About Melissa
Melissa MacKewn maintains a substantial securities litigation practice, advising investors, registrants, issuers, officers, directors, underwriters, and public and private corporations. She regularly handles enforcement investigations, settlements, and contested hearings before the OSC and CIRO involving insider trading, disclosure violations, and market manipulation allegations. A former Senior Enforcement Counsel at the OSC, she brings regulatory insight to clients facing high-stakes proceedings. Companies and their audit and special committees also retain her to conduct confidential internal investigations into whistleblower complaints, compliance issues, conflicts of interest, and workplace allegations. Her broader practice includes securities class actions, shareholder and governance disputes, proxy contests, takeover bid litigation, and investment loss claims. She has twice been named Securities Lawyer of the Year by Best Lawyers in Canada.
Practice areas
Education & credentials
- Law school
- University of Western Ontario
Listing compiled from public sources. Verify licence status on the Law Society of Ontario directory.