Marisa Antonelli

Partner

Commercial & Business Litigation

“Marisa combines deep knowledge with exceptional organizational skills and a proactive approach, ensuring that matters run smoothly and efficiently. Beyond her technical abilities, she is a pleasure to work with – responsive, thoughtful and always focused on delivering practical solutions that meet our needs.” – Chambers USA 2026

Marisa Antonelli of Vinson and Elkins New York

Overview

Marisa is an experienced and versatile litigator who counsels companies and individuals in connection with a wide range of high-stakes disputes, including securities litigation, commercial contract disputes, shareholder activism and corporate governance matters. Marisa handles litigation in New York state and federal courts, as well as in trial and appellate courts across the country. She also represents public and private companies, as well as board committees, in internal investigations, including in response to investigations by the SEC and other authorities. Marisa has experience working with clients in a broad range of industries, including the private equity, finance and banking, technology, food service, sports, and entertainment sectors.

Experience

  • Obtained complete dismissal of putative class action securities fraud claims against media measurement and analytics company following motion to dismiss

  • Obtained complete dismissal of putative class action fraud and consumer protection claims on behalf of professional sports team following motion to dismiss, including affirmance by the U.S. Court of Appeals for the Second Circuit

  • Obtained summary judgment on behalf of financial firm, including affirmance by U.S. Court of Appeals for the Second Circuit, resulting in dismissal of fraudulent transfer claims brought by bankruptcy trustee

  • Obtained complete dismissal of securities claims in connection with contested director elections following motion to dismiss; appeal pending before the U.S. Court of Appeals for the First Circuit

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Credentials

Education

  • Fordham University School of Law, J.D. magna cum laude, 2009 (Fordham Urban Law Journal)
  • University of Rochester, B.A., Political Science and Religion cum laude, 2004

Admissions

  • New York
  • United States District Courts for the Southern District of New York, Western District of New York, Northern District of New York and Eastern District of New York
  • United States Court of Appeals for the First Circuit
  • United States Court of Appeals for the Second Circuit
  • United States Court of Appeals for the Ninth Circuit
  • U.S. Supreme Court

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Recognitions

  • Chambers USA, Litigation: Securities (New York), 2026
  • Legal 500 U.S., Securities Litigation: Defense, 2026
Insights

Client Alerts

Delaware Court of Chancery Dismisses Fiduciary Duty and Control Group Claims Challenging KnowBe4’s $4.6 Billion Take-Private by Vista Equity Partners

On May 27, 2026, Chancellor Kathaleen McCormick of the Delaware Court of Chancery issued a memorandum opinion in Le Clair …

June 23, 2026

June 23, 2026 • 10-minute read

Client Alerts

Supreme Court Holds Investment Company Act Section 47(b) Does Not Create a Private Right of Action

On June 11, 2026, the Supreme Court issued its opinion in FS Credit Opportunities Corp. v. Saba Capital Master Fund, …

June 17, 2026

June 17, 2026 • 5-minute read

Client Alerts

Supreme Court Rejects Financial Harm Requirement for SEC Disgorgement

On June 4, 2026, the U.S. Supreme Court rejected an attempt to limit the ability of the U.S. Securities and …

June 9, 2026

June 9, 2026 • 3-minute read

Client Alerts

Silence No More, But Speak with Care: SEC Rescinds the “No-Deny” Settlement Policy

On May 18, 2026, the U.S. Securities and Exchange Commission (“SEC” or the “Commission”) announced that it had rescinded Rule …

May 27, 2026

May 27, 2026 • 5-minute read

Client Alerts

Prediction Markets Developments: State Regulators and the CFTC Await Appellate Rulings That Will Define Their Enforcement Roles

Prediction markets—markets on which participants trade contracts whose outcomes depend on the outcome of an event—have experienced staggering growth since …

March 27, 2026

March 27, 2026 • 6-minute read

News & Achievements