

Representation of underwriters, including clients such as Bank of America, Citigroup, Goldman Sachs, Merrill Lynch, Credit Suisse and others in separate securities class actions arising out of recent stock offerings of companies such as Adeptus, Alnylam, Arconic, and Evoqua.

Representation of several major financial institutions in separate antitrust class actions or inquiries related to SSA bonds, European government bonds, GSE bonds, stock loan transaction, LIBOR, and CDOR.

Representation of major financial institution in connection with investigations by federal regulatory authorities.

Representation of individual clients in criminal and civil insider trading enforcement actions by the United States Department of Justice and Securities and Exchange Commission.

Published Work

  • "Eighth Circuit Affirms Dismissal of Merger-Related Derivative Suit for Failure to Plead Demand Excusal," The M&A Lawyer, May 2022



Attorney-at-Law, New York


University of Texas School of Law J.D.

University of Oklahoma B.A. in Economics

A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.