Michael J. Diver

Chicago Office
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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.

Shown below is a selection of Michael’s engagements.


Legal 500, 2015–2017

BTI Client Service All-Star

BTI Client Service All-Star, 2014
Super Lawyers, 2017
October 27–28, 2015
Speaker | PLI Understanding the Securities Laws | Chicago, Illinois
June 9, 2015
Speaker | PLI Internal Investigations 2015 | Chicago, Illinois
June 10, 2014
Speaker | PLI Internal Investigations 2014 | Chicago, Illinois
October 24–25, 2013
Speaker | PLI Understanding the Securities Laws | Chicago, Illinois
June 1, 2012
Critical Steps in Handling an SEC Investigation | NYSE Corporate Board Member Webinar | Webinar
April 1, 2012
Presenter | Insider Trading Compliance: Mitigating Risk in an Era of Heightened Scrutiny | Webinar


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

Bar Admissions

  • Illinois

Court Admissions

  • US District Court, Northern District of Illinois



BTI Client Service All-Star

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