David MacIsaac

David MacIsaac is Of Counsel in the White Plains Office. His practice focuses on investigating, analyzing and prosecuting direct and derivative breach of fiduciary duty actions on behalf of stockholders.  He is currently actively pursuing confidential books and records requests on behalf of institutional and individual clients.

For nearly a decade, David has built a track record of success in the Delaware Chancery Court.  He has successfully developed and prosecuted numerous high-profile actions against boards of directors and officers for breaches of fiduciary duty, including but not limited to:
 

• Nantahala Capital Partners L.P. v. QAD Inc., et al. (direct action; enjoining merger on basis of inadequate disclosures; settled for $65 million)
• Macomb County Employees’ Retirement System v. Kenneth McBride, et al. (Stamps.com) (derivative action; settled for $30 million plus corporate governance reforms)
• In re Versum Materials, Inc. Stockholder Litigation (direct action; resulted in revocation of poison pill)
• In re Pattern Energy Group Inc. Stockholder Litigation (direct action; successful challenge to $6.1 billion merger transaction; settled for $100 million)
• Ontario Provincial Council of Carpenters’ Pension Trust Fund, et al. v. Walton, et al. (Walmart Inc.) (derivative action arising from the opioid crisis) 
• In re McKesson Corporation Derivative Litigation (derivative action arising from the opioid crisis; settled for $175 million plus corporate governance reforms)
• City of Monroe Employees’ Retirement System v. Rupert Murdoch et al. (derivative action arising from sexual harassment at Fox News; settled for $90 million plus corporate governance reforms)
• In re Yahoo, Inc. Derivative Litigation (derivative action arising from the largest data breach in U.S. history; settled for $29 million)

Prior to joining the plaintiffs’ bar, David served as an Associate at a prominent global law firm, where he litigated a wide array of complex matters.