Securities Enforcement and Litigation


Arnold & Porter has one of the leading securities enforcement and litigation practices in this complex area of law. Our team is comprised of former US Securities and Exchange Commission (SEC) attorneys, US Department of Justice (DOJ) attorneys, assistant US attorneys, attorneys from other regulatory bodies, and other lawyers who have litigated precedent-setting securities matters. Together, we carry forward a tradition of excellence in securities enforcement and litigation representation that dates to the founding of our practice by one of the authors of the seminal SEC antifraud rule, Rule 10b-5.

Our clients include public companies and their subsidiaries, accounting firms, broker-dealers, investment banks, financial institutions, underwriters, investment advisers, hedge funds, private equity firms, venture capital firms, mutual funds, and law firms. We also regularly represent special committees and audit committees, directors, officers, partners, principals, and employees of such entities. Our experience includes:

  • investigations by the SEC, DOJ, other federal agencies, Congress, self-regulatory organizations (including the Financial Industry Regulatory Authority (FINRA)), and state regulators;
  • securities class actions, shareholder derivative litigation, professional liability lawsuits, cases involving mergers and acquisitions, and other civil and criminal litigation;
  • arbitrations involving customer claims and employee disputes in the securities industry;
  • internal investigations; and
  • proceedings before professional licensing and regulatory authorities, including the Public Company Accounting Oversight Board (PCAOB).

The matters we handle involve claims or charges of fraud, breach of fiduciary duty, mismanagement and negligence, and/or securities or regulatory violations. These issues arise out of allegations involving:

We also provide counseling on disclosure, corporate compliance and governance, D&O insurance, crisis management, and securities and market matters.

A number of our partners have been recognized as leading lawyers in the fields of securities enforcement, securities litigation, and complex business litigation.


U.S. Education Finance Group One William Street Capital Management L.P. v. U.S. Education Loan Trust IV et al.
Representing this sponsor of government guaranteed student loan-backed securitizations in this suit, which has significant implications for securities markets, brought by an institutional investor in those securities claiming that it is owed additional principal and interest payments.
Spirit AeroSystems Holdings Dismissal of securities class action
Secured complete dismissal and victory when the Tenth Circuit affirmed dismissal of a securities class action complaint alleging clients made false and misleading statements that artificially inflated Spirit’s stock price.
Spirit AeroSystems Holdings Securities class action dismissal
Successfully obtained a dismissal with prejudice in a securities class action against our clients alleging they made a number of false and misleading statements that artificially inflated the company’s stock price before the company recorded a $590 million forward loss.
Celestica Inc. Securities class action
Obtained an agreement to settle an eight-year securities class action against this Canadian electronics manufacturing company and its former CEO and CFO for a fraction of the alleged investor losses that plaintiffs sought to recover.
Yelp Securities class actions
Consolidated class actions arising from drop in securities price.


The SEC's Crackdown on Insider Trading by Lawyers
Arnold & Porter Webinar
Tenth Circuit Broadly Interprets Scheme Liability
SEC Data Analysis in Insider Trading Investigations
The CLS Blue Sky Blog
Update: Criminal and Regulatory Enforcement of Market Manipulation Spike
New York Justices Reach Inconsistent Results Post-Cyan on Automatic Discovery Stay


Chambers Latin America
Corporate Crime & Investigations (2015-2020)
The Legal 500 US
Securities Litigation: Defense (2014-2019)
Chambers USA
Securities: Regulation (Nationwide) (2010-2019)

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