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Michael Diver

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Work Department

Securities Litigation & Enforcement


Michael J. Diver is the head of Katten's Chicago Securities Litigation and Enforcement practice. He represents public companies, financial services firms and other regulated entities, as well as their individual officers and directors, in matters before the Securities and Exchange Commission (SEC) and other regulatory bodies. A former Branch Chief in the Division of Enforcement of the SEC's Chicago Regional Office, Diver's experience covers virtually all areas of capital markets regulatory enforcement. His recent engagements include matters related to securitizations and other structured products transactions, investment adviser and hedge fund activities, broker-dealer sales practices, insider trading, municipal securities transactions, and public company financial reporting and disclosure. He also regularly advises clients in connection with corporate governance matters, shareholder claims, internal investigations, financial restatements, special accounting reviews, SEC regulatory examinations, and Financial Industry Regulatory Authority, Inc. (FINRA) and stock exchange inquiries. Michael has been praised for his ability to "instill confidence that the client is in good hands" and for his "calm and rational" approach (U.S. News – Best Lawyers® "Best Law Firms").

Prior to joining the firm, Michael served as a branch chief in the SEC's Division of Enforcement. In this role, he was responsible for managing a team of enforcement attorneys in investigating and prosecuting violations of the federal securities laws, including cases involving complex financial fraud, market manipulation, insider trading, and violations of broker-dealer, investment adviser and investment company regulations. He prevailed in a number of litigated enforcement proceedings, including a high-profile case involving market manipulation by a registered investment adviser.

Michael writes and lectures regularly on various topics relating to regulatory enforcement and related litigation, including current enforcement trends and priorities, corporate and individual cooperation criteria, whistleblower complaints, insider trading and best practices in defending against regulatory inquiries.


JD, Lewis & Clark Law School; BA, Bucknell University

United States: Dispute resolution

Securities litigation - defense

Within: Next Generation Partners

Michael Diver - Katten

Within: Securities litigation - defense

Katten has a team that is 'extremely responsive and just as knowledgeable'. 'Hands down my number one choice', remarks a client, who praises the firm's 'very pragmatic lawyers who understand business concerns, not just legal ones'. Bruce Vanyo leads the practice from Los Angeles and has 'a well-earned reputation as the godfather of securities litigation defense; his track record backs it up and he is unparalleled in his knowledge'. Among the firm's 'extremely smart attorneys with strong intuition and a strategic mindset' are Chicago-based Michael Diver, LA-based Richard Zelichov ('exceptional, very bright') and Christina Costley and, in New York, Jason Vigna. A highlight for the team was its work in securing the dismissal of four securities class actions consolidated in California on behalf of Natera, in which plaintiffs alleged that the company's IPO offering documents were false and misleading.

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