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.


Sort By
Weiss, Harry J.

Harry J. Weiss

Chair, Securities Litigation and Enforcement Practice Group

+1 202 663 6993 (t)

Publications & News


July 1, 2015

WilmerHale Named a Leading National Firm in the United States by The Legal 500

The Legal 500 United States has released its annual rankings, selecting WilmerHale as one of the preeminent law firms in the country.

June 11, 2015

WilmerHale Counsel Arian June Elected to Serve on DC Bar Board of Governors

WilmerHale Counsel Arian June has been elected to the DC Bar Board of Governors and will serve a three-year term.

May 26, 2015

Litigating With and at the SEC

An article by Douglas Davison, Matthew Martens, Nicole Rabner, John Valentine and Natalie Rastin, published in The Review of Securities & Commodities Regulation, Vol. 48 No. 9 on May 6, 2015.

May 19, 2015

WilmerHale Practices, Lawyers Ranked Among Nation’s Best by Chambers USA

Chambers USA: America's Leading Lawyers for Business announced its final rankings for the 2015 edition, with WilmerHale ranking among the nation's best in 46 practice area categories. Chambers also ranked 86 WilmerHale attorneys as leaders in their respective fields.

April 28, 2015

SEC Applies Whistleblower Interference Rule to Corporate Confidentiality Requirement

On April 1, the US Securities and Exchange Commission issued—in a settled administrative proceeding—a cease-and-desist order in In the Matter of KBR, Inc., directing that the respondent cease violating Commission Rule 21F-17(a).

April 13, 2015

Report Highlights Bank Vendor Cybersecurity Vulnerabilities

On April 9, the New York State Department of Financial Services released a report on bank vendor cybersecurity that highlights the risk that hackers will use third-party service providers to gain access to bank data.

April 6, 2015

Contribution Caution: Mitigating Risks From Pay-To-Play

An article by Matthew Chambers, Ben Neaderland and April Elliott, published by Law360 on April 6, 2015.

March 18, 2015

SEC Enforcement Developments in 2014, and a Look Forward

An article by Bill McLucas, republished in the Harvard Law School Forum on Corporate Governance and Financial Regulation on March 18, 2015.

March 16, 2015

SDNY Securities and Commodities Fraud Chief to Join WilmerHale

The Chief of the Securities and Commodities Fraud Task Force in the United States Attorney's Office for the Southern District of New York (SDNY), Anjan Sahni, will join WilmerHale in its New York office as a partner in its white collar and securities enforcement practices. Mr. Sahni has overseen some of the most significant white collar and securities fraud prosecutions in recent years.

March 3, 2015

Campaign finance fraud laws still thrive

An article by Timothy Perry, published in the February 19, 2015 edition of the Daily Journal.