Tamar Kaplan-Marans

Tamar Kaplan-Marans focuses her practice on securities litigation and enforcement matters. She regularly represents issuers from a variety of industries in securities litigation. Ms. Kaplan-Marans also has experience with internal investigations and regulatory investigations conducted by the US Securities and Exchange Commission and the Department of Justice. Ms. Kaplan-Marans previously served as a law clerk for the Honorable David Trager and as a judicial intern for Judge Joseph Bianco of the US District Court for the Eastern District of New York.

Ms. Kaplan-Marans also maintains an active pro bono practice. 


  • After extensive briefing and multiple complaint filings, obtained dismissal of securities class action alleging that technology company made false statements and omissions concerning its projections of annual revenue, internal controls and other issues. Lefkowitz et al. v. Synacor, Inc., et al., 2019 WL 3553999 (S.D.N.Y. Aug. 28, 2019).
  • Represented Apollo Education Group in a securities class action lawsuit filed against it based on the University of Phoenix's military recruiting practices and its transition to a new online learning platform. The initial amended complaint was dismissed without prejudice in February, 2017, Lomingkit v. Apollo Education Group, Inc., 2017 WL 3172861 (D. Ariz. 2017), and after repleading, was then dismissed with prejudice, 2017 WL 633148 (D. Ariz. 2017).
  • Represented leading broker-dealer in FINRA arbitration arising out of Puerto Rico municipal bond market crash of 2013. After a two-week trial in which the claimant sought $70 million in damages, secured a final award in the client’s favor, rejecting all claims brought by the claimant. 
  • Successfully tried a lawsuit brought under the Hague Convention on the Civil Aspects of International Child Abduction in the Southern District of New York on behalf of pro bono client and domestic violence victim. Ermini v. Vittori, 2013 WL 1703590 (S.D.N.Y. Apr. 19, 2013).  


  • Honored in 2013 and 2014 with the Above & Beyond Award for Excellence in Pro Bono Advocacy by Sanctuary for Families. 

Insights & News


  • Education

    • JD, Brooklyn Law School, 2009

      cum laude Executive Notes and Comments Editor, Brooklyn Law Review
    • BA, English, Columbia University, 2004

  • Admissions

    • New York

  • Clerkships

    • The Hon. David Trager, US District Court for the Eastern District of New York, 2009 - 2010