Luke Cadigan
About Luke
Luke is head of business litigation for Boston and partner in charge of Cooley’s Boston office. He is an experienced trial attorney, having conducted multiple trials in federal and state court, as well as various administrative and arbitration forums. Luke concentrates his practice on securities enforcement matters, internal investigations, complex commercial litigation, shareholder disputes and class actions, corporate governance issues, and regulatory compliance. He has been recognized by Chambers USA for both securities litigation and white-collar crime and government investigations.
Luke is a former assistant director in the Enforcement Division of the US Securities and Exchange Commission (SEC). He managed investigations conducted by staff attorneys and accountants, including matters related to accounting fraud, offering fraud, insider trading, whistleblower complaints, investment advisers and broker-dealers. Luke also oversaw investigations into potential Foreign Corrupt Practices Act (FCPA) violations and, while serving as a member of the agency’s Cross-Border Working Group, he supervised investigations into the accounting practices of Chinese and other non-US companies trading on US markets.
Before becoming an assistant director, Luke spent more than seven years as SEC senior trial counsel, investigating and litigating dozens of high-profile matters. As lead counsel, he also successfully tried several complex matters in federal court and in the SEC’s administrative forum.
Passions
Family
Boston sports
Literature
Admissions and credentials
- Massachusetts
- District of Columbia
Rankings and accolades
Securities Docket: “Enforcement Elite” (2025)
Chambers USA: Litigation: White-Collar Crime & Government Investigations – Massachusetts (2024 – 2025)
Chambers USA: Litigation: Securities – Massachusetts (2022 – 2025)
Best Lawyers – Leading Lawyer in Litigation Securities
The Legal 500 US: General Commercial Disputes (2024 – 2025)
Massachusetts Super Lawyer
Memberships and affiliations
- American Bar Association (ABA)
- Boston Bar Association’s Executive Committee and Council
Recent Blog Postings
Early SEC Enforcement Trends from Chairman Gary Gensler’s First 100 Days
Luke is very knowledgeable, always prepared and insightful.
A fantastic lawyer who is very familiar with the law and the SEC's enforcement practices.
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