Sean Prosser is a litigator who advises and defends clients facing shareholder litigation and criminal and civil government investigations. He has extensive experience in U.S. Securities and Exchange Commission (SEC) and U.S. Department of Justice (DOJ) proceedings, shareholder class actions, and derivative and corporate control lawsuits.
Sean is a former SEC enforcement attorney whose private practice now includes representation of companies, chief executives, directors and officers, broker-dealers, hedge funds, committees, accounting firms and public officials. He has a significant securities litigation practice, within and outside of the regulatory context, with particular depth in California and Delaware-based actions. Sean also manages internal investigations, inquiries and enforcement proceedings initiated by regulatory authorities, including:
- U.S. Securities and Exchange Commission (SEC)
- Financial Industry Regulatory Authority (FINRA)
- NYSE, Nasdaq and other exchanges
- California Department of Corporations
- U.S. Department of Justice (DOJ)
- Internal Revenue Service (IRS)
- U.S. Department of the Treasury
- Public Company Accounting Oversight Board (PCAOB)
On the shareholder litigation front, Sean has represented the following companies over the course of his career: American Pacific Corp.; AML Communications; Ascend Communications; Cogent; Comps.com; Digital Lightwave; dj Orthopedics; Dura Pharmaceuticals; EEX Corp.; Gemstar-TV Guide International; Goya Foods; Kintera; Kratos Defense & Securities Solutions; Ligand Pharmaceuticals; Mentor Corp.; Netlist; NetSol Technologies; Mallinckrodt plc; Pepperball Technologies; Schlotzky’s; SoftBank Corp.; Steakhouse Partners; Unison Healthcare; Wireless Facilities; and others. Sean’s vast industry experience includes advising and working with clients in financial services, technology, software, medical devices, pharmaceuticals, biotechnology and consumer products.
Sean Prosser is recognized by Legal 500 (US) for his expertise in Merger Litigation, and by Best Lawyers in America (2010-2017) for his expertise in Securities Litigation, Mergers & Acquisitions Litigation, SEC Enforcement Litigation, and Corporate Compliance & Corporate Governance Law. He also was named Best Lawyers' 2016 San Diego Corporate Governance Law "Lawyer of the Year." Mr. Prosser also is listed in San Diego SuperLawyers 2010-2017.
Mr. Prosser is a member of the Board of Editors for the Corporate Counselor and a member of the Association for Securities and Exchange Commission Alumni (ASECA). He is also a member of the California Bar Association and the San Diego Bar Association. He is admitted to practice in California, before the U.S. District Courts for the Central and Southern Districts of California, and before the U.S. Court of Appeal for the Ninth Circuit.