Arthur Luk represents corporations; directors, officers, and executives; and "Big 4" accounting firms and individual auditors in investigations conducted by the US Department of Justice (DOJ), US Securities and Exchange Commission (SEC), and Public Company Accounting Oversight Board (PCAOB) into alleged violations of the US securities laws, the Foreign Corrupt Practices Act (FCPA), and the Food, Drug, and Cosmetic Act. He also has extensive experience with securities class actions, shareholder derivative suits, and complex commercial litigation in federal and state courts, including putative class actions arising out of data breaches. His clients operate worldwide in a number of industries, including banking and finance, consumer products, pharmaceuticals, private equity, real estate, and telecommunications.


  • Counsel for accounting firms and individual auditors in numerous SEC and PCAOB investigations, including in a contested PCAOB disciplinary proceeding.
  • Counsel for companies in DOJ and SEC investigations regarding compliance with the FCPA.
  • Counsel for companies, executives, and other employees in DOJ investigations regarding possible off-label promotion of pharmaceuticals.


Securities Litigation Exposure for Life Science Companies
Arnold & Porter Webinar
Securities Enforcement and Disputes and the Life Sciences Industry
Arnold & Porter Seminar
Arnold & Porter Discusses Growing Cybersecurity Oversight by SEC and Shareholders
The CLS Blue Sky Blog
SEC, Shareholders Take On a Growing Cybersecurity Oversight Role
Global Anti-Corruption Insights: Winter 2018
Update on Recent Enforcement, Litigation, and Compliance Developments


The Legal 500 US
"Next Generation Lawyer" – Securities Litigation: Defense (2017-2018)
Minority Corporate Counsel Association (MCCA)
"Rising Star" (2016)


  • JD, Columbia Law School, 2003, Harlan Fiske Stone Scholar
  • BA, Johns Hopkins University, 2000, Phi Beta Kappa
  • District of Columbia
  • New York
  • Fellow, Leadership Council on Legal Diversity (LCLD)

  • Member, American Bar Association, Section of Litigation, Professional Liability Litigation Committee


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