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)

Publications & News


September 25, 2015

WilmerHale's Investigations Practice Ranks Second in GIR's "Top 30" Inaugural Listing

WilmerHale's investigations practice is named at the top of Global Investigations Review's inaugural listing of the 30 leading global investigations and compliance practices.

September 17, 2015

Diversity Journal Recognizes Two Partners Among Women Worth Watching

Partners Elizabeth Mitchell and Heather Zachary have been named to Diversity Journal's annual list of Women Worth Watching, which recognizes professional women for their passion, potential and positive influence both inside and outside the workplace.

September 15, 2015

Second Circuit Allows Whistleblower Retaliation Protection Without Reporting to SEC

In a 2-1 decision in Berman v. Neo@Ogilvy LLC, the US Court of Appeals for the Second Circuit ruled that whistleblowers who report securities law violations internally but not to the US Securities and Exchange Commission are protected under the Dodd-Frank Act from employer retaliation.

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.