We defend federal and state securities claims against entities and individuals, and derivative and other claims against corporations and their officers and directors. These claims address areas such as prospectus and other disclosure obligations, restatements, mutual fund trading and marketing, broker-dealer duties to clients and counter-parties, fiduciary duties and insider trading. Many of the over 300 securities class actions that we have defended have been for technology companies (including high-tech, biotech and pharmaceutical companies). We also have substantial experience in representing investment banks, broker-dealers and other securities industry participants, investment advisory and mutual fund companies, life insurance and other financial services firms, REITs, and retailers. In recent matters, our lawyers have:

  • Defended mutual fund advisers in the consolidated Market Timing multidistrict litigation (MDL) proceedings, class and institutional investor claims regarding investment advisor fees, and class actions concerning mutual fund marketing practices
  • Taken a leadership role in the defense of over 300 consolidated securities class actions—the IPO Laddering Litigation—and separately obtained the dismissal of class actions against an underwriter challenging IPO allocations and alleged IPO flipping
  • Represented an investment bank in its successful appeal to the Second Circuit of a $164.5 million jury verdict for losses sustained in a nondiscretionary currency trading account

For more on our securities practice, please see our Securities Department pages.


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Weiss, Harry J.

Harry J. Weiss

Chair, Securities Litigation and Enforcement Practice Group

+1 202 663 6993 (t)

Paine, William H.

William H. Paine


+1 617 526 6134 (t)

Publications & News


March 8, 2018

The #MeToo Movement: The Critical Role of the Board in Preparing for, Responding to and Avoiding Sexual Misconduct Allegations

As the #MeToo movement gains momentum, companies in nearly every major industry are dealing with allegations of gender discrimination, sexual harassment or even sexual assault—including allegations of widespread misconduct and inappropriate behavior within the upper echelons of the corporate structure.

February 23, 2018

Supreme Court Articulates Dodd-Frank Whistleblower Definition in Digital Realty Trust, Inc. v. Somers

On February 21, 2018, the Supreme Court held in Digital Realty Trust, Inc. v. Somers that the anti-retaliation whistleblower protections under the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”) apply only to those who have reported allegations to the Securities and Exchange Commission (“SEC”) as of the time of the allegedly retaliatory conduct.

January 12, 2018

Global Anti-Bribery Year-in-Review: 2017 Developments and Predictions for 2018

This past year, which marked the 40th anniversary of the U.S. Foreign Corrupt Practices Act (“FCPA"), demonstrated that the FCPA continues to be a powerful tool in combating corruption abroad and encouraging compliance at global companies.

December 21, 2017

Law360 Names Matthew Martens a Securities Law MVP

Law360 has recognized Partner Matthew Martens as a leading securities lawyer and honored him as a 2017 MVP. The annual contest recognizes lawyers across various practices that “have distinguished themselves from their peers.”

December 20, 2017

WilmerHale Makes American Lawyer's 2017 Finalist List as a Top Litigation Firm

Recognizing the enormous talent and major recent victories of WilmerHale lawyers, The American Lawyer placed the firm's Litigation/Controversy Department in the small group of finalists for the legal publication's 2017 Litigation Department of the Year contest.

November 29, 2017

DOJ Announces New FCPA Corporate Enforcement Policy

Today, “[d]ue to the unique issues presented in FCPA matters,” Deputy Attorney General Rod Rosenstein announced a new FCPA corporate enforcement policy published in a revision to the United States Attorneys' Manual.

October 27, 2017

WilmerHale Ranks No. 1 on Global Investigations Review's List of Top Investigations Practices

WilmerHale has climbed to the top of Global Investigations Review's list of the world's 30 leading investigations and compliance practices.

October 26, 2017

The Art of Projecting Budgets for Litigation Alternative Fee Arrangements

Timothy Perla and Zack Beasley authored this article, published in Bloomberg Law's Corporate Law & Accountability Report, exploring projecting budgets for litigation alternative fee arrangements.

September 29, 2017

SEC Enforcement Actions Under Exchange Act Rule 21F-17

In this article published by the Journal of Investment Compliance, Thomas White analyzes enforcement actions by the Securities and Exchange Commission (SEC) under Rule 21F-17(a), which prohibits actions to impede whistleblower communications with the SEC.

September 27, 2017

When the Inevitable Happens: When to Self-Report Securities Law Violations and What to Expect When You Do

In this article, published by The Investment Lawyer, Lorraine Echavarria discusses the benefits of self-reporting violations to the Securities and Exchange Commission (SEC); the SEC's treatment of different types of violations after they are self-reported; the practical considerations companies should weigh before self-reporting; and the ways the SEC can encourage more self-reporting in the future.