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ProfessionalsDaniel S. Sinnreich

Daniel S. Sinnreich

Tel: +1-212-373-3394
Fax: +1-212-492-0394

New York

1285 Avenue of the Americas
New York, NY 1001-6064
Fax: +1-212-492-0394

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A counsel in the Litigation Department, Dan Sinnreich specializes in securities litigation and enforcement matters. He represents corporate and individual clients in a wide range of securities class actions and shareholder derivative lawsuits, as well as civil and criminal investigations by the Securities and Exchange Commission, the United States Attorney’s Office, and other federal and state agencies.


Dan has represented high-profile clients in finance, banking, information technology and consumer goods, among other industries, in both federal and state trial and appellate courts. Dan’s experience includes:

  • Amazon in litigation regarding its alleged improper use of third-party sellers’ data.
  • Bank of New York Mellon in the dismissal of a high-stakes investor class action filed in the wake of a pyramid scheme involving purported cryptocurrency OneCoin.
  • Biogen Inc., and certain current and former executives, in a class action alleging that Biogen made false and misleading statements about its Alzheimer’s drug aducanumab during the FDA approval process.
  • Carnival Corp., the world’s largest cruise operator, and Carnival’s CEO, in obtaining the dismissal of a securities fraud class action in Florida federal court alleging that defendants made material misstatements and omissions concerning the risks posed to Carnival by COVID-19, and about the company’s commitments to regulatory compliance and health and safety.
  • The eight underwriters in the dismissal of an action brought in the New York State Supreme Court under the Securities Act of 1933 in connection with the IPO of Chinese social audio platform Lizhi, Inc.
  • PayPal, in the dismissal of a securities class action regarding the company’s regulatory compliance.
  • Snap, Inc. and several of its directors and executives in the defense of a securities class action and related shareholder derivative actions brought by investors alleging false and misleading statements about Snap’s preparation for the rollout by Apple of new privacy changes and their impact on prospective advertising revenue.
  • Steven A. Cohen and SAC Capital (now Point72 Asset Management), in civil and regulatory matters alleging insider trading, including class action litigation filed by a class of contemporaneous traders alleging insider trading in the securities of Elan and Wyeth.

Dan plays a significant role in managing the firm’s securities litigation practice by speaking in podcasts and writing extensively about the securities laws, including for publications such as Law360. He also maintains an active pro bono practice where he has litigated high profile public impact cases before the United States Supreme Court and several federal and state courts of appeals, and conducted numerous evidentiary hearings and oral arguments on behalf of indigent clients in New York State Court and before administrative law judges.

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